Roco Rescue

RescueTalk

WE DO RESCUE

Do’s & Don’ts for CS Attendants (Hole Watch)

Thursday, October 19, 2017

There continues to be a misconception that a confined space attendant (or “hole watch”) is a menial task to be assigned to the greenest, most inexperienced personnel on the job. That’s a dangerous assumption, and it has been a contributing factor in many confined space fatalities.

In fact, the attendant or hole watch should have a solid understanding of the permit space to be entered. This includes knowing the particulars of any known or potential hazards as well as other pertinent knowledge and skill sets. If you are assigned this crucial role, I hope you understand that the entrant(s) are relying on you. Your performance may have a significant bearing on the outcome, both good and bad.

Do you know everything you need to know in order to perform your duties as a confined space attendant? Don’t assume that you will learn everything you need to know after a two- or three-minute pre-job briefing.

Being an attendant or "hole watch" is a critically important role and failure to properly perform these duties has led to multiple fatalities – both for the entrants and the attendants themselves.

Do understand the known and potential hazards of the confined space. Do take the time to review the SDS (MSDS) for any and all materials or gasses that may be encountered. Do learn what the signs and symptoms of exposure may be. Then, if you detect any of them in the entrant’s behavior or appearance, you can order immediate evacuation.

Don’t gloss over this valuable and readily accessible information only to wonder what caused the entrant(s) to lose consciousness. The SDS (MSDS) provides information on route of exposure; and very importantly, the signs and symptoms of exposure. Don’t miss the opportunity to save the day, and perhaps a life, by learning these early warning signs. This allows evacuation of the space before entrants are no longer able to do so on their own.

Do learn the proper operation of any testing equipment, such as atmospheric monitors. It is also important to understand the limitations of this equipment as well.

Do keep track of all authorized entrants in the space. For entries with multiple entrants, don’t rely on your memory alone. Do use some sort of log or entry roster as a reliable means to accurately identify who is in the space.

Do make sure that you have a reliable means to communicate with the entrants. Do test that means of communication at the very limits of the space to ensure it works. Don’t wait until there is an incident to learn that you cannot alert the entrants, or you cannot hear that their status has changed. If you haven’t heard from the entrants in a while, it can be tempting to go into the space to check on them. This very situation has led to many fatalities in which the attendant was overcome by the same hazard as the authorized entrant(s). At that point, there is no longer anyone available to call for help.

Don’t accept the job assignment until you have been briefed by the entry supervisor on all the planned activities both inside and outside the space. Do remember that oftentimes activities outside the space can create a hazard for the entrants inside the space. Carbon monoxide and spills of hazardous materials are just a couple of examples.

Don’t allow any activities to take place inside or outside the space that are prohibited and are not consistent with the conditions stated on the entry permit, especially if they may create a hazard to the entrants. If those activities were not coordinated and told to you by the entry supervisor, do evacuate the space and call the entry supervisor for guidance.

Don’t leave the space or perform other duties that may interfere with your primary duty of monitoring and protecting the entrants.

Do remain diligent, remember that you are the critical link between the entrants and the rescue service.

Do know how to contact rescue services should they be needed. Don’t wait until it is too late to call for help. Do summons rescue as soon as you determine that the entrants may need assistance escaping from the space. Just remember, you can’t turn back the clock and buy back the time that entrants may have needed to survive. It’s a whole lot easier to turn around the rescue service if it is not needed.

Don’t allow unauthorized persons to approach or enter the permit space. If you are unable to warn them away, do order the evacuation of the authorized entrants. Do immediately inform the entry supervisor of the situation.

Do perform non-entry rescue (retrieval) when needed and if authorized by your employer. Do perform a thorough pre-entry inspection on the retrieval rescue equipment. Do make sure it is appropriate for the type of rescue that may be needed. Do learn and practice the proper operation of the retrieval equipment. Don’t wait until there is an emergency to try and figure it out. Don’t attempt entry rescue unless you are authorized, trained and equipped to do so. Don’t attempt entry rescue until you are relieved by another authorized attendant. Remember, you cannot leave the space unattended!

Don’t take your responsibilities lightly. Do ask the right questions of the entry supervisor and your authorized entrants. Do realize that they are all counting on you. Do ask to be briefed by the entry supervisor regarding any coordination that has been made with other work groups in the area. Do remember that many attendants have perished attempting heroic but ill-advised and unauthorized rescue attempts.

Do remember that your authorized entrants are relying on you. Do take the initiative to learn everything you need to know and how to operate any equipment in support of your entrants. As the hole watch, you are the critical link that can make or break a successful entry operation.

Click picture to download Safety Requirements for Confined Space Attendants.

 Written by Pat Furr, Safety Officer & VPP Coordinator for Roco Rescue, Inc.

read more 

NDSC to Host Roco Rescue Training

Tuesday, October 17, 2017

Join us in Bismarck, ND, for Roco’s Industrial I/II course at the Safety Council’s new training facility. The NDSC has an indoor confined space rescue prop designed with input from Roco Rescue. Click here (or the picture) to download the flyer information.

This course is for industrial and municipal rescuers who handle confined space and high angle rescues in industrial environments. Course dates are November 13-17, 2017.

Call the NDSC at 800-932-8890 for more information; or contact Roco at 800-647-7626. We will also be conducting additional Roco courses at the NDSC in 2018.

read more 

Planning for Successful Confined Space Rescue

Thursday, September 21, 2017

By Dennis O'Connell, Roco Director of Training & Chief Instructor

I am often asked by plant managers or rescue team supervisors about getting their team on the right track as far as training and competency is concerned. Here are a few tips for doing just that…

First of all, I always recommend that they choose a single provider for their confined space and high angle rescue training. Using multiple training providers (even if they are similar) adds to the confusion of team members as to what techniques and equipment are being used – especially during a real rescue!

I then suggest that the team’s training records be reviewed in order to determine what level of training has been completed. I also strongly recommend getting everyone to the same level; especially if your facility is what I refer to as an “island unto itself.” In other words, do you have nearby facilities or other local agencies who can offer additional manpower, equipment, etc. in an emergency – or, are you fairly isolated?

Same Page, Same Language
If your facility is somewhat isolated, getting all your rescue team members on the same page, talking the same language, and at the same level of training is extremely important. You may have some experienced rescuers who have completed a variety of courses from different providers and are trained to different levels. Is this previous training properly documented should you be asked about it and to what levels? Having everyone on the same level – with the same basics under their belt – is key to performing a timely and successful rescue
And, do you have a particular goal or level you want your team to strive for, achieve, and maintain? Determining your overall goal for the team is significant in planning for and achieving results. Haphazard training “just for the sake of training” is not necessarily a good thing, and it tends to generate complacency among team members. Besides the obvious, your team “needs to be able to perform a rescue should the need arise.”

Is It Documented?
Take a look at how the training was conducted, documented and what standards were met, if any. And, if you have permit spaces or personnel working at height, I’m assuming that OSHA compliance is a given, but what about meeting requirements of the National Fire Protection Association (NFPA) for rescuers; namely, NFPA 1006 and 1670.

If there is an incident and OSHA or some other regulatory organization were to investigate, how would you provide the documentation that your team is capable of doing what is required of them? Remember, if it can’t be documented, it doesn’t exist!
Using NFPA 1670 (“team” standards) and NFPA 1006 (“individual rescuer” standards) as a basis for the team’s training level will help to provide the needed documentation and add to the credibility of your team’s capabilities. Ideally, all your team members should be certified to the Confined Space Rescue Technician level (NFPA 1006) along with the documentation to back it up.

Because NFPA’s Confined Space Rescue Technician includes confined space and high angle (elevated) rope techniques, I don’t necessary suggest that industrial clients be required to achieve “Rope Rescue Technician.” The added skills of Rope Rescue Technician include less-seldom-used techniques in industrial rescue such as rope ascension and traverse. Do make sure, however, that the course you choose for Confined Space Rescue Technician incorporates some (not all) of the high angle skills you would need to perform elevated rescue at your site.

A Mix of Confined Space and Rope Rescue

If you have a variety of experience and training levels among your team members, it’s important to get them consistently trained and all trained to the same level. Of course, I would recommend Roco’s Fast Track 80™ course, which includes a two-year certification. This course was designed to meet the needs of industrial facilities with a mix between “confined space” and “rope” technician skills needed. The class is geared for confined space rescue with some of the additional rope technician skills needed for elevated or high angle rescue. The class efficiently gets the rescuer to the Confined Space Rescue Technician level in only 80 hours using both performance-based and written testing.

Of course, the next challenge is getting the entire team trained to the same level. It’s not going to be easy to get an entire team released for training all at once – thus compromising the availability of rescue personnel onsite should an emergency arise. Therefore, you may have to run a couple of classes to get everyone certified – or send some of your team (or new team members) to an open-enrollment course.

Testing to the NFPA 1006 Professional Qualifications standard is conducted on the last day of the Fast Track 80™ class. Note: If some of your personnel have already completed this class, they can join the class for the last four days in order to be recertified. This will allow the new members and more experienced team members to work together in realistic practice scenarios. It will help get everyone on the same page as far as techniques plus give the experienced personnel a 3-day refresher and practice time before re-certification testing.

Training Cycle for Compliance
Once all team members are trained to the same level, I recommend going to a two-year rotation. For example, once everyone is certified, the next year would be a Roco Team Performance Evaluation (TPE) where we come for two-to-three days and run teamed-based evaluations using multiple rescue scenarios. Each scenario is critiqued by evaluators to adjust any problems found along the way. The TPE would be followed by a written report to document the scenarios conducted as well as discrepancies found and corrected. The following year would be Re-certification to NFPA 1006 (three-to-four-day session) that includes Individual Performance Evaluations (IPE) where team members would refresh personal skills as well as run several scenarios before testing for re-certification to Confined Space Technician level.
This rotation will help with OSHA compliance by meeting the minimum annual practice requirements as well as by providing a performance evaluation of rescue services as stated in Note to paragraph (k)(1) from 1910.146: “Non-mandatory Appendix F contains examples of criteria which employers can use in evaluating prospective rescuers as required by paragraph (k)(1) of this section.”
In addition, both OSHA 1910.146 and 1926.1211 require timely and capable rescue services for permit spaces. They also require minimum annual rescue practice in the applicable types of confined spaces as well as proficiency for team members. This cycle of training works well in documenting that you have met these minimum requirements while also meeting the requirements of NFPA.

The TPE supporting documentation also provides a “snapshot” of where your team and its individual rescuers stand in terms of competency. This information can then be used as a tool to design internal drills that correct any discrepancies while getting the most from your “all too limited” practice time.

I hope these recommendations are helpful in planning for the success of your rescue team – especially when it’s all on the line during an emergency situation. If you have any questions, don’t hesitate to call me at 800-647-7626 or send an email to info@rocorescue.com.
read more 

Keeping Pace with Fall Protection

Tuesday, August 08, 2017

We all know that initial safety training is a crucial element of our programs that aim to keep our employees protected from harm at work. For any and all hazards (or potential hazards} to which we expose our workers, we must ensure they understand the nature of the hazards and how to protect themselves.

Initial safety training and proper safety equipment, combined with good old-fashioned experience, goes a long way in ensuring a safe work environment. But, at times, we must provide re-training for our employees – and there are many reasons for this.
For example, if our employees demonstrate a lack of knowledge or acceptable performance in regards to any particular hazard, we must provide re-training. If the process or equipment changes, we must provide re-training. If new safety equipment (includes systems as well) is brought into the program, we must re-train our employees on its proper use. And, finally, if there are changes to safety legislation or best-known practices, we need to re-train.

It seems that every week a new piece of fall protection equipment is brought to market – and for the most part, these emerging technologies make work-at-height safer than ever before. Additionally, these newer fall protection items tend to be lighter, more comfortable, easier to operate, and can even perform multiple safety functions. This is all great news, but not every item/system is right for the varied situations encountered at our workplaces. But when we do introduce a new piece of fall protection equipment to our workforce, it nearly universally calls for some degree of re-training. The manufacturer’s instructions for use may be a great starting point to satisfy this training, but it is always a good idea to provide some degree of formal training on the equipment, and then document that training.

The extent of this re-training is dependent on the complexity of the new equipment and the authorized person’s general knowledge base. Sometimes the user manual does not cover all the points that the re-training should convey. For example, harness-mounted self-retracting lifelines are becoming more and more prevalent in the work-at-height environment. In addition to the standard training for pre-use and periodic inspections, proper mounting, operating capabilities and limitations, at least one other point of training seems to be required. The worker cannot walk too quickly away from their anchorage lest they engage the arresting mechanism which abruptly stops the worker in their tracks. This may at times create a new hazard by jerking the worker off balance or causing them to drop objects they may have been carrying. I have even heard some tales of individuals suffering minor injuries due to the sudden stop. So, even though you may not find this point of training in the user’s manual, it comes with experience and should be included in the re-training for this type of new equipment.

Another reason to provide re-training for fall protection has to do with an observed deficiency in an authorized person’s knowledge or performance regarding fall protection. Now this can become a little tricky to find the root cause of the deficiency. Is it truly a lack of knowledge on the authorized person’s part, or is it a disregard for required procedures? Sometimes it's a mix of both. No matter the primary cause of the deficiency, if that authorized person is to remain on that job, it is incumbent on the employer to provide proper re-training. And I will say it again, document that re-training!

We have recently had a significant legislative change to the general industry standard for fall protection. On Nov. 18, 2016, OSHA 1910 Subpart D “Walking-Working Surfaces” was published and became effective on Jan 18, 2017. The major changes to this final rule have to do with physical changes to existing and future structures regarding the phase-in of ladder safety systems,

• Eliminating the outdated general industry requirements for scaffolds and adopting the construction industry’s scaffold standards,• Guidance on the use of rope descent systems and qualified climbers, as well as some other changes. But the most significant changes that will drive training and re-training requirements is the added flexibility of using personal fall protection systems for authorized persons. These personal fall protection systems include fall restraint, work positioning, and personal fall arrest systems (PFAS). OSHA has eliminated the mandate to use guardrail systems as the primary fall protection method and now allows the general industry employer to determine the fall protection method that they feel is best suited for the nature of the work at height. And this now includes personal fall protection which was not addressed prior.

For general industry employers, who prior to the new Subpart D did not allow their employees to use personal fall protection systems other than in accordance with 1910.66, the option to do so now will be deemed compliant. And, of course, this will require initial training and re-training for the use of personal fall protection equipment and systems. Additionally, employers that introduce the authorized use of work positioning and personal fall arrest systems to their workplace will also have to provide training on rescue of these workers if they are relying on an in-house rescue capability.

In the years I have been involved with safety and rescue training, one subtlety that I observe is this:

Oftentimes an employer or their employees do not realize they have a training deficiency until after they've gone through the training.
This is certainly true when it comes to rescue training. At the conclusion of nearly every rescue class I teach, at least one of the students says they never realized what all was involved in rescue and what the limitations of certain rescue systems were. And this is consistent with my interviews and reviews of rescue programs when I am asked to perform needs assessments at various facilities. Unless you have a background in technical rescue, it is very difficult to visualize the systems, skills, and equipment required to safely access and rescue a fallen/suspended victim.

Both OSHA and ANSI require employers to provide "prompt rescue" of employees they authorize to work at height while using personal fall arrest systems. OSHA has published a Safety and Health Information Bulletin recognizing suspension trauma as a workplace hazard affecting workers that use personal fall arrest systems. Many employers address rescue of fallen/suspended workers in their fall protection programs, but stop at merely developing written policies that may fall well short of the requirements needed at the time of an incident. This falls back to my earlier point that an employer that has a limited background and understanding of the complexities of performing rope rescue, especially if it requires technical skills beyond the simplest rescue, may not understand what the true requirements are for their facility. Sort of like that general saying last year that “We don’t know what we don’t know.” So, training for rescue is a subcategory of fall protection training that does not have as much easily accessed guidance and resources to rely on as a guide.

Quality training will include several of the points that I have detailed so far. The training will be pretty specific to the job with very little time spent on irrelevant material. The training will be of the type that best transfers the information in either a vocational or academic manner. The training will close the gaps that have been identified and arm the employer and the students with a better understanding of what is truly required to perform the job, which is especially true for rescue. But finally, the training should be delivered in such a manner that it captures the students’ interest. The best outcome of training, the classes where the student finishes with the highest level of retention, understanding and performance, are the classes that compel the students to engage in the learning.

I think it is a safe assumption to say that we have all sat through classes wondering when and hoping for the class to end. Looking at our watch is one thing, but when we are tapping it to see if it is even still working is a really bad sign. I am not suggesting that educators have to provide entertainment, but there is a demonstrated positive difference in classes delivered by an engaging trainer as compared to a very dull, monotonous trainer.

In addition to seeking an engaging trainer, it is important for the trainee to take some ownership in the learning process as well. This is where the adult learner has an advantage over younger learners. We as adults generally understand that the training will result in a better understanding of the job requirements and in many cases is a factor in career progression.

I encourage you to seek out the training that your employees need. Or, as an employee yourself, seek out quality, applicable training. Review the course syllabi and determine if it will close those knowledge and skills gaps that you have identified. Always back up those fancy sales brochures by reaching out to others to get their opinion on their experiences with the training in the past. Also, remember to consider re-training as needed and always document. These things are important for the overall quality and credibility of your safety training programs.

Article by Pat Furr, Safety Officer & VPP Coordinator for Roco Rescue, Inc. 

read more 

Trench Collapses…one of the most dangerous hazards in construction

Wednesday, July 19, 2017

A month after a 33-year-old worker died while working in an unprotected trench, OSHA inspectors found another employee of the same Missouri plumbing contractor working in a similarly unprotected trench at another job site. OSHA determined that, in both cases, the company failed to provide basic safeguards to prevent trench collapse and did not train its employees to recognize and avoid cave-in and other hazards. OSHA issued 14 safety violations found during both inspections, and proposed penalties totaling $714,142.

Trench collapses are among the most dangerous hazards in the construction industry.

Twenty-three deaths from trench and excavation operations were reported in 2016. In the first five months of 2017, at least 15 fatalities have been reported nationwide.

Gain knowledge, develop skills, and learn to recognize trench hazards by registering for Roco's Trench Rescue course. Our desire is for everyone to return home safely each day, and for this fatality number to not continue to increase.

Source: OSHA QuickTakes July 2017

read more 

Local Departments Support Recovery Efforts

Friday, July 07, 2017

On 6/30/17, at approximately 4:23 AM, the East Side Fire Department (ESFD) was contacted by the Denham Springs Fire Department (DSFD) to provide technical rescue assistance on the Amite River Bridge just outside the City of Baton Rouge. DSFD requested high angle rescue personnel to aid the fire personnel already on the scene in rescuing a person who had jumped from the Hwy. 190 bridge span. While in route to the incident, East Side personnel were advised that the person who jumped had fallen approximately 40 ft. and had succumb to his injuries. High angle rescue support was still needed to transport the deceased up to the roadway surface.

Upon arrival, East Side Captain Chris Toucey directed personnel in constructing a mechanical advantage system to be utilized during recovery efforts. Captain Toucey also directed personnel in setting up a high-point anchor using the platform on their tower ladder. A stokes basket was lowered to DSFD personnel who packaged the deceased for transport. Once secured, the stokes basket was hauled up to the road surface using a Z-rig mechanical advantage system. The victim was then transferred to awaiting medical personnel.

Roco would like to commend both the Denham Springs Fire Department and the East Side Fire Department for a safe and efficient recovery.

read more 

Rescue Toolbox: Petzl Rescucender

Wednesday, July 05, 2017

The Rescucender is one more quality piece of rescue hardware for your toolbox. Roco is proud to have been one of the first rescue training companies approached by Petzl to be shown the new device and asked to evaluate it. We were excited to see and use it from Day 1, and we then added it to our training kits as soon as they became available.

There’s no doubt, as computer assisted design (CAD) and precision computer numerically controlled (CNC) machines are used more and more in designing and manufacturing new rescue hardware, we are seeing some absolute gems coming to market. And I say gems, referring to function as well as appearance. There are still times when stamping and casting hardware is appropriate, but if there is a good reason to machine a piece from solid aluminum stock, it generally results in a lighter, smoother, more precise piece of kit.

And that is the case with the new Petzl Rescucender. It is primarily machined out of solid forged aluminum with some bits that are manufactured in a more traditional manner. But the end result is one of those gems. I have been waiting for an NFPA-rated, one-piece mechanical cam for quite some time; and now it is here. My first experience with a one-piece cam was with another Petzl product known as the Shunt. The ease of loading it onto, and stripping it off, the rope made it so much faster and greatly reduced the chance of dropping it. This is especially important when 300 feet or more on a tower!

The limitations of the Petzl shunt made it inappropriate for most technical rescue operations except for certain specialized situations such as during rope access or tower rescue when we are generally dealing with lighter rescue loads. The maximum rope diameter that the Shunt can handle is 11 mm. The new Rescucender is NFPA 1983 T Rated and accepts rope diameters from 9-13 mm.

But as important as the ease of mounting/dismounting is, what I really like about the shunt, and now the new Rescucender is the fact that the shell and the shoe are no longer connected together with a light cable or a thin piece of fabric. I have a few pet peeves, and one of them is seeing rescuers strutting about with a two-piece cam hanging from their gear loop unassembled. The shoe is clipped but the shell is just flapping in the breeze hanging from that thin tether waiting to get jammed into a piece of the structure and break free from the shoe. And, if you don’t believe that happens, you haven’t been doing this long enough, or it may be that your team is really good about assembling their two-piece cams when storing or hanging them from their gear loops. So that whole problem of the shoe ending up in Kansas City while the shell is somewhere in Oshkosh is now eliminated with the introduction of the Rescucender.

The attachment hole in the cam arm is extra-large which allows for rotation of your connector. This doesn’t sound like that big of a deal, but once you start using equipment that allows rotation of the connector from end to end, you will appreciate it. 

As with any piece of rescue equipment, it is important to be properly trained in its use. The action for opening and closing the Rescucender becomes very intuitive in a short amount of time. The engagement and movement of the shoe along its guides oozes precision and the solid feel in your hand lends a high degree of confidence. The device is equipped with a spring that has a light action and is primarily intended to prevent fouling. Our experience is the cam runs rather freely down the rope in vertical applications when attached to a pulley. This provides the convenience of creating longer “throws” with a Z-rig or piggy-back hauling system. The balance between the spring action and the need for the cam to remain open in progress capture applications is spot on. It also has just enough passive camming action to remain in place without back-sliding during rope ascents. It runs free when you need it to, and then grabs the rope when needed.

We all know that the pin needs to be completely seated in most two-piece mechanical cams, the new Rescucender does not have a removable pin but instead has dual safety catches, one on each side of the body. Once the device is installed on the rope, it is important to check that there is no “red” of the visual indicators showing. You will feel and hear a distinct click when the safety catches engage. Additionally, the problem of installing the shoe the wrong way in the shell is now eliminated as the Rescucender does not allow 180 degree rotation of the shoe in relation to the shell.

I continue to be excited about the evolution of rescue equipment. It doesn’t seem that long ago that we moved from goldline ropes to kernmantle, but years would go by without seeing any major breakthroughs in modern equipment. Well, those days are over. It seems that the digital era, as well as the push from various agencies and users, combined with the “out-of-the-box” thinking of equipment designers is driving the rapid emergence of better and better rescue mousetraps.

It’s a good time to be in rescue, it always has been, but the versatility, precision, and safety of modern equipment sure makes our tasks easier today than ever before.

Article by Pat Furr, Safety Officer & VPP Coordinator for Roco Rescue, Inc.
Pictures courtesy of Petzl

read more 

Tougher Penalties for Harming First Responders

Friday, June 23, 2017

House passes bill to toughen penalties for harming first responders

Washington – In response to a spike in the number of police officers killed in the line of duty in 2017, the House on May 18 passed a bill that seeks stricter penalties for people who harm or attempt to harm first responders.
The Thin Blue Line Act, sponsored by Rep. Vern Buchanan (R-FL), would make the murder or attempted murder of a police officer, firefighter or other emergency personnel an “aggravating” factor in death penalty determinations, a press release from Buchanan’s office states. If approved, the law would apply to crimes under federal jurisdiction.

As of June 20, the National Law Enforcement Officers Memorial Fund counted 63 police fatalities in 2017 – an increase of 34 percent from that same date in 2016. Twenty-two of the fatalities were firearms-related (up 10 percent from the previous year), 25 were traffic-related (up 19 percent) and 16 were from other causes (up 167 percent), according to the organization.
“America’s police officers and first responders are the first ones on scene to help those in harm’s way,” Buchanan said in the press release. “These brave men and women and their families put it all on the line and deserve our unwavering support. Getting this bill signed into law will protect those who serve our communities and send a clear message: targeting or killing our first responders will not be tolerated.”
The bill, approved by a 271-143 vote, now moves to the Senate for consideration.
Source: Safety and Health Magazine June 2017
read more 

Calculating Compound M/A

Tuesday, June 13, 2017

We recently had a request for additional information beyond what was shown in our “Theory of Mechanical Advantage” video by Chief Instructor Dennis O'Connell. The reader would like to know more about calculating compound mechanical advantages.

First of all, a simple mechanical advantage (MA) is quite easy to calculate as long as you follow a couple of basic rules.

MAs are generally expressed in numeric ratios such as 2:1, 3:1, 4:1, etc. The second digit of the ratio, or the constant "1" represents the load weight. The first digit, or the variable 2, 3, 4, etc. represents the theoretical factor that we divide the load weight by, or inversely multiply the force we apply to the haul line.

I say theoretical as these calculations do not take into account frictional losses at the pulleys and resistance to bend as the rope wraps around the pulley tread. So a 3:1 mechanical advantage would make the weight of a 100-pound load feel like 33 pounds at the haul line, but we do lose some advantage due to those frictional losses. An even more important consideration is the fact that we multiply our hauling effort by the variable, which is important to understand when we think about the victim or an on-line rescuer that has become fouled in the structure. This is also important when considering the stresses on the haul system including the anchor, rope, and all components in the system.

We also need to pay attention to the amount of rope that must be hauled through the system to move the load a given distance. If we are using a 4:1 MA and need to move the load 25 feet, we need to pull 100 feet of rope through the system (4 X 25 feet = 100 feet).

To calculate a simple MA, remember this: if the anchor knot is at the load, it will be an odd mechanical advantage (3:1, 5:1, 7:1, etc.). If the anchor knot is at the anchor, it will be even (2:1, 4:1, 6:1, etc.) “even/anchor-odd/load.” And if you count the number of lines coming directly from the load, you will determine the variable (remember not to count the haul line if it passes one final change of direction pulley). For instance, if the knot is at the anchor and there are four lines coming from the load, this will result in a 4:1 simple MA. And if your haul line is being pulled away from the anchor, that only means you have created one final change of direction which oftentimes is done to allow the addition of a progress capture device (ratchet), or simply to make it a more convenient direction of pull. But this 5th line, called the haul line, does not come directly from the load. It comes from the final directional pulley to the haul team and is not to be counted in the simple MA ratio. We would call this set up a 4:1 MA with a change of direction (CD).

Calculating compound MAs is also quite easy. Compound MAs (sometimes called a stacked MA) simply means we are attaching a second MA to the haul line of the original MA. When we do so, we multiply the first digit of the original MA by the first digit of the second MA. If you attach a 2:1 MA to the haul line of a 4:1 MA (2 X 4 = 8), you end up with an 8:1 compound MA. Keep in mind that we have added even more frictional losses into this system, but it is still a pretty powerful MA.

There are potential benefits as well as potential penalties when using compound MAs. One benefit includes using less gear when stacking MAs. For instance, to build a simple 6:1 MA, you will require at least five pulleys, and if you want a final CD, that would require one last pulley for a total of six pulleys. If you decide to build a 6:1 compound MA, you can get away with as few as three pulleys by attaching a 2:1 MA to the haul line of a 3:1 MA. If you wanted one final CD, you would again add one more pulley for a total of four pulleys. The obvious advantage is that fewer pulleys are required, but hidden in there as another advantage is fewer pulleys for the rope to wrap which translates to less frictional loss and bend resistance.

Another benefit to stacking MAs may be the reach you need to attach to the load. If the load is 25 feet away from the anchor and you are using a 6:1 simple MA, you will need at least 150 feet of rope, plus some extra to tie the anchor knot, and some spare to wrap over the final directional - if you use one. If the load is 50 feet below the anchor and you want to stick with the simple 6:1 MA, you are looking at a minimum of 300 feet of rope.

So, what if we send a 3:1 MA down from the anchor to the load 25 feet below and attach a 2:1 to the haul line of the original 3:1 to build a 6:1 compound MA?

Well, in this case we would need 75 feet of rope plus some extra for knots for the original 3:1, and two times the length of the compounding MA throw. Throw? What the heck is throw? Throw is a term we use when we have a limited distance between the compounding MA anchor and where we can safely attach the compounding MA to the haul line of the original MA.

In the diagram below you can see the original 3:1 MA extending from its anchor to the load. The added MA, which in this case is a 2:1 has a total throw of 10 feet which requires a little over 20 feet of rope to construct. So, if we add the 75+ feet of rope required for the original 3:1 to the 20+ feet for the added 2:1, we arrive at a bit over 95 feet of rope required for this compound 6:1 MA to reach a load 25 feet from the anchor. This can be two separate ropes, one a bit over 75 feet and a second a bit over 20 feet, or it can be one rope a bit over 95 feet that we can treat as if they were two separate ropes. More on that in a bit.



Remember that we must consider the amount of rope that we need to pull through the system in order to move our load the required distance. So, using a 6:1 compound MA to move the load 25 feet we must pull a total of 150 feet of rope through the system. Whoa, wait a minute! I thought we determined that our total rope needs were only a bit over 95 feet, so how did we come up with 150 feet of rope? One of the disadvantages of compound MAs is the need for resets when the throw is not long enough to move the load the needed distance. So, even though we are using in the neighborhood of 95 feet of total rope, we are pulling the same section of rope through the second MA multiple times.

Well, this is one of the big disadvantages of a compound MA. We need to reset the system multiple times to move the load the required distance. To help envision a reset cycle, let’s assume we have our original 3:1 mounted to an anchor, and 25 feet from that anchor is the 3:1 attached to the load. The haul line of the original 3:1 goes through a final CD, and we have attached a ratchet at that final CD to capture the progress of the loads movement. One option is to find a second anchor and in this case we found one 10 feet away from the final CD of the 3:1. We tie an anchor knot and attach it to that second anchor and route the remaining 20+ feet of rope through a pulley which we attach to the haul line of the original 3:1 with a rope grab. We now have our 2:1 pulling on the haul line of a 3:1 resulting in a 6:1 compound MA.  But…… and there’s always a “but,” isn’t there? We can only move the load a bit over 3 feet at a time before we completely collapse the 2:1 and need to reset it for the next haul. Remember, the 2:1 only has a 10-foot travel or “throw” and that distance is divided by 3 as it is pulling on a 3:1 MA. In addition to that, we have pulled about 20 feet of rope through the 2:1 just to move the load a bit over 3 feet. In order to move the load the entire 25 feet we will need to reset the system about 8 times and that is some slow going. Just to point out one option to speed up the haul by reducing the amount of resets needed, if you sent the original MA to the victim as a 2:1 and then stacked a 3:1 MA with 10 feet of throw onto that 2:1, you would still have your compound 6:1 but would only need to do about 5 resets and could do it with a bit over 80 feet of rope.




There are all sorts of options when deciding what type and ratio of MA to use in a rescue effort. You can get pretty creative when building MAs, but be aware that creativity can sometimes lead to crazy. Remember the KISS principle…keep it simple and safe.

If you are overbuilding an MA just to show a cooler way of doing it, you may be missing the point of the job. There is someone in trouble that is relying on you getting them up and out of their predicament, and sometimes we can get a little carried away with our creativity, especially when it comes to MAs. 3:1 Z-rigs are a great option especially with the addition of devices like the Petzl ID or the CMC MPD as your first MA change of direction and progress capture device. Plus, this gives you the ability to convert to a lower with friction control already built in. But you can really complicate things by compounding a second MA onto a Z-rig to get a higher ratio MA. You will soon learn that now you have to perform two separate resets of the haul cams. And, if you are out of sequence in the reset, the haul cam of the second MA will jam into the traveling pulley of that system and stop you in your tracks. There are some tricks to really make the resets for this system go nicely, but that will have to wait for another day.

There are hundreds of variations that you can use for compounding MAs, but once again I caution you to remember KISS. I have my favorites and every once in a while the situation calls for something a little different, and that’s where understanding the advantages and disadvantages of the systems is of great value.

For additional video resources on mechanical advantage as well as other techniques and systems, visit Roco Resources.

read more 

Cal/OSHA Cites Two Companies After CS Death

Tuesday, May 30, 2017

On Oct. 21, 2016, a D&D Construction employee entered a drainage shaft to clean out mud and debris. No personal fall protection was utilized as the worker descended via bucket 10 ft. into the shaft, which was 4.5 ft. in diameter and lined with concrete.

At some point, the worker lost consciousness due to the oxygen deficient atmosphere in the confined space and fell 40 ft., then drowned in a foot of water.

“Cal/OSHA launched a confined space educational program to bring attention to the dangers and preventable deaths that occur in confined spaces,” said Cal/OSHA Chief Juliann Sum in a statement. “The program helps employers identify hazards and create effective safety plans that include air monitoring, rescue procedures and training before work begins.”

General contractor Tyler Development was constructing a single-family residence in the Bel Air area and hired subcontracted D&D Construction to install and service reinforced concrete posts known as caissons on the property, according to the agency’s report.

The state-run occupational safety unit cited Tyler Development and D&D Construction Specialties Inc. a combined $352,570 for ten serious and willful health and safety violations following an investigation. Cal/OSHA said neither company was in compliance with required confined space procedures.

D&D Construction previously was cited in 2012 for similar safety violations at a different job site.

In total, D&D has to pay a proposed $337,700 for 13 violations, including two willful serious accident-related, one willful serious, one serious accident-related, six serious, and three general in nature.

According to Cal/OSHA, the company failed to:
• ensure safe entry into the confined space
• have an effective method to rescue the worker in the confined space in an emergency
• test the environment to determine if additional protective equipment, such as a respirator or oxygen tank, were required to work safely in the shaft.

Tyler Development was cited $14,870 for five violations, three of them serious, for a failure to:
• evaluate the worksite for possible permit-required confined spaces
• ensure that the subcontractor meets all requirements to comply with a permit space program
• protect workers from the hazard of impalement by guarding all exposed reinforced steel ends that extend up to six feet above the work surface with protective covers

A full copy of the report is available here.

read more 

Next
1 2 3 4 5 .. 30

RescueTalk (RocoRescue.com) has been created as a free resource for sharing insightful information, news, views and commentary for our students and others who are interested in technical rope rescue. Therefore, we make no representations as to accuracy, completeness, or suitability of any information and are not liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis. Users and readers are 100% responsible for their own actions in every situation. Information presented on this website in no way replaces proper training!