Chain Inspection photoHere is a question from Adam, a mobile crane operator working in the mining industry, who regards proper rigging equipment and practices as a major safety priority:

“We have a 1-inch GR80 chain sling, 30 feet in length that is around ten years old and in good condition, although there is inner link wear throughout the sling at its bearing points. The narrowest measurement in link diameter at any point was .945″, which is well away from removal criteria. No components in the sling show any evidence of a stretch condition, and the sling has not been subjected to overload to the best of our knowledge, though I cannot guarantee that.

“The reach of the sling is approximately four inches longer than its tag indicates. According to my calculations, this stretch is due to the contact wear in each link. The chain moves freely and there is no binding or restriction of movement. Is this legitimate? If so, does the tag need to be replaced or modified to indicate its current length? Our inspections have always been completed by a company assigned employee.”

Response from Peter Cooke, training manager:

Thank you for reaching out to us. For your reference, I have included a section on alloy rigging chain inspection from our Columbus McKinnon rigging catalog here. Be sure to do a link-by-link inspection and follow the rejection criteria from OSHA 1910.184 and ASME B30.9. Be sure there are no stretched links. Reference the “Allowable Chain Wear Allowance tables” from the manufacturer and ASME B30.9.

Not knowing your exact configuration, I will use a standard DOS 1-inch grade 80 x 30’ reach sling as an example. If we just isolated the chain (taking out the master link, coupling links and hooks) you have approximately 106 links of chain. If you determined the minimum thickness to be 0.945” at the bearing points, that is approx. 0.055” of wear from the nominal dimension. 1” grade 80 chain has a pitch length of approx. 3.07” (dimension from the top inner link radius to the lower inner link radius) Let’s assume that wear occurred at both ends of the chain link. The pitch length would increase by 0.11”. Over the entire chain length you could see an increase in reach of approx. 11.66” (0.11” x 106 = 11.66”)

As long as there are no stretched links or deformation this would be acceptable. There is no rejection criteria for reach other than stretch. Wear is not stretch.

There is also no statement in 1910.184 and ASME B30.9 to replace the tag in this event with the correct reach.

A good practice would be to retag the sling with the current reach. The new tag would be considered a repair so your company’s name or initials would have to be on the tag. A load test would not be required. Lastly, lubricating the chain is an excellent way to minimize wear.

{ 2 comments }

2014-LDI-eBlast-Header

The 27th annual Live Design International (LDI) Show kicks off next week. This year, show organizers are expecting more than 8,000 attendees – representing 72 countries – who work in theater, concert halls, outdoor production venues, houses of worship, theme parks and a variety of other live entertainment venues. They are coming to LDI to see the latest and greatest products in action, get a refresher on industry knowledge, and visit with old friends. LDI expects more than 300 exhibitors providing live demos and many discussion opportunities about lighting, sound, projection and special effects equipment.

You can find CM Entertainment Technology (CM-ET) at Booth #2075. Make sure you check out our new booth design featuring a dedicated training center, speaker array application, motors and rigging products, including:

Plus, check out a circa 1950s CM Lodestar. It’s pretty cool! Our sales, product management and training teams will also be available to address your questions about any of our products.

While You’re Visiting, Get Trained
On Friday & Saturday, attend one of our training demonstrations on the CM Lodestar or the top myths about entertainment motors. Times: 11:00am, 1:30pm & 2:30pm.

Or if you have interest in something bigger, you still have time to register for our Road Hoist Technician Certification Class next week.

We will have a strong representation of associates at our booth this year, including members of our North American Entertainment Technology team, CM-ET Training team, Sales and Customer Service.

Please don’t be a stranger. Tell us what you enjoyed most about LDI this year by posting your comments and photos on our Facebook, Instagram and Twitter. We would love to hear from you!

{ 0 comments }

Ask Questions, Share Stories, Get Engaged on Social Media

November 3, 2014

We decided to shift gears this week and show you a little of what we’ve been up to on social media lately. We have many exciting conversations and interactions happening there every day with our Channel Partners, end users and material handling professionals around the world. All of you reach out to us for different […]

Read the full article →

Columbus McKinnon Expands Training Offering to Include NCCCO Certification Program

October 28, 2014

Columbus McKinnon has expanded its comprehensive offering of product and safety training to include NCCCO written and practical certification exams for Overhead Crane Operator Training. The first class will be held November 11-13 at our training center in Tonawanda, N.Y. Columbus McKinnon’s Overhead Crane Operator Training class is comprised of classroom and hands-on training designed to […]

Read the full article →

A Day in the Life of CMCO University

October 15, 2014

Working for Columbus McKinnon for the last fifteen years, I have had the privilege of working with a lot of great people and products. Wanting to get a bit more hands-on experience with CMCO hoists and rigging products, I recently completed our CMCO University course at our Niagara Training Center and am more motivated than […]

Read the full article →

Is Your Material Handling Equipment Tough Enough for Arctic Environments?

October 7, 2014

  With increasing demand for the exploration and production of natural resources in North Dakota, Alaska and other northern regions in the U.S. and Canada, there is a growing need for cranes and lifting equipment that can withstand exposure to ultra-cold temperatures. When selecting and specifying these products, careful consideration must be given to site […]

Read the full article →

Resources for Rigging Safety at your Fingertips

September 26, 2014

Many of you work with chain and rigging equipment every day; that’s why Columbus McKinnon works hard to promote the safe and proper use of all rigging products regardless of industry or application. Relying on 139 years of experience in the material handling industry, we’re continually striving to expand and improve our comprehensive offering of […]

Read the full article →

Can Lever Tools be Used to Adjust Slings?

September 17, 2014

Richard, a salesperson for a CMCO distributor and recent safety webinar attendee, asks:  “Is it acceptable to use lever tools to shorten or lengthen slings? Are there any concerns of locking up the lever tool brake?”   Peter Cooke, CMCO Training Manager and Safety Webinar presenter, answers: Your first step is to go to the […]

Read the full article →

Look for us at the CVSA Annual Conference in Buffalo, NY, September 14-17

September 10, 2014

The Commercial Vehicle Safety Alliance (CVSA) will be hosting a conference and exhibition in Buffalo, New York from September 14-17 at the Buffalo Niagara Convention Center.   The CVSA is an international not-for-profit organization comprised of local, state, provincial, territorial and federal motor carrier safety officials and industry representatives from the United States, Canada and Mexico. […]

Read the full article →

Does your Overhead Crane Meet OSHA Regulations?

September 2, 2014

Jason, an Assistant Manager with one of our Channel Partners, asks: “I received a call from a customer for whom I had conducted an inspection. The customer stated they received an OSHA reprimand for not having monthly inspections on their cranes. They have 2 top-running bridge underhung trolley-type cranes. OSHA referenced 1910.179 J2IV and 1910.179 […]

Read the full article →