Photo Courtesy of http://www.stage-entertainment.de/

Columbus McKinnon recently supplied Pfaff-silberblau brand products for a new musical venue in Hamburg, Germany. Stage Entertainment constructed the ultra-modern performance venue, “Theater an der Elbe,” capable of holding more than 1,800 spectators for the production of “The Miracle of Bern.”

Stage Entertainment commissioned Columbus McKinnon Engineered Products GmbH, based in Kissing, for the design, project planning and construction of the stage upper machinery and the “iron curtain” for the venue.

For the technical fire-protection equipment and the stage upper machinery, the company invested in tried-and-trusted stage technology from Pfaff-silberblau – our powerful DELTA electromechanical wire rope winches. These winches are designed to move the stage scenery and props quickly and precisely, while ensuring a maximum level of safety for the performers on the stage in accordance with the safety regulations for public performance venues BGV C1 and DIN 56950.

For the daily performances of the musical, more than 28 DELTA winches are used. Designed for loads between 650 kg and 1,500 kg, they move stage scenery and props with a speed of 1.2 m/sec and approximately 8 km of wire rope. The winches are anchored in a fly loft, which Pfaff-silberblau designed, produced and installed to meet specific customer requirements. Altogether, Pfaff-silberblau engineers installed a total of 15 tons of structural steelwork for the theatre’s fly loft. This is a great example of Pfaff’s products at work in a tough and challenging application.

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This article is Part 3 of a 6-part blog series that will cover what professional riggers should consider when performing an in-depth alloy chain sling inspection. Today, we’ll discuss wear and corrosion.

Figure 1

Figure 1: Inspection for interlink wear can be easily detected by collapsing the chain.

When used in rigorous material handling applications, chain can easily become worn or corroded. It is important to inspect chain for defects on a regular basis to avoid an unsafe lifting condition or even operator injury. When corrosion and wear occur, it results in a reduction of link cross-section which can lead to decreased strength of the chain.

Corrosion can occur anywhere chain comes in contact with harsh chemicals, water or when it is used in tough environments.

Wear can occur in any portion of a link that is subject to contact with another surface. The natural shape of chain confines wear, for the most part, to only two areas. These are, in order of importance, (a) at the bearing points of interlink contact, and (b) on the outsides of the straight side barrels that may be scraped from dragging chains along hard surfaces or out from under loads.

Figure 1 illustrates the condition of interlink wear and shows how to inspect for it. Notice how easily such wear can be detected by collapsing the chain to separate each link from its neighbors. An operator or inspector can also check for corrosion using the same method.

When wear or corrosion is observed, the next step is to determine how severe the damage is and if the chain can still be safely used. General surface corrosion can be removed by cleaning and oiling the chain. If pitting is observed after cleaning and oiling, remove from service. Next, the operator should take a caliper measurement across the worn section of chain and compare it to the minimum allowable dimension for that chain.

See the chart below for minimum section dimensions or wear allowances for Grade 80 and 100 Chain. If the chain does not meet these minimum dimensions, it should be removed from service and replaced.

Wear Allowances

Stay tuned for our next part in this series where we’ll talk about Chain Inspection.

Additional Resources:

In-Depth Alloy Chain Sling Inspection Part 1: Twisting & Bending
In-Depth Alloy Chain Sling Inspection Part 2: Nicks and Gouges

To learn more, view our Chain Sling Inspection Safety Webinar.
Want to get trained? Check out our Qualified Rigger 3 day Workshop.

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Understanding the Difference between Chain Grades and How They’re Used

May 7, 2015

Chain has been around for over a thousand years. It is one of the most versatile and reliable ways to lift, tension and tie down materials in a variety of applications. In the past, people would use any type of chain to lift something, tie down a load or tow a vehicle. Proper inspection, safety […]

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#rigsafe: Promoting Safe Rigging in the Entertainment Industry

April 30, 2015

On Friday, April 24th we celebrated #RigSafe day, an initiative started by the United States Institute for Theatre Technology (USITT) to promote safe rigging in the entertainment industry. USITT asked companies to join the initiative by sharing rigging safety tips on social media under the hashtag #rigsafe. Columbus McKinnon participated in the event, tweeting our […]

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Unique Uses for CM Industrial Rigging Equipment

April 16, 2015

As a manufacturing and engineering company, Columbus McKinnon places high value in STEM education – education encouraging students to pursue careers in Science, Technology, Engineering and Math. But, in recent years, STEM education has evolved into STEAM education, which aims to connect art to these areas of study to demonstrate how industrial products can contribute […]

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In-Depth Alloy Chain Sling Inspection Part 2: Nicks and Gouges

April 10, 2015

This article is Part 2 of a 6-part blog series that will cover what professional riggers should consider when performing an in-depth alloy chain sling inspection. Today, we’ll discuss nicks and gouges. When chain is used to lift, pull or secure materials, the outside surface of the links can come in contact with foreign objects […]

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Get Genuine Columbus McKinnon Hoist Parts with the New Parts Star Program

April 1, 2015

Ordering replacement parts for CM, Yale and Shaw-Box brand electric chain and wire rope hoists is easier, faster and more economical than ever with Parts Star™ by Columbus McKinnon. The Parts Star™ replacement parts program ensures customers that they’re getting authentic Columbus McKinnon parts — the parts designed to fit the hoist’s exact specifications, maintain warranty […]

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We Are Where You Are: Columbus McKinnon Opens New Modern Warehouse in Houston

March 27, 2015

As some competitors are closing and consolidating their distribution centers, Columbus McKinnon continues to invest in its network of warehouse facilities in North America. We’ve worked hard to strategically position our facilities across the country to align ourselves with the critical needs of our customers – one of which is fast delivery of our products. […]

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Do You Need to Load Test When You Replace the Wire Rope in an Underhung Hoist?

March 13, 2015

Richard, a recent safety webinar attendee, asks: “Do you need to load test when you replace the wire rope in an underhung hoist?” Peter Cooke, CMCO Training Manager and Safety Webinar presenter, answers: The replacement of wire rope or chain for underhung hoists is specifically excluded from load test requirements. The wire rope should have already […]

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Columbus McKinnon Products and Services on Display at Tradeshows

March 6, 2015

Trade shows are a great way for us to meet Channel Partners and end users, and to showcase our latest products and services. We’re always excited to connect with business associates and make new friends. Representatives from our Columbus McKinnon de Mexico and Duff-Norton facilities participated in Expo-Manufactura, a trade show held recently in Monterrey City, […]

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