Chain Sling Inspection Guide UAE — Grades & Gauges

How to inspect chain slings: grades, wear gauges, discard rules and quarantine.

Grade 80 vs Grade 100 — Never Mix

Two alloy chain grades dominate lifting work: grade 80, the long-standing standard for chain slings, and grade 100, the higher-strength grade that lets a smaller, lighter chain carry the same working load. The attraction of grade 100 on repetitive rigging is simple physics — less weight to haul, store and handle for the same capacity. Both grades are fully legitimate lifting chain.

What is never legitimate is mixing them. A grade 80 component rigged into a grade 100 assembly, or two multi-leg slings of different grades on the same load, creates a strength mismatch no one can see on the hook. The assembly's real capacity becomes unverifiable, and the rigger ends up planning the lift against numbers that no longer describe the gear.

The defence is the identification tag. Every chain sling must carry a legible tag stating its working load limit, grade and identity, so components stay matched and the inspection record stays meaningful. When a tag is missing or unreadable, the rating is unverifiable, and per inspection practice that alone takes the sling out of service.

Pre-Use Check vs Periodic Thorough Inspection

Chain sling inspection runs on two levels. The pre-use check is done by the user before every shift: sling laid out on clean ground, links run through the hands, hooks checked, tag read. It exists to catch what happened since the last formal examination — a dragged sling, a shock load, a link bent against a steel edge.

The periodic thorough examination is a formal, recorded inspection by a competent person working through measured criteria: wear gauges on the links, pitch checks, hook throat and latch checks, tag verification, and a verdict entered in the inspection register. Many UAE sites align the periodic inspection with their quarterly colour-coding cycle, so a current colour tag confirms at a glance that the sling has been formally examined within the regime.

The two levels do different jobs, and neither covers the other. The register proves the regime exists; the daily check catches damage in the window between examinations. On high-duty UAE sites — steel yards, precast plants, offshore supply bases — both matter, and the register is the first thing a client auditor asks to see.

What Inspectors Measure on Every Sling

A thorough examination measures rather than glances. The first measurement is link wear, checked with a wear gauge and rejected at 10–12 per cent loss of section per practice. Wear concentrates where links bear against each other under load, so the gauge is applied at those contact points rather than at random.

The second is pitch elongation — the distance between link centres — because stretched links are the visible signature of an overloaded chain. Then geometry: a twisted sling that will not hang straight under its own weight is rejected, as are bent links and any link that has been field welded, which destroys the controlled properties of the alloy.

Nicks and gouges matter because sharp metal loss acts as a stress raiser where the load path is thinnest. Heat discoloration — the blue and black temper colours that appear when chain has been heated, typically from contact with hot work — condemns the sling, because the heat treatment can no longer be assumed. Each finding is judged against criteria, not opinion. QIC (Quality International Certifications), a UAE inspection company since 1998, records its chain sling examinations this way.

Rejection Criteria at a Glance

The verdicts in chain sling inspection are binary: the sling either meets the criteria for continued service or it is rejected and quarantined. The table lists the rejection criteria inspectors apply, described the way they present in the field.

Wear Gauges, Hooks, Master Links and Tags

Wear gauges make the wear limit repeatable. The gauge seats over the link at the point of wear, and per practice a gauge that confirms 10–12 per cent section loss condemns the sling — the measurement is physical, not a matter of judgment. Gauge checks concentrate on the bearing points where links meet, and on the outside of bends where dragging wears the metal away.

The master link is examined like any other link — wear, nicks, cracks, distortion — because it carries every leg of the sling at once. Hooks get their own attention: the safety latch must close fully and function so the hook cannot leave the load, and the throat opening must be within shape. A hook that has opened, twisted or lost its latch fails the sling regardless of how perfect the chain is, because the weakest component sets the verdict.

The identification tag closes the inspection. It must state the working load limit, the grade and the sling identity, legibly enough that the next user can rig against real numbers. The result of the examination is recorded in the register against that identity, and the quarterly colour tag is applied only on a pass.

Storage and Quarantine of Failed Slings

Storage decides how long an inspection stays valid. Chain slings are stored clean, dry and off the ground, hanging where practical so links do not kink or corrode against each other, and away from hot work areas where sparks and heat discoloration wait to happen. Gulf humidity does the rest: coastal stores in Abu Dhabi and Sharjah corrode unprotected chain faster than inland yards, so ventilation and separation from chemical storage matter.

Failed slings need physical control, not just a register entry. A rejected sling is tagged or marked so its status is unmistakable, disabled where site policy requires it, and moved to quarantine away from serviceable gear. The point is to make it impossible for a condemned sling to drift back onto a truck or a hook by mistake.

UAE sites running the quarterly colour cycle apply the next quarter's tag only to slings that passed. Quarantine keeps the failures out of that flow, and the register ties every colour on the rack back to a dated, signed examination.

Checklist

• Lay the sling out clean and inspect link by link along its full length.
• Apply the wear gauge at link bearing points; reject at 10–12 per cent per practice.
• Check pitch elongation and reject stretched links.
• Hang the sling and check it hangs straight, with no twist.
• Look for nicks, gouges, bends and any field welds.
• Check for heat discoloration — blue or black temper colours.
• Examine the master link for wear, cracks and distortion.
• Test hook latch function and check throat opening is within shape.
• Verify the identification tag: WLL, grade and identity legible.
• Record the examination in the register and apply the colour tag on a pass.
• Quarantine and tag any rejected sling immediately.

Related Guides

• Webbing Sling Inspection & Discard Criteria (LEEA Standard)
• Shackle Inspection Guide — Bow vs Dee, Pins, Markings
• Lifting Equipment Inspection Checklist Template (Free)
• Leea Certification Uae