Job & certificate

Customer / client

Order / job number

Sling code

Customer ID

Certificate number

Sling ID number

Date of test

Standard/s

Sling

Sling type

Nominal working length [m, bearing to bearing]

MBL [t]

Design factor [DF]

Eye length A [m]

Eye length B [m]

Test & load

Type of test

Load applied [t]

Cyclic loading [count]

Connection

Graph required

Pin diameters

Test pin 1 Ø [mm]

Test pin 2 Ø [mm]

Working pin 1 Ø [mm]

Working pin 2 Ø [mm]

Test pins are the diameters physically used on the rig. Working pins are the customer connection diameters the sling will run on — the length is corrected off the first and onto the second.

Length & tolerance

Measured length [mm, on test pins under load]

Length tolerance [±%]

Remarks

Method

The sling is measured girth-wise over two test pins. The loop (circumferential) length is recovered from the measured span m with a half-wrap correction on each test pin of diameter D: C = (2m − D₁ − D₂) + (π/2)(D₁ + D₂).
That loop is re-seated on the two working pins (diameters d₁, d₂; radii r₁, r₂). The clear half-span between them is s = ½[ C − (π/2)(d₁ + d₂) ].
Unequal working pins sit their bearing points at different heights, so the straight run is the Pythagorean leg and the effective length adds the two working radii back: L = √(s² − Δr²) + r₁ + r₂, with Δr = r₁ − r₂.
Deviation is (L − L_nom) / L_nom, and the sling conforms when it lands inside ± tolerance.

Hand-check: with equal test and working pins (all = d), the chain reduces to L = ½(C − πd) + d.

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Precis-ion Length Measurement

Round sling — Precision Length Acceptance (PLA) certificate

Cert — · Sling ID — · Test —

General details

Customer / client

—

Order / job number

—

Sling code

—

Customer ID

—

Standard/s

—

Sling type

—

Sling

Nominal working length

—

Eye length A / B

—

Min. breaking load (MBL)

—

Design factor (DF)

—

Working load limit (WLL)

—

Load applied

—

Test parameters

Type of test

—

Connection

—

Test pin 1 / 2 Ø

—

Working pin 1 / 2 Ø

—

Cyclic loading

—

Graph required

—

Measurement results

Measured length (test pins)

—

Circumferential length

—

Effective length (working pins)

—

Deviation from nominal

—

Nominal length

—

Tolerance

—

Min. acceptable

—

Max. acceptable

—

Remarks

—

Inspector / Operator

Reviewed by

Approved by / Date

Franklin Offshore International Pte. Ltd. — NEXUS Synthetics Precis-ion Length Measurement v2.4 · Printed Page 1 of 1