sling inspection procedure

REV. DATE DESCRIPTION

0 05 Mar 09 Original Issue

PJ

P.T. CENTRAL JAVA POWER

SUMITOMO CORPORATION

TANJUNG JATI “B” EXPANSION

COAL-FIRED POWER STATION PROJECT13 SHEETS INCLUDE COVER UNIT 3&4 2x660MW(NET)

MES-TSW JOINT OPERATION

(MITSUI ENGINEERING & SHIPBUILDING CO., LTD.)

PM TITLE

DPMSL IN G IN S PE CT IO N PRO CE DU RE

SGM

SM

ORIGINATOR

I Gede SumantraMES JOB NO. MES DWG. NO.

HB8229 EB-STM-SF0001 0

SCALE

N.A

DATE

05 Mar 09

MES - TSWJOINT OPERATION

SLING INSPECTION PROCEDUREProject : TJB Exp. Unit 3&4Ref : EB-STM-SF0001Date : 05 March 2009Rev. : 0

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Table of Content

I. General..................................................................................................... 2

II. Scope........................................................................................................ 2

III. Regulation and Reference ........................................................................ 2

IV. Wire Rope Sling Requirement ................................................................. 2

V. Safe Working Load and Load Test .......................................................... 3

VI. Sling Identification................................................................................... 4

VII. Sling Inspection ....................................................................................... 4

VIII. Sling Storage............................................................................................ 5

Attachment – Sling Inspection Sheet................................................................... 6

Attachment – Table 3.21...................................................................................... 7








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I. General

Every slings and its accessories utilized to lift up, lift down, or to hang

particular objects must be made from material with proper quality and sufficient

strength to hold working load that effected by the object.

Sling and its accessories must be used in proper way and to be maintained in

such manner to avoid defect as twist, kink, broken wire, and any other defect.

Sling and its accessories must be inspected and tested periodically to ensure

them safe to be used.

II. Scope

This procedure is covering inspection for lifting slings being used in our

project and is in effect to all subcontractors under MES-TSW Joint operation. This

procedure is intended for wire rope sling inspection only.

III. Regulation & Reference

a. Labour and Transmigration Minister Regulation No. Per-05/MEN/1985

regarding Lifting and Transporting Equipment.

b. Labour and Transmigration Minister Regulation No. Per-01/MEN/1980

regarding Safety & Health at Building Construction.

c. Manual Rigging. Sri Widharto. Pradnya Paramita. Jakarta. 2003

d. Rigging and Lifting Course. PT. Industrialindo Konsultrain Service.

Jakarta.

IV. Wire Rope Sling Requirements

There are six requirements to be considered prior usage of wire rope sling:

1. Wire rope must have sufficient strength to hold maximum load lifted.

2. Wire rope must be able to cope with repeated bending movement without

any failure of wire caused by fatigue.

3. Wire rope must resistant to attrition / abrasion.

4. Wire rope must be able to cope with distortion and crushing.

5. Wire rope must be able to cope with rotation.



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SWL = diameter of sling x diameter of sling x 8 ton

6. Wire rope must be resistant to rust.

V. Safe Working Load & Loading Test

Safe Working Load (SWL) is commonly stated by the manufacturer in the

sling certificate. In case manufacturer in any reason did not able to issue sling

certificate it is necessary to call for authorized third party to do loading test and

issue certificate for the sling.

If in case not possible to call for third party, field load test must be carried out.

Some formulas to help field load test are presented below.

Safety Factor

In order to prevent failure of sling during operation, safety factor need

to be applied. Safety factor of wire utilized for lifting material is 5 while safety

factor of wire utilized for lifting personnel is 10. Maximum Save Working

Load can be calculated with the formula:

(Breaking Strength of Wire Rope)Maximum Safe Working Load =

(Safety Factor)

(Breaking Strength of Wire Rope) Maximum Safe Working Load =

5

Example: Certificate of wire rope declares Breaking Strength of Wire Rope 10

tons, the Maximum Safe Working Load will be 10/5 tons = 2 tons.

Safe Working Load

General formula to calculate SWL is rule of thumb.

Note: diameter is in inch



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SWL of wire rope sling can also be calculate using Table of Safe

Working Load refer to CSA G4-1967 Steel Wire Rope – General Purpose as

attached.

VI. Sling Identification

All sling utilized for lifting sling shall be with clear identification.

Identification tag shall be posted at one end of sling with information about Sling

Number, Sling Diameter, and Safe Working Load (SWL). Identification tag must

be easily seen and recognized. Replace identification tag with new one if it

broken.

VII. Sling Inspection

In order to ensure sling proper to use, weekly sling inspection shall be carried

out by all subcontractor. Inspection to be carried out thoroughly spread all over

total length of sling. Inspection of sling is carried out manually and visually.

There will not be laboratory or sophisticated equipment to be used during the

inspection. Check lists used during inspection are as follows but not limited to:

- Is there any twist on sling?

- Is there any broken wire on sling?

- Is there any kink on sling?

- Is there any deformation on sling?

- Is there any rust on sling?

- Is there any defect to hook?

- Is there any defect to shackle?

Result of inspection shall be noted on Weekly Inspection Report and to be

signed by safety officer. Copy of Weekly Inspection Report shall be submitted to

MES-TSW Joint operation every week. Sling Inspection Form is attached.

In case Weekly Inspection Report showing defect sling exceeding tolerance

level, the defect sling shall not be used in operation.

Wire rope sling shall not be used if there is total defect as follow:

a. 12% defect of wire rope 6 x 7 from total length 50 cm



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b. 20% defect of wire rope 6 x 19 from total length 50 cm

c. 25% defect of wire rope 6 x 37 from total length 50 cm

d. 25% defect of wire rope 6 x 61 from total length 50 cm

VIII. Sling Storage

While not in use sling must be stored in roll shape and to be placed in dry

clean area (indoor). In case sling must be stored outdoor means to protect sling

from water, steam / vapour, impact, and in other chemical or mechanical

disturbance must be provided. Keep away sling from any heat sources. Do not

place sling directly on the floor to avoid sling from rusting.

Periodic maintenance and inspection for sling in store must be carried out to

ensure sling in safe condition.



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sling inspection procedure

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