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TANJUNG LANGSAT PORT

SDN BHD

Tank Vacuum Leak Test

THE ENGINEERING, PROCUREMENT, CONSTRUCTION AND COMMISSIONING (EPCC) OF GASOLINE TANKS (RECONSTRUCTION) FOR

TANJUNG LANGSAT PORT OIL TERMINAL

JOB NO: JN0901

DATE DOC NO DESCRIPTION REV

P’PD C’KD REVIEW

29-12-2009 KQKS/Site_Con-P-04 Tank Vacuum Leak Test 0 ESE KQKS TLP/TPM/RNZ

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TABLE OF CONTENTS

1. INTRODUCTION……………………………………………………………………… 3

2. GENERAL………………………………...………………………………………….… 3

3. TESTING………………………………..……..…………………………………….….. 3

4. ATTACHMENT…………………….……………………………………………….…... 4

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1. INTRODUCTION

This procedure is established to test the weldment of bottom plate for the storage tank to

ensure that the tank bottom is free from leaks before carrying-out the hydrostatic test.

2. GENERAL

This test shall be carried out by using vacuum box. The vacuum box is fitted with a glass

viewing panel on its top and has an open bottom, around which a continuous rubber gasket

seal and former are secured. The seal forms an airtight joint around the section of the weld to

be tested when the box is pressed against the bottom plates. A soap film solution or

commercial leak detection solution applicable to the conditions shall be used. A typical vacuum box is illustrated as in Attachment - I.

3. TESTING

3.1 Vacuum Testing shall be performed in accordance with API 650

3.2 Removal of welding slag and wire brush cleaning of weldseam prior to testing.

3.3 Apply soapsuds on the weld seams to be tested and position the vacuum box on the

weld seam.

3.4 A partial vacuum of 6 inHg to 10 inHg is then created by means of compressor air.

The vacuum shall be maintained when view the area under test through the top

viewing glass.

3.5 Release the vacuum if the weld seam found satisfactory during testing.

3.6 The Vacuum Box Test shall have at least 50mm overlap of previously viewed surface

on each application.

3.7 If leak is detected during testing, repair shall be carried-out and followed by retesting

on that particular section of weldment.

3.9 Testing shall be carried-out continuously section by section until completely cover all

the weldment for bottom and annular plate.

3.10 Oil penetration test can be carried out in lieu of vacuum test for shell to bottom plate

welds.

3.11 Applying high flash point penetrating oil such as diesel to either side of initial weld

pass of Shell to bottom plate joint, letting stand for at least four hours, and examining

the weld for sign of leakage.

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4. ATTACHMENT

4.1 Typical Vacuum Box for flat weld & corner weld

– Attachment - I

4.2 Vacuum Box Test Report

– Attachment - II

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Attachment – I

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Attachment – II

See attached Vacuum Box Test Report