es una prueba de de medicion para conocer el estado de la cementacion
TANK BOTTOM & SHELL PLATE JOINT LEAK TEST PROCEDUREFull description
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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
R E V
P’PD
C’KD
REVIEW
29-12-2009
KQKS/Site_Con-P-04 KQKS/Site_Con-P-04
Tank Vacuum Leak Test
0
ESE
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TLP/TPM/RNZ 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 a ccordance 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 pla te.
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
