Iot-q-bbb-pr-005 Vacuum Box Test Procedure Rev_a

Subcontractor:

Owner:

OIL TANK STORAGE TERMINAL AT KARIMUN PT Oiltanking Karimun, Indonesia

PT.BANGUN BEJANA BAJA

Contract No – 13B1A25

EPC Contractor:

VACUUM BOX TEST PROCEDURE

Document No. IOT-Q-BBB-PR005 Rev. A, Date : 04-02-2014

Page 1 of 7

PT IOT EPC Indonesia


REVISON

Name

Kind Of Change

Date

Signature

A ACTION

Name

Title

Date

Prepared by PT.BBB

Irfan Hariansyah

ISSUED FOR REVIEW

04-February 2014

Reviewed By PT.IOT Approved By OT

Signature

Subcontractor:

Owner:

OIL TANK STORAGE TERMINAL AT KARIMUN


PT Oiltanking Karimun, Indonesia


EPC Contractor:


Document No.: IOT-Q-BBB-PR -005

Page 2 of 7


REVISION STATUS SHEET

Revision No

Effective Date

A

04-Feb-14

Status

Is ued For Review

Descriptio of Change

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Page 3 of 7


Contents 1.

SCOPE ..................................................................................... ................................... 4

2.

REFERENCE ........................................................................... ................................... 4

3.

EQUIPMENT AND MATERIALS................................................................................. 4

4.

PROCEDURE ........................................................................... ................................... 5

5.

ACCEPTANCE CRITERIA .......................................................................................... 6

6.

REPAIRS.................................................................................. ................................... 6

7.

VACCUM BOX TES SKETCH .................................................................................. 6

8.

Report ...................................................................................... ................................... 7

Attachment (Form Report) .............................................................................................. 7

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Page 4 of 7


1.


SCOPE 1.1. This Procedure contains detail employed by PT BANGUN BEJANA BAJA personnel for carrying out of leak testing welds by the vacuum box method for OIL TANK STORAGE TERMINAL AT KARIMUN Project Project. 1.2. The Vacuum bo testing will be used for testing of welds in the Bottom and Roof only

2.

REFERENCE •

3.

API 650 Eleventh Edition: Welded Steel Tank for Oil Storage

EQUIPMENT AND

ATERIALS

3.1. Leak Detector Solution Use a solution of liquid detergent or liquid soap with water i the proportion of one (1) pint (0.5 liters) f detergent or soap, and four (4) quarts (3.8 liters) of water. Prepare the solution in dvance to allow the bubbles and foam to isperse before using. To prevent the solution from icing in the container, if the ambient temperature is below freezing, add ethylene glycol (antifreeze) to the solution in a proportion of one part antifreeze to ten parts of the solution. Approximately 750 m (30”) of the seam under test is brush ed r sprayed with a soap solution. 3.2. Leak Detector olution Applicator such as a fine orifice garden sprayer, squeeze bottle, oil squirt can, hand operated spray applicat r, or brush.

plastic

3.3. Vacuum Box: T e box shall be constructed to produce and old a pressure differential of at least 8 psi (55 kPa gauge). A gauge shall be placed in the system to verify the required pressu e differential. Keep the transparent windo on vacuum box clean to ensure good visibility while performing the test. 3.4. Dimension of V cuum Box to be used shall be of convenie t size [e.g. 6 in (150 mm) wide by 30 in (7 0 mm) long) with a clear window in the top. 3.5. Flashlight or brig hter light source. 3.6. Clean dry rags r towels.

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4.

PROCEDURE 4.1

Remove all wel slag, mud, dirt, standing water and other bubble formatio from areas to be leak tested.

ebris, which may prevent

4.2

Performing a visual examination of the bottom and welds prior to performing the vacuum box test

4.3

Verifying the co dition of the vacuum box and its gasket seal s.

4.4

Provide adequa e lighting for this examination. For example, daylight or illumination from a standard 3 volt (2 D Cells) flashlight is sufficient.

4.5

If freezing weat er conditions exist at the time of a test, eat the weld joints to be vacuum tested until the metal is slightly warm to the touch in order to thaw any ice that could possibly be plugging existing leaks. Limit the areas h ated to that which can be tested before th metal cools to freezing temperatures.

4.6

Apply the leak detector solution to the welds to be tested in free or bubbles.

continuous film relatively

4.7

Seat the vacuum box. The vacuum box must reach a reading of 3 psi 20 kPa gauge) or larger.

inimum gauge pressure

4.8

Observe the d tector solution as the box is evacuate to prevent overlooking indications of leakage that tend to blow through the soluti n film instead of forming visible bubbles.

4.9

The vacuum sh ll be maintained for the greater of either at l ast 5 seconds or the time required to view the area under test

4.10 The vacuum bo test shall have at least 50 mm overlap of previously viewed surface on each applicat ion. 4.11 The presence of of a bubble or f The presence of response at th repaired and ret

a through-thickness leak indicated by conti uous formation or growth am, produced by air passing through the t hickness is unacceptable. a large opening leak, indicated by a quick bursting bubble or spitting initial setting of the vacuum box is unacceptable. Leak shell be sted.

4.12 A record or rep rt of the test including a statement addres ing temperature and light intensity shall b complete.

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5.

ACCEPTANCE CRI ERIA 

6.

All leaks located y vacuum box testing are unacceptable.

REPAIRS 7.1. After repairs ha e been made, the repaired area shall be etested by the applicable steps in 5.0. 7.2. In addition, the repaired area shall be re-examined by all ther methods originally required for the ffected

7.

VACCUM BOX TEST SKETCH

2" (50 mm) next overlap

2" (50 mm) Overlap for adjacent vacuum box test

6" (150 mm)

Vacuum Box

30" (760 mm) Lap weld joint yang akan diuji 1,5 "

Val e 1/2"

Selang Karet dari Kompressor

Vacuum auge (range 0 -30)

Vacuum Box Lap weld joint yang akan di uji

1.5 " a 30" (760 mm)

roximatel

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8.


Page 7 of 7

Report After completion of Vacuum Box test PT. BBB will prepare the rep rt Vacuum Box test for customer approval.

Attachment (Form Report)

Iot-q-bbb-pr-005 Vacuum Box Test Procedure Rev_a

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