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PROCEDURE FOR CARD BOARD BURSTING / AIR

BLOWING

1. OBJECTIVE

To clean the permanent and temporary pipes being erected by

cardboard bursting with compressed air.

2. PROCEDURE

Items such as control valves, flow measuring elements, orifices,

NRV flaps etc which are likely to get damaged during air

bursting or which may restrict the flow during the process

should be removed and spool pieces erected in place. The

removed fittings are stored with proper identification tags.

Availability of air compressor with sufficient capacity is

ensured.

A pressure gauge of !" kg#cm$range is installed in the line

near air supply connection.

%ne end of the pipe system to be cleaned is fitted with suitable

arrangement for connecting compressed air hose and a dummy

cardboard is fi&ed at the other flanged end.

The system is pressuri'ed with compressed air up to ( ! )

kg#cm$.

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*udden release of air at very high velocity due to rupturing of

cardboard causes removal of foreign particles present in the

system.

Thickness of the cardboard should be such that it bursts afterattaining a pressure of ( ! ) kg#cm$.

The air stream coming out of the pipeline during bursting of

card board is observed for presence of any foreign material.

The card board bursting process is repeated using new

cardboard every time till the air stream coming out of the

pipeline is visually clean.

+rouping of pipings is decided at site for ease in carrying out

the cardboard bursting activity.

herever card board bursting is not possible due to constrains

of the system such as non availability of flanged connection forfi&ing cardboard or si'e of pipe being small, the lines are to be

air blown continuously for ) to" minutes.

3. LINES INCLUDED IN PROCESS

All lube oil, -ontrol oil, acking oil and *eal oil lines

/temporary and permanent0 shall be included.

After cardboard bursting of all the systems is completed the

whole system shall be filled with compressed air and all

instrument tapping points /wherever applicable0 shall be blown

one by one keeping air pressure at appro&imately ( kg#cm$.

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4. SAFETY PRECAUTIONS

The area of potential danger should be cordoned off and 1anger

sign boards prominently displayed.

Temporary connections should be able to withstand a pressure

of 2 ! 3 kg#cm$.

hile bursting the diaphragm care should be taken that the air

4et is not directed towards any e5uipment.

5. COMPLETION CRITERIA

-ard board bursting of a section is declared complete once the

stream of air coming out from the pipe is visually clean.