Скачать или смотреть Boiler accumulation of pressure test II How its done ? Boiler accumulation test Procedure II

Boiler accumulation of pressure test . How its done ? What is accumulation pressure?
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1. Shut off feed water
2. Close main steam stop valve.
3. Increase cut off pressure of boiler.
4. Bypass high pressure cut off of the boiler.
5. Arrange the boiler fire rate to a maximum.
6. Safety valve will be lift during the test.
7. The test is carried out as long as the water permits in the boiler.
8. Accumulation pressure should not exceed 10% of working pressure in the specified time.
9. Specified time is 15 mins for a smoke tube boiler and 7 mins for water tube boiler.

Boiler Accumulation Pressure Test


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1. What is Auxiliary Boiler Accumulation Test?

Test to check whether the safety valve capacity is suitable for the boiler.

As per classification society:

15 minutes for fire-tube boilers

7 minutes for water-tube boilers


Stop valves closed, boiler under full firing condition.

Requirement: Boiler pressure rise must not exceed 10% of design pressure.

Only minimum feed water supplied to maintain safe water level.



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2. Purpose of Accumulation Pressure Test

To verify safety valve capacity.

Ensures the valve is suitable for the boiler.

Limits rise in boiler pressure under full firing conditions.



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3. Why Accumulation Pressure Occurs?

Occurs when safety valve lifts.

Boiler pressure continues to rise due to:

Increased loading

Further compression of valve spring.




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4. When is the Test Carried Out?

Conducted when:

New boilers are installed.

New safety valves are fitted.

After major boiler/safety valve repairs.




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5. Procedure of Accumulation Pressure Test

1. Close boiler main stop valve.


2. Supply only minimum feed water required to maintain safe water level.


3. Increase cut-off pressure of boiler and bypass HP cut-off.


4. Safety valve will lift during the test.


5. Continue for:

15 minutes (fire-tube boiler)

7 minutes (water-tube boiler)



6. Verify that pressure rise does not exceed 10% of design pressure.




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6. Key Points

Confirms safety valve effectiveness.

Ensures boiler operates safely under full firing.

Mandatory as per classification society requirements.