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6. Slowly open the shut-off valve in the re-
turn flow pipe after the valve has been
installed.
7. Slowly open the shut-off valve in the flow
pipe.
8. Check the valve to ensure it functions
properly and that there is no leakage.
6.1.3
Pressure test
All plant components must be designed for
the test pressure.
Observe the following on pressure testing the
regulator:
− Remove the regulator from the pipeline
for pressure testing the plant.
OR
− Fully open the restriction of an installed
regulator before pressure testing the
plant.
− Slowly open the shut-off valves, starting
with the shut-off valve in the return flow
pipe.
NOTICE
!
Risk of valve damage due to a sudden pres-
sure increase and resulting high flow veloci-
ties.
− Slowly open the shut-off valves.
NOTICE
!
Risk of damage to the regulator due to im-
permissible excess pressure.
EB 3135-1 EN
The test pressure must not exceed the pres-
sure rating by 1.5 times on testing the pres-
sure of the plant when the regulator is in-
stalled. Do not pressurize the diaphragm
from one side.
Note
The plant operator is responsible for per-
forming the pressure test. SAMSON's Af-
ter-sales Service can support you to plan
and perform a pressure test for your plant.
6.1.4
Leakage
The plant operator is responsible for per-
forming the leak test and selecting the test
method. The leak test must comply with the
requirements of the national and internation-
al standards that apply at the site of installa-
tion.
Tip
Our after-sales service can support you to
plan and perform a leak test for your plant.
1. Slowly open the shut-off valve installed
upstream of the regulator.
2. Apply the required test pressure.
3. Check the regulator for leakage to the at-
mosphere.
4. Depressurize the pipeline section and
valve.
5. Rework any parts that leak and repeat
the leak test.
Start-up and operation
29
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