Force
– Two Piece Trunnion
Mounted Ball Valve
Document Number:
Revision:
Release Date:
EDC 514
A
05/09/2022
IOM: Installation, Operation and Maintenance Manual
34/43
2.5
Re-assembly
Refer to Chapter VII for reassembly procedure.
2.5.1.
Valve test and
inspection
Confirm the following items for test and inspection before and after maintenance
operation.
2.5.2. Operation test
(1)
Check smooth operation of valves without galling or sticking of internal valve components.
(2)
Check that the stem is firmly assembled with the ball.
(3)
Ensure that there should be no offset of the ball ports and ball seats at the fully open
position. The ball should not be protruded into the valve port other than the rounded surface
of the ball port edges.
2.5.3 Shell test and seat leakage test
(1)
Care for shell test and seat leakage test.
Wear personal protective gear such as goggles, gloves and working boots.
Before shell test and seat leakage test, take some precautions for operators’
safety.
(2)
Shell test and seat leakage test
All valves should be subjected to a hydrostatic or pneumatic shell test and seat leakage
test at the required test pressures after reassembly.
Refer to API 6D for test methods and procedures.