Hydrostatic Testing And Gagging; Manual Popping Of The Valve; Trouble Shooting Guide - Baker Hughes Consolidated 19000 Series Instruction Manual

XVI. Setting and Testing (Contd.)
J. Hydrostatic Testing and
Gagging
When hydrostatic tests are required after installation of an
SRV, remove the SRV and replace it with a blind flange or
pipe plug/cap. If the hydrostatic test pressure will not be
greater than the operating pressure of the equipment, a test
gag may be used. Very little force, i.e. finger-tight pressure,
on the test gag is sufficient to hold hydrostatic pressures.
Too much force applied to the gag may bend the spindle and
damage the seat. After a hydrostatic test, the gag must be
removed and replaced by the sealing plug furnished for this
purpose (see Figure 17). (Test gags for Consolidated SRVs
can be furnished for all types of caps and lifting gears.)
K. Manual Popping of the Valve
Consolidated safety relief valves are furnished, when so
ordered, with packed or plain lifting levers for hand popping.
When the valve is to be opened by hand using the lifting
lever, the pressure at the valve inlet should be at least 75
percent of the valve's set pressure. Under flowing conditions,
the valve must be fully lifted from its seat, so that dirt,
XVII. Trouble Shooting
Problem
a. Damaged seat or O-ring
b. Bearing point damage
Valve leaking
c. Part misalignment
d. Discharge stack binding on
a. Line vibrations
Simmer
b. Lapped seat too wide
a. Improper installation or valve
Chatter
b. Built-up back pressure
No action; valve
does not go into
Foreign material trapped between
full lift; valve does
disc holder and guide
not close from
full lift.
© 2020 Baker Hughes Company. All rights reserved.
Table 15: Trouble Shooting Guide
Probable Cause
outlet
sizing
Gag Bolt
Cap
Adjusting Screw
Locknut
Figure 17: Typical Cap with Gag
sediment and scale will not become trapped on the seating
surfaces. When allowing the valve to close under flowing
conditions, completely release the lever from maximum lift to
snap the valve back on its seat.
Since, in some cases, the dead weight of the lever may have
a tendency to lift the valve disc, the lever should be hung,
supported or counter weighted so the lifting fork does not
contact the release nut.
Corrective Action
a. Disassemble valve, lap seating surfaces, replace disc or O-ring
(if required) as outlined in this manual
b. Grind and polish
c. Disassemble valve, inspect contact area of disc and base,
lower spring washer or spindle, compression screw, spindle
straightness, etc. as outlined in this manual
d. Correct as required
a. Investigate and correct cause
b. Rework seat as specified in this manual
a. Check for piping instructions; check required capacity
b. Check outlet piping for flow restrictions
Disassemble valve and correct any abnormality as outlined in this
manual. Inspect system for cleanliness.
Consolidated 19000 Series Safety Relief Valve Instruction Manual
Sealing Plug
and Gasket
Spindle
Adjusting Screw
| 37