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XII. Recommended Installation Practices (Cont.)
Vessel
itself. This is particularly important on long distance lines.
A continual oscillation of the discharge piping (wind loads)
may induce stress distortion in the valve body. The resultant
movement of the valve's internal parts may cause leakage.
Where possible, use properly supported drainage piping to
prevent the collection of water or corrosive liquid in the valve
body.
In every case, the nominal discharge pipe size should be at
least as large as the nominal size of the POSRV outlet flange In
the case of long discharge piping, the nominal discharge pipe
size must sometimes be much larger.
D. Remote Sensing
If the pressure drop between the source of pressure in the
equipment to be protected and the pressure at the relief valve
inlet exceeds 3%, the sensing line to the pilot valve should
be connected directly to the equipment being protected.
The optional sensing ring should not be installed. For remote
sensing, .375" (9.53 mm) diameter tubing is adequate for
distances up to 10 feet, (3.048 mtr). If distance is longer than
10 feet (3.048 mtr), please contact BHGE's Consolidated
Products Application Engineering.
ATTENTION!!
Change in elevation between relief valve and source of
sensing line may cause set pressure changes.
© 2019 Baker Hughes, a GE company. All Rights Reserved.
Cap may be
required
for weather
protection
Long-Radius
Elbow
Vessel
Figure 7: POSRV Parts Alignment
Attach stack rigidly to structure. Do not
connect to drain pan or the discharge piping.
Stack
Drain
Pan
Pan Drain
Long-Radius
Elbow
Vessel
For block valve and other special installation features consult
API 520 or the factory.
E. Freeze Protection
Type of Applications:
1.
Applications where the process media, in the liquid state,
has a freezing point between the ambient temperature
limits of the local region.
2.
Steam service applications where the pilot operated
valve is exposed to the climate, extreme cold ambient
Insulation
not required
for Bonnet
and Cap
Pilot Valve
Base
Accessories
(I.E. Filters)
Figure 8: Pilot Operated Safety Relief Valve
Consolidated 2900-40 Series POSRV Maintenance Manual | 23
For a closed system, speci c
care must be taken to keep
piping strains away from the
pressure relief valve under all
conditions of process
operation and temperature.
All Tubing
Main Valve
Base
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