Consolidated 2700 Series Safety Valve Instruction Manual
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© 2022 Baker Hughes Company. All rights reserved.
XV. Setting and Testing (Cont.)
k) Once the lower adjusting ring is at seat level
it can be preset to the beginning test position
by moving the adjusting ring down one notch
for each 600 psi (41.37 bar) or part thereof.
(Example: 1,000 psi (68.95 bar) Set Pressure
= 2 notches.)
l) Replace the adjusting ring pin in the valve to
hold the lower adjusting ring in position without
binding.
5. Wire the adjusting ring pins together to prevent
them from loosening and vibrating out under
pressure.
6. Replace the service port plugs.
7. Remove the gag from the valve to be tested, and
reinstall the cap and lever assembly on the valve.
8. Now the valve is ready for steam testing.
D. Steam Testing Instructions
1. Attach a rope to the lifting lever on the valve to be
tested.
2. Increase the boiler pressure at a rate not to
exceed
2 psi (0.14 barg) per second. Note and record the
pressure indicated on the pressure gauge when
the valve “pops” open. After the valve pops open,
reduce the fire in the boiler and lower the pressure
until the valve closes, note and record the
pressure when the valve closes. If in raising the
boiler pressure, the valve doesn’t open within 3
percent overpressure (for ASME Section I valves),
or 10 percent overpressure (for ASME Section
XIII (UV Designator valves), reduce the fire in the
boiler and pull the rope to open the valve.
3. Determine if the valve popping point and reseating
points comply with the ASME requirements for
valve operation as recorded in Table 10. (See
ASME Boiler and Pressure Code Section I, or
Section XIII (UV) Valve Operation Standards for
more details). To determine which standard to use,
look at the nameplate on the valve. The symbol
that is present on the nameplate will indicate the
proper standard of operation. (See Table 11.)
4. If the valve operation is in compliance with the
standard, proceed to step 7.
5. If the valve is not in compliance, reduce boiler
pressure to approximately 85 percent of valve set
pressure. GAG the safety valve being adjusted.
a) If set pressure is out of compliance turn
the compression screw one sixth of a
turn (clockwise to raise set pressure, and,
counterclockwise to lower set pressure).
Retest, and note the change in set pressure
for one sixth turn, then calculate the number of
turns needed to bring the set pressure to the
desired pressure. Adjust as necessary.
b) If the blowdown is excessive, raise the upper
adjusting ring (five to 10 notches). If the
blowdown is insufficient, lower the upper
adjusting ring (five to 10 notches). Re-test
as in step 2, if the blowdown is not within
specification repeat step 5.
6. Remove the gag, and repeat Step 2, raising the
pressure until the valve pops, then proceed with
the following steps until the subject valve is in
compliance with the appropriate standard.
7. After one pop has been determined to be in
compliance, test the valve two more times for
consistency of set pressure and blowdown.
Allow a minimum of 10 minutes between pops.
If the operation remains in compliance with
the standard, reduce the boiler pressure to
approximately 85 percent of the set pressure and
seal the valve cap and adjusting ring pins.
8. Proceed to the next valve to be tested.
9. When all valves have been tested and sealed,
return the boiler to normal operating pressure
(Table 12).
