(1)
Unscrew alt remove first stage safety
valve assembly (6), reducing bushing (7), tubing elbow
(8), and street tee (9).
(2)
Unscrew and remove fourth stage safety
valve assembly (10). Remove tubing elbow (11), street
tee (12), and tubing adaptors (13).
(3)
From the opposite side of the cooler
assembly, unscrew and remove the third stage safety
valve assembly (14), elbow i15), tee (16) and elbow (17).
(4)
Unscrew and remove the second stage
safety valve assembly (18).
adaptor (19) and tee
(20). Remove elbows (21 arid 22)
(5)
Remove six machine screws (23) and
remove fan shroud (24) from air cooler (25).
b.
Cleaning. Refer to paragraph 6-3.a. for general
cleaning requirements.
(1)
Clean outside surfaces of the air cooler
with compressed air, pressurized hot water and
detergent or steam.
(2)
Clean inside of tubing surfaces with I’-D-
(80, Type II.
(3)
After cleaning dry with low pressure
compressed air (30 psi).
c.
Inspection. Refer to paragraph 6-3.b for general
inspection requirements.
(1)
Test safety valves. Connect valve to be
tested to a gauged and regulated 4,000
psig (27,580 KPa) air or nitrogen source.
See Figure 6-5.
Keep unprotected parts of body away from valve
opening during test.
NOTE
Hydrostatic tester may be used in lieu of nitrogen or air
pressure source.
(a)
with zero pressure increase pressure to
valve operating pressure.
Figure 6-5. Typical Safety Valve Test Setup
6-15
