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 Preventive Maintenance Checks and Services
Table 2-1.
Q - Quarterly
S - Semiannually
A - Annually
D - Daily W - Weekly M - Monthly
Items To Be
Interval
Item
Procedures
Inspected/
No.
D
W
M
Q
S
A
Serviced
PIPING SYSTEM
Open drain valve and let water run until clear.
Hot Water
Heater
Check temperature and pressure relief valve (to ensure
proper operating condition).
Inspect piping systems for cracks, pitting, corrosion,
Piping
q
scale, broken or thin pieces in the piping including
Systems
welded joints, screwed fittings, expansion joints, and
watertight bulkhead fittings.
a. Lubricate bearings and stem threads using a high
Valves
q
pressure and temperature lubricant (Dow Corning
Molykote G-N paste or equivalent).
Check torque on bolted bonnet valves and gland bolts.
b.
Torque in
ft-lb
Valve Site
Bolt
Site
20 *
5/16
- 18
1/4" - 3/8"-1/2"
18 -
30 *
- 16
26 -
3/4"
3/8
- 13
65 -
75
1"
1/2
1-1/4" - 1-1/2"
100 -
115
9/16
- 12
140 -
150
2"
- 11
5/8
Full Port - Gate Valves
1/4" - 3/8"
18
-
20 *
5/16 -
18
1/2"
3/8 -
16
26
-
30 *
3/4"
1/2 -
13
65
-
75
100
-
115
1" - 1-1/4"
9/16 -
12
1-1/2"
5/8 -
11
140
-
150
* May be increased 10 ft-lb if necessary.
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