|
| |
TM 5-3825-220-13&P
6-3.8 Aluminum Pipe - Cont'd .
"W"
2. Check switching manifold support system. Piping should be supported continuously on the ground or at
minimum 6 ft. intervals. Correct faults found or initiate maintenance.
"W"
3. Clean dirt off system.
6-3.9 Flanged Connections
a.
There are numerous flanged connections throughout the facility. The bulk of the connections are in 6-inch valve
assemblies. Aluminum flange and gasket dimensions are shown in Fig. 2-58A and 2-58B. Fig. 6-17 shows how a
flanged connection is made up.
b.
Preventative maintenance practice is:
W"/"V" 1. Inspect all flanges routinely or when leakage is noted. Check that all bolts are in place and tight. If not tight,
tighten them. Observe any indication of cracks in flange or in the weld. Note any warpage. Report same for corrective
maintenance action.
"W"
2. Clean off system.
6-3.10 Aluminum Gate Valves
a.
There are numerous 150 psig rating flanged aluminum gate valves in the system as fully described in Chapter 2,
para.'s 2-5.3a, b, c, d, f, and n. Additional information is furnished in Appendix A. Maintenance practice is the same
regardless of size. A cross sectional view identifying the parts and nomenclature is shown in Fig. 6-19.
b.
Preventative maintenance practice is:
"D"
1. Inspect all valves routinely or when leakage is noted. Take the following action:
a.
If stem packing gland is leaking, take up on the gland nut.
b.
If this does not stop leakage, initiate and schedule corrective maintenance.
WARNING
Do not attempt to repack or add packing to a valve under pressure. Depressure unit and
repack in the line or depressure unit, remove, and replace it. Repack out of the line.
b.
Observe any cracks or warpage and initiate removal from the system.
c.
If leakage shows at flanges tighten flange bolts. If this doesn't stop leakage, initiate corrective maintenance.
d.
If leakage shows at bonnet flange, initiate corrective maintenance if tightening bonnet bolt does not stop it.
e.
Check the operability of the valve. If faulty, initiate corrective maintenance.
"W"
2. Clean up valve.
6-10
|
