|
| |
TM 5-3825-220-13&P
6-4.11 Aluminum Pipe-Cont'd
1.
If the pipe is scored or corroded with cuts or pits in the run of the pipe, replacement is recommended.
2.
If the pipe is dented with a distortion of more than 1/4-inch from the original cylindrical shape, replacement
is recommended.
3.
If the grooves are broken over or any crack shows, replacement is recommended.
4.
Replaced pipe may be made usuable in shorter sections by cutting off the damaged section and rerolling
the grooves.
5.
It is noted that a proprietary repair clamp is under consideration and test and will possibly be supplied by
Army direction for primary use on the associated pipeline system. These clamps may be used to repair leaks or breaks of
limited size in the run of the pipe without removal of the pipe from the system.
6-4.12 Flanged Connections
The pipe must be round and not badly deformed for the effective use of the repair clamp. Pipe repair clamps are not
supplied with the TPT proper.
a.
Flanged adapters are generally used on flanged valves to adapt to quick disconnect camlock couplings or to
grooved couplings in the hose system. Standard flange and gasket dimensions are shown in Fig.'s 6-15 and 6-16.
Typical flange make-up criteria is shown in Fig. 6-17.
b.
It is noted that aluminum flanges and the mating flanges, whether aluminum or steel, must be flat-full faced.
That is, no raised faces. The gasket must be full faced. This is due to the strength characteristics of aluminum and to
avoid warpage and overstress of the. flange and its welds. In assembly make-up, it is recommended that the flange bolts
and nuts be torqued to 30 ft. lbs. + 3 lbs. In any case, the flange bolts must be tightened evenly by tightening a nut
approximately opposite the other until all bolts and nuts are tightened evenly.
c.
Recommended corrective maintenance actions are:
1.
If flange leaks slightly, first try to stop the leak by tightening the flange bolts.
2.
If this does not stop the leak, disassemble the flanged connection, inspect and repair or replace as follows:
a)
If the gasket is broken, bent, or crushed, replace it.
b)
If the flange face is scored to a depth of less than 1/64 inch, it can be faced off (one time) in a
qualified and properly equipped shop. If such facilities are not available, the flange and any integral equipment (such as
a valve) should be replaced. The faulty items should be passed up thru maintenance channels for disposition.
c)
If the flange is scored to a depth deeper than 1/64 inch or the flange is warped, it should be replaced.
The faulty equipment item should be passed up thru maintenance channels for disposition..
6-19
|
