| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-223-SDC
i. Renewing piping. If the pipe has been badly holed or ruptured, patching may not suffice and it may
be necessary to renew a section. It is advisable to carry spare sections of the smaller sizes of important
pipe. In an emergency, it may be possible to remove a section from an unimportant system to use where the
need is more urgent. If the original pipe was fitted with screw flanges, remove the entire damaged section, cut
screw threads on the new piece, screw the flanges onto the new piece, and install it. The flanges are bolted
together. To renew only the damaged part of a small pipe, cut out the damaged area with hacksaws, and cut
a piece of pipe almost the same length as the gap. Cut screw threads on all exposed ends of pipe and make
up the joints by using pipe unions and couplings. Cut the filler piece short enough to permit inserting the pipe
fittings. White lead may be used on screw threads to seal the joint.
Unions may be improvised similar to the soft patches previously described. If the joints are not held together,
they may be pushed apart by pressure reaction. It is advisable to force the joints together by means of lines,
shores, or wedges.
j. Metal clamping tool. The metal clamping tool, usually referred to as the band-it clamp, has many
uses in the repair of piping. It is comparatively simple to operate and produces a very effective repair when
applied as indicated in FIGURES 8-7 and 8-8.
The metal clamping tool is supplied in a kit which consists of the following items:
(1) Steel bands in 100-ft. lengths, and in widths of 3/8-inch (breaking strength 900 pounds) to 3/4-inch
breaking strength 2400 pounds).
(2) The metal clamping tool which tightens and cuts the steel bands.
(3) Steel buckles.
(4) Strongbacks-2-inch, 3-inch and 4-inchpipe.
k. Blanking lines. Ruptured pipe lines often are a menace because they cannot readily be isolated and
continue to perform a vital function within the piping system. In the case of firemains, the choice may lie
between flooding a compartment or extinguishing a fire. Frequently, in the case of oil lines, important and
undamaged machinery must be secured. Such problems have been solved by blanking off part of the pipe
line. Low-pressure pipe lines often can be blanked by driving wooden plugs covered with cloth.
Unsupported, these plugs have a tendency to back out. Adequate support generally can be provided by
using shores or jacks, or by drilling a hole through the pipe and pinning the plug in place. For frayed ends of
pipe cut by fragments, combinations of plugs may be desirable. When the damaged pipe is joined by screw
fittings, it is a simple matter to unscrew the damaged part and to stop the flow of fluid by means of a pipe cap
or a pipe plug.
8-15
|
||
|
||
