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 TM 55-1905-223-SDC
This buildup in patch length during applications must be considered initially in determining the length
of patch to be applied. Where practical, allow the patch to extend 4 to 5 inches on each side of the rupture.
With a severed pipe, the length of the patch must be considered to be longer than in the case of a simple pipe
patch.
8-18.
QUANTITY OF MATERIAL REQUIRED. After the decision has been made as to the type and
size of the patch to be applied and the pipe has been prepared, the following formulas can be used to
determine the quantities of basic materials that will be required.
R - WR x 2
WR - C x 4
where: R - Active resin (grams)
WR - Woven Roving (in square inches)
C - Circumference of pipe
Note: The width of WR-length of patch
FLAT PATCH (LIQUID).
The simple flat patch is approved for making plastic repairs to ruptures
8-19.
in metallic and nonmetallic surfaces.
Ruptures up to and including 12 inches in diameter, or square, successfully can be repaired by
using procedures similar to those employed in making pipe repairs. For ruptures more than 6 inches in
diameter, the patch overlap should increase 1 inch for each inch of increased diameter. The greater the
overlap, the larger the area to which the patch will adhere and thus increase the total strength of the patch.
Patch Size for 12-Inch Hole.
8-22
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