JUBILEE PIPE PATCH
necessary. Do not drive the plugs and wedges in too far
or else they will retard the flow of the fluids in the pipe.
The jubilee pipe patch (fig. 8-21) is a modification
Once the plugs and wedges are in place, trim them off
of a commercial hose clamp. Periodically, you may
flush with the outside surface of the pipe. Cover the
purchase heavy-duty jubilee pipe patches through the
damaged area with a piece of rubber that will
supply system. However, if you cannot purchase them,
completely cover and extend about 2 inches past the
you can manufacture them yourself.
damaged area on all sides. Use two tightly wound
layers of marlin or wire to hold the rubber in place.
THREE TYPES OF CLAMPS
SHEET METAL COLLAR
CUT OFF PLUGS FLUSH
DRIVE IN SOFT WOOD
WITH PIPE. DO NOT SET
PLUGS COVERED WITH
THE PLUGS TOO FAR
BIND WITH MARLIN
WRAP WITH SHEET
BY LIGHT SHEET
ENDS OF CRACK 2".
Figure 8-22. Soft patch on a low-pressure pipe line.
Figure 8-21. Jubilee pipe patches.
The soft patch can be modified or improved to suit
To manufacture a jubilee pipe patch, roll a piece of
the conditions at hand. Often it is advisable to use a
sheet metal into a cylinder. Bend a tab on each edge to
curved piece of lightweight sheet metal between the
form a flange. The flanges may be reinforced by
rubber and the marline or wire. A coat of red lead on the
welding on strips of scrap iron. Drill three to five holes
face of the rubber will help and you can use marlin and
through both flanges for the securing bolts. To keep the
oakum as a caulking material in the cracks.
flange faces somewhat parallel when under pressure,
weld small braces from the flanges to the back of the
The Emergency Water-Activated Repair Patch
patch. Use a thick gauge sheet metal that will withstand
(EWARP) shown in figures 8-23 and 8-24 is a unique
pressure but can also be sprung open enough to be put
and easy to use pipe patch that can be used on many
over the pipe.
piping systems. The EWARP comes in a clear plastic
To use the jubilee pipe patch, put a piece of rubber
package that includes a foil package containing the
or gasket material over the hole. It should be large
instant repair resin coated cloth and a pair rubber
enough to cover and overlap the damage at least
gloves. The patch comes in two different sizes; size
2 inches on all sides. Slip the jubilee pipe patch over the
1 which is 3 inches by 9 feet and size 2 that is 4 inches
rubber or gasket material. Insert the bolts into the holes
by 15 feet. Maximum operating pressure is 150 psi.
and secure them in place. The jubilee pipe patch can
withstand 100 pounds of pressure.
Normal operating temperature should not exceed
300 degrees Fahrenheit. The syntho-glass patch must
be firmly wrapped around the damaged area extending
several inches. If needed, the excess can be cut with a
Small holes or cracks in low-pressure (150 psi)
knife. The patch can also be sanded and painted. The
piping can often be repaired by applying a soft patch
EWARP is fully hardened in 30 minutes and complete
(fig. 8-22). When it is possible, reduce the area of the
hole first by driving in softwood plugs and wedges as
function of the system can be resumed.