In
order to contain pressures above 25 psi, it is necessary to use a
metal mold. PLCS designs these on our CAD system. They are usually
custom fabricated from steel in two halves, which are bolted together
on the pipe. The sealant is mixed and poured into the mold. The mold
is capped and then pressurized with bottled nitrogen to above mains
pressure. A gauge registers the sealant pressure. The nitrogen pressure
is left on for 24 hours and then the mold is removed. The steel mold
belongs to the customer and is reusable many times. With a little
care it will last many years. The whole operation is very simple and
easy to learn by your own employees. Field technicians are available
for on-site instruction and supervision.
