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FRM-22.1 Rev.G
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8. Instructions for
“Optional”
Cooling Flow Between the Seals
8.1. When using the plug to cool the pipe during welding, ensure the check valve is
free from dirt or debris.
8.2. Remove any plug/cap from the front of the shaft , if installed, to allow water to
fl ow freely.
8.3. Use any of the installation methods mentioned in the sections above to install the
plug.
a.
Place plug as far into pipe as possible while still allowing access to the
Fill Port
.
TEMPERATURE NOTE:
If welding is to occur while the plug is inside the pipe then the
Sealing Compression Ring
⑥
must be
at least 12 inches into the pipe or the max allowable beyond the location welding is to occur. USA
Industries
Urethane Seals
can withstand 225° Fahrenheit for short durations. USA Industries’ off ers
extended reach plugs if a longer length is needed for your application.
b.
Install and torque the plug (see Section 6).
c.
Connect a water pump to the
Fill Port / Swivel Pipe Union Fitting
③
.
d.
Water Return and Drain options:
1.
Allow the water to drain freely from the
Return / Drain Port
(see Figure 7). Th is is only
recommended when the plug isn’t subjected to backpressure resulting from chemical vapors
originating beyond the check valve of the vessel that the plug is installed in. (
Th ese vapors
can fl ow by the Check Valve if enough pressure is generated behind the plug to create a 1/3
psi positive-pressure-diff erential originating in the vessel beyond the Check Valve. Under this
condition, the result could expose workers to hazardous chemicals inadvertently from the
vented return water).
2.
Attach a hose to the
Return / Drain Port
(see Figure 7) to direct water into a safe
collection container. Th e hose should be long enough, and the container located far enough
away, that any redirected hazardous vapors exiting the vessel, which may potentially fl ow by
the
Check Valve
due to positive-pressure-diff erential, do not pose any risk to personnel that
may be in the area.
3.
Use a closed loop water chiller to recirculate chilled water. Th e chiller system must be
designed to be used safely with any chemicals that may end up in the recirculation loop
because of the possibility of positive-pressure-diff erential fl owing by the
Check Valve
. Th e
tank of such chiller must be able to vent pressure buildup resulting from fl ow by of the check
valve.
CAUTION: Mixing of chemicals or vapors into the cooling water may occur if the pressure
diff erential is greater on the back of the plug vs the internal pressure created by the fl owing fl uid by
1/3 psi. It may be necessary to contain and discard the water in a method that is in accordance to
site and EPA recommendations.
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