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Copyright ©2022 USA Industries. All rights reserved.
FRM-22.1-Rev.H-SMDBB
•
It may be desirable to attach a gauge and vent hose assembly, backpressure monitoring
tee, to the backpressure
Vent Port(22)
to bleed off any backpressure. The hose should be
long enough to redirect any vapor coming out of the vessel to a safe location away from
workers that may be in the area. A valve may also be attached to this port to allow safe
backpressure removal during plug removal,
Section 8
. If using a backpressure monitoring
tee it may be useful to have a pressure gauge on the bull side of the tee while connecting
the run side to the backpressure
Vent Port(22)
and a ball valve. Further advantages can
be made by attaching a hose to the ball valve on the monitoring tee and running the hose
to vent to a safe location away from workers that may be in the area.
CAUTION:
Fast flowing gases or liquids through hosing can cause hose whip. Take
caution to avoid this, failure to do so may result in injury to personnel or damage to
equipment.
CAUTION:
Do not stand directly in front of the GripSafe ST Double Block and Bleed at
any time. Installed plugs should always be treated in this manner irrespective if the plug
has backpressure on it or not.
CAUTION:
If backpressure develops, constant observation of pressure observed
through the use of an attached gauge and physical observation of pipe integrity is
necessary to ensure safety to personnel and equipment. Any bulging, enlargement or
tapering of the pipe is an indication of over pressuring. The Backpressure Rating listed
in Table 2 is for the pressure holding capability of the GripSafe ST Double Block and
Bleed and could be well beyond the system design limitations in which it is being used
to test.
