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For GripSafe
®
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Copyright ©2022 USA Industries. All rights reserved.
FRM-22.1-Rev.H-SMDBB
6.5 Use a crow’s foot attached to a torque wrench to torque the
Compression Hex Nut(21)
while holding the Backup Hex or flats on the
Shaft(1)
stationary with a wrench until the
Minimum Compression Torque (Table 2) is reached.
6.6 Verify integrity of the
Seals(14)
6.7 Use proper fittings to install a manual hydrotest pump to the
Swivel Pipe Union Fitting(3)
.
•
Pressurize to 500 psig or 75% of target pressure for 10 minutes to ensure both
Seals(14)
are seated. Then proceed to desired pressure. Observance of pressure drop may not be
an indication of leakage. USA Industries
Seals(14)
will creep under pressure until they are
fully seated. This creep will increase the pressure test volume. Depending on the test
volume size, this may be by such a trivial amount it will not be seen on a gauge. For
relatively small test volumes a noticeable gradual loss in pressure may be observed during
this creep phase. Seating the
Seals(14)
is obtained by reapplying pressure until the
pressure becomes stable. This seal creep may also be observed when the system is
subjected to the full pressure. Resolution to the creep is the same at high pressure and
while verifying integrity.
6.8 The GripSafe ST DBB plug is now safely installed to accept rated hydrotest and backpressure
pressures.
TEMPERATURE NOTE:
If welding is to occur on the pipe while the plug is installed,
the
Seal(9)
should be installed a minimum of 6” from the center of an active weld to
prevent it from degrading or ultimately failing due to melting. For post weld heat treats,
bake-outs, etc., the
Seal(14)
should be at least 12” from the nearest edge of the
heating element, and the temperature at the depth the plug is installed at should not
exceed 220° F. If a high temperature bake out is being performed (400° F or higher)
increase the installation depth as much as possible. It is recommended to always
monitor the pressure behind the plug (ORB) and/or between the seals (DBB) and stop
work immediately if any pressure drop is detected. In addition, the pipe’s external
surface temperature should always be monitored corresponding to the plug’s seal
location to ensure damage to the seal does not occur.
CAUTION:
Using an impact wrench is not recommended as it can damage both the
Spring Plate Alignment Screw(8)
and
Wedge Cone Alignment Screw(11)
for sizes
¾” – 2” or
Spring Plate and Wedge Cone Alignment Key(26)
for sizes 2-1/2” and
above.
CAUTION:
Failure to use a backup wrench to keep the shaft stationary will place
excessive stress on the
Wedge Cone Alignment Screw(11)
for sizes ¾” – 2”, or
Spring Plate and Wedge Cone Alignment Key(26)
for sizes 2-1/2” and above, which
could cause failure, resulting in a stuck plug and/or cause it to eject under pressure.
