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FRM-22.1-Rev.H-SMDBB
7.
Positioning
for Between the Seal Hydrotesting
7.1 If using the plug to hydrostatically test a weld, ensure proper Depth of Insertion by using
the following method:
1.
Measure the
Weld Zone Depth
, distance from the pipe or fitting end to the
center of weld area to be tested.
2.
Measure the
Mid Ring’s(12)
center distance, distance from the top of the
Compression Hex Nut(21)
to the center distance of the
Mid Ring(12)
. Note:
When measuring the center distance of the
Mid Ring(12)
, make sure that the
plug is in the Compressed state as shown in Figure 5.
3.
Subtract the Weld Zone Depth from the
Mid Ring’s(12)
center distance.
4.
Insert the plug while measuring from the pipe or fitting end to the top of the
Compression Hex Nut(21)
and stop inserting when the reading on the
measuring tape matches the difference found in step 3 of this subsection.
Example:
Mid Ring’s(12)
Center Distance
= 17.25”
Weld Zone Depth
= 2.53”
Mid Ring’s(12)
Center Distance –
Weld Zone Depth
= 17.25” – 2.53” =
14.72”
Figure 8: Insertion Depth for Testing Weld
