IP-015
Page
2
of
6
25JUN18
Do not exceed the maximum temperature indicated on the label of the PLIDCO Clamp+Ring. The
maximum temperature indicated on the label refers only to the maximum operating temperature
of the PLIDCO Clamp+Ring. It does not imply the PLIDCO Clamp+Ring is capable of resisting
longitudinal thermal expansion forces associated with raising the temperature of the pipeline from
ambient to the maximum temperature indicated on the label. Please refer to “designed end
restraint” described earlier. If necessary, please consult PLIDCO Department 100 for further
details.
During the
Pipe Preparation
and
Installation
procedures, those installing the PLIDCO Clamp+Ring
must wear, at minimum, Z87+ safety eyewear and steel toe safety footwear.
If the pipeline has been shut down, re-pressuring should be done with extreme caution.
Pressurizing should be accomplished slowly and steadily without surges or water hammer that
could vibrate the pipeline and fitting and exceed the axial end restraint rating. Industry codes and
standards are a good source of information on this subject. Do not exceed the maximum end
restraint indicated on the label as described earlier. Personnel should not be allowed near the
installation until the PLIDCO Clamp+Ring has been proven.
Pipe Preparation
1.
Remove all coatings, rust and scale from the pipe surface where the PLIDCO Clamp+Ring will
contact the pipe.
2.
Survey the outside of the pipe to confirm a circular cross section, particularly in the area of the
clamping sections. This area should be a smooth curved surface without indentations or flat spots
that could adversely affect proper griping.
3.
Grind pipe welds flush with the outside pipe surface where the PLIDCO Clamp+Ring will contact
the pipe, if applicable. Failure to do so will concentrate all the clamping force directly on the crown
of the weld and could cause the weld to fail.
4.
Use a ring gauge for submerged pipelines where visibility is limited. PLIDCO has available ring
gauges that can accurately survey the cross-sectional shape of the pipe. Information is available
upon request.
5.
The bolting force generated when assembling the two halves is capable of reshaping minor out-of-
round pipe. Maximum allowable ovallity is approximately 5%, depending on the pipe wall thickness.
Flat spots are very difficult to reshape and the bolting force should not be relied on to correct
flattened or indented areas.
6.
Except for underwater installations, clean and lubricate all PLIDCO Clamp+Ring studbolts and nuts.
Prove free and easy nut running prior to installation. Lubricants are not recommended for
underwater installation due to the potential to collect sand and grit.
7.
Careless handling can damage the PLIDCO Clamp+Ring. Lifting devices such as chains, cables
or lift truck forks should not contact the clamping sections.
Installation
1.
If the ring halves were shipped as an assembled unit it would have been shipped with spacers
between two halves. Typically, small diameter nuts are used for the spacers. The spacers must
be removed and discarded before installing the PLIDCO Clamp+Ring. Failure to remove the
spacers will prevent the PLIDCO Clamp+Ring from properly gripping the pipe.