2-37. PIPING INSTALLATION MAINTENANCE.
ROWPU piping consists of three types of plumbing, grooved pipe, threaded pipe and tubing Maintenance of the
piping installation consists of replacing/repairing defective piping components. Refer to the following paragraphs for
specific maintenance instructions.
2-38. GROOVED PIPE (PIPE SECTIONS, ELBOWS, FITTINGS, ETC.) MAINTENANCE.
This task consists of:
General Mechanics Tool Kit (Appendix B, Section III, Item 4)
Lockwasher (A/R) - MS35338-139
ROWPU shutdown (TM 104610-240-10).
Power shutdown (power source manual).
ROWPU piping drained (TM 104610-240-10).
General Safety Instructions
ROWPU piping and equipment can contain extremely high pressure during and after operation If
this pressure is not relieved before performing maintenance, serious injury or death may result.
Be sure to open all drains and vents before performing maintenance.
The following procedures are typical for all grooved piping, elbows and couplings used in the
ROWPU. Some of the removal and installation instructions may not be applicable to your
maintenance task. Perform only those tasks that affect replacement of the defective components.
a. Locate ends of grooved pipe (5) to be removed.
Some grooved pipe sections are held in place with retaining straps. Remove retaining straps as
b. Remove two screws (8), flat washers (10), lockwashers (9), retaining strap (11), insulation tape (12).
c. As required, remove sensing lines (6) and adapters (7) from grooved pipe (5).