V. PIGGING SYSTEM
The flexible pipe must be purged from its water content before being retrieved onboard the ROWPU barge. This will
reduce the weight of the pipe, minimize the back hauling forces and facilitate retrieval.
The pigging system is comprised of the following components:
- One (1) pig launcher (AISI 316 stainless steel), a stationary part bolted to the drum pipe water inlet. Water supply will
be connected to the pig launcher branch inlet, while compressed air is connected to the pig launcher main inlet through
a 3/8" nipple.
- Ten (10) flexible pigs 4" OD x 8" length.
- One (1) pig receiver (galvanized steel), a removable part to he connected to the shore flange prior to pigging.
See Figure V-1.
The pigging system requires a 125 psi air supply.
One pig will be launched at a time and then recovered in the pig receiver at the beach end. The pigs can be reused for
successive operations if no visual damage is apparent to the pig body.
Instructions for pigging operations are given in Section VI.5.