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- Furnace is shutdown, de-pressured and blanked.
- Hydrocarbons are removed from heater tubes by steaming
or flushing.
- Process piping is unhooked and removed to prepare for
pigging - 300 rf Flanges.
- It is preferred, but not mandatory, that inlets and outlets
of each pass be piped to grade (ground level) to ensure
safety. Depending on the size of launcher/receivers used,
the space required to install and operate is approximately
1.2m x 2.4m. (4ft. x 8ft.). Minimum overhead clearance required
is 2 meters (7 ft).
- All thermo wells must be removed.
- It’s with a similar size to the clean I.D. of the
heater tubes to be cleaned may require a blind flange with
insert. The issue of any steam injection lines, valves,
etc., which may interfere with the travel of the pig will
be discussed and addressed prior to job commencement.
- The transition from HKS Pigging Systems’ Ball Valve
Launcher/ Receiver to the Refinery’s supplied 300 rf
flange piped to the heater inlets and outlets must be smooth.
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