What is pickling and flushing of pipelines?
when the new gas pipeline is installed for service, before
comissioning pipelines, pipelines to be pickled, Pickling and
flushing of pipelines means pre-odorization of gas pipelines to
mainain the odorance level at end user. The purpose of pickling and
flushing of pipelines is to identify the gas leaks and to avoid the
gas leakage accidents, For instance the location of A to B new gas
pipelines has to install for service, gas contains some amount of
tery butyl mercaptan (TBM)(high odorant component), it reacts with
pipeline inner porous materials is having matel oxide to produce
the disulfide , this disulfide is less odorance than TBM, so the
odorance will be vanished due to gas flowing in long pipelines, so
pre-odorization methods have three types 1. Injection of highly
odorized gas (over 40 ppm)
2. Slugging, i.e. pouring a bulk amount of liquid odorant
directly into the pipeline and letting the pipe "pickle" for a
prolonged
3. Continuous injection of controlled dosage the determination
and regulation of the size, frequency, and number of doses.