Pigging System Issue
Pigging System Issue
(OP)
Hello,
We currently have an HPS Pigging System installed in our plant for our cold blend soup line. The pig is being pushed perfectly in the forward direction at 50 psi, however when the pig is returning back to its homing station, it gets stuck at the metal detector crimp we have installed (at this place we have a decrease ID). We are also returning it back with 50 psi of pressure. Does anyone happen have a solution or direction on where we can go in resolving this issue? We think we might have an issue with the seal or one of the valves not being opening properly but we are unsure.
We currently have an HPS Pigging System installed in our plant for our cold blend soup line. The pig is being pushed perfectly in the forward direction at 50 psi, however when the pig is returning back to its homing station, it gets stuck at the metal detector crimp we have installed (at this place we have a decrease ID). We are also returning it back with 50 psi of pressure. Does anyone happen have a solution or direction on where we can go in resolving this issue? We think we might have an issue with the seal or one of the valves not being opening properly but we are unsure.





RE: Pigging System Issue
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
RE: Pigging System Issue
RE: Pigging System Issue
Good luck,
Latexman
RE: Pigging System Issue
Patricia Lougheed
******
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RE: Pigging System Issue
Would expect that a reduced pipe size such as the metal detector crimp ID would trap the pig. There is probably more air energy would the pig is moving forward.
Is it possible to install a line size metal detector?
RE: Pigging System Issue
RE: Pigging System Issue
Good luck,
Latexman
RE: Pigging System Issue
Even if pressure is the same forward and back, is the metal detector near any sharp turns? Maybe forward there is enough straight pipe and pig momentum to jump the metal detector, backwards if it slows at a turn shortly before it gets to the metal detector, it hangs up.
RE: Pigging System Issue
The distance (and volume) from station A to the crimp is much less than that from the crimp to station B. The charging bottle volume is not large compared to the B side volume. As volume (behind the traveling pig)expands pressure drops to the point where it will not push the pig past the crimp.
Can you increase pressure or enlarge the charging bottle?
RE: Pigging System Issue
RE: Pigging System Issue
Without seeing further details of the system, the only sure fix is to install a line size metal detector.
RE: Pigging System Issue