API Plan 13
API Plan 13
(OP)
I have a vertical in-line pump with a plan 13 piping. The piping has a high point vent on it..is the plan 13 line not a vent in it self? The piping comes off horizontally from the seal (highest point) and goes down towards the drain line where it Tee's off..
Some say the high point vent is necessary if the piping coming off the seal is slightly higher than the seal before it goes down to suction..is this true??
Some say the high point vent is necessary if the piping coming off the seal is slightly higher than the seal before it goes down to suction..is this true??





RE: API Plan 13
Johnny Pellin
RE: API Plan 13
RE: API Plan 13
The Plan 13 piping cannot vent the pump when it is not running because both ends of the line are at suction pressure and there is no differential pressure to drive any flow. It is only after the pump is started, that the seal chamber pressure increases and provides the pressure differential to vent the chamber.
As I said, venting is desirable but not mandatory. We have dozens of pumps of this configuration with this piping arrangement. Some of them are set up for venting and some of them are not. I prefer to vent when it can be done safely.
Johnny Pellin