Vent Requirement on OH3 Seal Plan 13

az5333 · Jul 20, 2023

Hi fellow engineers. A pump supplier has provided us a vent with API Plan 13 for an API 610 vertical inline OH3 pump. I did not know there was a requirement of a vent. Do we know why it is required and can we blind it off? Thanks.

TenPenny · Jul 20, 2023

According to Eagle Burgmann, "A high-point vent must be provided in the vertical pump seal chamber (or seal gland) to ensure that seal faces never see vapors."

Ref:

https://www.eagleburgmann.com/en/products/api-682-4th-edition-piping-plans/process-side/api-plan-13

georgeverghese · Jul 20, 2023

Suspect this high point from the seal chamber is to allow of escape of flash vapor produced in the sealing liquid as a result of the heat generated at the seal faces. This would be valid for process liquids with bubble point temp lower than say 15-20degC above the max operating temp of the process liquid at minimum normal operating suction pressure.

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Vent Requirement on OH3 Seal Plan 13

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