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Reverse rotation on pumps

Reverse rotation on pumps

(OP)
If reverse rotation cannot be avoided (eg. NRV is passing), what would be the way to prevent Pumps mechanical seal damage?
In DGS for compressors there is the by-directional seals. How about the pumps?

RE: Reverse rotation on pumps

Most pump seals are bi-directional. They do not have directional grooves unless you have a gas seal. What type of seal do you have? Any drawings?

If it is multi spring normal seal should be ok. Are you experiencing seal failures?

RE: Reverse rotation on pumps

(OP)
Actually we are still in FEED stage and studying the possibility of seal failure due to reverse rotation.
Most of our selection is for plan 53B which I believe will have no issue as in all cases it is working on the clean barrier fluid, but for other seal plans like 11, 13 or 31. I need to get more information and experiences especially from operators and seal manufacturers.
I remember once I found pump vendor who supplies a reverse rotation protection device but I recall it has its problems and constrains.

RE: Reverse rotation on pumps

As Flexibox put it, most seals now are using multi spring design and is bi-directional.
Single coil spring seals are uni-directional.

RE: Reverse rotation on pumps

As most seals are dual pressurised I think you should ensure the seals are suitable for reverse pressure conditions should it ever occur.

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