mechanical seal for VS4 pumps
mechanical seal for VS4 pumps
(OP)
Dear all,
I have two question:
1-Could you please help me to select the suitable mechanical seal for VS4 pump for sour croud oil?
Some belive that because in VS4 the liquide level in sump is below the discharge flange, mechanical seal is not required.
Do you agree?
2- if both vs1 and vs4 handle our application wich one do you select? Vs1 or vs4?
Best regards
I have two question:
1-Could you please help me to select the suitable mechanical seal for VS4 pump for sour croud oil?
Some belive that because in VS4 the liquide level in sump is below the discharge flange, mechanical seal is not required.
Do you agree?
2- if both vs1 and vs4 handle our application wich one do you select? Vs1 or vs4?
Best regards





RE: mechanical seal for VS4 pumps
2 - Continuous duty and/or part of a real process, VS1. Intermittent duty and/or just draining a sump (flow control not important) VS4.
RE: mechanical seal for VS4 pumps
But our flow is sour oil and all of our pumps are equiped with singel mechanical seal. In this case we need to drain the sump intermittent. I dont khow what is the dry gas seal in suction side. Could you please explaine
Thanks.
RE: mechanical seal for VS4 pumps
A VS1 pump (vertical turbine pump) always requires a mechanical seal. The point where the shaft passed out of the pump is under full discharge pressure and flooded. For a pump of this type in sour crude, we would require a pressurized double seal (API Plan 53) as a minimum to meet environmental requirements.
Given the choice I would prefer a VS4 pump in order to eliminate the need for mechanical seal and a seal support system and to reduce the possibility of a substantial leak.
Johnny Pellin
RE: mechanical seal for VS4 pumps
well noted
RE: mechanical seal for VS4 pumps
this only for my information, could you please explaine why we use VS1 for continuse application? is it possible we use VS4 for process or continuse application?
what isyour reason for selection these pumps?
thanks
RE: mechanical seal for VS4 pumps
this only for my information, could you please explaine why we use VS1 for continuse application? is it possible we use VS4 for process or continuse application?
what isyour reason for selection these pumps?
thanks
RE: mechanical seal for VS4 pumps
VS4 efficiency is usually very low compared to VS1, so for continuous service the utility costs will be too high.
VS4 are good at emptying sumps using level switches (high level pump turns on, low level pump turns off) and they are cheaper than a VS1. Beyond that, if you have a "real" process that requires a specific head and flow, with some flexibility in adjusting the conditions, then you want a VS1.
RE: mechanical seal for VS4 pumps
Your response is always a good guide for me. thanks for your help
RE: mechanical seal for VS4 pumps
RE: mechanical seal for VS4 pumps
In addition I think in a sump pump we have three possible location of leakage (whether gas or liquid):
- Mounting Plate
- Back Liner Seal
- Impeller Thread Seal
The mentioned sealing systems (double lip seals) is proper for which of them? What shall we do for preventing the fluid leakage from these three locations?
Thank you all!
RE: mechanical seal for VS4 pumps