vapor pressure

can you elaborate, what do you mean box side? i think this will be clearer if a simple diagram with label is presented.

thanks.

thanks for your reply.

what i meant was pressure at stuffing box side.

Regards

SLN

there's no way you can reduce vapor pressure but by lowering the temperature of the fluid inside.

Thanks for your help.

vapour pressure is given in pump datasheet supplied by end user/pump manufacturer. I am not trying to reduce it. is there any reducer fitted between stuffing box and impeller in case of vs4 pump(API pump classification)

Regards

SLN

vapor pressure given by the manufacturer also connotes the temperature of water to be handled. and the actual application is on 260 degC? in that case you will subject your pump to an extreme temperature beyond its design, this result to a disaster.

better ask the OEM if their equipment can handle this condition.

0.11 bara and 260°C sounds more like superheated steam than water.

0.11 bara is below atmospheric and is a vacuum condition. Water cannot exist as liquid at 260 deg. C and this pressure. If water has to exist as a liquid in equilibrium with vapor at 260 C, it has to be under a high pressure such as what you have found from the tables. The stuffing box has to be designed suitably to stand a pressure of 40 bara and a temp. of 260 C. on the innerside and atmospheric pressure on the outer side.

Er, um, <...water...> at <...260 C...pressure...0.11 bar a...> is actually superheated steam. It cannot exist in contact with liquid at these conditions, as the <...water...> will boil.