pump help 1

[sunloco]

I saw a in-line centrifugal pump ,but it didn't have a baseplate ,from the outline drawings I only can see there is a pipe flange spool base match ANSI 125lbs flange dimensions.

my question is that this pipe flange support is underneath the pump to support the pump or underneath the sunction and discharge pipe to support the flange ????
also I want to know how many pipe flange support is for one in-line pump ?

 

[JJPellin]

There are two different styles of vertical in-line pumps in our plant. Most of them are not designed to be bolted down to a base. These pumps basically hang off the piping. There are supports under the suction and discharge lines close to the pump. In some designs, the pump manufacturer specifies that the weight of the pump should be supported on the base, but not attached to it. We would often pour a Sono-Tube with a flat top and the pump would sit on that. There is another class of vertical in-line pumps that are designed to be bolted down to a base. For these, the piping should be flexible so that the loads from the piping are not imposed on the pump to excess.

 

[sunloco]

JJPellin, Thank you fo your help.

 

[sunloco]

JJPellin,

Could you tell me where I can find details about this type of in-line pump? eg . outline or drawings for this type pump ,Could you give me any website address or others ??

 

[sunloco]

by the way , anyone know what is meaning of Sono-Tube ?

what is sono-tube looking like ? what is the outline ? material ?

 

[Artisi]

check Grundfos for detail on inline pumps

Naresuan University
Phitsanulok
Thailand

 

[JJPellin]

I am not sure about web sites for drawings of this style of pump. My reference to a sono-tube refers to the following: We drill a straight hole into the ground. We place a cardboard tube into the hole that acts as the form for the concrete. We set re-bar in to the tube and pour it full of concrete. This is basically an inexpensive way to make a foundation that extends down below the frost line. We are located in Minnesota and the ground can freeze up to 4 feet deep. The smooth cardboard tube keeps the frost from getting a grip on the column and moving it in the winter. We require all foundations to go down 6 feet. For web sites, I would google Flowserve, Sulzer, Union Pump and Ruhrpumpen. They all should have pages describing their vertical in-line pumps.

 

[sunloco]

JJPellin, thanks

ok, i see ,you means pour a concrete pedestal in the ground ,then the pump sits on this flat base (just sit ,not bolted ? ) .
Did you set a vibration damper under the pedestal?

Do you think it is neccessary to set vibration damper if the pump is with piping flange supports ?

 

[sunloco]

by the way ,anyone know ,Is there any function for adding some friends list in this forum ?

 

[JJPellin]

For pumps that are not designed to be bolted down, we do not use anything between the concrete base and the bottom of the pump. The manufacturer's literature states that the pump is not to be bolted down, but that the weight of the pump should be supported. I am not sure what you mean by vibration dampner. Perhaps a layer of rubber pad or something like that could be used under the pump. I have never seen this done. This whole issue is the main reason that we consider vertical in-line pumps to be the most unreliable configuration. The poor support, the long overhung shaft, the rigid coupling and use of the motor bearings to support the entire rotor all contribute to the problem. And to make matters worse, many of them are single volute cases. We have converted some of these pumps to OHV configuration vertical pumps that have full bearing housings and flexible couplings. These pumps are designed to be bolted down solidly to a foundation. Where we have done this conversion, the reliability was much better.