Pump piping configuration
Pump piping configuration
(OP)
Hi all,
I am in a work of sizing pump and its pipeline. The pump discharge has 2" nozzle and the pipe sizing is 6" diameter. Which should i use :
1) Either 2" block valve, 2" check valve and then expand the line to 6" diameter or,
2) expand the line to 6" diameter and use 6" block valve and 6" check valve.
Why?
Thanx for your help...
-Rayz-
I am in a work of sizing pump and its pipeline. The pump discharge has 2" nozzle and the pipe sizing is 6" diameter. Which should i use :
1) Either 2" block valve, 2" check valve and then expand the line to 6" diameter or,
2) expand the line to 6" diameter and use 6" block valve and 6" check valve.
Why?
Thanx for your help...
-Rayz-





RE: Pump piping configuration
Before answering your question, you need to look at you system (Piping arrangement and size, inlet pressure, discharge pressure, flow rate ... etc.) usually we expand the pipe gradually for example, from 2" to 4" to 6", to avoid pressure drop, you need to look at your complete piping system in order to size the pump correctly.
To start pump sizing, Pump are simply provided to overcome a systems natural resistance to flow. The first thing you need to do is determine the required flow, and then calculate the resistance in the system at that flow rate. There are many charts tables and programs to help you with this. Next you must select a pump that will fit the system
It is not enough to specify pumps based on anticipated head losses, you need also to measure the other losses.
The final check when selecting a pump is to make sure the net available suction head exceeds the required net suction head. This insures the application will not cause
vaporization inside the pump causing (cavitation).
RE: Pump piping configuration
Naresuan University
Phitsanulok
Thailand
RE: Pump piping configuration
discharge piping is used on a 2 " pump - as rightly Artisi has pointed out - there is no economical uncertainty about the valve -> 2 " is vastly cheaper than 6 " valve and there is no engineering advantage to go for the bigger valve in this case either.
RE: Pump piping configuration
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Pump piping configuration
Regards checman
RE: Pump piping configuration
RE: Pump piping configuration
RE: Pump piping configuration
Flow have been determine which is 325 gpm. Artisi, the piping size choosen is 6" because at lower size (4 or 3 inches) the pressure drop and the velocity is high exceed the piping standard that we use (5 -12 fps).
The problem is the pump supplied by vendor has 2" discharge nozzle. So we need to expand it to 6"
For rated flow the pumps has total developed head much higher than required, so it will easily overcome additional pressure drop from 2" valve.
I'm just not sure about using 2" valves since the line sizing is 6".
Checman: u said u would just use good engineering standards to apply the valves. Could I know the standard for valves??
Is there any judment for valve sizing, (like in control valve and orifice sizing we should know wheter the flow will be choked or not..)?
Thanks all
-Rayz-
RE: Pump piping configuration
A 4" line would have a velocity of 8.2 ft/sec which would be more typical in my opinion. However, if the discharge piping is long or there is a possibility of future capacity increases, the 6" could be justified. Over and above the velocity, the decision for selecting a pipe diameter is also affected by the overall pressure drop.
For the 2" pump nozzle, you are looking at 35 ft/sec velocities. I wouldn't definitely NOT even consider 2" check valve and block valves. 3" is still close to 14 ft/sec which is higher than I would typically select. Check that the velocity through the check valve is high enough to ensure the check valve is fully open, Crane's technical paper discusses this.
RE: Pump piping configuration
Naresuan University
Phitsanulok
Thailand