In the American Pipe Manual of the American Cast Iron Pipe Company. In Section 12, Historical Data, there are several tables that include information on class 22 pipe, including wall thicknesses, pressure ratings, etc. You can see this manual on their web site. Go to page 12-5 of the manual or...
If you want to know the pressure in the pipe at any point, you need to plot the profile of the pipe and the profile of the hydraulic grade line. It sounds like the pipe profile goes up and down, while the HGL of course is high at the pump end and meets the pipeline profile at the discharge end...
This is a water supply well, and the pump is actually an 8-stage submersible vertical turbine. For the pump that is proposed, the minimum flow is 45 gpm, we are designing a constant flow of 90 gpm, the BEP is at 105 gpm, and the max flow is 160 gpm.
If the BEP shifts left and down, then at...
I vaguely recall that there is something to watch for when using a VFD with a VTP, that is usually not an issue with a volute type pump.
In this application, we want to maintain a constant flow at a variable head. The operating rate is 95 gpm while the BEP for this is at 105 gpm at the rated...
I'm looking at two possible solutions.
1. I did find a mechanical relief valve for sewage. It uses a spring to oppose the line pressure, but still has pilot pipng to control the closing speed. The pilot piping is oil filled, and it uses a diaphragm chamber to transmit line pressure to the...
Yeah, I don't have the history. It was built in the 1970's. I'm speculating that the present PS location would have allow other connections into the gravity sewer coming down the hill, but that never materialized.
Thanks, little inch.
It is sanitary sewage. Flow to the pump station varies widely throughout the day. With wet weather, the peak flow can be 10x the average daily flow. You have to size the pumps and force main for the peak flow. Average or below average flows are stored in the wet well...
The pressure sustaining valve seems like a viable option. We could set it to hold back the static pressure due to the elevation change, and then the pump just needs enough head to crack it open and overcome the friction losses. I think that this would be a job for a constant speed pump.
I...
A sewer interceptor presently runs down a hill to a river bank where a pump station is located. The pump station pumps through a force main under the river which discharges into a manhole that is about 10 feet higher than the river. When the river floods, the pump station is inaccessible. The...
Yeah, it did look like I was going cheap, but I was actually looking at familiar things that happen to be cheap.
The Choke valves will be about $700 to $800 each which isn't bad in a project that will go well into seven figures. For this client it's all about reliability.
Thanks again. I...
Thanks for the leads! I don't run into this stuff very often in municipal water and sewer projects, but now we're doing work for gas companies, and I don't have all the answers.
I didn't like the looks of the devices with multiple orifice plates in series, because it looks like cleaning it...
I have a vertical turbine pump delivering 800 gpm @ 420 psi at the pump discharge. I want to divert some flow from that stream to spray nozzles to clean an intake screen. No other water supply is available. The screen needs 30 gpm at 40 psi. I was looking at adding a tap in the piping and...
