I've done quite a bit of background, mostly because we are putting up just over a 1/4 mile worth of pipe for this and it's all in a crowded piperack. The pipe is cheap enough but the charge for fabrication/install/trace/insulation is going to be a few hundred thousand so I want to do it right...
We are looking to replace a 50% Caustic line. Our pipe spec references NACE and says to use PWHT Carbon Steel up to about 170F. We shouldn't get higher than 150F but it gets hot in Texas and the caustic is not always flowing in the pipe. I've read conflicting reports that 150F may be too high...
In parallel operation the larger pumps should still be okay. If we end up cutting the flow of the large one for a few minutes we'll be fine. The pumps/motors are large enough to take the swing and those sumps are plenty large enough to accommodate a small delay. Everything falls kosher on the...
Even with the two main pumps off, the header reads ~25 psig due to check valves and static head from other vertical runs further down the pipe. Either way, pump 3 should never pump alone due to the design of our sump system but to alleviate that possibility I was thinking about a back pressure...
Please ignore the first attachment. I forgot to add the downturn at the end of the pipeline. New attached diagram shows this.http://files.engineering.com/getfile.aspx?folder=d1da1978-e988-49db-ad75-a84b2ca5419e&file=sump_Diagram.png
Diagram attached. I've done a bunch of reading on parallel pumping. I've run the two main pumps independently (both off, one on, other on, both on) and got some pressure readings. My question stems from finding a TDH needed for the third pump. It's entirely different in flow, head requirements...
I've got a header that is charged by two parallel pumps. I'm trying to tie a third pump in downstream. I'm trying to come up with a number for TDH for the third pump. My only available pressure measurement on the header is about 12 vertical feet below my available tie-point. When calculating the...
Bimr: That's an interesting piece of equipment there, I'll have to look into that.
LittleInch: I'm trying to avoid a VFD just to avoid the complexity. This is an industrial site with a relatively small lift station and is a little behind the times in terms of controls. I don't want to be the...
I'm spec'ing out a new pump for our waste water lift station. The lift station will pump out via trash pumps through some discharge piping and into a common sewage header that runs to the treatment plant. The issue I'm having is that the common header is filled mostly by a another, larger lift...
My employer has recently emptied a 500,000 gallon tank that was full of water contaminated with Carbon Disulfide (CS2) and other organics. It was pumped down and run through carbon beds to remove the contaminants. Now at the bottom of that tank we have about 6 inches of sludge (roughly 6000...
It's pulling air into a manifold that runs the length of the room then pushes it through a filter and back into the room the system is drawing from. Things like blower type and materials have already been determined by the previous system that is already in place. And controls aren't an issue as...
I'm a Chemical Eng by trade (and a fairly new one at that) but I've been asked to do some work on a blower system. It currently operates at 2500SCFM, SP is about 30" wCg. They want to double the capacity of the system but I don't know what will work from a design standpoint (run parallel...
