Does MCSF vary with the speed of the pump? I have seen the definition below for MCSF from a Pumps and Systems article, but it doesn't adress a change in speed. I have a boiler feed pump that has a MCSF line with the supplied pump curve, wondering if this line would move to the left with a...
Well water analysis:
Chloride - 35.6 mg/L
Iron - 12.1 ug/L
Manganese Dissolved - 1.51 ug/L
Hardness - 259 mg/L
pH - 7.41
Alkalinity - 305 mg/L
Once pumped out of the deep well only chlorine is added to obtain a free chlorine level of ~1 ppm.
Pipe deposit elemental analysis
Appearance...
The line was chlorinated at a high level for a short period (per AWWA standards) when it was initially put in to service. To repair the line, we just replaced the entire length of this particular line with Sch. 80 carbon steel, once we opened it up and found the amount of tubercules on the...
No, these deposits are around the entire inner circumference of pipes, the entire length of the pipe, but the deposits only located near a weld. Therefore heat tint sounds like it could be a likely possibility for corrosion, but I am wondering what kept it going?
My company has been using 304L Stainless Steel piping for domestic water service for approximately 10 years now. They began the use of this pipe based on recommendations from a few technical papers that the chlorine levels (1 ppm free chlorine avg.) were low enough to not cause corrosion...
Thanks for all the replys, they will help me in my analysis. The VFD room cooling requirements and VFD maintenance reasons listed above have led us to use more Magnadrives around our plant which might be applicable in this application since feedwater from our deareator is only 220degF and...
BigInch,
You wrote:
"And with the same flowrate, drop straight down from full operating point to the intersection with the 1/2 speed pump curve and you have about 66%, but notice that your system curve indicates that you cannot flow there unless your system curve can somehow be changed...
In the following thread: thread407-166705 the following quotes state that efficiency stays relatively unchanged at different rpms
"This is what Sulzer has to say on the subject of efficiency as function of speed of rotation:
Quote:
Where the system curve derives wholly or mainly from...
Ok, I think I found it. There is a make-up to this system. Regulated to about 50 psig. It was hidden from view and an engineer who has been here longer than I pointed out.
I am having a brain fart here, this must be something easy. I don't ever deal with closed loop type systems, and any of the books I have found on pumps don't spend a lot of time on closed loop systems. Anyway, I have an existing closed loop chilled water system that is a constant flow system...
