Thanks for the input.
I recently discovered we are adding triple redundant feedwater flow meters. So now I just need to figure out the correction factors for partial load performance. As my conditions will vary from design. I guess I'll thoroughly read through the document you posted davefitz...
Do you have any of the vibration data available? Are the vibration levels the same each time the fan becomes imbalanced? Some data would help diagnose your problem.
It is possible you have a process problem rather than a mechanical problem with the fan. Such as rmw said about the material...
At our coal fired facility we recently replaced four of six feedwater heaters. With the recent replacement I must measure/calculate the new heater performance. I will need to do this for startup conditions of which I do not have all the desired measured parameters needed to calculate TTD...
The fan has no imbalance, it run less that 0.1 in/sec. The critical speed of this fan system is 460 RPM and we normally do not run at that speed. We are currently running above 500 RPM.
We have considered the mechanical resonance in the ductwork and steel and have gone far enough as to find the...
The primary control is for furnace pressure on a boiler. We are controlling fan speed with a variable frequency drive. Fans are in parallel. The drive is doing what the control system is demanding, which is trying to control the furnace pressure (-0.5"). Furnace pressure oscillates +- 0.5" and...
I do not have have the design calc for the fan. The fan is performing as it should as it relates to pressure rise. What I am trying to do is plot the operating point on the fan curve live with the instrumentation that I have.
The true problem is we suspect the fan is surging or in a rotating...
...have used a motor sizing equation to give me a rough estimate, but am not sure if this formula can be used to calculate the CFM?
Horsepower = {CFM*Pressure(lbs/sq ft)}/{33,000*efficiency}
I have a few questions regarding this method:
- is this a valid equation to use for a rough estimate?
-...
...have used a motor sizing equation to give me a rough estimate, but am not sure if this formula can be used to calculate the CFM?
Horsepower = {CFM*Pressure(lbs/sq ft)}/{33,000*efficiency}
I have a few questions regarding this method:
- is this a valid equation to use for a rough estimate?
-...
myrdale,
Definately have the boiler manufacturer perform the hydrotest.
After they have performed the test and as years pass, you and your team can perform the test. I've seen this done routinely to test tube leak repairs. It is not uncommon. But for a new boiler it needs to be the boiler...
I was looking to see what reccomendations/options anyone had on cleaning a new steam supply for a 1st point feedwater heater after construction. I have been looking at some startup documents, but no good information is available for feedwater supply lines (lots on main steam line "steam blows")...
The supplier can not raise pressure until they start using the original pumps, which will be some time from now. We'll look at trying some of the things you suggested. What is a high boiler?
I agree with you, summer time will be a drag, and it is around the corner.
What I meant, is what is the...
Originally the line was suppose to run at 250 psig, but the supplier is using different pumps currently. We definitely have problems downstream of where our line comes up with the vapor pressure. But now, I'm just trying to resolve this problem. Out of curiosity, what is your pipeline used for?
BigInch - there are no high points in the line, and yes it is pretty much same elevation except for the dips.
Velocity @ 400 lbs/hr = 0.03 ft/s
The pipeline is oversized, the supplier wanted to be able to supply "other customers" in the future. Maximum flow for our process is 5,000 lbs/hr...
I have a startup situation which is quite puzzling:
A ~10 mile, 4 inch anhydrous ammonia pipeline supplies ammonia to our plant process. The line is ~4 foot underground throughout except where it crosses under rail crossings and in two locations where it goes under river.
Initially, the line...
Wow! How are you able to tell we have flashing? I am no expert in chemistry, but would greatly appreciate if you could explain. That will definately explain some of the drop.
I agree with rzrbk on installing it right after the pump. In fact some codes (ANSI K61.1) require you install one immediately on the discharge of the pump. Installing it after the check valve may give you false pump readings if the error is in the check valve.
Here are the conditions,
Original conditions:
Max inlet pressure - 730 psig
Outlet pressure - 600 psig
Temperature - 93 F
Max Flow - 16.2 gpm
Current conditions:
Inlet pressure - 170 psig
Outlet pressure - 30 psig
Temperature - 50 F
Flow - 625 lb/hr ~ 2 gpm
This valve (regulator) has a...
I have a Fisher 627WH pressure regulator, used in anhydrous ammonia service. This valve was originally going to see up to ~750 psig and drop it down to 300 psig, but now is only seeing about 150 psig. I am seeing excessive pressure drop across it, ~100 psig! It doesn't make any sense, the valve...
