A photo of the installation would be helpful. Can you let us know the % of error you're seeing and over what scale (i.e. 25% of flow, 50%, 100%?). The lower the flow, the larger the accuracy impact on imbalanced water legs. Is your pressure and temperature constant or are you compensating for...
Hi Massoud. It may not be as simple as that. Cold working the material (forming, rolling, bending, drawing, etc.) will change the hardness of the metal. Manufactured 316SS may have to be annealed in order to releive residual stresses from cold working the material.
2 issues I see:
1) You might want to check your #'s. 10 m/s is high velocity for water, not that I haven't seen it before. However, I calculate your volumetric flow rate of 120 GPM to be roughly equivalent to 3.5 M/S.
2) I believe the Fuji ultrasonic meter you're refering to is non-intrusive...
I've read all the replies and, unless I'm missing something, I haven't heard what industry sector this small company is involved in. IMO, this should play a role in your decision. Is the company focused on a particular market segment that is subject to cyclical business trends or are they...
Thanks for your responses. I've returned from the sight with some photos. Although NEL recommends the shortest impulse lines possible for gas and steam flow, I am in concurrence with Pamela and we have had success with with long impulse lines (where it can't be avoided). Under the new Eng-tips...
Hacksaw, we will make sure that we pre-fill the impulse lines from grade as you suggest. This is what we recommend, but often it is not done this way in the field. Thanks for the reminder. To answer your other question, it is not an orifice plate but it works on basically the same principal and...
I've attached a scan of the charts for the "calculated" vs. the measured steam. I was led to believe that a mag meter measuring the condensate was the reference for the calculated measurement. I just found out that there may be a "fudge factor" at the user's end to arrive at this number (I don't...
Hacksaw, the steam line is 30-40 feet above grade with no scaffolding - DP transmitter is at ground level. We try to make sure that legs are filled and bled (no entrained air). I'll provide a sketch or digital photo of installation.
Dan, thank you for the valuable link. We do not recommend...
Looking for anyone with experience in DP steam flow measurement with impulse lines (wet legs) 30-40 ft. in length. Having issues with the steam flow tracking the condensate flow. We're looking at a possible imbalance in the liquid legs that isolate the DP transmitter from live steam. When the...
Keep in mind that there is no governing body that can prevent a company from making flow measurement accuracy claims, whether it be a 4-hole O-plate, cone type, etc. Therefore, you must rely on the manufacturer for proof of accuracy. Has the meter been INDEPENDITALLY tested at an NIST traceable...
Chinook, given the revised flow rate I don't see why this can't be done with an avg. pitot. I ran a flow calculation (using a mole wt. of 32 based on the gas composition) and get roughly .72" H2O DP (with a good draft range DP transmitter, this is reasonable). Of course, I don't know what...
Chinook, can you check the flow rate and/or units again (SCFM vs. SCFH for example). The velocity at 78,000 SCFH in a 86" line seems extremely low (just 1-2 FPS). For example, at 78,000 SCFM (not H), the velocity would be roughly 40-45 FPS. Is there a rating on the main blower shown in your diagram?
Unfortunately, I don't throw much away so hopefully the attached pages (from Rosemount's 1997 catalog) will help.http://files.engineering.com/getfile.aspx?folder=6649294d-7674-458f-b4bd-a7426c32cbb9&file=1151.pdf
Decent article about flow measurement of slurries...
http://www.ferret.com.au/c/Endress-Hauser-Australia/Guidelines-for-slurry-flow-measurements-n695907
