Caibration Problems

Discussion on general flowbench design
Flathead
Posts: 24
Joined: Fri May 28, 2010 9:19 pm
Location: Rawene New Zealand

Re: Caibration Problems

Post by Flathead »

Hi
Thanks Rick. I was using an extreme example to test theory but even with a .236" ID tube 24 " long at 7" vertical rise with .748" well diameter you end up with delta p of 9.39 WC". I am going to test this out in the weekend so will let you know.
Thanks
Grant
1960FL
Posts: 1338
Joined: Fri Jan 08, 2010 10:36 pm
Location: Maryland

Re: Caibration Problems

Post by 1960FL »

Grant,

Can you please point me to the spreadsheet you are using.

Thanks

Rick
Flathead
Posts: 24
Joined: Fri May 28, 2010 9:19 pm
Location: Rawene New Zealand

Re: Caibration Problems

Post by Flathead »

Hi Rick
Was using the 86rocco sheet Inclined Manometer Compensation maybe I was misinterpreting some of it. I have rebuilt my inclined manometer and for what ever reason with 24" long 7" vertical rise with a .236ID tube and a .748 ID well I have ended up with the bench calibrated and only had to move the incline up 1" to achieve it so my clutching at straws is over for the meantime anyway. I am now trying to get a steer on the remote testing as per another post can you help?
Thanks
Regards
Grant
Flathead
Posts: 24
Joined: Fri May 28, 2010 9:19 pm
Location: Rawene New Zealand

Re: Caibration Problems

Post by Flathead »

Hi
My new 7" Internal Plates arrived today so I have now tested against 28" calibration plates.
Calibration Plate 100@28" 150 @ 28" 200 @ 28"
200cfm @7" inside 106 @ 28" 151 @ 28" 197 @ 28"
150cfm @7" inside 108 @ 28" 151 @ 28"
100cfm @7" inside 106 @ 28"
Had to test the 100 against 100 at lower pressure and calc flow at 28"
So I am pretty pleased thanks to everybody who assisted in getting this sorted out.
Grant
1960FL
Posts: 1338
Joined: Fri Jan 08, 2010 10:36 pm
Location: Maryland

Re: Caibration Problems

Post by 1960FL »

Grant,

It is starting to look good but not to be anal but the 100CFM numbers do not look good to me, with the 200 CFM @ 7" plate in the bench this puts your delta P off by about .250" and with the 150 CFM @ 7" plat in the Delta P is off my .500". Are you measuring the rise on the incline or using a % scale"

Rick
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