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Re: SF Sizes
Posted: Fri Nov 25, 2011 2:07 am
by 65mustang393
Measured the 300 cfm plate diameter, cfm and airspeed.
Intake setting.
I measured the Plate at 2.044" diameter. 3.2813 sq inches of area.
289.4 cfm
289.4 x 2.4 = 694.56
694.56 divided by 3.2813 = 211.7 fps.
I got 207.3 fps. It was a PITA holding the pitot.
Re: SF Sizes
Posted: Fri Nov 25, 2011 9:49 am
by Brucepts
SF orifice plate it's a large picture!
Re: SF Sizes
Posted: Fri Nov 25, 2011 10:38 am
by 1960FL
Check this out, straight from the SF600 manual...
The values for all ranges are shown on the Calibration Data Card mounted on your SF-300/600
flowbench for 25” (60cm) of test pressure.
Important Note: The SF-300/600 flow ranges are based on a test pressure of 25”(63.5cm) of
water. If other test pressures are used, the flow scale calibration ranges should be corrected by
the following amounts.
I then put my 2.250 plate (356 calibrated cfm w/electronics) and it showed 78.2% of 442.9cfm = 346.3 cfm
Chad can you please flow the 2.25 plate at 25" I am having a hard time believing that there cal plate CFM only moves CFM/.997 moving test pressure from 25 to 28
if this is so your 2.250 plate should read 345.3 at 25
Please remember i am using the correction number Gerald posted not sure if your manual read the same.
Rick
Re: SF Sizes
Posted: Fri Nov 25, 2011 10:43 am
by Chad Speier
Bruce, my disk is gold..
A 2.044 plate would be set to flow 293.7 cfm on my bench. (13.29 x DIA²) x SQROUTE of test pressure.
Re: SF Sizes
Posted: Fri Nov 25, 2011 10:53 am
by Chad Speier
1960FL wrote:Check this out, straight from the SF600 manual...
The values for all ranges are shown on the Calibration Data Card mounted on your SF-300/600
flowbench for 25” (60cm) of test pressure.
Important Note: The SF-300/600 flow ranges are based on a test pressure of 25”(63.5cm) of
water. If other test pressures are used, the flow scale calibration ranges should be corrected by
the following amounts.
I then put my 2.250 plate (356 calibrated cfm w/electronics) and it showed 78.2% of 442.9cfm = 346.3 cfm
Chad can you please flow the 2.25 plate at 25" I am having a hard time believing that there cal plate CFM only moves CFM/.997 moving test pressure from 25 to 28
if this is so your 2.250 plate should read 345.3 at 25
Please remember i am using the correction number Gerald posted not sure if your manual read the same.
Rick
Rick
It flowed 334.2 cfm @ 25" w/FP
It flowed 73.6% manometer @ 442.2 = 325.5 cfm
My 2.250 plate is set to read 356 cfm @ 28"
2.250 = 3.98 in²
3.98in² - pitot diameter = 3.964 / 356 x 2.4 = 215.5 fps
Pitot measures 216.8 fps
Re: SF Sizes
Posted: Fri Nov 25, 2011 11:32 am
by hdwgfx
Brucepts wrote:SF orifice plate it's a large picture!
Bruce, what SF machine uses this disc???
Re: SF Sizes
Posted: Fri Nov 25, 2011 11:32 am
by 65mustang393
Pic of SF cal range correction chart.
Re: SF Sizes
Posted: Fri Nov 25, 2011 11:35 am
by 65mustang393
hdwgfx wrote:Brucepts wrote:SF orifice plate it's a large picture!
Bruce, what SF machine uses this disc???
SF300/600 models use that style disc.
Re: SF Sizes
Posted: Fri Nov 25, 2011 11:44 am
by 1960FL
Rick
It flowed 334.2 cfm @ 25" w/FP
It flowed 73.4% manometer @ 422.2 = 309.9 cfm
Chad did you mean to use 442.2 your range calibration
73.4% * 442.2 = 324.6.
Please help me here but in this quote,
The values for all ranges are shown on the Calibration Data Card mounted on your SF-300/600
flowbench for 25” (60cm) of test pressure.
Important Note: The SF-300/600 flow ranges are based on a test pressure of 25”(63.5cm) of
water. If other test pressures are used, the flow scale calibration ranges should be corrected by
the following amounts.
I read this as they say there calibration number in your case #5 442.2 is derived at 25" test pressure.
What does it say next "Following amounts"
Rick
Re: SF Sizes
Posted: Fri Nov 25, 2011 11:46 am
by 65mustang393
Chad Speier wrote:Bruce, my disk is gold..
A 2.044 plate would be set to flow 293.7 cfm on my bench. (13.29 x DIA²) x SQROUTE of test pressure.
It's the 300 cfm PAP I bought as a set from Bruce.