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Wallet cards for clocking gas meters?
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JohnNY
Member Posts: 3,230
Hello,
Does anyone know where I can purchase or otherwise acquire printed wallet cards for clocking gas meters?
Best to all,
John Cataneo
Does anyone know where I can purchase or otherwise acquire printed wallet cards for clocking gas meters?
Best to all,
John Cataneo
Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
Consulting & Troubleshooting
Heating in NYC or NJ.
Classes
Consulting & Troubleshooting
Heating in NYC or NJ.
Classes
0
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I just use the timer on my phone and then the calculator. I take 3,600,000 and then divide by the time in seconds to make one cubic foot. Seems just as easy as using a chart.
Rick0 
Try getting a printout from the utility. I can't even remotely remember when I laminated this. Keyspan has been gone for a while.
0 


So, the takeaway here is I gotta make my own?Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
Consulting & Troubleshooting
Heating in NYC or NJ.
Classes0 

its easier to learn the math...
Ricks math can be off and hvacnuts cheatsheet is only good for 7" gas. you need to modify the formula for 2 lb metering pressure systems....
7" metering system;
3600 divided by the seconds to pass 1 cubic foot equals cfh per hr.
2lb metering system;
3600 divided by the seconds to pass 1 cubic foot times 1.12 equals cfm per hr.
multiply either by the heat content of the local gas gives out btuh input.0 

Thank you. I think that font is hard to read at small sizes but I'll check it out.STEVEusaPA said:I posted a pdf. Print it, laminate it if you want, or save and look at it on your phone.
Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
Consulting & Troubleshooting
Heating in NYC or NJ.
Classes0 
i know some guys who work for the gas company, very smart guys and the gas co who mfg'd gas that was made on the banks of the Mississippi around the turn of the century.ratio said:
How did you derive this? I'd really like a formula that I could plug in meter pressure & get a correction factor of some kind.ch4man said:…
2lb metering system;
3600 divided by the seconds to pass 1 cubic foot times 1.12 equals cfm per hr.…
as i was told;
a gas meter will pass 12% more gas at 2 PSI than 1/4 psi.
a gas meter will pass 2% more gas at 14" WC than 1/4 psi.
this is why you gas bill has correction factors. most gas meters are temperature compensated but not pressure compensated.
now think of the physical size of a tank of nitrogen at what a couple few thousand psi. the weld shop sells then as 80 cubic feet. that tank aint that large on the outside1 

Is line pressure inches or pounds? 14.74 is atmospheric pressure & may be corrected for elevation?Mike_Sheppard said:Pressure correction:
(14.74 + line pressure) / 14.74 = Y
(Y x 3600 x Dial Size) / Seconds for revolution = CFH
Multiply by btu content of the gas to get BTU/hr0 
Just have a pic of the chart and create a folder. I have Google Pics app, I have the chart in my Technical folder.0

my information falls right in line with mike Sheppards math when going from a 7" system to a 2lb system.
thx Mike, i never knew the math behind the correction factors0 
You have to multiple/divide like units for them to cancel out.ratio said:
Is line pressure inches or pounds? 14.74 is atmospheric pressure & may be corrected for elevation?Mike_Sheppard said:Pressure correction:
(14.74 + line pressure) / 14.74 = Y
(Y x 3600 x Dial Size) / Seconds for revolution = CFH
Multiply by btu content of the gas to get BTU/hr
1 
@ratio sorry about that  yes the line pressure is in PSIG.
To be more specific:
(Atmospheric pressure + Line Pressure PSIG) / Atmospheric BASE pressure“Atmospheric pressure” gets corrected by you based on your altitude.
”Atmospheric BASE pressure” is the atmospheric pressure that your gas company references. The altitude that the gas company uses and the altitude at your job site may not be the same.
As for the rest of the equation.
3,600 = The amount of seconds in an hour. Because we are trying to calculate cubic feet per hour (CFH) by counting the amount of seconds it takes a certain dial to make a revolution.
After you get CFH figured out you just have to multiply it by the BTU content of the gas to get BTU/Hr.
You can call your gas company to figure out the BTU per cubic foot of gas they supply. Where I am at it is about 1,020 btu per cu/f.
There is also a temperature correction that I never use because the difference is so small. And I also do commercial/industrial and most of the meters I deal with are already temperature and pressure corrected.Never stop learning.1 
Talk to the Bacharach rep. They gave me a stack of them many years ago. I don’t know off hand if they still have them or not.gwgillplumbingandheating.com
Serving Cleveland's eastern suburbs from Cleveland Heights down to Cuyahoga Falls.2 
@Mike_Sheppard , Thanks for posting the formula, that is super useful for both clocking boilers and calculating gas usage on 2# meters.
The attached doc shows how much the BTU content and specific gravity varies in the high altitude region of the west. The process gets a little more complicated when you throw derated gas into the equation. To determine the PSI at altitude, this is a useful resource https://www.engineeringtoolbox.com/airaltitudepressured_462.html"If you can't explain it simply, you don't understand it well enough"
Albert Einstein0
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