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LP gas tank regulatorLP Gas, Propane Gas Tank Pressures

  • LPG & PROPANE TANK PRESSURES - CONTENTS: LP Gas or Propane Tank Pressures, What are the typical pressures found in LP gas or Propane Gas systems Propane, and LP gas piping & regulator pressures. Natural gas, propane, and LP gas gas pressures at appliances
  • POST a QUESTION or READ FAQs about LP gas pressure, propane gas pressure, and natural gas pressure in piping, at regulators, at appliances
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LP or Propane Gas Tank Pressures:

Here we give the standard pressure ranges and pressure settings for LP gas, propane gas.

What are the common operating pressures of natural gas and LP or "liquid petroleum" gas in the building gas piping and at the appliance? Since there several ways that people express gas pressures we include more than on description of common LP gas or natural gas system operating pressures in this article.



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What is pressure LP or LPG "liquid petroleum" gas inside the gas tank?

There is some confusion, even among LP gas service technicians about just what is the pressure inside the gas containers they deliver to or fill at properties. Perhaps this is because the gas laws explain that the vapor pressure of LP-gases varies as a function of temperature.
See BOYLE's LAW discussed at this website.

"Vapor pressure" is the force exerted by a gas, LP gas in this case, attempting to escape from a container (say by pressing on the container's interior surfaces, or exiting at a gas valve if the gas valve is opened and not regulated). Some typical vapor pressures of LP gas (propane) are given just below. These pressures vary in real life depending on the purity of the gas and the percentage mixture of propane and butane.

Butane is generally going to show a much lower vapor pressure in the container than propane. But you can see from the table that as outdoor temperature varies between zero and 80 deg. F., the pressure of LP gas in the outdoor tank varies widely, from about 28 psi to as much as 140 psi.

Since the temperature affects the vaporization rate of LP gas stored at a property, you can understand that your full LP tank will appear to "last longer" in warmer weather not just because your heating boiler is not drawing on the tank, but because of the higher outdoor temperature.

Vapor Pressure of LP Gas in a Container (in PSI)

Ambient Temperature Percent Propane (left) to Percent Butane (right)
DegF 100% 80/20 60/40 50/50 40/60 20/80 100%
-40 3.6 - - - - - -
-30 8 4.5 - - - - -
-20 13.5 9.2 4.9 1.9 - - -
-10 20 16 9 6 3.5 - -
0 28 22 15 11 7.3 - -
10 37 29 20 17 13 3.4 -
20 47 36 28 23 18 7.4 -
30 58 45 35 29 24 13 -
40 72 58 44 37 32 18 3
50 86 69 53 46 40 24 6.9
60 102 80 65 56 49 30 12
70 127 95 78 68 59 38 17
80 140 125 90 80 70 46 23
90 165 140 112 95 82 56 29
100 196 168 137 123 100 69 36
110 220 185 165 148 130 80 45

Source: "LP Gas Serviceman's Handbook", cited at references below.

Gas Cylinder or Tank Regulators: Readers concerned with installing, inspecting, or testing LP Gas regulators which are found on outdoor above ground or buried gas cylinders used for storage of LP Gas on site should also
see GAS REGULATORS for LP TANKS

Gas Appliance Regulators: Readers concerned with installing, inspecting, or testing LP or Natural Gas regulators which are found on appliances such as LP or Natural Gas fired boilers, furnaces, water heaters or appliances should also
see GAS REGULATORS for APPLIANCES

Readers concerned with changing the fuel type between LP gas and natural gas for a gas fired appliance should see our safety warnings
at GAS APPLIANCE CONVERT LP-NATURAL GAS.

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Continue reading at GAS REGULATORS for LP TANKS or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see GAS REGLATORS, TWO STAGE

Or see GAS PRESSURES LP vs NATURAL GAS

Suggested citation for this web page

LPG PROPANE TANK PRESSURES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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