LPG is both liquid and gas in a cylinder with liquid at the bottom and gas at the top, as shown in the accompanying image.

If the cylinder is exposed to excessive heat, the LPG pressure relief valve allows the gas to vent and keep the pressure within safety limits.

The level of fill in the gas bottle comes into play when the LPG is being used, as it affects the rate of LPG vapourisation.

It should also be noted that natural gas and LPG appliances operate at different pressures, with 1.1 kPa and 2.75 kPa, respectively.

Steve is a technical advisor to Standards Australia and Gas Energy Australia (GEA), and an active member of the World LPG Association (WLPGA), contributing to global standards and technical reviews. He holds a BSc. (Hons) in Industrial Chemistry from UNSW and has held senior safety and technical roles at ELGAS, making him a trusted authority in LPG safety and standards.

So, not only wouldn’t it approach bursting pressure (≈ 1,000 PSIG) but, under normal circumstances, it would never even reach the 375 PSIG required to trigger the pressure relief valve.

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The pressure relief valve is integrated into the main gas valve on the bottle, as shown in the accompanying picture. It’s actually a safety valve within a valve.

The pressure of LPG (propane) goes from 0 kPa (0 PSIG or 0 bar) at -43ºC to 2482 kPa (360 PSIG or 24.8 bar) at 70ºC and higher.

The term “pressure” refers to the average force per unit of area that the gas exerts on the inside walls of the gas bottle.

So, the cylinder would never actually go above this, as the valve would open and lets some gas escape, limiting the pressure inside the cylinder.

LPG gas pressure refers to the average force per unit of area that the LPG gas exerts on the inside walls of the LPG gas bottle.

An LPG pressure regulator reduces the higher pressure from the gas bottle tp a gas regulator pressure at 2.75 kPa, the actual safe working pressure of the gas appliances. The LPG pressure regulator reduces and maintains the safe operating pressure.

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Steve Reynolds is a leading expert in the LPG industry with over 22 years of experience. As part of the national management team at ELGAS, Steve ensures the safe and efficient storage, handling, and transportation of LPG. He serves as the lead investigator for incidents and collaborates with authorities on industry developments.

As previously mentioned, the pressure is 0 kPa (0 PSIG or 0 bar) at -43ºC and goes up to 2482 kPa (360 PSIG or 24.8 bar) at 70ºC.

As LPG is a liquefied gas, the vapour pressure inside the cylinder will remain the same from full until the last of the liquid LPG is vaporised.

LPG BoilingDid you know that every time you turn on one of your gas appliances, the LPG in your gas bottles starts to boil?

The Zurn Wilkins DUXLM Dielectric Union is installed on potable water lines to protect against piping system deterioration caused by galvanic and stray current corrosion.