Liquefied Petroleum gas or LPG for short comes in two types and is commonly sold as commercial Butane and Commercial Propane. Calor Gas (sold in blue cylinders) and Calor Propane (sold in red cylinders) are the two most widely available brand names in the UK. LPG is produced as a by-product of making petrol from crude oil or comes directly from the Gas or Oil fields.
In use the two gases are effectively the same however Propane has a lower boiling point that means that can be used at a lower temperature. It also needs to be stored at a higher pressure. The two gases also have different operating pressure to counteract the different calorific values. In the UK appliances operating on Butane do so at a pressure of 28 millibars and Propane at 37 millibars.
It is not generally possible to change from one fuel to the other without changing the regulator, hence the cylinders and regulators have different threads and fittings to avoid mishaps. As a point of interest butane has a higher calorific value and a slighter hotter flame temperature.
More information
Follow the links below for further information on Marine Gas installation:
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Calor Home Page
You the Gas Installer
