This is the third of three volumes of essential reference for those concerned with the installation and servicing of domestic and industrial gas equipment. This volume deals with the various aspects of installing and servicing industrial and commercial appliances and associated equipment. The many illustrations in the book serve to explain points of technical complexity and the volume is an invaluable, practical source of reference. This third edition is brought fully up to date to incorporate recent developments, which include: The increase in the use of mobile catering equipment; The new internal gas regulation documents UP1 and UP2; and New energy source, liquefied petroleum gas (LPG).