Pneumatic conveying systems are employed in many process industries where there are various possible sources of ignition and the consequent risk of a fire or dust explosion. The principal hazard arises from the pneumatic conveyance of materials from one area to another, on some occasions through fire compartment walls. Thus a source of ignition in one area has the ability to cause a fire in another, remote area. These recommendations outline the safety considerations for fire detection and suppression systems used in such applications.