Maintenance
(31) Maintenance means the performance of services on fire protection equipment and systems to assure that they will perform as expected in the event of a fire. Maintenance differs from inspection in that maintenance requires the checking of internal fittings, devices and agent supplies. (32) Multipurpose dry chemical means a dry chemical which is approved for use on Class A, Class B and Class C fires. (33) Outer shell is the exterior layer of material on the fire coat and protective trousers which forms the outermost barrier between the fire fighter and the environment. It is attached to the vapor barrier and liner and is usually constructed with a storm flap, suitable closures, and pockets. (34) Positive-pressure breathing apparatus means self-contained breathing apparatus in which the pressure in the breathing zone is positive in relation to the immediate environment during inhalation and exhalation. (35) Pre-discharge employee alarm means an alarm which will sound at a set time prior to actual discharge of an extinguishing system so that employees may evacuate the discharge area prior to system discharge. (36) Quick disconnect valve means a device which starts the flow of air by inserting of the hose (which leads from the facepiece) into the regulator of self-contained breathing apparatus, and stops the flow of air by disconnection of the hose from the regulator. (37) Sprinkler alarm means an approved device installed so that any waterflow from a sprinkler system equal to or greater than that from single automatic sprinkler will result in an audible alarm signal on the premises. (38) Sprinkler system means a system of piping designed in accordance with fire protection engineering standards and installed to control or extinguish fires. The system includes an adequate and reliable water supply, and a network of specially sized piping and sprinklers which are interconnected. The system also includes a control valve and a device for actuating an alarm when the system is in operation. (39) Standpipe systems. (i) Class I standpipe system means a 2 1/2 (6.3 cm) hose connection for use by fire departments and those trained in handling heavy fire streams. (ii) Class II standpipe system means a 1 1/2 (3.8 cm) hose system which provides a means for the control or extinguishment of incipient stage fires. (iii) Class III standpipe system means a combined system of hose which is for the use of employees trained in the use of hose operations and which is capable of furnishing effective water discharge during the more advanced stages of fire (beyond the incipient stage) in the interior of workplaces. Hose outlets are available for both 1 1/2 (3.8 cm) and 2 1/2 (6.3 cm) hose. (iv) Small hose system means a system of hose ranging in diameter from 5/8 (1.6 cm up to 1 1/2 (3.8 cm) which is for the use of employees and which provides a means for the control and extinguishment of incipient stage fires. (40) Total flooding system means a fixed suppression system which is arranged to automatically discharge a predetermined concentration of agent into an enclosed space for the purpose of fire extinguishment or control. (41) Training means the process of making proficient through instruction and hands-on practice in the operation of equipment, including respiratory protection equipment, that is expected to be used and in the performance of assigned duties. (42) Vapor barrier means that material used to prevent or substantially inhibit the transfer of water, corrosive liquids and steam or other hot vapors from the outside of a garment to the wearer's body.