Air Supplies

The purpose of the air maintenance device is to provide a__________ air supply to the system.

• regulated and filtered

• regulated and restricted

• warm and moist

• regulated and full flow

• restricted and full pressure

The purpose of the fast fill control valve on the air maintenance device is to_______.

• re-pressurize the dry system more quickly with greater airflow

• allow the dry system to trip more quickly

• blow out the system piping, when there is an obstruction

• fill the system with water more quickly when testing

• drain the system piping more quickly

The bypass valve on the air maintenance device are_______.

• normally closed when the system is in service

• partially open when the system is in service, to provide a restriction in the air supply

• normally open when the system is in service

• only opened during fire conditions

• only opened when testing the system alarms

Nitrogen may be used in lieu of air to pressurize dry and preaction systems. One reason why nitrogen is used because_________.

• it helps put out the fire more quickly

• it allows the system to trip more quickly

• it will plug leaks in the system piping

• it helps prevent corrosion of the system piping

• it prevents false tripping of the valve

The cut-in pressure for a compressor pressure switch is defined as the pressure when ________.

• the compressor starts

• the valve trips

• water reaches the test connection

• the sprinkler fuses

• the fire starts

When installing a tank-type compressor with isolator pads _______.

• torque the bolts to 90-ft lbs.

• do not draw the bolts tight

• install a locking compound, and torque the bolts tight.

• torque the bolts to keep the pads from absorbing vibrations

• draw the bolts tight to keep the compressor from moving

When installing the compressor and isolators are used__________.

• the piping must be restrained from movement with rigid type

  hangers

• extra heavy wall piping should be used to prevent air piping

  breakage

• a flexible hose should be installed between the compressor and service piping

• there must be 3 feet of clear space around compressor to allow for movement

• a housekeeping pad must be poured for the compressor

The air compressor utilized to provide the air supply for the system is_________.

• required to be listed

• is not required to be listed

• must be specifically listed for metallic sprinkler piping

• must be listed for industrial use

• must be listed for air maintenance of fire systems

The minimum pipe size for air supply piping is_______.

• 1/4"

• 1/2"

• 3/4"

• 1"

• 1 1/2"

The compressor pressure switch uses__________ pressure to turn the compressor on and off, by opening and closing electrical contacts that control the power to the compressor.

• air

• water

• tripping force

• static

• residual