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The automatic valve which prevents connection between the air receiver and air start manifold unless actually in the process of starting. This minimises the risk of an explosion in the air manifold actually propagating back to the air receiver where a much more severe explosion is possible.

Related Terms

ANTISTATIC ADDITIVE

An additive that increases the conductivity of a hydrocarbon fuel to hasten the dissipation of electrostatic charges during high-speed dispensing, thereby reducing the fire/ explosion hazard.

EXPLOSION

Uncontrolled rapid combustion. Most substances expand when heated. Evaporation caused rapid expansion. Burning of the vapour causes heating and even greater expansion and if the expansion is confined, pressure may increase still further, RESULT - EXPLOSION.

FURNACE EXPLOSION

A violent combustion of dust or gas accumulations in a furnace or combustion chamber of a boiler.

PUFF

A minor combustion explosion within the boiler furnace or setting.

EXPLOSIVES ACT

A federal law that regulates any substance that is made, manufactured or used to produce an explosion or detonation or a pyrotechnic effect and includes gunpowder, propellant powders, blasting agents, dynamite, detonating cord, lead azide, detonators, ammunition, rockets, fireworks, safety flares or other signals.

MAIN STARTING AIR VALVE

The automatic valve which prevents connection between the air receiver and air start manifold unless actually in the process of starting. This minimises the risk of an explosion in the air manifold actually propagating back to the air receiver where a much more severe explosion is possible.

PRESSURE/VACUUM RELIEF VALVE

A valve which permits the release or intake of air in to or out of a tank only when the pressure or vacuum within the tank exceeds the preset limits of the valve. This can prevent tank explosion or implosion when loading or discharging a tank.Pressure/Vacuum (PV) Relief Valve

PV RELIEF VALVE

A valve which permits the release or intake of air in to or out of a tank only when the pressure or vacuum within the tank exceeds the preset limits of the valve. This can prevent tank explosion or implosion when loading or discharging a tank.

BALL PENDULUM TEST

A test for measuring the strength of explosives; consists of measuring the swing of a pendulum produced by the explosion of a weighed charge of material.

BLOCKHOUSE

1. A reinforced concrete structure, often built underground or half-underground, and sometimes dome-shaped, to provide protection against blast, heat, or explosion during rocket launchings or related activities, and usually housing electronic equipment used in launching the rocket. 2. The activity that goes on in such a structure.
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