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In order to reduce the viscosity of fuel oil, it is necessary to ___.

In order to reduce the viscosity of fuel oil, it is necessary to ___.

A low water fuel cutoff is located slightly below the NOWL.

A negative pressure reading in a manometer is indicated if the level of the liquid in the leg connected to the breeching is ___ to the atmosphere.

A negative pressure reading in a manometer is indicated if the level of the liquid in the leg connected to the breeching is ___ to the atmosphere.

___ is the amount of fuel a burner is capable of burning in a given unit of time.

Many heating services use condensate as a heating fluid.

Flame failure can cause a furnace explosion from the buildup and ignition of fuel.

Usual protection devices used in a heat exchanger to prevent overpressure from thermal expansion are either a thermal expansion safety relief valve or a rupture disc.

___ combines with oxygen to form sodium sulfate, which accumulates at the bottom of a boiler.