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The drain connection including the pipe and the valve at the lowest practical part of a boiler, or at the normal water level in the case of a surface blowdown. The amount of water blown down.



Related Terms

SURFACE BLOWOFF

Removal of water, foam, etc. from the surface at the water level in a boiler. The equipment for such removal.

LOWEST PERMISSIBLE WATER LEVEL

The lowest water level in the boiler where the boiler can still be operated without damaging or overheating any part of the boiler.

DRUM WATER LEVEL LINE

The water level in the drum during the normal operating mode.

HEIGHT OF TIDE

Vertical distance from the chart sounding datum to the water surface at any stage of the tide. It is positive if the water level is higher than the chart sounding datum. The vertical distance from the chart sounding datum to a high water datum is called RISE OF TIDE.

LOW WATER FUEL CUTOFF

A safety device that will shut off the boiler burner operation if the water level in the boiler becomes too low.

TRY VALVE

One of three valves mounted on a boiler or water column within the visible range of the gauge glass and used to check the water level.

FEEDWATER REGULATOR

A device for admitting feedwater to a boiler automatically on demand. Practically a constant water level should result.

GAUGE GLASS

A glass-enclosed visible indicator of the water level in a boiler. Many gauge glasses are tubular, but modern high-pressure practice and railroad locomotives use two thick, flat strips of glass bolted between flanged plates, with the water and steam between the glass strips.

WET STANDBY

Boiler is filled completely with water or maintained at normal operating level with a positive nitrogen pressure of 35 to 70 kPa.

SHRINK

Sudden reduction in boiler water level as the steam production rate is decreased.

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