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A handhole enclosure.

Related Terms

HANDHOLE

An inspection, a sight, or a cleanout opening in a boiler; often elliptical and closed by a handhole plate.

BOILER HEADER (BOX)

A pressure part of the boiler consisting of a flat tube sheet into which the ends of the water tubes are rolled. In a parallel plane is a tube cap or handhole sheet. The two sheets are spaced about 4 to 8 in. or more apart. The top and bottom and both ends are flanged together and riveted or may be closed by a narrow flanged strip of plate riveted to each sheet. Circulating nipples connect the top of the header and drum, or the header may be flanged and riveted directly to the drum. Welding would be used today instead of rivets.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

FILTER HOUSING

A ported enclosure that directs the flow of fluid through the filter element.

HOUSING

A ported enclosure which directs the flow of fluid through the filter element.

PLENUM

An enclosure through which gas or air passes at relatively low velocities.

EXPLOSION-PROOF

An enclosure which will withstand an internal ignition of a flammable gas and which will prevent the transmission of any flame able to ignite a flammable gas which may be present in the surrounding atmosphere.

FLAME-PROOF

An enclosure which will withstand an internal ignition of a flammable gas and which will prevent the transmission of any flame able to ignite a flammable gas which may be present in the surrounding atmosphere.

WATER-COOLED FURNACE

A furnace that is constructed with tubes throughout its enclosure and has water circulating through the tubes for cooling purposes.

DRY DOCKING

To remove the vessel from the water by placing it in a walled enclosure and pumping it dry. The vessel is supported from the localised pressure on its keel and chine by chocks and side shores.
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