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A drilled hole filled with concrete and lined with a cylindrical steel casing if needed.



Related Terms

REAMING

Enlarging a hole by revolving a cylindrical cutting tool through it.

DRIVEPIPE

A thick-walled casing pipe that is driven through overburden or into a deep drill hole to prevent caving.

BULGE

A local distortion or swelling outward caused by internal pressure on a tube wall or boiler shell due to overheating. Also applied to similar distortion of a cylindrical furnace due to external pressure when overheated, provided the distortion is of a degree that can be driven back.

BOILER DRUM

A cylindrical shell closed at both ends, designed to withstand internal pressure.

OIL TIP

Part of the oil gun which discharges the atomized fuel oil mixture into the furnace through multiple openings. The hole pattern in the tip has a great effect on flame size and shape.

SAFETY VALVE DRAIN

A hole of at least 3/8 in diameter required through the body below the valve-seat level in safety valves larger than 2-in diameter; used to prevent condensate from collecting at this point.

PUMP PRESSURE RELIEF VALVE

Positive displacement pump systems are fitted with a relief (regulating) valve for adjusting pump discharge pressure and to avoid the possibility of rupturing the pump casing or discharge pipe.

SHELL

The cylindrical portion of a pressure vessel.

HYDRAULIC CYLINDER

A hydraulic actuator of linear type. Consists of sealed cylindrical body with oil admission ports and piston connected to actuating rod. Direction of linear piston & rod movement depends on which side of piston working fluid supplied.

CASING

A covering of sheets of metal or other material such as fire resistant composition board used to enclose all or a portion of a steam-generating unit.

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