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A boxlike structure to the longitudinal drum of a sectional header boiler for connecting circulating tubes.



Related Terms

MUD DRUM

A pressure chamber of a drum or header type located at the lower extremity of a water tube boiler and fitted with blowoff valve.

MUD OR LOWER DRUM

A pressure chamber of a drum or header type located at the lower extremity of a water- tube boiler convection bank which is normally provided with a blowoff valve for periodic blowing off of sediment collecting in the bottom of the drum.

CROSS BOX

A boxlike structure for the connection of circulating tubes to the longi The angular speed at which a rotating shaft becomes dynamically unstable with large lateral amplitudes, due to resonance with the natural frequencies of lateral vibration of the shaft.

LONGITUDINAL SEAM

A riveted or welded seam along the longitudinal axis of a boiler shell or drum.

RISER TUBE

A tube through which steam and water pass from an upper waterwall header to a drum.

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.

CROSS DRUM BOILER

A sectional header or box header type of boiler in which the axis of the horizontal drum is perpendicular to the axis of the main bank of tubes.

DRUM INTERNALS

Fittings located inside the boiler drum used to separate water and steam, distribute feed water and chemicals, and provide for removal of impurities.

LONGITUDINAL DRUM BOILER

A boiler in which the axis of the horizontal drum is parallel to the tubes, both lying in the same plane.

BOX HEADER BOILER

A horizontal boiler with a front header and rear inclined rectangular header connected by tubes.

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