Carbon Steel ASME Standard Boiler Manifold Headers Boiler Spares For Hrsg Boiler

Boiler Header ( BOX ) Description

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.

Benefits

• Allows for considerable functionality in a very economical space
• Ensures proper piping for safer installations
• Facilitates quick, clean installation for the heating professional
• Means faster, easier system service once installation is complete

Full strength (stick-through)

• This is the most common joint style utilized today and can be applied to a variety of coil designs.
• The joint is utilized in single or multiple row harp configurations and for both straight tube sidehill and bent tube radial layouts. A variety of hole bevels are used depending on joint configuration.
• They range from step bevels to constant depth bevels.

Full penetration

• The full penetration tube to header weld is also a common joint style, particularly in superheaters and reheaters.
• The full penetration (full tube wall thickness) is accomplished by either a straight tube bore with the tube saddled on to the header or by spot face machining of the header to allowing more of a butt weld configuration.

Fabrication Expertise That makes a Difference

• With 22 years of header fabricating experience, DHB knows the design and workmanship procedures that are required to successfully manufacture high alloy headers.
• Some material types must also be processed very carefully, in particular P91 Cr-Mo and 2205 duplex stainless. Both of these material types are susceptible to weld cracking during fabrication unless special care and fabrication techniques are employed. Additionally, trace elements must be controlled in the base and weld-filler materials to ensure proper metallurgy.

Specification

Detailed Picture