Boiler Header Description

1. Boiler system primary mains (headers and secondary piping manifolds) are critical components of a successful modular boiler system. Quite often, very little time and thought is spent here.

2. Unless there is a compelling reason for fabricating mains at the jobsite, it is likely that Superior can manufacture our standard Primary-Secondary mains more efficiently, less expensively, and with higher quality and precision.

3. Mains can be made in copper or steel and include a header with three Control Bushings and per each boiler two Ball Valves (installed), and one set of Supply and Return Manifold Piping, (shipped loose). All headers are tested at 125psig.

4. Achieving the proper results with Primary Secondary Piping requires knowledge of the application objectives, limitations imposed by other equipment in the building, limitations of the boiler room, and knowledge of applicable building and boiler room codes.

5. So, qualified engineers and designers, as well as all applicable local building and boiler codes, should be consulted prior to implementing a system design.

Boiler steam header classification

Downcomers are pipes leading from the top to the bottom of the boiler. Downcomers carry the water from steam drum to the bottom part of the boilers where it enters the distribution headers to be heated in the combustion zone.

Risers are pipes leading from the bottom to the top of the boiler. Water and steam generated in the combustion zone, runs through the risers up to the steam drum. Steam is separated in steam drum and water sent to distribution header through downcomers and the cycle is repeated.

Distribution headers are big pipe headers that transfer water from the downcomers to the risers through a combustion zone where the water gets partially heated to steam from the heat of fuel combustion.

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