Welded Header (D-Type) The welded header is mainly used for clean products or vacuum pressure conditions. The tubes are welded into tube sheets to which the bonnet-type header with the necessary nozzles is welded. | |  |
Cover Plate Header (with through bolts)The header features a removable cover plate with through bolts for easy inspection and tube cleaning. It is normally sufficient to remove a pipe bend for inspection, since the removal of the bend allows the examination of part of the tube array. Tubes may be weld connected or expanded. | |  |
Cover Plate Header (with stud bolts) The cover plate header with stud bolts features top or bottom nozzles to allow cover removal without disassembly of the piping. Nozzles may alternatively be integrated in the cover. The header is fit for a maximum pressure of 50 bar depending on fluid temperature and the type of sealing. A non-standard header design is required for higher pressures. Tubes may be weld connected or expanded. | |  |
Plug-Type Header Tubing is usually connected to plug-type headers by expansion, but may also be weld-connected to the tube sheet. A threaded plug with a soft iron gasket is provided opposite each tube and may be removed for further tube expansion or tube cleaning. As nozzles are top or bottom mounted, piping does not need to be disassembled for inspection or cleaning. The plug-type header is normally used for high-pressure applications. | |  |
High-Pressure Header with Return Segments A threaded plug with a soft iron gasket is located opposite each tube. The plug may be removed for further tube expansion or for tube cleaning. |
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High-Pressure Header with Welded Return Bends The two high-pressure headers are ideal for high temperature differences, since each tube can expand and contract independently. |
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