These collect the product gases generated within the Reformer Tubes or Cracking Tubes. The operating conditions are different from furnace tubes as there is no firing from outside and no reaction inside even though the temperatures and pressures are same as furnace tubes. However, they have to withstand severe stresses particularly during start-ups and shut-downs due to the constraints imposed by the tight connections. Hence, the materials of the manifold should have supplied strentgh and ductility at the operating temeratures as well as thermal shock resistance.

The most popular alloy for this application is 20Cr-32Ni-Nb (Cast version of Alloy 800)
Other alloys like 25Cr-35Ni-Nb (Low C) are also used.
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