HEADER

PLUG HEADER
The plug header is the most commonly used up to 350 bar working pressure. The plug hole opposite each tube allows expansion of the tube in the tube sheet, mechanical cleaning, and plugging in case of leakage. Seal welding or strength welding can be provided for high partial hydrogen pressure services resulting in a less expensive solution than the use of pipe header generally used for over 200 bar service pressure.

COVER PLATE HEADER
The cover plate header is used for fluids with high fouling factors up to 40 bar maxi when frequent mechanical cleaning is necessary.

It is used for very corrosive process fluids so as to periodically check the corrosion allowance. Special cover plate headers using welded gaskets are provided for hydrogen service units in hydro cracking plants.