Air cooler for hydrogen process application having special header design and repair procedure

摘要

A tube-tubesheet connection suitable for an air cooler comprises an inlet header (3, Fig. 5), rear header (13, Fig. 5) and outlet header (12, Fig. 5) with tubes connecting to the headers with a tube-tubesheet connection 9 and plugs 2 in the headers opposite the tube-tubesheet connections; the tubes having a threaded groove where the tube connects with the header and a cap 11 having a corresponding threaded groove so that the cap 11 can be tightened onto the tube to seal leaks at the tube-tubesheet connection 9. Leaks at the tube-tubesheet connection can be sealed without cutting or disassembly of the header by screwing the cap onto the tubesheet connection by means of a tightening tool (10, Fig. 8) inserted through the plugged hole opposite the tube end to be sealed.