Table 1.

Operating conditions of the primary WHB.

	Shell Side	Tube Side
Type of fluid	Sec. Reformer Effluent Gas	Boiler Water (BW)
Design Pressure, MPa	3.6	11.8
Operating Pressure, MPa	3.07	10.55
Operating Temperature, °C	995 (inlet)/525 (outlet)	314
Tube Material	SA-179 (inner tube) SA-209 Gr T1a (outer tube)
Cap Material	SA-204 Gr B
Tube Size, mm	25.4 OD x 1.65 thickness, 8235–8845 Length (inner tube) 50.8 OD x 3.4 thickness, 7027–7637 Length (outer tube)
Number of Tubes, ea	421