(1) U-bend tube for high pressure feed water heater: Used in auxiliary machinery & high pressure feed water heater; Standard: ASME SA-556 or agreement; Grade: SA-556, Gr. B2, C2, TP304 etc. OD: 5.9-25.4MM WT: 1.5-3MM

(2) U-bend tube for low pressure feed water heater: Used in auxiliary machinery & low pressure feed water heater; Standard: ASME/ASTM or agreement; Grade: TP304 etc. OD: 15.9-25.4MM WT: 0.7-3MM.

(3) U-bend tube: Used in heat exchanger for petrochemical equipment; Standard: Agreement; OD: 12-38.4MM WT: 0.7-3MM.