(i) These regulations cover both hot finished and cold drawn seamless
boiler, superheater and heat exchanger tubes of ferritic and
austenitic alloy steel grades.
These shall conform in all respects with the
requirements herein specified.
seamless tubes conforming to other national/international
standards which are known to be commonly used as being
suitable for use as boiler and superheater tubes can also be
used with the designations of the national/international
standards, provided such materials are not specifically
prohibited by the regulations.
While making tubes to other national/internationals
standards the allowable stresses of the respective standard
shall be strictly followed while designing the tubes.
The design metal temperatures shall not exceed the following
Degree C(Degree F)
T9, T11, T12, T22, T91,
304, TP 304H, TP 304L, TP 310S, TP 316, TP316H,
316L, TP321, TP321H, TP347, TP347H