Allowable Stress for Boiler Design
Allowable Stress for Boiler Design
(OP)
Dear all,
I have a question on allowable stress.
I can understand how the allowable stresses are obtained from Ultimate tensile strength (UTS/3.5) and yield strength (YS/1.5). However, I do not understand how allowable stress is obtained by using creep value.
Please help.
Thanks very much,
Aida Hannah
I have a question on allowable stress.
I can understand how the allowable stresses are obtained from Ultimate tensile strength (UTS/3.5) and yield strength (YS/1.5). However, I do not understand how allowable stress is obtained by using creep value.
Please help.
Thanks very much,
Aida Hannah





RE: Allowable Stress for Boiler Design
(b) At temperatures in the range where creep and
stress rupture strength govern the selection of stresses,
the maximum allowable stress value for all materials is
established by the Committee not to exceed the lowest
of the following:
(1) 100% of the average stress to produce a creep
rate of 0.01%/1,000 hr
(2) 100Favg% of the average stress to cause rupture
at the end of 100,000 hr
(3) 80% of the minimum stress to cause rupture at
the end of 100,000 hr
RE: Allowable Stress for Boiler Design
"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick
RE: Allowable Stress for Boiler Design
Javed Nasir
Inspection Engineer
Technip-France Abu Dhabi