shafqut hussain
Mechanical
I am training as a design Engineer and I have a problem that i am trying to understand.
I have seen engineers in my company designing a Tubesheet of a gas and waste heat powered steam boiler from section 1 asme of a 10 bar using PG 46 formula
T= pitch X sqrt ( pressure / (allowable stress X Corrosion allowance))
Allowable stress is calculated at 200 C of sa-516 Gr 70
The thickness they select for a 10 bar (3-4 TPH ) boiler is 16 mm
if i use ASME VIII-1 UHX-13 and UHX-13.4(a)(3). (design for Fixed Tube sheet ) i get a thickness for 44mm
I think ASME SECTION 1 does not accounts for thermal stresses developed and section VIII does that.
I suspect that my fellow engineer could be making a mistake somewhere.
which is the correct method for waste heat boilers and gas powered boilers ? Please advice?
why are there two different codes for a similar part ?
I have seen engineers in my company designing a Tubesheet of a gas and waste heat powered steam boiler from section 1 asme of a 10 bar using PG 46 formula
T= pitch X sqrt ( pressure / (allowable stress X Corrosion allowance))
Allowable stress is calculated at 200 C of sa-516 Gr 70
The thickness they select for a 10 bar (3-4 TPH ) boiler is 16 mm
if i use ASME VIII-1 UHX-13 and UHX-13.4(a)(3). (design for Fixed Tube sheet ) i get a thickness for 44mm
I think ASME SECTION 1 does not accounts for thermal stresses developed and section VIII does that.
I suspect that my fellow engineer could be making a mistake somewhere.
which is the correct method for waste heat boilers and gas powered boilers ? Please advice?
why are there two different codes for a similar part ?