Minimum Tube Sheet Thickness

[chbake]

Per ASME code, or appropriate TEMA standards, is there a design calculation for the minimum tubesheet thickness required in the fabrication of a Fire Tube Boiler? Any thoughts would be greatly appreciated.

 

[kenvlach]

I'm not a MechE nor familiar with fire tube boilers per se, but I know ASTM A213 is used for water tubes, so perhaps for fire tubes as well:
"A213/A213M-01a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes"
"1.1 This specification covers minimum-wall-thickness, seamless ferritic and austenitic steel, boiler and superheater tubes and austenitic steel heat-exchanger tubes, designated Grades T5, TP304, etc.

1.2 Grades S30432, TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP310HCbN, TP316H, TP321H, TP347H, TP347HFG (fine grained) and TP348H are modifications of Grades TP304, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and are intended for high-temperature service, such as for superheaters and reheaters.

1.3 The tubing sizes and thicknesses usually furnished to this specification are 1/8 in. [3.2 mm] in inside diameter to 5 in. [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification."

http://www.astm.org/cgi-bin/SoftCar...cs/astm.org/DATABASE.CART/PAGES/A213A213M.htm

 

[kenvlach]

There are many more ASTM standards that may apply, depending upon material and method of fabrication. Go to the ASTM site and do a search for ‘Boiler.’

http://www.astm.org/cgi-bin/SoftCart.exe/STORE/standardsearch.shtml?L+mystore+odqx6084+1044509380

There are 177 ASTM standards listed for 'Boiler' (only 11 if only do ‘Boiler tubes’). These may be helpful:
A1012-02 Standard Specification for Seamless and Welded Ferritic, Austenitic and Duplex Alloy Steel Condenser and Heat Exchanger Tubes With Integral Fins
A1020/A1020M-02 Standard Specification for Steel Tubes, Carbon and Carbon Manganese, Fusion Welded, for Boiler, Superheater, Heat Exchanger and Condenser Applications
A178/A178M-02 Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes
A192/A192M-02 Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service
A209/A209M-98 Standard Specification for Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes
A210/A210M-02 Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes
A213/A213M-01a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
A249/A249M-02 Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
A250/A250M-95(2001) Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes
A450/A450M-02 Standard Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
B608-02 Standard Specification for Welded Copper-Alloy Pipe
F1155-98 Standard Practice for Selection and Application of Piping System Materials

 

[deanc]

If this is a ASME Stamped Boiler,the "ONLY" acceptable design method is given in ASME Sec I parts PG and PFT. Please see PFT-9.2.1

 

[kyong]

Although ASME Section VIII Div 1 Appendix AA and TEMA provode calculations for tubesheet, I think ASME Section I should be applied to this particular application because it's a boiler as mentioned by deanc.