In 3rd Class Power Engineering ASME code calculations you’ll be required to know how to calculate the minimum required thickness of a boiler drum. The information provided below helps explain the material covered in:

All referenced page numbers below are from the **2007 ASME Boiler & Pressure Vessel Code.**

## Formula

To calculate the minimum required thickness of a boiler drum required for various applications you will use a formula contained within ASME Boiler & Pressure Vessel Code PG-27 Cylindrical Components Under Internal Pressure *page 10*. Specifically PG-27.2.2 *page 10*

**PG-27.2.2 Piping, Drums, and Headers. (based on strength of weakest course)** *It is important to remember any cylinder with an outside diameter less then 125mm is to be considered tubing and the equation provided in PG-27.2.1 page 8 must be used.*

**PG-16.3 Minimum Thicknesses** *It is also important to note that according to PG-16.3 that the minimum thickness of any boiler plate under pressure shall be 1/4in (6mm) except for electric boilers constructed under the rules of Part PEB*

**PG-27.2.2 Formula to calculate the minimum required thickness:**

**Outside Diameter Equation**

**Inside Radius Equation**

## Formula Variables

The symbols used within the PG-27 formulas are contained within paragraph PG-27.3 *page 10* and are defined as follows.

C = Minimum allowance for threading and structural stability (mm) (PG-27.4, note 3) *page 11*

D = Or O.D. is Outside diameter of cylinder (mm) “In this case piping”

E = Efficiency of longitudinal welded joints or of ligaments between openings, whichever is lower (the values allowed for E are listed in PG-27.4, note 1) *page 11*

e = Thickness factor for expanded tube ends (mm) (see PG-27.4, note 4) *page 11*

P = Maximum allowable working pressure “Gauge Pressure” (MPa) (see PG-21, refers to gauge pressure)

R = Inside radius of cylinder (mm) “In this case boiler drum”

S = Maximum allowable stress value at the operating temperature of the metal (Section II, Part D, Table 1A. See PG-27.4, note 2) *page 11*. It is important when determining the maximum allowable stress value to check (PG-6 plate materials) *page 4* and (PG-9 boiler tube materials) *page 5* before starting calculations as this information will determine the correct stress table to use by indicating whether the material is carbon steel or an alloy steel.

t = minimum required thickness (mm) (see PG-27.4, note 7) *page 12*

y = temperature coefficient (see PG-27.4, note 6) *page 11*

## How To: Calculate The Minimum Required Thickness Of A Boiler Drum Questions

*Note: All code questions are to be calculated in (mm) and (MPa) unless otherwise stated. Convert accordingly and properly before the calculation.*

How To Determine The Minimum Required Thickness Of A Boiler Drum Question #9

How To Determine The Minimum Required Thickness Of A Boiler Drum Question #10

## Summary

If you have any questions regarding how to calculate the minimum required thickness of a boiler drum let me know in the comment section below and I’ll be sure to provide additional insight or reference material.

Thanks everyone,

Power Engineering 101

SAMANT SINGHi am desgning a mini steam generator for my college project and i dont have access to asme bpvc codes so can you help me with the material that i should use to design a boiler drum for operating pressure upto 5 bar,the design resembles babcock and wilcox boiler and operating temprature being 400 C.so can you please recommend a material along with its yield strength values at 400C temprature,i have used the second formula for calculation of drum thickness the only unknown is allowable stress (S).

plz reply urgently.

Xamir SuarezHello, Samant Singh

The elastic limit of the recommended material for this application can be seen in ASME BPVC, Section II, Part. D

To see a selection of material you can see ASME BPVC Section I, Parag. PG-6

Send me an email to x.suarez.a@gmail.com and I can help you better

regards

Philip[Where do you Find the S Value. I have the ASME Vol. 1 extract and cant see it.