The other option, run a single large pipe. Stock it was probably just under 2' so try to run 2 3/4' (like 90s GM 'F' bodies). The thinking behind the big single is performance and sound. Won't 'rat-tat-tat' like straight pipes or glasspacks, mid range performance should be notable over open pipes. Think muffler from a 3/4-1 ton truck. RUN PIPE SIZES Outlet sizes 6' and less fit a number of run pipe sizes, and the fittings are marked accordingly. See page 30 for Pipet Consolidation Chart. SCHEDULES Pipe schedule numbers and weight designations are in accordance with ASME B36.10. FLATS A flat Butt-Weld Pipet fitting for use on welding caps, elliptical heads and flat.
This pipe thickness calculator calculates required pipe thickness for a process pipe based on ASME B31.3 Code. Detail information about behind the back calculations is given at the end of this calculator.
This calculator calculates required thickness of a pipe under internal pressure based on criteria specified in section 302.1.1 and 302.2.2 of ASME B31.3 Pressure Piping Code.
Input Required
- Pipe material of construction.
- Pipe NPD.
- Pipe construction type : Seamless, EFW, ERW etc.
- Design temperature.
- Design Pressure.
- Corrosion allowance for material and operating conditions.
- Mechanical allowance.
- Mill tolerance.
As we know, ASME B31.3 Provides formula and guidelines for calculation of pipe under pressure. Though the formula is quite simple, finding correct values of individual factors can be tricky sometimes. This process pipe thickness calculator uses following formula for calculation of wall thickness.
304.1.2 (a) equation 3a :
- Seamless Pipes : Design Thickness t = (PD)/2(SE+PY)
- Welded Pipes : Design Thickness t = (PD)/2(SEW+PY)
Where :
P : Internal Design Guage Pressure
D : Outside diameter of pipe
In this calculator, outside diameter is taken from American Pipe Standards for the selected nominal pipe diameter :
- ASME B36.10 : Welded and Seamless Wrought Steel Pipe.
- ASME B36.19 : Stainless Steel Pipes.
S : Allowable Stress value for material from Table A-1
These are allowable stress values for different materials at different temperatures. Provided in Table A-1 of ASME B31.3. I have included commonly used pipe materials in this calculator. If you want more ASTM materials to be included, please mention in comments section below.
E : Longitudinal Weld Joint Quality factor
- Applicable as per ASME B31.3 Table A-1A or A-1B .
- 1 For Seamless Pipes.
- 0.60 for Furnace Butt Welded Pipes.
- 0.85 for Electric Resistance Welded Pipes.
W : Weld Joint Strength Reduction Factor
- Applicable as per Para 302.3.5(e) of ASME B31.3
- It is applicable only for Welded pipes.
- W is Take as 1 for Seamless Pipes.
- Value of W is taken as 1.0 at temperatures of 510°C (950°F) and below, and 0.5 at 815°C (1500°F) for all materials.
- Value is linearly interpolated for intermediate temperatures.
Y : Coefficient from Table 304.1.1,
Valid for t < D/6 and for materials shown. The value of Y may be interpolated for intermediate temperatures.
Addition of Allowances
Calculated Design Wall Thickness should be added with Corrosion Allowance, Mechanical Allowance for Grooving, Threading etc and Manufacturing Tolerance to arrive at final value. Next higher standard thickness value from Pipe Standards such as ASME B36.10 and ASME B36.19 is used.
Required Thickness = Design Thickness + Allowances.
Wall Thickness Selection
Designer should select a thickness from schedules of nominal thickness contained in Table 1 specified in ASME B36.10 and B36.19, to suit the value computed to fulfill the conditions for which the pipe is desired.
Please provide your comments / suggestions in comments box below.
Minimum thicknesses between Elbows and Straight Pipe
Minimum thicknesses between Elbows and Straight Pipe
Greetings,
...I'd like to know if exists some criterion that let me say that the allowable minimum thickness in an elbow must be greater than allowable minimum thickness in a straight pipe for its replacement due to that the elbows are points with erosion rate higher than straight pipes.
...It's to say, I've been reading and analysing this situation since the point of view of security, where any system based on high pressure and temperature requires to define critical leves of replacement.
...Thank you in advance for your opinions
...I'd like to know if exists some criterion that let me say that the allowable minimum thickness in an elbow must be greater than allowable minimum thickness in a straight pipe for its replacement due to that the elbows are points with erosion rate higher than straight pipes.
...It's to say, I've been reading and analysing this situation since the point of view of security, where any system based on high pressure and temperature requires to define critical leves of replacement.
...Thank you in advance for your opinions