Inch Diameter of a Pipe?

This could be surprisingly complicated, depending on what you mean exactly.

If you are simply converting from mm to inches, divide by 25.4, and then select the closest standard inch diameter, with regard to whether going slightly up or down in size.

If you are designing for flow at a certain pressure drop per length of pipe, you will need to use a pressure drop equation such as Darcy-Weisbach, in conjunction with a Moody Chart or some other means that accounts for pipe roughness and fluid Reynolds number. There are on-line pipe calculators based on several commonly used formulas.

For a crude reality check, rules of thumb such as liquid velocity of 3 m/s or gas velocity of 10 m/s can be used, but they are imprecise, especially at very small or large pipe diameters and fluid density/viscosity extremes.

This summary is all too brief, but it may serve as a start. It's a complex topic.

Sorry for a late reply.

Actually , I was looking for method to calculate welding progress for piping work having varied dia and thickness.

Thanks for your suggestions

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1. All pipe is to be made of a long hole, surrounded by metal or plastic, centered around the hole. Hole to be large enough to allow water or other stuff to come out the open end.

2. All pipe is to be hollow throughout the entire length - do not use holes of different length than the pipe.

3. The ID (Inside Diameter) of all pipes must not exceed their OD (Outside Diameter) - otherwise the hole will be on the outside.

4. The pipe is supplied with nothing in the hole, so that water, steam or other stuff can be put inside at a later date.

Mahesh, GA for correctly addressing the problem of OP. But it seems you are too much in hurry. Please start your sentences with Capital letter.

This "Inch Dia" unit for pipe is more prevalent for TIG welding at site, for stress relieving and NDT's like RT & UT also, but not for erection, where pipe length or tonnage is commonly used.

You cannot. It has been done.

according to ASME B 31.3 you can calculate the thickness of the pipe but u must have the diameter of this pipe

as you are mechanical engineer the sizing of the pipe must be submitted to you in the P&ID from the chemical engineer then u must calculate the thickness according to the rules in ASME.

Dear Mr. devendrapratapsingh37,

To my knowledge, the " inch dia" refers to or used for PIPING ERECTION CONTRACT WORK. In a Factory, where Expansion is taking place, or replacement of pipe lines done during maintanance - various pipe dia and lengths are involved.

Then HOW TO DECIDE THE CONTACT RATE PAYABLE TO THE CONTRACTOR on completion of the job, and inspected and certified as ACCEPTED.

The contractor will quote on INCH DIA BASIS - and for ONE METRE LENGTH of the PIPE.

For Example 2 Inch Dia, or 4 Inch dia. the RATE APPROVED on INCH-DIA/METRE x TOTAL LENGTH OF PIPE MADE or REPLACED will have to be paid. The Bends, Valves Tee etc. will be EXTRA and NOT COVERED in the INCH-DIA.

This Practise is Common in India.

DHAYANANDHAN.S