Wall Thickness

which NPS you have ?

make sure to consider corrosion allowance & mill tolerance in your calculations

It's 6 inch.

The corrosion allowance and the mill tolerance, are included.

If each alternative satisfies the specifications, then it makes sense to use the most economical. The Sch 40 might be heavier than you need, but it might cost less as a more commonly available size.

It's better adopting the standard sizes available. Go for 6" SCh. 40

Regards,

Ashfaq Anwer

http://thepetrostreet.com

Does the wall thickness calcualted by you includes the corrosion allowance and 12.5% mill tolerance.

If the above discussed has been included in your calculations then go for the schedule just immediatly high from your calculated thickness that is available in the market.

This is the engineering practice which is normally followed.

Best Regards

Ikram Ali Khan

Pipe has a pretty good tolerance allowance.

4.39mm and 4.4mm is pretty much the same thing. I would assume that the 4.4mm is just the 4.39mm rounded up. You should be able to use 6" STD Black pipe.

But why are you chosing the STD whitch is at 7.1mm wall thickness, however there is five wall thicknesses(4.4, 4.8, 5.2, 5.6, 6.4mm) before this STD.

You can use the thickness which covers the min. required per code, taking into consideration the corrosion and erosion allowances. For more details, see a solved examples through the following CR4 Threads:

• In service pipe thickness limits (Post #4),

• Schedule of pipe,

• Maximum Wall Thickness for Seamless Pipe,

• Pipe minimum allowable thickness,

• Significance of "-Mill Tolerance" in the Piping Stress Analysis &

• Pipe Wall Thickness.

sir,

as the pressure is low enough, you can use the designed pipe. In this application you can use it without further calculations.

kiran

Thank you guys for your answers,

I think I'll opt for (4.8mm), whitch satisfied the requirment of the code, and be cheapper than the STD wall.

Any comment?