Air receiver test pressure, shell thk, dished end thk

Consider design pressure as 10% more than operating pressure or minimum 0.7034kg/cm² more than the operating pressure.

For calcualting the shell thickness tell the material of construction, and diameter of the tank.

No it is not compulsory, infact the thickness required for dishends is generally lesser than shell thickness as the longitudinal stresses are governing.However the thickness is taken more considering the thinning during forming of the dishend.

Thnak you Mr. Nitin, MOC is SA 516 G70, Dia for 7.5 cu.mt tank is 1500mm,

Receiver manufacturer has taken design pressure as 11 Kg/sq cm and Hydrostatic test pressure as 16.5Kg/sq cm. Shell and dished end thickness are taken 10mm. Is that acceptable?

Regards

Bala

As per your data, 1500mm dia. and 7.5m³ volume the length of the tank is approx. 4m

The required thickness considering 3mm corrosion allowance(which is very conservative for a Air reciever tank) is 8.92 for shell and dishends.

As far as the hydrostatic pressure is concerned, for the above results according to UG99(b)(1.3*MAWP) it is 16.9 kg/cm² and as per UG 99(c) (1.3*design pressure) it comes out to be 14.3 kg/cm².

So to conclude I should say that the Design is correct, and there is no problem with the provided design pressure, hydrostatic pressure, thickness of shell and dishend.

I hope I have understood and cleared your query.

Dear Mr. Nitin

7.5 cu.meter capacity is for dry air and 4.0 cu.mtr is for wet air ( i.e before air dryer) vendor has considered both as dry air and took corrosion allowance as 1.5, please give your comment for this.

regards

bala

09779451304

The corrosion allowance taken is Ok as, 1.5mm is considered for normal services, Don't worry about the thickness it is sufficient.

Dear Mr. Nitin,

Thanks & Regards

Balakrishnan.V