Hi Guys,

Can anyone tell me about the M-factor which is calculated during the thickness calculation of a torispherical head.

How does it going to affect the strength of the vessel if the value is greater than 1.77.

Below is the note and a warning that I am getting in PVElite because of the above mentioned reason.

I have used ICR=3100mm and IKR=76mm in this calculation.

Warning: M is > 1.77. Check L,r, and the Dimension Basis
carefully. L and r should be on Inside Diameter basis.

Note: r is less than 6% of the head skirt OD.
Please check UG-32(j) and UG-81 for Code compliance.

I did check the UG-32(j) and UG-81 for Code compliance. I wanted to know can we use that values of ICR and IKR for a non coaded tanks. and if we use it, how is it going to effect any factors (like stress, thickness, strain etc).

Thank You Guys,
Chandanraj basavaraju,
Design Engineer

Please read Appendix 1 of ASME VIII-1.
Cheers,
gr2vessels