Dear all,
how to calculate nozzle load in vessel? which standard is to follow?as per client philosophy they mention,
Fa=Fl=Fc= K*1250*D (N)
Mt=K*125*d*d Nm
Ml=K*100*d*d Nm
Mc=K*75*d*d NM (for Cs Matl)
Mc=K*50*d*d NM (for SS Matl)
where K= pressure rating of vessel
K= 1.00 for 150# and 300#
K= 1.25 for 600#
K= 1.50 for 900#
K= 1.80 for 1500#
K= 2.00 for 2500#
a= Axial Dir, t= torsional, l= longitudinal, c= circumferential Dir, D= nozzle nominal diameter in inches
Form above fromula where it derived from which code says.

Shabeer,

Generally nozzle loads are specified by client either in tabular form or in terms of formulae. One needs to follow the same.

Exact values are derived from piping stress analysis or from the loadings exerted by equipment/other vessel attached to that nozzle.

Thanks.

Mukesh
+91-9428500192

In addition to Mukesh, I will point out that, In PV Elite,

1. If you performed actual pipe stress analysis using COADE's CAESAR II software then you can import the nozzle loads in PV Elite (using the appropriate icon and the global convention system, refer to the help).

2. If you have the standard piping loads you can specify them in a Excel file and link that to PV Elite, so these loads can be applied to any particular nozzle based on its size and the rating of the attached flange. For this option, click on Excel icon in the nozzle loads dialog.

PV Elite includes std. nozzle loads from AS1210 code (Australian pressure vessel codes) and a fabricators data. Other companies have different standards.

Thanks mandeep singh and Mukesh,

While doing analysis using PV elite, one should enter max allowable nozzle loads, generally for each size nozzle loads shall be given by Client in their specification, if not it shall be taken from the PD-5500 Appendix-G.
OK.

Hi,
nozzle allowable loads r generally related to the size of nozzle. these loads r generally given in the Project specifications, which r applicable to both piping & static engineering. both should have to limit these loads with respect to the stresses in vessel & nozzle wall. these loads r generally given in 3 directions, but it does not mean that it will act in these directions only.

This question is for Mr. Singh but anyone is welcome:

Mr. Singh,

Most Vendor would give us nozzle allowable (ASME Sec. VIII Div. 1 for example) in Forces and Moment and I used to hear even in this forum that this numbers are coming from the mention code say particularly UG-40. I noticed too that between engineering companies, these numbers varies a bit but vary a bit high between some Oil company and engineering company here in the USA and at some point the allowable from our project (Client requirement) overseas is about as high as 3x. All are based on 150# flange rating and based shell side of vessel and a design temperature up to 500 deg. F. So my question is, is there any sort of standard equation that these numbers are derived? And if there are where are they referenced from? I can't find nothing on ASME Sec. VIII, Div. 1.

Thank you very much for any enlightment.
EddieB