Hi all,

This is my firts time working with API Tank nozzles.Please share me any information regarding the mandatory analysis of pipe sizes at specified temperature.

The pipe is only 10” with a design temp. of 150 deg. F. Does anybody know from code or standard practice that this particular size and temp. be included in the analysis? We are required to send all loads we have right now to the vendor for approval but somehow I need to know if it is a mandatory requirment to qualify certain pipe size on certain temperature range on API 650 tank. I am reading part of API 650 11th edition related to nozzle load on Appendix P but I can’t find anything related to this specific criteria. All I knew is that normally Vendors/Tank manufacturers’ requires designers to connect piping to their nozzles per code allowable.

Really appreciate all your help and tips on this issue.

There is no such hard & fast rule for the criterion. It depends on your client requirement or project specification.

By the way , what is the tank dia, height & sp. gravity of the fluid inside it? Is tank settlement critical ?

If you ask me, then this line shouldn't be stress analysed because 10" , 65 deg C makes no sense to analyse on computer provided there is no tank settlement . Just ensure that the supporting is proper & its flexible enough. Give it a visual check & let its soul Rest in Peace..!!

:-0)

Hi SJ,

Thanks a lot for being there and yes there is 2" settlement and the design temperature is only 150 deg F. or about 66 deg C. The specific gravity is 0.75 The other branch line to the tank is 12". I might run this one with settlement since it is more stiffer than the 8".

SJ,

I forgot, the tnak diameter is 160 ft.

Then in this case Eddie , you need to perform computer analysis...

because the settlement is significant ...

Also , consider tank bulging since the fluid is heavy & tank dia is large(if you're using Caesar II versions 5.2 & lower; its not considered in nozzle load evaluation for API 650 albeit the same is considered in v 5.3).

Eddie,

You may also like to look at hydrobulging of storage tank .