FIXED SUPPORT BEFORE EQUIPMENT CONN

Dear All,

my clint asked us to install the fixed support before every equipment connection, so i need to replace the sliding support.

please note the design parameters
Design Pre: 50 Barg
Design Temp: 50 deg C
Working Press: 40 barg
Working Temp : 8 - 38 Deg C
pipe Size: 24 Inch


the question is

1) what is the reason to install fixed support not with sliding support even the allowable nozzle loads are with in limits


2) fixed support mean a anchor? if not how to modell in caesar II? and what should be the friction value?


3)from above design and working conditions to which temperature i should do analysis?
T1 - 50 ?
T2 - 8 (inlet to the heater) and 38 (outlet from the heater)?


please advise


Thanks

Basker1982,
You wrote:"my clint asked us to install the fixed support before every equipment connection"

This seems like a very broad and rigid statement.
I recommend you or someone in your Company needs to request a written detailed clarification from your Client stating which equipment and the specific reason.

Please let us know what kind of answer you get.

'Fixed support' does usually mean 'anchor' however .....

You may be able to model an 'anchor' in Caesar II for a 24" line near a pump or whatever, but you will not be able to design one.

Consider the moment of inertia of a 24" pipe and think about how massive and ludicrously stiff a restraint and pipe attachment would have to be, in order to really be an anchor, and prevent all translations and rotations.

Like Jop says, time to get a clarification from your client.

Dear Jop and Moverz,

Thanks, i have asked clarification from our client and waiting for their reply meanwhile kinldy clarify to the belwo doubt.

the pipelines are connected to the static equipments (Pig Launcher, Heat Exchanger & filter) and operating @ 8 deg - 38 deg C but the design temperature is 50 deg C. kindly advise me on temperature selection is it operating or design?.

What does the difference represent ? Is it a real upset temp, max operating temp for instance ? Some companies add an arbitrary value (I've seen up to 30 degC) to any max op, to get a design figure.

I would advise you to discuss it with your Process Engineer. I have often had a Process Line List annotated ... "Temperature for stress analysis is ..." where an unrealistic design temp was involved.

The client makes your life easier. If he insists in placing anchor point in front of the equipments, you can stop your calculation at the anchor. And at the anchor will stop your responsibility. Whatever happens on the other side of the anchor will be client responsibility.

Nice, isn't it?

Providing anchor point before nozzle of a equipment in a "straight" run(without expansion joint) causes huge load on the nozzle of the equipment. This load do not related to length on straight pipe between the anchor and the nozzle. I think this installation is not practical.

i m agreed with NRAM

But, It's very common see pipe connected to a tank with a simple and straight run (without EJs). So, it sounds like a fixed support and a rotate equipment connected.

This kind of instalation need some attention due the high forces that is caused by thermal expansion. So, I think this situation is useful only in cases of low delta T (in this case, expansion can be neglected).