Hai all,
I have a project discussion on piping arrangement of a Tank...
Details of piping arrangement.
• Tank nozzle size is 36” and tank dia is less than 100 ft.
• Temp 200 deg F. 1800 kpa pressure on it.
•


• The 36” nozzle line is straight connect with a vessel in line with a valve the total length of this segment is 3 m.

Problems:

• The geotechnical report said the estimated settlement of the tank is max 78 mm, so due to the settlement of the tank the piping and nozzle also affected for this arrangement.
• But as in agreement expansion joint (if required) and location changing of vessels and tanks also not applicable....

Plz write any solution of this case......

Attach your file please to see

Dear Mr.javian,

Thanks for ur kind response.

I here by attached that view, plz go through it...

Thanks in advance

Regards

The only solution that I see is to rotate V-221A at 90 degree and to try another layout. Not only the settlement but also the 200F is an issue.

You can also try to take some advantage from the nozzles flexibility, but I guess it will be not enough.

I have no comment on the process even I don't know what they are trying to do.

StressSAI,
You did not say if this work is all new or revamp, so I am going to assume that it is all new. Under that assumption I would make both vessel foundations and PS-034 on a common Pad (spread footing). This would eliminate the problem of differential settlement. Talk to the Structural Department and find out what the status is of their work relative to these foundations.

Other comments:
- PS-059 - With the common Pad foundation design you do not need (or want) PS059.
- PS-059 - This is unnecessary and could cause a great deal of damage if you keep your current foundation plan

Besides the peers comments,I believe all settlement loads will be reduced by considering nozzle flexibility other than bending moment of thermal expansion.
I suggest you to ask client for using 2 victaulic couplings if it is possible.
And trust Steel!

36" pipe is very stiff. Even though you change the arrangement and pipe layout you will not be able to satisfy the nozzle, expansion and settlement requirements easily.

My suggestion is to put the tank and the column in a combined concrete foundation which allows the tanks and column settle together with no differantial sttlement. For the thermal expansion you may need to involve in selection of an expansion joint or pipe sleeve. In case the two vessels are close enough you may not need to put anything like that at all by watching the tank wall deformation/loading under all actions.

Hope it helpd

Ibrahim Demir

In addition you should obtain reduced realistic values for temperature and pressure.

1800kPa@93C is taken probably from the Piping class (Piping material specification) and inserted in the Line List Design Pressure and Design Temperature columns.

200F is a value specified in API 650 (para. 1.1.1) and 1800kPa is the value of maximum pressure for a 150# flange at 200F.

Doesn't mean that your system will ever "see" these values.

The problem is that in many companies these values from line list are "untouchable".

In many (?) cases is not a problem but sometimes it is.

Regards,

StressSAI , while waiting for some kind of feed-back from you I took another look at your drawing.
I have the following comments about the 36" connector pipe between the two vessels:
1). Unless that pipe is put in place before V-221 is installed I doubt you will be able to install the pipe.

2). To swing either of the Spec-Blinds (each end of this line) you must be able to spread the flanges, remove the gaskets, swing the Blind and install new gaskets (on each side of the blind). How are you going to do that?

Stress SAI,
How about letting us know how this ended up?

So StressSAI,
What was the final solution to your problem?
Would you like to share with us?