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Geoff13 - a lot of your question can be answered by boundary condition used in floating case: "When the roof is floating on the process fluid, the deck stays level with respect to the XY plane. Based on that, in order to bound the model in the Z direction, displacement of the deck. nodes are...

possibly perlite void is formed around that place. You can insert a camera thu perlite fill nozzle to verify. How long have this tank operated? If it is less than a year from construction, perlite void is a high possibility due to inadequate perlite vibration.

if you lifting point is above the CG, isn't pipe in tension?

bimr is correct. Steam pipe with pressure this low may qualify Cat D service to do initial service leak test in lieu of hydro with customer approval.

Agree with moltenmetal on size of PVC pipe. I would not use PVC over 4" because solvent cemented is less reliable exceeding 4" and HDPE and fusion connection should be used. What is support span of pipe? If not continuous supported, support span shall be calculated and in my experience, it is...

David - You may attract more replies if more information such as location can be provided. Gasket typically is not part of winterizing plan since the material shall be good for MDMT.

A lot of practical knowledge here. Thanks Duwe6 for posting this.

David- I am with you totally on the good of mathcad and the bad of prime. I was a Mathmatica user in university and I will have a look into how it is today.

Is sprayed PUF acceptable?

Jerry: You may look into excel shared workbook function. Save excel in a shared drive and several people can work and save at the same time. I am using a excel like that not for line list but for project time log. For user right control, you may need to use a procedure in VBA . I would think...

is this something college class homework?

You may use ASME B31.3 319.4.1 to rule out the stress analysis requirement. It may end up same as equation provided by pennpiper. But when someone has to approve your design, it may helpful behind a code.

Pipe is needed for prevention of soil dryness resulting from heating and water loss.Geotech engineer shall be able to tell max temperature bottom of foundation. Then you can tell if sand insulation is adequate. The pipes per your description feels like not for passive cooling.

Radially buried vent pipe with riser to remove heat by natural convection.

Thanks JStephen and IFRs. JStephen: Coating is taken care by 3rd party. I do not know much about it. I would specify the same if I do it. IFRs: You are right on AWWA quotation regarding pipe use. However, D-100 05 2.1.1 does not rule out using other pipe material. "Steel pipe shall conform to...

Pretty good size of pipe inside AWWA water tank serve to diffuse and minimize mixing. Size is 30" to 40". tank is 40ft and atm pressure. So max pressure pipe will see is hydraulic head by assuming no water hammer load. Water will diffuse at close to working level so pipe will be riser close to...

ione: Good doc. A star for you.

A little deviation from original post. I often encountered refinery steam line marked as 50 pound steam. General speaking, Does it mean gauge pressure(50psig) or absolute pressure(50psia)? Thanks. Yung

Any general practice in sizing drain piping is highly appreciated.

I am assigned to design a spill way for LNG tank. It is to drain LNG in case flange failure. While sizing the vertical drain piping, I was told to use self-venting design which limites froude # <0.3. My questions are: 1. If design for full flow(froude # =0.8), is it acceptable? what bad will...