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Hi everyone, I'm looking for some advice and direction on where to start with regards to understanding and design of steel plate & shell structures and welded/bolted connections. I don't want to bore the reader, but here is some backstory... My original training was as a Draftperson and...

Can A36 plate be used for a storage tank when MDMT is stated as -20F or is additional testing of material required. What is the MDMT of A36 Plate? Thank you

If calculations show that no anchorage is required for Net uplift, seismic and wind loading do they still net to be installed to resist internal uplift at the calculated failure pressure? Thank you Vance

The API 12F specification references skirted and non-skirted cone bottom tanks. My interest is in the skirted style, but the specification does not provide information on how to design this the components of this assembly. I have a tank design program at work which includes cone bottom design...

I have a drawing in AutoCAD 2004 where the text and notes are not displayed in the viewport, but are visible in model space. This is odd as there are other viewports on the same page that display just fine. I have checked the attributes of the viewport and also the layers to see if anything is...

When we get into the 2500# ANSI stuff I'm having a couple problems figuring out the max test pressures on the 2500# Flanges. What we're looking at is an customer spec flange (ASME 2500 RTJ, ASTM A 350 LF2 CL-1, ASME B 16.36). Now in all technicality we classify it as a Z662 flange, but our...

Does anyone have an Excel sheet or know of similar resources that could assist in calculating nozzle loads for API 650 tanks? Thanks in advance.

What texts would be benefitial companions to API 650 and API 620? I have been looking at "Design of Plate and Shell Structures (Maan H. Jawad)" and "Structural Analysis and Design of Process Equipment, 2nd Edition (Maan H. Jawad)". If anyone has any opinions or recommendations for other books...

Does the spacing of anchor chairs on the tank circumference always need to be equal? I have a situation where I would like to increase the distance between two chairs. Even with the change the total distance between all anchor chairs is still less than 10' on the circumference of the tank as...

API 12F shows a diagram for support of a skirted cone botton, but does not go into detail regarding how to size the support rings. I also have a tank design program at work which will give design thickesses for a cone bottom based upon cone slope, size of tank and internal pressures. This...

Please see the following information below that was forwarded to my by a co-worker. Any suggestions would be greatly appreciated. Thanks in Advance ----------------------------------------------------------- Given the following information Design to ASME B31.3, 2004 Edition After running...

Can the details shown in Appendix 'F' Figure F-2 (specifically Detail 'A') be used as alternate roof to shell/angle connections to the roof to shell joints shown in Section 3, Figure 3-3A 'Typical Roof and Bottom Joints'? Thank you in advance.

Can anchor chairs be prefabricated on a repad and then installed on a shell of the storage tank?

When the participating area at the roof to shell junction (without compression ring) is greater than then required participating area as per API 650, does this mean that the roof to shell compression ring may be omitted? (REF API 650 Edition 10, Addendum #4 Section 3.1.5.9 (e) and Section...

API 650 Appendix states that for tanks 12'-0" or less in diameter a maximum pressure of 5 psi shall be used. Can a lower test pressure be used for this size of tank, between 2 psi and 3 psi for example?

Is there a formula for calulating the air flow (standard cubic feet per hour) for a tank vent opening given the diameter of the connection and the internal pressure of the tank?

I have a situation where a 24" x 36" rectangular manway has been specified in a 1500 BBL (21'-6" diameter x 24'-0 high) storage tank. How do I determine the proper size of reinforcing pad for this opening? API 650 forcuses mainly on round shell openings. Thank you

I have received a bid from an engineering company which is asking for a API 650 tank. This is not a problem, except for the fact that they are asking for some nozzles to be 'frangible'. Has anyone ever heard of this coming up before, and if so where do I look to find design information for...

I am looking for some example calculations to use as a reference for anchor chair design for tanks (17-24 foot diameter)with small internal pressures (8 oz/psi to 16 oz/psi) built to API 650. An excel sheet would be wonderful, but I may be pushing my luck looking for something like that. Any...

As the use of gas blanketing systems increases I am receiving more inquiries for higher operating pressures for shop fabricated storage tanks. The most common sizes are 750 BBL (15'-6" diameter, 1000 BBL (17'-3" diameter) and 2000 BBL (23'-6" diameter) tanks to be supplied with...