Just a question because I know it is coming, What is API's stance on using an AL-6XN or 254 SMO material on a tank. I know Duplex is now widely accepted in harsh environments. If these materials are requested can the parameters in Annex X be used with them? Or will it just be per good...
Similar to a post below about the large man way, I have a client asking us to bid a tank with an extremely large flush clean out. It is to be 60"x72" to be exact. Now API 650 5.7.7.2 it clearly states that the maximum height for a flush clean out is 48" for Group I thru IIIA, and 36" for...
Need some help on tolerances for the bolting flange on a LWN flange. I cannot find anything in B16.5 that corresponds directly with this. Just for back ground the nozzles had to overlayed with an alloy and during the overlay the flanges warped some due to the heat input. The sealing surface...
Per API 650 5.2.1f the Minimum Roof Live Load on the horizontal projected area of the roof is to be 20lb/ft^2, or may be determined by ASCE 7 , but shall not be less than 15lb/ft^2.
My question is can this load be reduced to 0 lb/ft^2 at the owner's request and the tank still be considered an...
There is a discussion in the office here on the requirements of the annular when A516-70 material is used for the shell and bottom for a tank. In API 650 section 5.5 the code says that if the material is designed using the allowable stress for materials from groups IV, IVA, V, or VI, then a...
I am working on a tank that was originally built in 1982 to API650 6th Edition 3rd Revision. The wind girder is to be replaced 100%. I need to know the wind speed the tank was originally built to per API. Does anyone know what the wind speed in mph was in 1982 for tanks?
When I do the...
I am working on replacing an existing tank with a 2" drain coming out of the bottom of the tank. In looking at Appendix O the only nozzle sizes it list are 6" up to 48". Is there not any requirements on how far away from the shell the nozzle center is for smaller nozzles? And for does the re...
I have a question about the impact testing per ASME Section VIII Div 2 section 3.11.4. of SA-240 304L material for a vessel with a design MDMT of 20F.
The way I understand it is that the material is impact tested or the production impacts of Category A and B joint are tested. I do not see any...
If a rough forging is purchased for a LWN type flange on a PV is it to be designed to App 2 or can it be calculated as a custom forging with standard dimensions. Example. For a 18" Type F flange.
If an ASME vessel is going to be re-rated as an API 620 tank, can the ASME calculations be used to verify the thickness and stability of the tank? Or does a new set of API 620 calculations for the tank need to be performed? Any opions and why.
Just for information a client has two ASME...
The tank is an API 620 tank with 3psi IP and 2" WC for EP. Is there a reference to calculate the roof partial vacuum load that is applied to the shell in lb/ft for a foundation design. This is the first time to do this type of calculation. Any help is appreciated.
I do not know if this is the right place to put this, but here goes. I am looking for any suggestions on books for welded steel silo design. I have Tubular Steel Structures by Troitsky from the Lincoln Foundation. Are there any books that may be better for this type of design?
Does anybody know of a reference for designing the crow's nest for a supported cone roof? If so I would like to know so I can get it to review. Thanks in advance.
Just in case and to clarify I am talking about the support structure on top of the center column.
Is there any way to create page breaks in the calculations when printing? This would be nice to keep tables on one page and also to separate some of the calculations that are combined. Thanks in advance.
I need some clarification help on wafer check valves.
I speced some short pattern wafer check valves for a job and the purchasing agent bought regular wafer check valves and when they realized those were wrong they bought a wafer style swing check valve and now I am getting questioned because I...
I am having a problem with the new COMPRESS 6300 update increasing the thickness of vessels when a liquid level is added. For example I have a 5/8" thick vessel that 50' tan to tan and it increased the top head to 7" and the straight flange on the head to 18" and the top shell course to 4" when...
I am working on a repair for a Sec. VIII Div 1 vessel and the client wants to go back to the original code. The vessel was stamped in 1981. I have been using COMPRESS to do our vessel design, but it only goes back to the 1995 edition of the code. Are there any major differences between this...
