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  1. roca

    Does design of lifting lug have some standard practice?

    r6155 and balamurugan02 Thanks for your comments. Never seen it done before for a vertical vessel either in pieces (as suggested by balamurugan02) or as a complete finished column, and I doubt I ever will. Cheers
  2. roca

    Does design of lifting lug have some standard practice?

    MJCronin For the equipment I am asking about (a fabricated large column - which the guys above say can or are required to be load tested) - None as far as I am aware and have used in past designs
  3. roca

    Does design of lifting lug have some standard practice?

    balamurugan02 Please read my post and tell me how trunnions/lifting lugs are tested on a column with the example dimensions/weight I showed in my post. I am fully aware of skids with structural bases being load tested as these skids can be bolted down to the shop floor in some way or loaded up...
  4. roca

    Does design of lifting lug have some standard practice?

    r6155: Where in ASME BTH-1 or even in ASME B30.20 does it mention the design of pressure vessel lifting lugs or trunnions? I cannot find this. Also - please let me know how you load test lifting lugs and trunnions, say for example a 40m long column (130feet) weighing say 100Ton. It is not...
  5. roca

    Does design of lifting lug have some standard practice?

    Why not use trunnions? My previous response to a similar question: IMO working with an experienced good engineer who has done this type of work time and time again in the past without issues is my recommendation. Books and theorey are all good but books do not cover all the things you may come...
  6. roca

    ASME B16.5 Flange Ratings

    Thanks XL83NL I actually found the historical details document posted by LittleInch myself via a google search. The history doesn't actually say what was done/changed in the ANSI standard, but obviously the published ratings in the 1973 version were incorrect. Like I said above I seem to have a...
  7. roca

    ASME B16.5 Flange Ratings

    Hi All I have also posted this under the ANSI Eng Tips forum - but it is applicable to ANSI and ASME I found this post: https://www.eng-tips.com/viewthread.cfm?qid=181686... in my search to a problem I am currently looking at. My question is was there an error in the 1973 ANSI B16.5 150#...
  8. roca

    36"NB - 1500# rated Weld neck Flange

    Thanks LittleInch - will take a look
  9. roca

    36"NB - 1500# rated Weld neck Flange

    Is this size of flange and rating available in any ASME (or API) standard? ASME B16.47 does not cover 1500# rated flanges. Thanks
  10. roca

    Fireproofing on supports only

    Vertical vessel skirts and horizontal saddles are fireproofed so that in the case of a fire the vessels do not collapse, rupture and add more fuel to the fire (escalation). I have seen vessels offshore fully fireproofed and not just the supports. These were fireproofed with Chartek and it was...
  11. roca

    Selection of flange facing

    ...and the project or Client piping/valve class specs and datasheets. These (should) provide all details and required flange facings. Normally 900# and above are RTJ, less than 900# = RF. This can differ though from Cient to Client.
  12. roca

    AIR GAP INSULATION

    Thanks All
  13. roca

    Manaway Davit Arm Made From Pipe

    A vendor of ours is purpose designing some manway davit arms from SA106 Gr.B pipe. I requested that the -12.5% undertolerance be applied to the pipe - unless of course they do thickness checks to confirm actual pipe thickness. The davit is for a 24"NB-600# + 5mm Weld Overlay blind flange (circa...
  14. roca

    AIR GAP INSULATION

    Thanks Mike This is not a pressure item and has nothing to do with ASME VIII. It is basically a thin sheet cover around the vessels allowing a 50mm air gap between the outside of the shell and the inside of the 0.9mm thick sheeting. Sorry if my post was not clear. The only loads the sheeting...
  15. roca

    AIR GAP INSULATION

    Hi All I am working on a gas plant upgrade project and there is a requirement to apply "air-gap insulation" to vertical and horizontal pressure vessels. The air gap insulation is basically a 50mm air gap on the outside of the vessel shell/ends and a stainless steel sheeting is then applied...
  16. roca

    TEMA TYPE VMU

    Hi mechanical2014 Thanks for the reply I would have called it a hairpin heat exchanger - of which there are two types: 1. Double pipe section with one tube (which can be finned or bare) within each shell/pipe 2. Multi-tube section with multiple smaller tubes (either finned or bare) within each...
  17. roca

    TEMA TYPE VMU

    Thanks guys, attached is a picture of the beast. It was made by Brown-Fintube in 2004 who specified “VMU” on their datasheet – maybe it’s their own in-house designation. Brief Details of the exchanger: Horizontal Shellside = 24”NB, single pass. Tubeside = Fixed tubesheets and U-tube bundle...
  18. roca

    TEMA TYPE VMU

    What does the "V" stand for?
  19. roca

    RTJ Flange Bottom Groove Radius

    Thanks - trying to get more info on why it is asked for. Will be expensive too as these will need special machining to comply.
  20. roca

    Manway Tightening Prior to Shipping

    Vessels are always opened up at site - especially if they have internals which could have moved in transit, and even if they don't - the vessel might inadvertently had water or other unwanted matter ingress. This is nothing new. Only flanges that should be torqued up are those fitted with...

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