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  1. DGrayPPD

    piping

    As LI stated, this is a pretty common topic which you can find plenty of info about with a Google search. But, it would also be a little more helpful to get a few more details about what you are looking for and what your conditions are. What's your pipe transporting? What phase is it in...
  2. DGrayPPD

    Pressure gauge install on pumps

    You can check out API RP 686 "Machinery Installation and Installation Design". The following is from Chapter 6 which covers piping. There's also figures that show typical locations of such items. 2.6 Pressure Connections and Thermowells 2.6.1 Pressure measurement connections complete with...
  3. DGrayPPD

    are there any problem in the PSV design

    navycaptain, Although I'm not saying that this should not be a concern, I can't say I've ever heard of it being one before when welding two fittings together. If you have a beveled LR 90 and a beveled WN flange, then you should be able to weld them together same as you would a beveled LR 90...
  4. DGrayPPD

    are there any problem in the PSV design

    Hi navycaptain, I understand what you're meaning about welding a pup piece of pipe in between the elbow and the flange. My question to you is, why do you think that this is necessary? What benefit do you think it gives to have a pup piece of pipe between the elbow and the PSV outlet flange...
  5. DGrayPPD

    MTO confusion

    I agree that my first thought would be that it is part of the supplementary requirements in the ASTM standard. I'd check those first. A333 S1 talks about subsize impact specimens and and as chrysa1975 stated, A671 talks about tension and bend tests. "Those who know, do. Those that...
  6. DGrayPPD

    are there any problem in the PSV design

    A picture of the whole inlet/outlet piping might be a little more helpful to advise on. I agree with the above comments about the inlet pipe size and the lack of isolation valves (from what I can see in the picture), but I don't have any issue with the elbow welded directly to the outlet...
  7. DGrayPPD

    DSAW PIPE DETAIL -

    "The only limits in life are those which we impose upon ourselves."
  8. DGrayPPD

    Flange to Flange joint

    ^^^ What they said... [pipe] "The only limits in life are those which we impose upon ourselves."
  9. DGrayPPD

    ASTM A 53 Gr B / API 5L Gr B - Carbon steel or Mild Steel?

    I've seen varying ranges, but what I've see most often falls in line with mrfailure. Low Carbon Steel - less than 0.20% Carbon (although I've seen this number be 0.15% as well, as mrfailure stated) Mild Steel - 0.20%-0.50% Carbon High Carbon Steel - over 0.50% Carbon As far as why ASTM doesn't...
  10. DGrayPPD

    Do Your Manager Bypass Engineers and Go To Drafters Directly to Make Designs/Drawings?

    Well, it can happen in a company of any size. But I would think it probably has a little more prevalence in smaller companies, yeah. Larger companies, especially public, don't have a choice but to have the structure, organization, and internal controls in place in order to succeed for their...
  11. DGrayPPD

    Do Your Manager Bypass Engineers and Go To Drafters Directly to Make Designs/Drawings?

    ThinCap, I feel your pain. This has been a common problem in my organization as well. But that does not mean that it is normal nor should it be. I am (supposed to be) responsible for managing the workflow and backlog for the piping and drafting teams in my organization. I have been...
  12. DGrayPPD

    Flange to wall clearance

    You can do a Google search for this and find some references to go by, like what is shown below. "The only limits in life are those which we impose upon ourselves."
  13. DGrayPPD

    Minimum Thk for butt weld

    ARUN SIVAN, I'm not sure where you are from, but perhaps you should get a copy of ASME B16.25 "Buttwelding Ends". It would probably help you answer some of your questions. See below for a short excerpt. "The only limits in life are those which we impose upon ourselves."
  14. DGrayPPD

    Welding Different NPS Together W/O Reducer

    Got it all squared away. Just a miscommunication. The fabricator/procurer who wanted to eliminate the swages actually did want to replace them with type 1 inserts, but the PM (non piper) who relayed the message to me didn't know what he was talking about so he just said to delete the swages...
  15. DGrayPPD

    Welding Different NPS Together W/O Reducer

    Thank you both for the responses. I'm trying to get clarification as to what the reasoning is. If the reasoning is simply to keep all the 3/4" valves consistent as MSX x FSW (there are others in the project that have these same end conditions), then I would still suggest at least adding a...
  16. DGrayPPD

    Welding Different NPS Together W/O Reducer

    Good morning everyone, I have a quick question regarding the image below. The line below is part of a glycol-water system, 304 SS material. The silver piping is 1" NPS SW and the magenta valves are 3/4" NPS SW. Operating conditions are 44 psig and 25 deg. F. The valve on the left side will...
  17. DGrayPPD

    Ordering reducing TEES across multiple schedules

    XL83NL, You're right. But the client's don't always seem to know that these days, so we've gotten to where we always still specify the weld seam with the callout. It's just a habit for me at this point. We've actually just recently changed from A234 WPB-S to A234 WPB SMLS [wink] "The only...
  18. DGrayPPD

    Ordering reducing TEES across multiple schedules

    I've worked on both sides (the fab shop and the engineering firm) and I've seen it multiple ways. The most common approach I see is to match the specs. So if the spec shows 4" STD and 2" XS, then the reducing tee would be called out with dual schedules. The reducing fittings should always be...
  19. DGrayPPD

    Threaded joints & fitting unions use in gas process plants

    I can't exactly your answer your question from an industry perspective. I can say that I agree with your viewpoint, but I have seen many instances where the client specs all state threaded fittings in the small bore piping, even with hydrocarbon services. Some will at least say they're going...
  20. DGrayPPD

    Top & Side Stab of New Branch Connection

    From a piping design standpoint, generally all new tie-ins are made into the top of the pipe. This is to aid in constructability, as well as to allow for future expansion. Tying in from the side could potentially eliminate any chance for future expansion, as you've essentially blocked off the...

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