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Recent content by Danlap

  1. Danlap

    Gland becomes brittle and porous in High Pressure NH3 service

    Seems like you already negating that something wrong with (pure?) graphite and Inconel wire against Ammonia. For us to better understand the issue, suggest to elaborate the story more. PS: Graphite (alone) and Inconel are relatively inert against most medium; plus graphite by default is already...
  2. Danlap

    Low cost butterfly valves without the rubber lining

    I vouch for GBTorpenhow over 'seat-in-body'. Man, that's really old design and challenging to installed. DeZurik, that is one brand that I never forget since 20 years ago. You've touch three different topics: - Seat in body (what you've currently installed) vs EPDM rubber line --> both are...
  3. Danlap

    Pinhole above bonnet - HF service

    Thanks for reply Krausen, quite eye opening. No we don't have material spec aside from what is prescribe/approved by UOP (Phillips??). Have to say bluntly following approved types, material (carbon steel and Monel only??) and manufacturers by adding extra assurance such as 100% X-ray, no welding...
  4. Danlap

    Pinhole above bonnet - HF service

    Good day, I was wondering if someone have similar experience with pinhole and maybe have done some root cause analysis. Subject is Monel globe valve for HF service. Fully aware that Monel valves have common challenges such as casting shrinkage or micro porosity which later susceptible to be...
  5. Danlap

    Seat Rings of small and big size ball valves

    Like its name, it is special. I don't have the courtesy to own/share the drawing. Would requires some ingenuity and simply logic to think about it, I believe you can. Give an example and hint: below from left to right: ball - adjusting bush (red arrow) - seat holder (blue arrow). Name can...
  6. Danlap

    Seat Rings of small and big size ball valves

    Hallo, Design philosophy of ball valve is that either ball or seat will worn out overtime (after dozens if not hundreds cycles), then it would be logical if seat(s) should be the one that can be 'easily' repaired or replaced. Smaller size and weight shall compared to ball. Thus, fully welded...
  7. Danlap

    PSV checking

    hi, There is a Safety Relief Valve Engineering (PSV) on a different channel. IMO best suited there. In a nutshell. Step 1 Operation/Process Engineer end user side provides: Medium, Pressure (upstream and downstream/back pressure), sizes, Design pressure of 'protected' upstream equipment, etc...
  8. Danlap

    fugitive émission and hydcrocarbon fluid

    Yes/Yes API 624 title is 'Type Testing for Rising Stem Valves Equipped with Graphite Packing for Fugitive Emissions' whilst API 641 title 'Type Testing of Quarter-turn valves for Fugitive Emissions'. It's quite self explanatory. Gate is rising stem and ball is quarter turn. Rising stem valve's...
  9. Danlap

    fugitive émission and hydcrocarbon fluid

    Hello, If the company bound to clean gas act or Brussels Accord or similar (on other parts of the World), then Yes, it should be specified. Control valve would be a tricky one though Please connect below dots to support the narration: Leakage path from valve can be from: gland packing...
  10. Danlap

    API Valve Trim Type & NACE reqs (Gates, Globes, Checks)

    Hello, Your questions are quite complex since it covers multiple aspects. Lets use some baselines: a. Non-NACE trim (spindle, obturator and seats) might subject for hydrogen embrittlement shall exposed to extended period of time with wet H2S for example: if spindle of gate valve broken at...
  11. Danlap

    which valve is it

    Hi, Looks like a split body ball valve.. Gearbox suggested it is quarter turn (12 o'clock tag seems O for Open and 9 o'clock tag seems Close marking). Quarter turn usually ball valve, butterfly valve and Plug valve. Guessing it was pre 1980's. Not sure if this is ANSI class or WOG. Won't be...
  12. Danlap

    Pressure Control Valve vs Flow Control Valve

    LittleInch already explain very thoroughly. Do you have like engineering group or something within your company to discuss this thing, assuming you're working for valve manufacturing company. Discharge is basically downstream side of the valve, and suction is upstream side of the valve. So flow...
  13. Danlap

    Sizing software developers

    Good day, I don't know any USA based, but that shouldn't be a problem wrt nowadays communication. Try CONVAL, German based with worldwide clients. Of course there are many others. IMHO, valve sizing (software) companies should have hundreds or thousands valves database from different...
  14. Danlap

    Fire Safe test for Butterfly valves

    Hi, I see that this post is redundant and might confuse someone. I’ve provided answer on similar post. If end user requires fire test, then manufacturer shall comply with it. API 607 with title 'Fire test for Quarter Turn valves and Valves equipped with Nonmetallic seats' specifically made to...
  15. Danlap

    FIRE SAFE TEST FOR BUTTERFLY VALVE AS PER API 607

    Hello, your question: The supplier says Butterfly valves with EPDM seats don't require a fire-safe test certificate. Is that true.? Short answer: This is not entirely correct. Longer explanation: Fire test standards which covers elastomeric materials are: ISO 10497, BS 6755-2, API 607 or API...
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