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  1. edanyel

    Guy Wires tension

    Paddintongreen, please accept my apologies I didn't intend to be offensive, sorry if I did. I'll read carefully this appendice you linked. JStephen your point is clear, thanks. The rest of you thanks, you've all been helpful
  2. edanyel

    Guy Wires tension

    It's an existing flare stack, ten meter long over a forty meter high roof. The four 35 mm diameter and ten meter long guy wires have been there for almost thirty years. I bought like for like replacement wires. I know the nominal tension for the new ones, but the question is...shall I tension...
  3. edanyel

    Guy Wires tension

    I don't know if this is the correct forum. My question is: Does anybody know if there is some international Standard stablishing the correct tension for a guy wire? I'm talking of a flare stack supported by for guy wires for stability. I'm looking for something like "...10% of the nominal...
  4. edanyel

    how to put a PSV in service

    Hi you there! You have all been very helpfulll. I apreciatte your responses. Keep it going! Thank you![thumbsup] Daniel
  5. edanyel

    how to put a PSV in service

    In this case, Option b - Switching from PSVa to PSVb while the tank is in service, but the situation shouldn't make any difference. I think the correct way is -in any case- Open BVb2 first, then BVb1. Am I wrong? My reason is -for safety-, you first have your PSVb discharge open, then the...
  6. edanyel

    how to put a PSV in service

    I don't know, maybe it's a silly question but... Please, look at the picture, if I have to put the PSVb in service, which will be the correct sequence? Open BVb1 first, then BVb2 ? Open BVb2 first, then BVb1 ? It doesn't matter which one first ? For any answer please, could you give me your...
  7. edanyel

    change over valve

    Donf, JimCasey: Thanks a lot. You both been very helpfull. Bye
  8. edanyel

    change over valve

    JimCasey: You are right, is definitively a very old valve, but it is a lubricated one. Actually what I was looking for were some details of the sealant (lubricating) compound for that valve and the correct lubricating procedure. I've found the complete name, is Rockwell Merex, and it is from the...
  9. edanyel

    change over valve

    Hi guys, where I work, I found a manual selector valve under a pair of PSVs, and it's not working properly. The brand seems to be MEREX or something like that. I'm attaching a picture. I can't find information about it. Does any of you have heard about this brand, any web page, some technical...
  10. edanyel

    Proving a relief valve is not neccessary

    Every PSV must have been designed for an specific and WORST CREDIBLE SCENARIO. If you just establish there's no way of achieve that risk condition then you don´t need a relief device. Be aware, sometimes the scenario is external fire then no matter process coditions, you need a PSV. Hope it...
  11. edanyel

    Translation from English to Spanish

    JSSeaagull: This is for Argentina Ggordil: I agree. I haven't asked any one but you yet. [glasses]
  12. edanyel

    Translation from English to Spanish

    Hi guys: I found in a form I've got to fill in, the following word (phrase): WETTED ELASTOMER. refering to a material description of a PSV. If among you there is a Spanish language guy, I would like to ask what the translation would be: ELASTÓMERO MOJADO?, HÚMEDO?, BLANDO? Is in this case...
  13. edanyel

    Rupture disk-can it burst from the other side?

    Rob, What I mean is that I would think of discharging my RD into another place. Just don´t think about if it breaks from the back. You must see the situation as if you were establishing a potential overpressure scenario because of the header pressure in the discharge side of the disc. Do you see...
  14. edanyel

    Rupture disk-can it burst from the other side?

    Rob5377, the only silly question is the one that is not asked. I agree with everybody. The only thing I would like to ask is, did you say ¿¿40 bar?? Rgds Daniel
  15. edanyel

    Pressure Relief Devices

    Robsalv, at our plant, we take the outside conditions of the prv as part of the issues to be taken in account when determining the next interval. For example, let's say very good results in test stand lead us to a 5 year interval, but corrotion in bolts and nuts may put us in trouble within...
  16. edanyel

    Challenging the common Bellows wisdom.

    My answer is then: My question is, how is this function impacted if the bellows is "holed"? Your balanced PRV is not balanced any more. [B] Or alternatively, how will a conventional PRV operate with a failed bellows? [B] It'll pop at higher pressure, how much higher depends on the BP...
  17. edanyel

    How to know if a PSV has opened?

    Robsalv my question wasn't tricky I've been really asked about that matter and my answer was no, I have no way of telling if the valve did open or not. Thanks for your comments. I'll give you my silly guess about yours....was it partially open all the time? Rgds Daniel
  18. edanyel

    RV Test Room Condition

    Thoughts: Temperature: ideal: 20° C to feel comfortable while testing. Pressure: 1 Atm. clean room: if not, you better change your contractor. (if you are the contractor, change your employees) References: common sense. I'don't think any special conditions are needed, a test stand it's...
  19. edanyel

    Pressure Relief Devices

    My client needs the Pressure relief devices to be visually inspected (in-service) every year. Our Onstream inspection program is every two years which cover pressure relief devices as well. My opinion is that none of the international codes, API, ASME, NBIC, say nothing about visual inspection...
  20. edanyel

    Challenging the common Bellows wisdom.

    Mine is far away from being an answer, it's just a thought. A flare is an open vent isn't it? at it's end point your waste is burning to the atmosphere. But anyway you always have your header pressure present. What I mean is that a new little open vent (the hole in the bonnet)won't make a...

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