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Recent content by mrtangent

  1. mrtangent

    Flame arrestors.. what standard determines if they are required.. ?

    All, i've recently come of a project in asia where we installed flame arrestors on tanks with atomspheric vents on materials with a flash point of 0-10 C. I'm fairly certain this was a local code requirement. I am now working on an older site and the tank vents of similar flash point dont have...
  2. mrtangent

    Vessel design SG of 1.5,

    All, we have a storage tank containing fluid of an SG of 0.7. We are installing a larger tank onto site. I'm told it works if we reduce the design margin on the codes from 1.5 to 1.2. I'd like some candit coments from engineers on your perspetive of this change. We dont process any fluids...
  3. mrtangent

    Steam Seperator : With flanged Drain:

    yes.. all drains are screwed fittings.. the inlets and outlets are flanged..but not drains..
  4. mrtangent

    Steam Seperator : With flanged Drain:

    Does anyone know of a steam seperator supplier that will allow a unit with a flanged drain? rather than a screwed fitting.. we want to use a unit for a liquid knock out but on a process service.. e.g. as a knock out drum.. but we need flanges for our 300 lb pipe spec on all connections,.,.
  5. mrtangent

    ASME Vessels v API Sizing Method:

    I found the following summary useful http://www.chemcad.co.uk/downloads/MNL036.pdf
  6. mrtangent

    ASME Vessels v API Sizing Method:

    a quick question for NPFA 30.. is the fire engulfment area formula different.. e.g. in APT 521 it is 25 feet and Q=F * Constant* A^0.82
  7. mrtangent

    ASME Vessels v API Sizing Method:

    Sorry for the confusion Don, API does have a method to size the capacity of valves. So does ASME.. 1. API 521 Gives a rating case 2. API 520 gives a valve capacity 3. ASME Sec XXX - Gives a capacity. Or rather some relief valve vendors only use 3 not 2.
  8. mrtangent

    ASME Vessels v API Sizing Method:

    Dear Conserned Relief experts: For various reasons we purchase ASME relief valve but we actually work in API on our site. I've no experience in ASME rating but our supply vendor uses ASME calculations. I am curious: For ASME: Does a rating document exsit - eg.g that gives you a basis for...
  9. mrtangent

    Inlet loss and combination factor for BD?

    On inlet loss calculations do you include the Bursting disc in the pressure drop before the valve...or do you down rate the valve capacity and exclude it..
  10. mrtangent

    Correct density to use in a steam generator level guage

    I believe as rates increase the density will drop of the liquid. Therefore unless i change the calibration density will be running the unit at higher rates (as we are now). I want to calculate the sg to input so we ensure the vessel is not overfilled. it is an existing unit so the manufacture...
  11. mrtangent

    Correct density to use in a steam generator level guage

    Dear sirs, I am struggling to understand how to calculate this. If you can recommend a reference please let me know. We have Steam generate generated at 100psig. The density of steam at 0.27 m3/kg(approx). but water at 100psig proir to boiling is 909 kg/m3 (approx). Does the rate of steam...
  12. mrtangent

    steam quality meter - success ???

    This is the link I have been sent. http://www.photon-control.com/products/OFM%20steam.pdf
  13. mrtangent

    steam quality meter - success ???

    Dear sirs, We are upgrading our steam seperators/demisters to prevent wet steam. A contact company has suggested installing steam quality meters...to measure wet fraction (i think) Has anyone had any success with these meters and their prespective on how effective they are? (i've repeated...
  14. mrtangent

    Sucess of steam quality meters

    Dear sirs, We are upgrading our steam seperators/demisters to prevent wet steam. A contact company has suggested installing steam quality meters...to measure wet fraction (i think) Has anyone had any success with these meters and their prespective on how effective they are? (i've repeated...
  15. mrtangent

    Good references describing "a typical" steam systems

    Dear Sirs/expert peoples... I am looking some useful references which describe typical standards used for generated steam in non-fired boilers.. specifically, > Acceptable levels of wetness???(0.1% 0.5% to avoid corrision errosion) > typical system setups? ie superheat or just demister...

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