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  1. etrobal

    client's approval of fabrication drawings

    gentlemen, thank you very much. let me explain further how this came about. our consultant, obviously not a laywer, did advise that the stamp does not hold water in a court of arbitration, in case of a fatal flow. having written that, i get the impression here that a technical lawyer, somebody...
  2. etrobal

    client's approval of fabrication drawings

    gentlemen, prior to the start of the fabrication or manufacturing of separators, tanks, through conduit valves, hot well pumps, for power plants and other mechanical items, we require the fabricator to submit detailed fabrication drawings, for our approval. in the course of our approval, we...
  3. etrobal

    has there been a submersible pump installed in a geothermal well?

    gentlemen, greetings again, indeed. one of our clients is requesting for a technical data sheet and specifications for a submersible pump supposedly for use in a geothermal well, 3500 metres deep, with the temperature ranging from 12-160degC and static pressure at 33.4mpag, flow estimated at...
  4. etrobal

    how can we convert the allowable leakage rates of API 598?

    gentlemen: we ordered two units, 30-inch motorized gate valves for our system. the valves were leak tested in the country of origin without the motor coupled, and it passed the leak tests in accordance with the requirements of the API 598. when these valves were delivered and prior to motor...
  5. etrobal

    which part of a vertical wind turbine becomes the first maintenance pr

    my apologies, gentlemen, for the seemingly unintentional insertion of the word "vertical" in my post. we are bidding out horizontal-axis wind turbines and most bidders will definitely offer hawt. our specs calls for a hawt. we are now in our final stages of ranking the bidders' offers, from the...
  6. etrobal

    which part of a vertical wind turbine becomes the first maintenance pr

    gentlemen: relative to my previous posts dated 12 August 2009 and 27 August 2009, wherein we are bidding out the erection of a more than 100MWe wind farm, i would like to solicit your kind advises or insights on which part of the wind turbine will most likely become a maintenance problem within...
  7. etrobal

    on wind turbines, which is more efficient, a 2-blade or a 3-blade?

    in wind turbines: 1. which is more efficient, a 2-blade or a 3-blade? 2. which is more efficient, a blade with a root to tip twist or one with none? at what angle would be more efficient, if ever? 3. when you specify power regulation as either pitch or stall, which would be more efficient? 4...
  8. etrobal

    are there any websites that tackles design flaws of wind turbines?

    we are currently reviewing bids from different wind turbine manufacturers and since we specified everything as 'bidder to specify', we have no inclination as to whether these bidder specified items are acceptable. this is our first time to prepare specifications, bid it out, have it...
  9. etrobal

    when will the ASME stamp becomes invalid?

    gentlemen: we had a separator delivered with its anchor bolt holes at fifteen degrees offset. installing the separator would result in a fifteen degree offset of all the nozzle connections as the poured foundation including the installed anchor bolts were based on the design drawings. the ASME...
  10. etrobal

    is there an alternative to teflon as pipe coating?

    gentlemen, we have a fluid with a high ph that if left unchecked, could create scaling in our piping system. in order to bring down the ph level of the fluid, sulfuric acid with ph at 3 was injected into the pipeline. this sulfuric acid then mixes with the fluid to attain the ph to the level of...
  11. etrobal

    what is meant by the minimum elongation required in astm a182/a 182m -

    thanks sir jones, sir ron. i did read ASTM E6 and there were for discussion items there on elongation. were these items meant to confuse rather than provide a clear definition of elongation? further to the destructive test done by a reputable third party testing agency, the test result was...
  12. etrobal

    what is meant by the minimum elongation required in astm a182/a 182m -

    sir: Table 3, Tensile and Hardness Requirements, page 9 of the ASTM STD A182/A 182M - 99, Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings and Valves and Parts for High-Temperature Service provides among other things, the Elongation in percent minimum. We...
  13. etrobal

    pressure safety valve

    gentlemen, we designed the open discharge pipeline of our bellows type, pilot operated safety relief valves with a horizontal leg of 1600mm and a vertical leg of 1200mm. will this long discharge piping system have any impact on the valve's closing pressure? or re-set pressure? the authorized...
  14. etrobal

    how can we stress run pipes or pressure vessels that are lined?

    we have had problems with solids in our pressure vessels ranging in sizes 0.625mm max with specific gravity of 4.58 to 5.30. the fluid is dry steam with max mass flow of 13.23 kg/sec, design pressure at 14.06 kg/cm2g, design temperature at 197.7degC, separation pressure of 11.72 kg/cm2g...
  15. etrobal

    how can we measure a welder's rejection rate?

    i am not sure if this is the right thread but i haven't come across a quality assurance/control thread as of yet in this forum. part of our requirements for welder's qualifications, besides being tested and qualified in accordance to ASME IX and the WPS is this section of our in-house...
  16. etrobal

    can stainless steel ss316 withstand corrosion?

    sirs, thank you indeed for the valuable information.
  17. etrobal

    can stainless steel ss316 withstand corrosion?

    we have a stainless steel, vertical, cylindrical, tank made out from ss316 plates with a thickness of 5mm, including a corrosion allowance of 3mm. the capacity of the tank is 25 cubic meters and contains H2SO4, with the applicable code as API 650, with design pressure as atmospheric and design...
  18. etrobal

    API 5L GR. B Pipe classified as not acceptable on the b311 code

    sirs, thank you indeed for your valuable feedback. appreciate your time and effort.
  19. etrobal

    API 5L GR. B Pipe classified as not acceptable on the b311 code

    sirs, does it follow then that our material specification of API 5L pipe is in conflict with our project governing Code B311? Since we cannot change the Code currently referenced for the design, we will change the pipe specification from API 5L to A53 as this is allowed by the Code. thank you...
  20. etrobal

    API 5L GR. B Pipe classified as not acceptable on the b311 code

    Appendix A, Table A-1 of the ASME B311, General Notes (1) says that "This material (API 5L Gr. B) is not acceptable for use on boiler external piping. General Notes (13) also states "this material is not listed in the ASME Boiler and Pressure Vessel Code, Section IX." Having specified our pipes...

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