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Recent content by ww2

  1. ww2

    Why is there a pressure drop when the control valve was opened?

    Hi, why don't you check: IEC534-2-1 incompressible fluids IEC534-2-1 compressible fluids IEC534-2-3 flow capacity test procedures IEC534-2-4 flow capacities - inherent flow characteristics and range-ability cheers
  2. ww2

    Double Block and Bleed Valves thread408-48267

    Hello all, A double bloc and bleed valve as security to enter would not be acceptable. Complete isolation, of the concerning recipient, with blinds is the only secure and foolproof working practise. this is a safety standard and should be implemented in your procedures. cheers
  3. ww2

    superheater

    Thank you davefitz, your advise and data will keep me occupied for a while ;-) I suppose now one has a handy spreadsheet on the subject?
  4. ww2

    superheater

    Whit regards to superheater coil design I have two questions 1- What is the linear velocity of the steam through the tubes of a superheater coil and its relation to the linear velocity of the same steam through the in and outlet collectors. 2- What are the ratio limits wherein both velocities...
  5. ww2

    Same boiler other problem

    Epilogue Sorry guy's, embitterment should read embrittlement. raymond
  6. ww2

    Same boiler other problem

    Epilogue 505/04/2004 we received the report of the metallurgical examination which was carried out on our request on the dead end flange of the damaged SH outlet collector of the boiler. The conclusion of the report inputs the damage mainly to thermal fatigue and some intergranulare...
  7. ww2

    What about steam flow to the end of a pipe

    Thanks Quark, I must have overlooked that one. raymond
  8. ww2

    Same boiler other problem

    Steam inlet to the SH 195°C outlet 229°C Velocity at 3 ton/hour 4,4 m/sec; at 30 ton/hour 41,5 m/sec. Pressure differential at 3 ton/hour: 0,000 bar; at 30 ton/hour 0,035 bar Fleugas inlet 333 °C, outlet 248 °C raymond
  9. ww2

    handling H2SO4

    Thank you Fzob, I will take this in consideration. I ‘m not aware of a contractor having the necessary tools to supply the service of pulling a vacuum. But I’ ve never asked.
  10. ww2

    Converting Flowrates for Nitrogen Gases

    take a look at http://www.convert-me.com/en/; http://www.ex.ac.uk/cimt/dictunit/dictunit.htm
  11. ww2

    What about steam flow to the end of a pipe

    Dear specialists A steam super heater consists of two identical collectors for in and outlet. Between both headers are a number of identical series of pipes. The inlet on the inlet collector is diagonal to the outlet on the outlet collector assuring the same distance between in and out for all...
  12. ww2

    Same boiler other problem

    I keep you guys posted tanks again! raymond
  13. ww2

    Same boiler other problem

    Thank you guys for all your professional advice. I think we all agree that the way of operation, low loads, many trips, with the consequence of temperature changes and maybe the effect of water treatment could lead to thermal or corrosion fatigue. Also that we have to wait for the metallurgical...
  14. ww2

    Same boiler other problem

    Unclesyd, I agree with you completely concerning the metallurgical examination. We are in the process of cutting the welding neck flange (opposite the outlet) for examination by one of our universities. This is the weld where the crack was in the weld, not on a border thick/thin; weld/pipe...
  15. ww2

    Same boiler other problem

    Onclesyd The outlet flange has the maximum mass flow while on the other hand the flange with the blind has the minimum mass flow, in fact zero. In operation the wall temperature of the outlet header will be different along its length maximum on the outlet flange, minimum on the blind flange. On...
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