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Recent content by wayuu1981

  1. wayuu1981

    Volumetric examination in header nozzles weld

    Hello, We are writing the technical specifications for contracting the replacement of secondary superheater panels and their connecting tubes to inlet and outlet headers in a 150 MW coal fired power plant. Nozzle to header connections are similar to illustration z-1 in Figure PW-16.1. Header...
  2. wayuu1981

    Maximum metal temperature for water filling superheater tubes after outage

    Hello, We have increased water make-up on our 150MW coal fired power plant. Water consumption tendency indicates we cannot wait until next planned outage son we need to stop the plant, cool it down, locate and repair failed tube, and restart until planned outage. As every hour offline counts...
  3. wayuu1981

    Cold drawn vs hot rolled superheater seamless tubes

    We are trying to purchase some SA-213 TP304H cold drawn tubes, 2 in diameter, 0.220 in thickness, in order to replace the secondary superheater (platen) panels in our pulverized coal fired 150 net MW boiler. the design steam outlet properties are: 1880 psi, 1000 F As we are running out of time...
  4. wayuu1981

    Chloride content guidelines in the water of a 2100 psi pressure boiler

    The boiler protection is AVT with filming amine, and the boiler is natural circulation with drum and reheat. Condenser is cooled with seawater, so we constantly measure chloride levels in condensate and boiler water with ion selective electrode method and we get values around <0.2 ppm in...
  5. wayuu1981

    Chloride content guidelines in the water of a 2100 psi pressure boiler

    Hello, I'm trying to look for limits and guidelines about chloride content in the water for high pressure coal fired boiler (meassured in make-up water and boiler drum). I have foung some information but it's so dispersive, I've seen limits from 12 PPB to 50 PPM (more than 4000 times...
  6. wayuu1981

    Boiler starting fuel tank capacity

    Thanks for the answer, but it would be great if anybody can provide a reference value of diesel oil tanks capacity installed in existing plants to compare values of storage_capacity/MW others are using, as I said, just for reference. Javier Guevara E. Projects, Mechanical Engineer
  7. wayuu1981

    Boiler starting fuel tank capacity

    Hello, What could be a minimum recommended storage capacity for the light fuel oil tank of a 300 MWe coal fired CFB boiler, to take it from cold state up to 40% BMCR capacity, fuel oil won't be required for combustion support. Is there any standard suggesting minimum capacities? or is there any...
  8. wayuu1981

    ASME Power Boiler stamp

    I'm working in a Project in South America where it will be installed a 300 MWe coal fired power plant, designed, manufactured and erected by Chinese contractors. The requirements specified that the boiler shall be designed, manufactured, erected and tested according to the latest version of the...
  9. wayuu1981

    Sliding pressure operation on a constant pressure unit

    Hello, I have been reading about sliding (variable) pressure operation and constant pressure operation for load regulation on steam turbines. The way I see it, sliding pressure operation (or hybrid pressure, about 0-90% sliding and 90-100% constant) has some advantages over pure constant...
  10. wayuu1981

    Unit Heat Rate vs Output

    Hello, As long as I know, it depends on many factors, one of them is the method used for regulating turbine load (constant pressure or sliding pressure, and the number of turbine admission valves). Attached I'm sending a figure taken from the book COMBUSTION, FOSSIL POWER SYSTEMS, by Combustion...
  11. wayuu1981

    Unit Heat Rate vs Output

    As long as I know, it depends on many factors, one of them is the method used for regulating turbine load (constant pressure or sliding pressure, and the number of turbine admission valves). Attached I'm sending a figure taken from the book COMBUSTION, FOSSIL POWER SYSTEMS, by Combustion...
  12. wayuu1981

    Regenerative Air Pregeaters in ACFB boilers

    Hello, We are selecting a contractor for a new 300 MW coal fired utility in South America, the boiler will use ACFB (Atmospheric Circulating Fluidized Bed) technology. In the same place we are already erecting a 150 MWe unit with ACFB boiler and one regenerative Ljungstrom air preheater. For...
  13. wayuu1981

    Number of startups during boiler service life

    Thanks for your quick reply, As it has been ussual where the plant is going to be erected, it will be originally considered as base load but after some years it will operate at cycling load according to market requirements. According to that, what I would like to know, or at least to have an...
  14. wayuu1981

    Number of startups during boiler service life

    Hello, is there any standard or common practice to define the number of startups during a boiler service life (cold, warm and hot startups). Our company is working on the bid terms for a new coal fired utility, 280 MWe, ACFB boiler, and we would like specify a minimun number of startups during...
  15. wayuu1981

    Replace of boiler's pressure relief valves

    Hello, We need to contract a company to remove three (3) old safety valves, and install new valves on a 150 MW coal fired boiler (the valves have been previously purchased with V stamp, and they are stored in the plant ready to be installed). What kind of stamp is required for the company that...
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