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  • Users: wayuu1981
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  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

    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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. wayuu1981

    185 MW Emergency Trip System ETS

    Hello, The company where I work is hiring a Chinese EPC Contractor for a new 164 net MW, CFB Boiler coal fired utility (185 gross MW), the turbine will be condensing type with reheat, 3600 rpm, HP-IP-LP sections, all directly coupled to generator. We have many steam turbines in operation...
  12. wayuu1981

    Design life of some ACFB boiler components

    Hello, the company where I work is hiring a Chinese EPC contractor for a new 164 net MW coal fired utility. The last week we received the specifications of the proposed CFB sub-bituminous B coal fired boiler of 605 t/h steam production at 540°C and 13.7 MPa, natural circulation, once through...
  13. wayuu1981

    Steam turbines rotor overspeed test

    Hello, Does anyone can tell me if there's any standard or code defining minimum overspeed values to factory test new steam turbine rotors for a power plant (170 MW, 2044psi, 1000F, 3600 rpm): 105, 110 or 120% of nominal speed? For how long must be maintained this speed? Thanks in advance for...
  14. wayuu1981

    Manufacturer's representative for welds examination

    The radiographic Evaluation By Manufacturer (T-285) and the Radiogrhap Review Form (T-292) described in section V of ASME B&PV code, refers to a "Manufacturer’s representative who performed the final acceptance of the radiographs". What are the skills, experience and certifications that this...
  15. wayuu1981

    Flat covers during heaters repair

    We will remove the high pressure water-steam heaters No.5 and 6 from a 150 MW coal fired utility, the heaters will be send to a shop for 6 months, where the shell will be inspected, and the internal tubes, plates and baffles will be replaced. Meanwhile, we will use the heaters bypass lines to...
  16. wayuu1981

    New Coal fired 150 MW, boiler selection

    In December 2012, our company must have a new 150 MW coal fired plant in operation or we'll be penalized by government. So far, we are defining some bid-terms to select the contractors for this project. The next week we have a meeting with the consultants to define the right kind boiler that we...
  17. wayuu1981

    Austenitic alloy steels, stress corrosion cracking

    I work in a coal fired power plant, we protect the boiler tubes during shut-down (including the superheaters) using the wet method with water and hydrazine. During start-ups we drain the boiler to is normal level, but the secondary and the final superheaters can't be drained, so we evaporate the...
  18. wayuu1981

    BLOW-OUT (for a C-E coal fired boiler, 500 tph, 150 MWe)

    We are changing the reheater tubes, 75 panels of 4 tubes each, so we are performing 600 site weld plus more than 1000 panel fabrication welds, all 2" diameter, 0.150" thick, using GTAW. We decided to blow-out these tubes prior to admitting steam to turbine, so we are going to disassemble the...
  19. wayuu1981

    Right PQR for an specified WPS

    A contractor is about to perform some site welds on reheater tubes of a 150MW coal fired boiler, the tubes are 2" diameter and 0.135, 0.150 thickness, my concern is: The WPS specifies "ALL" for position of groove, but, the PQR sent by contractor was perform on a 1/4" thick plate in a 3G...
  20. wayuu1981

    Boiler protection during shut-down

    We are going to cut a boiler wall section to change the reheater tubes trough this opening, the opening will be 5 meters long and 0.7 meters width (it will cut six water wall tubes). My question is: if the boiler shut-down will last 32 days, approximately the boiler wall will be cutted for...

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