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Recent content by pootong

  1. pootong

    Weld Roof Panel Tube to Boiler Drum

    Thank you all, I would give you more explanation as follows, seal weld was performed without any visual damage. It has a good appearance and material for steam drum is ASTM A 516 Gr70 for sure. Our erection sub contractor has no National Board R- Certificate of Authorization. It's very difficult...
  2. pootong

    Weld Roof Panel Tube to Boiler Drum

    Roof panel tube is designed to connect with steam drum by using tube expander without seal weld. Our erection contractor installed two roof tubes (dia 1 1/4") to the drum by using seal weld wihtout our permit. Is there any damage to the drum metal structure? No heat treatment was provided before...
  3. pootong

    Boiler Steel Column Bent/Allowable Value

    The column is intially bent after struture was erected without any load. May be it's already bent after fabrication or from the steel mill. Thanks SlideRouleEra.
  4. pootong

    High/Low Voltage Motor

    Thank you all for recommendation, I would like to give you additional information, the 220 kW motor is needed to run reverse rotation sometimes because the driven machine requirement. Is this possible to design MV motor to have CW and CCW rotation? or it is cheaper to use low voltage motor for...
  5. pootong

    Boiler Hydrotest Water Quality

    Thank you all for valuable advise, I would like to give you more information as follows. First firing and Alkaline boiled out will be 1 month after hydrotest because of the remaining work such as insulation and lagging. After hydrotest there would be some water left in superheater coil becuase...
  6. pootong

    NPSHa Margin for Condensate Pump

    Thank you all for valuable recommendation, what I found is the designer give very small margin. Let say, condensate pump NPSHR is 1.00 meter and margin is 0.39 meter that means NPSHA is 1.39 meter only. I think they wish to aviod lowering condensate pump below grade to save excavation and...
  7. pootong

    NPSHa Margin for Condensate Pump

    Is there any recommendation on NPSH available margin over NPSH required for condensate pump in power plant? Some designer give no margin, what's going to happen when the plant is in operation?
  8. pootong

    Boiler Steel Column Bent/Allowable Value

    Steel structure for boiler column is bent after erection, it can be seen by our eyes. After measurement, it is clear that the column is offset at mid span between bracing points about 15 mm. Distance from one bracing piont to the other is 6,000 mm. It is stated in AISC that allowable off set is...
  9. pootong

    Fire Protection Equipment Pressure Rating

    Our fire water system pressure is 17 Bar.g, we have some problems of selecting fire protection equipment such as deluge valve, fire hose etc. Let say fire hose, it is stated in technical data that maximum working pressure is 12 Bar.g but burst pressure is more than 30 Bar.g. The question is can...
  10. pootong

    High/Low Voltage Motor

    Our power plant specification normally stated that motor 200 kW and larger shall be medium or high voltage type. We always have problems with the contractor when it comes to the decision whether medium voltage motor should be used when motor output is slightly higher than 200 kW (let say 220 kW...
  11. pootong

    Boiler Hydrotest Water Quality

    Our boiler is 70 Bar.g/480 C 90 T/hr steam production is going to get hydrotest very soon but demin water plant is not yet ready for water production. Is it possible to use potable water (municilpal water)for hydrotest. Any recommendation is welcome.
  12. pootong

    4 Pumps in parallel

    This is normal when you run the pumps parallel, the capacity will not increased in proportion to the number of pump. Depending on the pump and system characteristic curve, if the pump curve is relatively steep compare to your system then the third and forth pump will add capacity to the system...
  13. pootong

    BS 4504 flange

    How to get a flange with nominal size of 1500 mm BS 4504 PN16 ? The standard lists only 1400 and 1600 size.
  14. pootong

    Chilled water energy metering system

    Dear All I want to sell chilled water to our customer, we will use energy metering system to measure energy absorbed by our customer. Can anybody recommend the type and accuracy of this metering system? Our chilled water flow rate is 4,500 m3/hr? This is to transfer cooling load of 12,500...
  15. pootong

    Drum sizing estimation

    Thanks Setra Can you give me any guideline to estimate the suitable size of steam drum? Regards Pootong
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