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  • Users: norzul
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  1. norzul

    Steam Trap Type

    Just checking anyone got experiece operating venturi type steam trap? How is it compared to the conventional mechanical type?
  2. norzul

    Ethylene Cracker

    Anyone knows about ethylene cracker?
  3. norzul

    GTG Delivery Period

    Hi, Anyone got any info regarding the fastest delivery period of 25MW GTG? Was informed that at present due to increase work load/order all around the world, the delivery period has increased. Example, last year when we placed the order for 4 GTGs, the delivery period was only 12 months. Now...
  4. norzul

    Bypass Stack

    Hi, Anyone got experience with regards to the installation of bypass stack between GTG and HRSG. What are the pros and cons on having this bypass stack. I was informed by the HRSG vendor that nowadays about 90% of their installation is without bypass stack. Thanks norzul
  5. norzul

    GTG-HRSG Startup

    Hi, In 4 to 6 months time we are planning to commission 4 GTGs (F5 size) and 4 HRSGs (95 t/h with supplementary firing). Our gas turbine is closed coupled with the HRSG without the bypass stack i.e. if GTG down, HRSG will also down, vice versa. I was informed that due to not having a bypass...
  6. norzul

    Offline Water Wash System for F5 GTG

    Hi, Anyone got experience with regards to frequency and duration for offline water wash for frame 5 gas turbine? norzul
  7. norzul

    Venting NG to atmosphere

    Hi Guys, Have yu got any experience venting NG to atmosphere? Concerns on explosion, safety, etc Thanks norzul
  8. norzul

    HIPS (High Integrity Protection System)

    Hi Guys Anyone familiar with HIPS (High Integrity Protection System) and would like to share previous experience? Thanks norzul
  9. norzul

    Fuel Gas Skid for Gas Turbine

    Hi Guys, I'm currently involved with the cogeneration project. Now under construction phase. We're going to install 4 GTG and 1 STG. Our GTG got the supply of NG for the national grid. Each GTG has its own fuel gas skid consists of filters, dual SSOV (safety shut-off valve) and pressure...
  10. norzul

    Epoxy Grout vs Non-Shrink Cement Based Grout

    Hi, We have 4 gas turbines for our cogen project. Now under construction phase. Our spec is epoxy grout. The eqpt supplier recommend non-shrink cement based grout. Any opinion? Thanks NORZUL
  11. norzul

    Eddy Current Testing vs Magnetic Particle Testing

    Hi Guys, Quite recently, we had a turbine blade broken during the no load mechanical running test (NLMRT) at supplier factory, prior to shipment to site. The supplier standard practice is the followings: 1) After fabrication/machining of the blade, a 100% magnetic particle test (MPT) will be...
  12. norzul

    No Load Mechanical Running Test (NLMRT) for STG

    Hi Guys, Anyone got any previous experiences pertaining to the no load mechanical running test for the STG? Is it a common practice not to carry out the NLMRT for the STG (Steam Turbine Generator) as part of the purchase requirement? Thanks norzul
  13. norzul

    Double Volute vs Single Volute

    Hi Guys, We plan to install 3 circulating cooling water pump (from cooling tower) for our cogen project. Initial Spec 1) 4800 m3/hr 2) 47m 3) Double volute 4) 740 rpm 5) 680 kW However, due to process optimization, the head was reduced to 36m. Because of this the supplier requested changes...
  14. norzul

    Wrapping vs Coating for Underground Piping

    Hi Guys, Anyone got something to share on the protection of the underground (UG) piping? For our project, based on the specification, the UG piping (firewater line and oily water sewer line) needs to be coated and wrapped. We had a meeting this morning & somebody mentioned that it is either...
  15. norzul

    Carbon Steel for Instrument Air Pipe

    Hi, Is it common to have API 5L B (without galvanised) for the instrument piping material? Based on my previous experience it should be pre-galvanised, however on my current project it is specified as API 5L B without galvanised? Any advise Thanks norzul
  16. norzul

    DGS for Recycle Gas Compressor

    Hi, Any experience to share on retrofiting of seal oil system to Dry Gas Seal (DGS) for the recycle gas compressor (200bar discharge) for the hydrocraker unit? Thanks norzul
  17. norzul

    Heat Recover Steam Generator (HRSG) Ramping Rate

    Hi, We just procured 4 HRSGs for our cogen project. It has supplementary firing (SF) capabilities. Without firing the production is about 50 ton/hr. With SF, 95 t/h. The ramping rate is 15 ton/hr per minute. Is this quite typical for this size of HRSG? I've checked our existing boilers...
  18. norzul

    3 Steam Inlet on Condensing Steam Turbine

    Hi Guys, Does anyone got any experience with 3 level of steam(40bar;10bar;3bar) inlets to condensing steam turbine (about 25MW : Siemens/Alstom machine)? What is the complexity in terms of design & operation? Any advise? Thanks norzul
  19. norzul

    Offline & Online Washing for Gas Turbine

    Hi, We'd procured 4 X 25MW gas turbines (GE/NP). Got some question on the washing facilities: 1) Based on your experience, what is the typical & optimum frequency of online and offline washing 2) Water quality? Thanks norzul
  20. norzul

    Tripping of Gas Turbine Generator (GTG) on Failure of Extraction Fan

    Hi, We had discussion this morning on GTG protection. Is it common to trip a gas turbine due to failure of extraction fans? Fyi, the GTG is located inside an ecoustic enclosure. There are 2 X 100% extraction fan (1 ruuning + 1 standby). I was told that if both the extraction fans are not...

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