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Further to my above questions, Does the jockey pump curve need to be according to NFPA 20 fig A-3-2 Pump characteristics curve or not ? Thanks in advance again

Thanks for all suggestions, actually the problem is from the jockey pump!. The project requirement specifies the jockey pump is appoved by UL like the main fire pump. But the dispute has been made that the jockey pump is only pressure maintenance in the fire system and not classified as the...

Thanks indeed, LCREP Will only the motor be tested in that criterion to get UL/FM approved? Does it have other testings such as the material concerned, its local control panel and so forth? I've been trying to find some related documents talking about the approved criteria (in details) on...

One daft question regarding the difference between fire pump UL/FM approved and general pump in the same capacities apart from its price. Technical aspects only ! Test method? material components specified ? or even some prohibits according to the related code, NFPA ? please shed me some...

Noway2, Thank you so much for your kind advice, because I have the book of "Fire Protection Equipment Directory 2000" from UL lnc. on hand right now and even try http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index. However I couldn't find the models of the fire pressure water...

Many thanks for your kind advices; both of you

If we have the model of fire pump and its controller, how can we make sure that these models are UL listed/ FM approved? Is there any source on the internet to prove it? Thanks in advance for your kind advice.

Dear Sir If we have the model of fire pump and its controller, how can we make sure that these models are UL listed/ FM approved? Is there any source on the internet to prove it? Thanks in advance for your kind advice.

Thanks so much indeed LCREP Answer your 1st question: The churn pressure of the primary and secondary are 135 Psi and 175 psi respectively. So what should we do next? And your recommendation for 10 psi different setting sounds practice, I agree accordingly. : ) How about my first question...

Dear All I'm curious about NFPA20 regarding installation of pumps for fire. I have two questions as follows 1. In my (basic)point of view and apart from the jockey pump, I understand that A/C motor-driven fire and/or Diesel engine-driven fire pump will be set to automatically start at...

Dear Sir I need your kind help to enlighten me from my (chronic) problems that I usually face with. I'm mechanical engineer so I'm not keen in material aspects in details really. Here are my questions 1. How can I compare material grade between different standards JIS, ASTM, DIN etc? Many...

Dear Sir Does anyone have any idea about the normal (suitable) material for the HRSG stack silencer or so called "buffer" installed INTERNALLY inside the stack? Please share me your experience regarding this matter. Thanks for your kind help Best Regards

StoneCold! Yes you're right!sometimes is a performance issue and they are an exchanger bundle (answer your questions). EdStainless, understand your explanation, but our main contractor further pointed out their the method of condenser tube removal if we wanted to. The method was really too...

Dear All I have reached to the dead end of my decision with the main contractor for Power plant construction. I have a major problem of tube removal due to limited space. Our contractor said that their titanium tubes were not required to be removed for maintenance so they did not provide a...

Thank you MortenA. Actually i'm interested in typical process fluids such as steam, oil, gas, water and slurry in particular and i hope that your recommended software will fulfill my requirements so i need to visit their website for more information. How about PipeNET? Have you heard or...

Dear All After reviewed several threads talking about pressure loss calculation in pipeline (all type of fluids; compressible, incompressible etc.), I would like you to share your partical and competent experiences in this matter. My first question is whether or not there are any recommended...

Thanks everyone a lot for your many valuable suggestions, recommendations or even web sites to help me get information. For further useful suggestions, they would still be welcome..

Thanks calfer for your kind help so far, Yes I've heard about intelligent actuators but my concern is will the awarded contractor supply such expansive type?? If they do so, no doubt about it at all. Considering the worst case, unless they will supply the good one, just ordinary motor...

Thanks John for you suggestion Thanks so much for all suggestions In fact, I thought like what you suggested, what I'm concerned is we cannot do fail safe operations if power has gone as well as the lifetime of the motor actuator over the frequently-regulating operation. I really have no idea...

Thanks so much for all suggestions In fact, I thought like what you suggested, what I'm concerned is we cannot do fail safe operations if power has gone as well as the life time of the motor actuator over the frequently-regulating operation but i really have no idea why the main contractor who...