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  1. flamearrow

    Micro Irrigation Pump flow rate

    Hi I got a automatic micro irrigation system with different zones containing sprinkler, dripper and bubbler which are designed to operate at different time. How could I determine the flow rate of the pump? Thank you
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    Hi Gentlemen Could anybody provi

    Thank you guys very much for the replies. I really got something to initiate
  3. flamearrow

    Hi Gentlemen Could anybody provi

    Hi Gentlemen Could anybody provide me guidelines/procedure of testing and commissioning of MBR? at least the main components
  4. flamearrow

    Residential range hood-high rise building

    Thanks Joe Campbell, your attachment was useful.
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    Residential range hood-high rise building

    Hi Guys, We have 28 kitchens in a 7 storey apartment connected to 2 no of roof top exhaust fan. designed CFM for a kitchen is 80. when I checked with suppliers of range hood, I could not find hood having pressure loss data.most of the hoods are more than 200 CFM, which I think too high...
  6. flamearrow

    Pressure gauge reading

    I Thank all you guys for the reply, and LittleInch sorry I will correct the language, thanks for correction.
  7. flamearrow

    Pressure gauge reading

    Thanks, LittleInch, but I am still baffled coz despite the reading mechanism of the gauges in the fluid flow, the effect will be the total pressure (if the velocity pressure is not negligible as you mentioned) which is going to be converted into the reading, isn't it?
  8. flamearrow

    Calculating room pressure

    Hi Guys, Is there any method to calculate the room pressure from CFM and other available parameters without measuring from devices? thanks
  9. flamearrow

    Pressure gauge reading

    Hi any Savvy, Would anyone explain to me what the pressure gauge in the fluid pipe reads (either analog or digital), I mean static or total pressure? I found from some web sources that it reads only static and we need to add the velocity pressure. Thanks
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    Hi How to determine the return a

    Thank you all for the replies, Lnewqban, yes the infiltration should have been taken into account. either +/- pressure, we can calculate certain amount of air to compensate. could you please help me to calculate the infiltration rate?
  11. flamearrow

    Hi CARRIER HAP load calculatio

    Thanks Guys Robertogrrmos, you must be right, though the heat transfer equation shows only the area, the U value should depend on the thickness. I meant same wall that the same area and orientation.
  12. flamearrow

    Hi How to determine the return a

    Thanks Gents, I would like to know the EA and RA rates, I mean I the designer came up with those numbers? is there any rules to size the return flow or is it from the equipment data?
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    Hi How to determine the return a

    Thanks FL Eng, I am asking about the supply and return rates, please find attached picturehttp://files.engineering.com/getfile.aspx?folder=f99ff5ae-8bfe-483c-b120-11124b504c90&file=RETURN_AIR.jpg
  14. flamearrow

    Hi How to determine the return a

    Hi How to determine the return air flow rate and exhaust air flow rate of AHU? OA & supply air shall be calculated. all I know return has to be same as supply and OA shall be subtracted, but I found in other designs that return is taken 2-10% less the the supply rate ,can anyone please tell...
  15. flamearrow

    Hi CARRIER HAP load calculatio

    Hi CARRIER HAP load calculation shows different heat load for a same roof/wall with same U value but different thickness. Logically more the thickness greater the heat/cooling load but by the equation of heat transfer for wall/roofs it only depends on the area, U and temp.difference could...
  16. flamearrow

    Recirulation pump under performing

    Guys, thanks for the replies Pump supplier suggests test bench testing, lets see
  17. flamearrow

    Cavitation in suction lift centrifugal pumps

    Hi Gents, Thank you for your replies, LittleInch, you are right, when we calculate the available head, but what does the pressure gauge at suction read? it is the static pressure resulted from all losses (velocity head to be added to get the total pressure) so if the pressure just before the...
  18. flamearrow

    Recirulation pump under performing

    LittleInch If other factors are normal, then possible reason for low flow will be from foot valves. foot valves might not open fully, means need to go for less stiff foot valves. What do you say? Note that the foot valves used here PN-16 & 10.
  19. flamearrow

    Recirulation pump under performing

    Pressure gauges are new, calibrated. did not find any noticeable clogs. Flow measured with ultrasonic meter and later realized it might not be accurate if flow is low. then new calibrated turbine flow meter installed. Not much difference in the reading. Impeller/ Volute checked, precipitated...
  20. flamearrow

    Cavitation in suction lift centrifugal pumps

    Hi, To avoid cavitation in centrifugal pumps it has been stated that the static+dynamic head at suction to be greater than the vapor pressure, my question is, if the static reading is negative and the suction velocity head is too small then the total head is negative which is less than the...

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