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  • Users: Pucp
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  1. Pucp

    Standard deviation calculation

    Hi I have measured a dimension of particles (L) as a function of time. I measured several particles for each time. Then I got for each time a mean value and a standard deviation. No problem with that. Then I plot my data (mean value of L and time) in the form: L2 - Lo2 (L-squared minus...
  2. Pucp

    How to make the average of two Excel graphs?

    Hi, I have TWO different tensile test data (x=elongation, y=stress) from the same material. I want to AVERAGE them and generate just one curve but the main problem for me is that the tensile machine took data at DIFFERENT X (elongation) values in the two tests. So for example in one test I...
  3. Pucp

    Vitra-Glass bowls in Vertical Turbine Pumps

    Hi, I have read about intermediate bowls in vertical turbine pumps that have vitra-glass lined waterways for maximum efficiency and wear protection. But I will like to know if this is a common process or if it is only applied by ITT pump companies (Goulds pumps, Bell&Gosset pumps, etc.). Also if...
  4. Pucp

    LEROID G24 compressor

    Hi, I need to find technical information (power, rpm, etc) of a LEROID G24 Compressor, I can´t find their web page and any web page related to this product. It could be a spelling problem. I will appreciate your help. Thanks in advance. Ian
  5. Pucp

    Plug Gage and Taper Gage for NPT

    Hi,our Quality Assurance Department has to control several components having 1/8"NPT thread, I have heard that we have to use a plug gage and also a taper gage to ensure we get a proper seal to the threads. Can anyone explain me the difference between those types of gage?, what measures...
  6. Pucp

    Rewinding from three phase to single phase

    Hi, I have to test a submersible pump (1.6 - 2 Kw and 1.1Kw two pump models)that uses as a standard a 2HP 2 poles three phase electric motor 60 Hz (with all the factors is enough to the power required by the pump) . But now we want to assembly the same 2HP 2 poles 60 Hz but rewinded to single...
  7. Pucp

    Parallel Pump Selection / Doubts with head losses

    Hi, I have the following problem. We have to select pumps for a big pumping station. We have to deliver 6000 l/s, and we want to use 10 pumps (vertical turbine pumps) in parallel operation (600 l/s each one). I can calculate each pump in its line (with butterfly valves, check valves ) but then...
  8. Pucp

    Flow measurements

    Hi, does anyone know the best flow measurement device for water without using turbine or ultrasonic ones. We need this device for 600 l/s, 1500 l/s, 750 l/s, 150 l/s. The water came from a river. The main problem is that we want to use one that allow us the minor distance required (for less...
  9. Pucp

    Pumping station design

    Hi, I am working in an irrigation project, and we have to design the pumping station (10 vertical turbine pumps and 1 in stdby. There are channels for water transportation from the river and we want to use the Hidraulic Institute Standards configuration for the sump with the same calculate...
  10. Pucp

    Pipe dimensions and tips

    Hi, I have to deal right now with pipe diameters larger than 42" for an agricultural project ( I do not know what is the largest comercial diameter), but I have no information about comercial sizes, schedules or types of pipes. I will prefer to use steel pipes. So I will appreciate if...
  11. Pucp

    Bolts grades and materials

    I have purchase bolts for my company, but I have only specify the material (AISI 4140). This is because we have calculated that in the annealed condition it would work well. But I have read in some paper that this material could be use or could correspond to bolts - Grade 8. I know that AISI...
  12. Pucp

    How to recognize NITRONIC 60 nuts for quality control

    Hi, we are going to receive (import) NITRONIC 60 nuts in a large quantity, but is the first time we are going to see this material so we want to know how to recognize it. I mean, some kind of chemical reactive to put on, magnetic properties, color, I do not know, some tips that help our quality...
  13. Pucp

    Submersible motor minimum speed

    Hi, I need to know the minimum speed for a 300HP Hitachi (1740 rpm) submersible motor that work with a frequency converter. This motor is used with a 11 stage deepwell pump. Somebody tell me that it is at maximum 80% of its nominal speed, this is, he said, because with less speed the axial...
  14. Pucp

    Jominy test

    Hi, a purchaser have asked us about the Jominy test of some of the materials we use in our pumps, exactly about our pump shaft. What I want to know is if Jominy test cover all steels, I do not have right now the ASTM procedure to know the scope so I mean stainless steels and air hardenable...
  15. Pucp

    Jominy test

    Hi, a purchaser have asked us about the Jominy test of some of the materials we use in our pumps, exactly about our pump shaft. What I want to know is if Jominy test cover all steels, I do not have right now the ASTM procedure to know the scope so I mean stainless steels and air hardenable...
  16. Pucp

    Jominy test

    Hi, a purchaser have asked us about the Jominy test of some of the materials we use in our pumps, exactly about our pump shaft. What I want to know is if Jominy test cover all steels, I do not have right now the ASTM procedure to know the scope so I mean stainless steels and air hardenable...
  17. Pucp

    Parts made of Nitronic 60

    Hi, I work in a pump company, and a purchaser have ask us about a part of a pump (nuts) made of Nitronic-60 (I have never heard about it), we only work with steels, stainless steels, and foundries, also with bronze, brass so I will appreciate if anyone can tell me where I can find the best...
  18. Pucp

    Nitronic -60 / Galling

    Hi, I work in a pump company, and a purchaser have ask us about a part of a pump (nuts) made of Nitronic-60 (I have never heard about it), we only work with steels, stainless steels, and foundries, also with bronze, brass so I will appreciate if anyone can tell me where I can find the best...
  19. Pucp

    NSPH and PUMP PERFORMANCE DOUBTS

    Hi, I will like more about water pumps, because now I have to deal with them, I have read a lot but francly I have a lot of doubts. So I will appreciate a lot if you answer some of my questions: 1)How can I measure the NPSH - R in a new pump? Does I have to introduce friction losses and wait...
  20. Pucp

    Math equation for the pump diagram

    Does anybody knows how to find the mathematical relations for the pumps diagrams. I want to find efficiency only with the information of pressure and flow rate, as an equation, but for that I have to introduce the diagrams as data for math equations. I can put the Pressure-flow rate curve in a...

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