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  1. bulkhandling

    B31.3, Category M, Sensitive Test

    I'm in mining consulting business where there are not many Category M fluids. We use B31.3 for piping design. Per ASME B31.3, para. M345 Testing, a sensitive leak test shall be included in the required leak test. My understanding is : a normal hydrostatic test is required (1.5x design...
  2. bulkhandling

    PVC for Cyanide Piping

    I posted this under Polymer Processing but maybe this is the right forum. A PVC pipe for sodium cyanide transportation needs to be replaced due to aged material. Does anyone know if any code or regulation is related to the piping material for cyanide solution? I need to decide if I have to use...
  3. bulkhandling

    PVC for Cyanide Piping

    A PVC pipe for sodium cyanide transportation needs to be replaced due to aged material. Does anyone know if any code or regulation is related to the piping material for cyanide solution? I need to decide if I have to use a CS pipe (our standard pipe spec) or use a new PVC pipe( same as original...
  4. bulkhandling

    Low Pressure to High Pressure thru Venturi

    Low pressure flow 100 gpm pressure 20 psi High pressure flow 2000 gpm pressure 100 psi Is it possible to inject the low pressure flow into the high pressure flow using a Venturi unit? No booster pump available. How to do the calculation? A real problem.
  5. bulkhandling

    Small pipe discharge: open channel or siphon

    For a 3" sch 80 water pipe to a high point and down hill to a low point discharge, is the downhill part pipe full or open channel? The pipe elevation is 6 ft lower than the high point and total length is about 10 ft. As we know, for a small pipe (or tube), the pipe will always be full flow no...
  6. bulkhandling

    3600 rpm or 1800 rpm in series??

    Many people have a strong preference of 1800 rpm other than 3600 rpm pumps. In many cases, with the combination of flow and head (relatively low flow and high head), 3600 rpm are often proposed by the bidders. For alternative, two 1800 rpm in series can replace an 3600 rpm pump for the same...
  7. bulkhandling

    Ductile Iron Impeller or SS?

    In a few projects, I met the problem. Some bidders proposed duplex stainless steel CD4MCu for impellers while some other bidders proposed ductile iron impellers. The applications are for water with no or little solids. Normally the bids with CD4MCu is about 10% higher than the DI bids. I like...
  8. bulkhandling

    Pump Curve Has a Maximum Head

    This is an abnormal curve. When the flow increases from zero flow, the head gets bigger till to a maximum point and then the head get lower like a normal curve. I know this kind of curve is not good but do not know what may happen or what will be the impact in the operation. Need your help.
  9. bulkhandling

    Hi-Chrome Iron and Caustic Soda

    There is 2% caustic soda and some cyanide in the ore slurry (up to 25% solids). Slurry temperature can be up to 150F. I need to find right pump material to pump it. Alloy 2205 may be ok except cost is to high. Does anyone know if Hi-Chrome (Hardness 600)is good for this service? Or any other...
  10. bulkhandling

    Frequent motor start-up

    A 4 pole motor, 200hp, will have to start-stop for 6 times per hour (or 12 depends on the control philosophy). I know that 4 cycles are normally allowed for this motor size, but we have VFD so we can start at low speed. The load in each cycle will be 81 brake horse power for 1.5 minutes and 159...
  11. bulkhandling

    Yield Strength, Elastic Limit, Creep Effect

    HI, How can I get the yield strength of A335 P22 at temperature of 955F? Is the following correct? 30000/20000x11000=16500 Where, Yield strength at normal temp=30000psi Allowable stress at normal temp by ASME B31.3=20000psi Allowable stress at 950F by B31.3=11000psi My problem is that the pipe...
  12. bulkhandling

    Stress Intensification Factor for Socket Welds

    For the stress analysis of small piping, a 2.1 (some people like to use 2.0) SIF for socket weld is normally used. I know Code B31.1 or B31.3 allow us to use a smaller SIF=2.1*T/Cx (Where T is the pipe wall thickness and Cx is the heightof welds). So when the pipe stress is high at SIF=2.1, I...
  13. bulkhandling

    Where to find metal yield strength at 955F

    HI, How can I get the yield strength of A335 P22 at temperature of 955F? Is the following correct? 30000/20000x11000=16500 Where, Yield strength at normal temp=30000psi Allowable stress at normal temp by ASME B31.3=20000psi Allowable stress at 950F by B31.3=11000psi My problem is that the pipe...
  14. bulkhandling

    Thermal stress in pipe flanges

    A flange connection is designed on a condensate blowoff pipe (cycles can be 50 to 200). The design temperature is 1050F and pressure is 50psig. Flanges are Class 300 with one material 304ss, the other P91. My question one is, during start-up time, High temperature steam can make the inside...

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