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  1. micalbrch

    Tank-to-tank hydrocarbon product transfer

    "I guess need bigger pump to transfer out whole quantity within 48 hours." You can get AODs for that flow but the pressure is important, too. And the energy consumption is pretty high but if this is an intermittend operation you'll be find with an AOD, especially because these pumps are not that...
  2. micalbrch

    Pumping municipal wastewater sludges

    What is the solids concentration?
  3. micalbrch

    CE marking - Operation and maintenance manual

    CE marking acc. to the European Machine Directive is only about safety, nothing else. The supplier must provide a documentation which allows a safe installation, start-up, operation, shut down and maintenance. If there are no safety issues which have to be considered during maintenance, he will...
  4. micalbrch

    Why is NPSH can not be determined if the suction is flooded (?)

    If the vendor knows the fluid data incl. vapor pressure, he will be able to calculate NPSHA. If not, he might not be the right vendor. NPSH might not be an issue in this specific case but the vendor should be able to proof that with a short NPSHA calculation which shows that NPSHA > NPSHR. If...
  5. micalbrch

    Pump for HCl 30%

    Why not Polypropylene? You did not mention the temperature but up to 40 °C PP is still a good choice and much cheaper than PVDF. Not sure what diaphragm pump manufactureres you have checked but ABEL and FELUWA might be worth to look at. I do not think that they must offer a double head pump for...
  6. micalbrch

    MCF for Displacement Pumps

    "Thus if you don't allow for a full flow bypass / relief in the event of locked outlet flow, the PD pump can create a very high pressure until the motor stalls." Right - if you are lucky. If not something else will break or burst and that can be much more dangerous than a stalled motor.
  7. micalbrch

    Outlet of domestic pump

    Yes, that is a pressure switch which starts and stops the pump depending upon the loads. It takes care of a constant pressure, reduces peaks and can even act as a no-flow protection.
  8. micalbrch

    Pump for liquid AC charging

    Canned motor pumps. Check GRUNDFOS or HERMETIC.
  9. micalbrch

    PED and ATEX - can both directives apply for a pressure vessel?

    "Yes, but the CE mark together with the Ex mark means atex, doesn't it?" Yes, it does. But you must then also have a Declaration of Conformity from the manufacturer.
  10. micalbrch

    PED and ATEX - can both directives apply for a pressure vessel?

    CE mark does not mean ATEX. CE mark means compliance with an (any) European Directive which can be PED or ATEX (to name just two examples). And yes a pressure vessel can be subjected to ATEX. If it falls under PED than PED rules ATEX. If it does not fall under PED (as you know PED has...
  11. micalbrch

    New Engineer - Pump Pressure/ Flow Basic Question

    First you must keep in mind that pressure is the result of flow of a certain liquid through a certain pipe (material, diameter, length) and not vice versa. Simply speaking (and physically not correct) it is friction which leads to a certain pressure. The attached tutorial is a lot to read but...
  12. micalbrch

    Flange EN 1092-1

    Yes, it is stock finish.
  13. micalbrch

    Flange EN 1092-1

    B2 is Ra min. 0.8 and max. 3.2 microns, Rz min. 3.2 and max. 12.5 microns.
  14. micalbrch

    High pressure molten sulphur pump

    When I type "molton sulphur pump" in Google the manufacturers Goulds, Peerless, Rheinhuette and Hayward Gordon appear on the first page (plus a few others). At least all of these four are what I would in general call a "top supplier".
  15. micalbrch

    IE3 vs IE4 motors - price, availability

    Everybody can supply IE3 motors but only a very few manufactures have a cpl. range of IE4 motors, especially for the small sizes. If you do not have a manufacturer preference, I would not specify IE4 motors because it will be significant price adder. Companies like ABB, Siemens and VEM have IE4...
  16. micalbrch

    VSD/VFD Pump Controller PLC

    What kind of pump are you using? A centrifugal pump or a positive displacement pump? How is the VFD adjusted, manually or is there any signal which tells the VFD to speed up or slow down?
  17. micalbrch

    CE Marking on Raw Material EN10028-2 10CRMo910

    CE marking? I doubt that this is done. Probably material certificates and batch (charge) number on the raw material but I have never seen a CE on a raw material.
  18. micalbrch

    Pumping Aromatic Hydrocarbons

    Go with a diaphragm pump with PTFE diaphragms, balls and seats. An air driven pump for that flow is really cheap and works well. If compressed air is not available or if you cannot accept the pressure depending flow, search for "electric diaphragm pump". They are of course more expensive because...
  19. micalbrch

    Pump NPSHa

    Vapor pressure is about twice as high as the abs. pressure in the tank? Think about what that would mean.
  20. micalbrch

    Pump NPSHa

    Can HYSYS calculate the vapor pressure of the fluid?

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