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  1. Arshad Ahamed

    Use of cathodic protection (sacrificial anodes) with Cast Iron (EN-GJL-250) in ph5 submerged medium?

    Greetings, I have a customer who is to install cast-iron pump (en-gjl-250) submerged in medium (textile effluent) with pH5. Is installing sacrificial anodes a good measure to reduce corrosion rate and enhance pump life? Medium temp : 40deg C. ph : 5 Be curious, and furious in your pursuit...
  2. Arshad Ahamed

    Difference between (ISO 9906:2012) Grade 3B and Grade 2B

    Rputvin, thanks a ton for the document. All my queries have been addressed! Be curious, and furious in your pursuit for answers
  3. Arshad Ahamed

    Difference between (ISO 9906:2012) Grade 3B and Grade 2B

    Greetings Everyone, Would appreciate if you could list the fundamental difference(s) between ISO 9906:2012 Grades 3B and 2B. I have noted the submersible pumps (sewage) are to comply with this standard. Regards, Arshad. Be curious, and furious in your pursuit for answers
  4. Arshad Ahamed

    What corrosion category does SS316 fall under? Is it C3?

    Greetings All, Appreciate the response. I'll lay the context here. End-user has mentioned that the "SS316 Casting Pump to move Salty Water shall comply with C5 corrosion resistance". My client, who is sandwiched between the end-user and my company (pump supplier) has just this information...
  5. Arshad Ahamed

    What corrosion category does SS316 fall under? Is it C3?

    Greetings, Can you help me with the corrosion category under which SS316 would fall? Regards. Be curious, and furious in your pursuit for answers
  6. Arshad Ahamed

    Difference between Star-Delta and Reactor Starting Method

    Greetings, Recently, I came across a submersible sump pump with Reactor Starting Method, as opposed to Star-Delta or DOL which is mostly what we are experienced in. I've tried researching online but have found the information/explanations to be too complex. Would appreciate your help in...
  7. Arshad Ahamed

    SiC vs WC seal faces differences?

    Greetings All, Can you help me summarize/tabulate the differences between SiC and WC w.r.to the below points 1. Thermal Conductivity 2. Thermal Expansion 3. Co-efficient of Friction 4. Hardness 5. Cost? It would be highly appreciated if you could list the differences by quoting values so...
  8. Arshad Ahamed

    Silicon Carbide (SiC) vs Tungsten Carbide (WC) differences summary (used as mechanical seal faces)

    Greetings All, Can you help me summarize/tabulate the differences between SiC and WC w.r.to the below points 1. Thermal Conductivity 2. Thermal Expansion 3. Co-efficient of Friction 4. Hardness 5. Cost? It would be highly appreciated if you could list the differences by quoting values so...
  9. Arshad Ahamed

    5 kVA Electric Generator, Available Three Phase Motor, but the requirement is for a Single Phase.

    Hi Guys, So there is a situation with one of my client. They require a 1-Phase Electric Dewatering Pump to be connected to and powered by a 5 kVA Electric Generator. The issue is that I have only 3-Phase Motor Pump to supply. Solutions on how to connect and run the thing is welcome. Be...
  10. Arshad Ahamed

    Conventional Blinds or Line Blind Valves?

    Greetings, I would like to know how the conventional blinds fair against Line Blind Valves. Even though Line Blind Valves provide the benefit of very quick blinding/deblinding and minimal requirement of manpower, yet I find people preferring Conventional Blinds (Spectacle Blinds) for the...
  11. Arshad Ahamed

    The 6th impeller of a twin stage wet gas compressor increases in size (width) than the previous

    awhicker84, the configuration is exact to what you have guessed. On talking with an Engineer from our company, his guess is that the peculiar configuration would be to dynamically balance the system (he wasn't sure because he wasn't familiar with the system).
  12. Arshad Ahamed

    The 6th impeller of a twin stage wet gas compressor increases in size (width) than the previous

    Thank you rotw. You were right in the assumption - the impeller dia's are constant at 40 cm.
  13. Arshad Ahamed

    Barrier Test of Pipeline - How is it conducted?

    Thank you LittleInch. The llin ein question here is a Skin Effect Heat Traced Cross-Country Pipleline (API 5L X65 PSL2).
  14. Arshad Ahamed

    Barrier Test of Pipeline - How is it conducted?

    Greetings, I was studying about Pipeline Pre-Commissioning Activities and came across Barrier Testing. Could the experts here kindly clarify WHY and HOW the barrier test is performed. Also, could you list the logical sequence (from field experience) in which the pre-commissioning activities...
  15. Arshad Ahamed

    The 6th impeller of a twin stage wet gas compressor increases in size (width) than the previous

    Greetings, I came across a Wet Gad Compressor (2MCL-406 : Twin Stage, Horizontally Split, 40cm Impeller Dia. and 6 No. of Impellers). It is understood that the impeller size (width) would decrease as the compression progresses. The Compressor take suction from one end, has an intercooler, then...
  16. Arshad Ahamed

    Stalling of Compressors?

    Thank you rotw and LittleInch for the insight. I now understand the phenomenon a bit better (this is proving to be quite a tough nut to crack).
  17. Arshad Ahamed

    Stalling of Compressors?

    Greetings, I tried researching about compressor stalling (and consequently came across surging as well) for more information. Sadly, the explanations found were too complicated. Could you explain (such that a fresher with 9 months of experience in the refining field) what compressor stalling...
  18. Arshad Ahamed

    End of Cruve Operation of Centrifugal Pumps

    Hi, Could someone kindly clarify what End of Curve operation means and what the limits are?
  19. Arshad Ahamed

    Common issues with pumps (in general, not exclusive to centrifugal or PD)

    Hi Everyone, I was preparing a presentation covering the broad classification of pumps. I was considering adding a section detailing the common issues encountered with a pump during its operation. The information available from the internet is mostly exclusive to a single category (i.e, issue...
  20. Arshad Ahamed

    Annular and Bottom Plate of a Crude Storage Tank.

    Hi all, Could someone kindly clarify what the intended purpose, salient features, differences and the construction w.r.to shell plate of the Bottom and Annular Plate is? What implications does it have on the tank design? Also, what is the Diameter-Height ratio prescribed by the norms...

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