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  1. FMJalink

    Reciprocating compressors

    Hi macabihaifa, As mentioned above, in theory possible and a nice cost reduction investigation, but give it low change of success. Just a simple indicative approach: Per stage you have a pressure increase with a pressure ratio r = p_out/ p1_in. The volumetric flow rate decreases inversely...
  2. FMJalink

    Packaged Wastewater Treatment Recommendations

    Hi JC2021, Just a little advice concerning the client opting for a sand mouth septic field. Prior to getting physically involved, check whether such a system is still allowed by the (local) authorities. Nowadays often some kind of (pre)treatment is prescribed before discharging on "open waters"...
  3. FMJalink

    Buckled Internal Shell under Half-Pipe Jacket: FEA Options for FFS?

    TGS4 - Thanks for the explanation. Appears there is some difference in how things are to be handled in the USA and over here in the EC, though in basis very simular. I did mean a damage as here applicable. Most likely a NoBo would that not see as a normally possible damage, but as a...
  4. FMJalink

    Buckled Internal Shell under Half-Pipe Jacket: FEA Options for FFS?

    @TGS4, I have to admit not to have experience with pressure vessel regulation in the USA, but your statement "ASME Section VIII, Division 1 is for original construction only. So, UG-80 is no longer relevant." seems a bit strange or just on a specific point in the discussion. To my knowledge...
  5. FMJalink

    Contract Clause Question

    Hi swazimatt, To my opinion the original statement is too much in the direction of the consultant and not in the direction to the services to be performed by the consultant. You want "good" services from the consultant, which also requires a "good" consultant. I like therefor the second phrasing...
  6. FMJalink

    Under-reinforced beam

    This is not my area of knowledge, but what I read here amazes me somewhat. Presuming this concerns a new construction where people will be in and/or on. A new beam having only 56% design bearing capacity is to be fixed up to meet the reinforcing cross sectional area by means of adding plate(s)...
  7. FMJalink

    Compads on API650 Tanks

    Hi Batie, If the tanks were not designed and constructed to API 650, they were most likely designed and constructed to BS 2654. Depends on what the company described and the industry you are in, e.g. fine chemicals or pharmacy normally do not describe petroleum industry equipment. As mentioned...
  8. FMJalink

    Help for Calculate C on Miter Bend Formula

    Hi jafary64, To my experience the actual corrosion allowance for chemical attack etc has to come from the owner/user, licencer or material expert knowing the substances going through the bend taking temperature and required lifetime in account. Mitered bends I normally see only in case of...
  9. FMJalink

    Hydraulic motors in series Problem!

    Hi Jan1235, I think the following (simplified) happened with your original set up. One flow stream entering and leaving the system with 4 hydrmotors in series. With no real constant load on the rotors, the load on each motor comes from the acceleration of the coupled disc. If I did understand...
  10. FMJalink

    calculate temperature of saturated steam discharged to atmosphere via leak

    Hi BigChungus, I am afraid your question is a difficult one to be solved. The first cooling will be from the expansion in the jet leaving the hole in the wall or at a gasket, but straight afterwards the mixing with ambient air starts and leads to condesation which will be the determining factor...
  11. FMJalink

    Pressure Testing of Valves 2

    Hi Inchtain, To my experience requirement of having a third party involvement comes from government, insurance or user/owner and is not specified as such in referenced codes and design specifications. It normally used to have an independent party, not feeling the force to get it finished...
  12. FMJalink

    Non- Refrigerated Body Storage Temperatures?

    Hi PagoMitch, I did not see anything on the applicable climatic conditions, which might quite important for decisions and ideas. In Alaska the cooling problem will be limited to days per year, but on Hawai cooling will be a main design issue. Other main points are the desired storage capacity...
  13. FMJalink

    Seal Leak in Atmopsheric side Cold Service Pump

    Hi Jungpao, As you mentioned it occurs only during de-icing, it seems to have to do with still cold internals and heating up of the casing outside. Could be something as the seal bellow is still cold and the casing already extensioned (locally), having the bellow not providing sufficient...
  14. FMJalink

    PSV Sizing On N2 Receiver Vessel

    I have to correct myself on the statement: "If your PS is sufficiently above the maximally possible pressure, why put a safety valve on the pressure vessel?" That is not correct as the equipment/unit is allowed to be used up to PS. There are two other documents to made or completed, that are the...
  15. FMJalink

    PSV Sizing On N2 Receiver Vessel

    Hi Pavan Kumar, I assume there is a "no" missing in your original posting and you wanted to say ... no flammable/combustible in the vicinity. If there cannot be a fire, you do not have to design for it, unless requested to be included. You appear to be in North America designing or making...
  16. FMJalink

    Settlement of supports on 2 span beam Formulas

    Hi chorner26, I would start from the differential equation for a bending beam. Allows all parameters to be adjusted to your liking. Keep in mind that a small difference in support relative elevation has a substantial impact. I only have experience with the Eurocode, but your code will also give...
  17. FMJalink

    PSV Sizing On N2 Receiver Vessel

    Hi Pavan Kumar, You are telling that the N2 buffer tank operates on 19 bar(g) @ 34 °C and that 19 bar(g) is also the maximum pressure the vessel can see. Usually one has a minimum and a maximum operational pressure for the N2 coming from an air separation plant. Did you look at the maximum...
  18. FMJalink

    Pump lost some flow after testing

    HiMechNerd08, If I understand you correctly, a shut-off pump test was performed. Centrifugal impellers normally have a minimum flow limit due flow stability and a minimum flow limit due to thermal liquid properties. The stability limit has to do with the impeller not being alble to throw the...
  19. FMJalink

    How to interpret "pressure" in incompressible fluids pipes

    Hi adrich91, As far as I know, there are no really inompressible liquids. As the molecules in a liquid are very near to each other, the pressure increase is high with a small volume discrease.This normally allows liquids to be co sidered to be incompressible, allowing easier formulas/mafhematics...
  20. FMJalink

    Help with recirculating pump above tank level

    Hi tonbaldin, Could be a good start to review the pumping design calculation on too positively assumed values or missed items, as liquid accelleration & resistance at suction line inlet, resistance of the foot valve and vapor pressure. Another point could be air bubbles or even an air layer in...

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