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  1. LittleInch

    Connection Between Tanks

    Odd question with no details.... Errr to flow liquid or vapour between the tanks? If liquid then a low as possible, if vapour then a high as possible. Far too many variables here to give any other opinion.
  2. LittleInch

    U-bend before pump suction inlet.

    Two options as most people say, either the inlet gets clogged and the wanted an easier way to disconnect and flush out the gunk or someone thought it could be semi self priming. Ask the operators....
  3. LittleInch

    Compensating pressure in Cryogenic Storage Tank

    Well that makes a HUGE difference. Essentially there is no pressure fall in the tank during loading of the tanker. Of course the tankers need to have held pure CO2 before being loaded, but that part of operations / tanker management to sort that out.
  4. LittleInch

    Process Chill Water Loop for Multiple Machines with varying requirement.

    your system as others have noted is just too small to be extended. increasing flow has a squared association with pressure drop. There are many details missing from your sketch including pump curves or duty points, lengths of the respective sections and elevation and also what the pressure drop...
  5. LittleInch

    Air India 787 crashes on take off

    WARNING. THIS REPORT IS FAKE AI GENERATED. But it might be being used by those not knowing to justify their opinions. And has been circulating for a few days A number of incorrect items. Flight was to Gatwick, and it wasn't raining at take off... It also didn't go into the ground at an...
  6. LittleInch

    Air India 787 crashes on take off

    Where did this get stated or confirmed? I'm not saying you're wrong, just I haven't seen anything that states this with any certainty.
  7. LittleInch

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    That's still a high pressure for a 900m long line. The other thing is to look at both extremes if this pressure includes tank liquid height. Process engineers tend to have a very worst case/ highest pressure drop approach but the pressure required when the tank is empty could be a lot lower...
  8. LittleInch

    Pump modifications

    If the impellor is to be reduced in size within the limits of the vendors pump curves then power will reduce, so so issues I can see. The change in head can be significant and hence power consumption is reduced. Key thing is to keep the impellor diameter within the minimum allowed by the...
  9. LittleInch

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    A 10" line with 62 psi going into a storage tank seems quite high unless its a long distance or you're going up a hill... Or there is a further control valve downstream the point where the flows join? It's not easy to comment further without seeing the whole process diagram from end to end and...
  10. LittleInch

    Air India 787 crashes on take off

    They appear to have been able to download the FDR and CVR from the crashed units in Delhi on Wed 25th June. Hopefully they start giving some decent answers soon.
  11. LittleInch

    What is "Free length" of springs in safety relief vavles??

    I really can't see any difference here. both say "original free length". When you measure Original free length is surely up to you? Basically they are just making sure you don't yield the spring when you compress it to solid / cant compress it any more....
  12. LittleInch

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    See below: My questions are the following: For the control valve differential pressure, should I use the 62 psig as the input for my pressure drop (head loss) calculation, by assuming the the downstream pressure end is 62 psig and add back the head loss up to the control valve outlet? At the...
  13. LittleInch

    Air India 787 crashes on take off

    The other idea skulking around is some fault or override on the TCMA system designed to cut engine power when on the ground and engines at a different power level to where the throttle lever were. Now it take a whole lot of holes to line up in the Swiss cheese, but as we've seen before, this is...
  14. LittleInch

    Plugging and wrong DP output

    A tap point below the demister? Even a very good demister will give you some sort of differential pressure which makes your level readings inaccurate. your connection point just needs to be above the max liquid level.
  15. LittleInch

    Compensating pressure in Cryogenic Storage Tank

    GD2 I think you mean the pressure drop will be faster when the tank is nearly FULL? I.e. volume change is significant.
  16. LittleInch

    Flow inconsistence

    SO what is the question here? The way you have set up your simulation fits the description. I don't know that program or how it models pump curves or valve CV. If it just assumes the pump flow is a fixed number then it will give you a fixed number. If you input the actual pump curve and valve...
  17. LittleInch

    Compensating pressure in Cryogenic Storage Tank

    But the temperature will fall a will the pressure. I also don't understand how you're planning to keep this at -31C? Just blow off excess pressure? Better to keep pressure by vaporising some CO2 outside and pumping in the gas.
  18. LittleInch

    Air India 787 crashes on take off

    The loss of power also started the spool up of the APU which could account for some of the noise heard. Even flight idle would still power all the electrics which doesn't match with the RAT and the APU seemingly firing up. The 787 is a very electrically driven airplane so hydraulic system is...
  19. LittleInch

    Flow inconsistence

    The pump 102 is only capable of pumping what is coming into the deaerator on a steady state basis. So pump 101 is only pumping at 1.8 m3/hr or less. This means that your pump is connected to a system with a higher friction losses than the pump can supply at 4m3/hr. "rated flow" for a...
  20. LittleInch

    Air India 787 crashes on take off

    I'm having difficulty seeing why would you get such a complete sudden electrical failure just at the point of take off? not saying it's not possible, but there really does need to be a triggering event in my mind. And something not being caught by monitoring or maintenance. I realise we're all...

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