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  1. rs1600

    Channel flow problem

    Thank you, i have read you reply and while i appreciate your input to describe what is happening, unfortunatly im struggling to be able to crunch the numbers. The base of the channel is flat, i gather the gradient needed to add velocity and carry the water down the channel would therefore need...
  2. rs1600

    Channel flow problem

    Thanks BigInch for the reply, I kind of understand what you are saying but guess I'm not so sure how to actually go about solving this? The problem I have is I need to ensure the channel is deep enough to accept the flow of water without flooding at any point, it is complicated by the need for...
  3. rs1600

    Channel flow problem

    Hi, im posting this here as you guys have been helpfull in the past and im hoping you can give me some pointers with the following senario? I have a 50m long smooth concrete channel, the cross section is 0.55m deep x 0.175m wide. water flows or weirs into this channel all along one side (50m)...
  4. rs1600

    Atmospheric pressure query in NPSHA calcs

    Really appreciate your input guys, i think im there now! just to make sure - Basically when converting for BOTH my VAPOUR PRESSURE & also my ATMOSPHERIC PRESSURE, from say psi to metres/hd using the follwing equation:- Head = pressure x 0.703 / Specific Gravity i now know the pressure figure...
  5. rs1600

    Atmospheric pressure query in NPSHA calcs

    Thanks guys, looks like im not too far off then, but still not quite there (been sat on the computer all weekend!) Micalbrch, you state 'atmospheric pressure has nothing to do with fluid SG' yet i have used the SG of water at 30C to get my answer? this is what is confusing me i.e. if the water...
  6. rs1600

    Atmospheric pressure query in NPSHA calcs

    Appologies for another NPSH question but i just cant seem to find the confirmation i need on the following query. pumping water at 30C from an open tank static head = 0.99m fluid density = 995.646kg/m3 friction losses = 1.472m vapour pressure = 0.434m atmospheric pressue = m To get vapor...
  7. rs1600

    Gravity drainage pipe size question

    Thanks Katmar, I have read through the attachement you posted earlier which makes a bit more sence (except the fractional figures table, which im not sure how to apply yet). most of the equations and tables i have looked at relate to sloping pipework, rather than vetical? could you tell me...
  8. rs1600

    Gravity drainage pipe size question

    ok thankyou ione, 25m3/hr. would not be enough, therefore i assume if the tank is vented separatly then 275m3/hr is the max. flow down the 6" as mentioned in katmar's original post or am i completly off track here? this would mean 1 No. 6" pipe would be ok, instead of 8 No.
  9. rs1600

    Gravity drainage pipe size question

    Thanks all for the input. Lan132, have you suggested 1:200 slope because there is no chart/info. for a completely vertical pipe? Also is it possible to explain how you worked out the 90mm water depth? I would guess that the depth would increase moving away from the drain point? Katmar, I will...
  10. rs1600

    Gravity drainage pipe size question

    Appologies, I was refering to a 'typical' 25m long swimming pool at your local leisure centre. Assume 25m long x 12.5m wide swimming pool with a 200mm wide x 400mm deep channel around the perimeter. However, if i can deturmine what m3/hr. a 6" pipe can flow with 100mm water depth, will this...
  11. rs1600

    Gravity drainage pipe size question

    Hi, i am hoping someone will be able to offer me some help with the following query in as simplistic fashion as possible. Take a typical 25m swimming pool with an overflow channel around the perimeter of the pool. Assumiing the flow into this channel is 200m3/hr. In the base of the channel...

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