Dear Erik
This is pump characteristics:
PUMP:RADIAL FLOW :
Rated Flow = 0.62 <m3/s>
Rated Head = 41 <m>
Rated Speed = 990.005 <r.p.m.>
Rated Power = 400 <kW>
Pump Inertia = 1.1 <kg m2>
Motor Inertia = 17 <kg m2>
Speed Ratio = 1 <>
Friction Torque = 0 <N m>
Sub-form : Thermal Capacity :-
Initial Speed = 990.005 <r.p.m.>
and accumulators:
ACCUMULATOR : : 012001 : 17/12/03 : 11:27:06
Group : AIR VESSEL
Outflow Loss = 1 <>
Inflow Loss = 1 <>
Diameter of Inlet = 0.6 <m>
Horizontal X-Sectional Area = 4 <m2>
Accumulator Height = 7 <m>
Base Level Above Reference = 2.88 <m>
Polytropic Index = 1.4 <>
Vapour Pressure = 0.02062 <bar>
Liquid Type = 2
Sub-form : Thermal Capacity :-
Liquid Level = 5.5 <m>
normally we use compressor to balance the pressure of
the tank.
if you need additional info please let me know.
Best regards
Omid
- Erik <erik.scheir@pandora.be> wrote:
> Hi Omid,
>
> What kind of tank are you talking about?
> Is it an accumulator or a bladder or a vented air
> vessel?
> What are the pump characteristics? (Curve, Moment of
> Inertia,...)
>
> Erik
>
> -------Original Message-------
>
> From: <a href="/group/PipingDesign/post?postID=DPXDNFcx6TQSCS1iP06OvYByXXFankdQaKtVyVtBI4Jc_QSi_hCuWn3_4slQAUk_wSy0rbQu772JQrz3kwxB-9TYdF1swqE">PipingDesign@yahoogroups.com</a>
> Date: zondag 21 december 2003 15:31:59
> To: <a href="/group/PipingDesign/post?postID=x0l9VsOlABv0LeFoalk0SAmDKfYXoSz2SeVQo6ORZtA2YiXnN-201uEphAjsN-AtX78sJDdgT3P3eiNG84Gmu81Yth4">pipingdesign@yahoogroups.com</a>
> Subject: [PipingDesign] surge question
>
> Hi
>
> I am working as Design engineer in a consultant
> engineers, I am modeling a waste water pump station
> the flow rate is about 1.86 cu meter per sec. for
> surge analysis I assumed that all 3 pumps will
> tripped
> and from the down and up surge analysis , I find out
> that a 55 cubic meter tank is enough to surge
> shaving,
> from the software I got that around 5 to 6 min
> needed
> to eliminated all the surge effects but my colleague
> who has 18 years experiences says that just 5 sec
> needed can any body help me ?(the whole net is
> around
> 2.5 km). also for restarting I got from the software
> that 1 pump restarting is most critical from 3 pumps
> restarting (although I know that it is impossible to
> restart all 3 pumps together). Does it make sense?
>
> Best regards
>
> Omid
>
>
>
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Received on Mon Dec 22 06:01:00 2003