Determining exactly equations for piping system
Determining exactly equations for piping system
(OP)
Dear Coleagues:
It is my first time in this forum, I'm a begginer in this field but I need , due to job requirements, to clarify a doubt in order to establish equation for piping (with accessories as bends, elbows, etc).
In my proper special case, I've a piping just at pump discharge zone that goes up to 5 meters in order to avoid an obstacle (it must to pass through a plant roof) and after, it must goes down up to reach same height of outlet zone of pump, the rest of piping system has to be instaled at same heigh, it is to said with geometrical difference equals to cero.
How I must consider this hill and fall just at discharge point? If I apply bernoulli equation, the altitude difference (between hill and after, fall) will not appear, nevertheless, the pump must be able to generate the suitable Head. Please, could you help in this point advising me how I must to proceed?.
Thanks in advance and sorry for caused disturbs
Luike
It is my first time in this forum, I'm a begginer in this field but I need , due to job requirements, to clarify a doubt in order to establish equation for piping (with accessories as bends, elbows, etc).
In my proper special case, I've a piping just at pump discharge zone that goes up to 5 meters in order to avoid an obstacle (it must to pass through a plant roof) and after, it must goes down up to reach same height of outlet zone of pump, the rest of piping system has to be instaled at same heigh, it is to said with geometrical difference equals to cero.
How I must consider this hill and fall just at discharge point? If I apply bernoulli equation, the altitude difference (between hill and after, fall) will not appear, nevertheless, the pump must be able to generate the suitable Head. Please, could you help in this point advising me how I must to proceed?.
Thanks in advance and sorry for caused disturbs
Luike





RE: Determining exactly equations for piping system
Best regards
Morten
RE: Determining exactly equations for piping system
RE: Determining exactly equations for piping system
RE: Determining exactly equations for piping system
Patricia Lougheed
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RE: Determining exactly equations for piping system
Katmar Software
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RE: Determining exactly equations for piping system
Probably, I must explain better the situation, we are talking about a piping sistem for to distribute R-134a refrigerant from a storage tank until the distribution points that are distant to about 50 ms.
The tank has a pipe that goes until the pump, this one impels refrigerant until a height of 5 meters, just avoiding a roof of an industrial ship and returning to descend 5 meters such, from here to the distribution points piping will be installed on same horizontal plane.
I understand that, if the pipe remains full, there would not be problem since the pump simply would impel the liquid in the horizontal and the head delta z would be equal to zero.
But it is not recommendable to place a vent valve since there are severe environmental restrictions with respect to coolants of this type.
So, if I assume that I have this situation, for to perform hydraulic calculations (determining pipe system equation) I must consider a delta z = 5 meters?
Thanks for your best efforts
Luike
RE: Determining exactly equations for piping system
RE: Determining exactly equations for piping system
http://virtualpipeline.spaces.msn.com
RE: Determining exactly equations for piping system
The pressure at any point in a liquid can be thought of as being caused by a vertical column of the liquid which, due to its weight, exerts a pressure equal to the pressure at the point in question. The height of this column is called the static head and is expressed in terms of feet of liquid.
The static head corresponding to any specific pressure is dependent upon the weight of the liquid according to the following formula.
HEAD IN FEET= PRESSURE IN PSI X2.31/SPECIFIC GRAFITY
Centrifugal pump imparts velocity to liquid. This velocity energy is transformed into pressure energy as the liquid leaves the pump, the head developed is equal to the velocity energy at the impeller This relationship is expressed by the following formula:
H=V SQUARE /2g
H = Total head developed in feet.
v = Velocity at periphery of impeller in feet per sec.
g = 32.2 Feet/Sec2
You need to calculate the following
Total Static Head, Friction Head (hf)and Velocity Head (hv),
You need to show all different levels of your piping system, preferred to be in isometric drawing to have a clear picture about you piping system behavior.
ZUHAIR ABOL-OLA
RE: Determining exactly equations for piping system
If your flow rate is greater than that, and the pressure at the top is more than the vapor pressure then the static head is zero and you only have to account for friction losses. If either is not true then you have to account for the pump head to get out of the building.
David