I'm sure someone will...
Bbut only if you supply more information.
What is flowing in the pipe? what sort of volume?what pipe material?How long is the pipe.
What do you mean by 'best' ? Cheapest? Most cost effective? Least resistance to flow?

Not my field, but some of the guys here are good...
but I don't think any are psychic.
Del

maximum permissible head loss

temperature, pressure,

Type of pipe - Seamless, ERW, ...

Only straight pipe or there are obstructions too - elbows, tees, valves, Orifices, Nozzles, reducers,...

(To be simple aim for somewhere around 5 fps for oil(unless it is viscous)/water, or may be less, for Air it may be as high as 50-100 fps)

As per API14 E, acceptable erosional flow velocity are

V = C1 / √(density)

V in fps, density in lb/ft³

Costant C1 = 135 (CS), 186 (SS), 236 (Duplex) , if no data is available, recommended value is 100

However these are the absolute maximum and are usually not aimed at (and it is erosive flow, the head loss etc are not taken into account)

Limit the velocity to 3m/s for liquid and 10 m/s for gases.

If it is less than a third of these figures, it is too large.

If it is more than these figures, it is too small.

Thanks a lot dude . Got it.

Let us use a proper language please

For general pumping of clear water, at around 5-10 dgC , with no special conditions or requirements, the norm is a flow velocity of 1.5 m/s to 2.5 m/s. Make several sample calculations, like for 1.5 m/s... 2 m/s... 2.5 m/s. You can even check 3 m/s. These calculations will show clearly the BOP (best operating point) in terms of cost of materials and energy demand and so dictate the choice of best pipe diam and the size of your pump and motor. Note also that these calculations MUST include ALL friction losses, which even includes the interior smoothness of your pipe walls.... your suction or suction head conditions,(- or +,) available and required NPSH and so forth.

in addition to all of the above recommendations use graphs are available for selecting pipe size flow rates against friction loss check the same

crm

From Tim Hawley Master Mech.

Hello creativegoot,

For the high flow rate you desire, bigger will be better.

To maximize volumetric flow efficiency read below to help understand flow and cylindrical size requirements. Oil or fluid Viscosity plays an important role in flow rate as well.

Volumetric efficiency in internal combustion engine design refers to the efficiency with which the engine can move the charge into and out of the cylinders. More specifically, volumetric efficiency is a ratio (or percentage) of what quantity of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions. Therefore, those engines that can create higher induction manifold pressures - above ambient - will have efficiencies greater than 100%. Volumetric efficiencies can be improved in a number of ways, but most notably the size of the valve openings compared to the volume of the cylinder and streamlining the ports. Engines with higher volumetric efficiency will generally be able to run at higher speeds (commonly measured in RPM) and produce more overall power due to less parasitic power loss moving air in and out of the engine.

There are several standard ways to improve volumetric efficiency. A common approach for manufacturers is to use larger valves or multiple valves. Larger valves increase flow but weigh more. Multi-valve engines combine two or more smaller valves with areas greater than a single, large valve while having less weight. Carefully streamlining the ports increases flow capability. This is referred to as Porting and is done with the aid of an air flow bench for testing.

Many high performance cars use carefully arranged air intakes and tuned exhaust systems to push air into and out of the cylinders, making use of the resonance of the system. Two-stroke engines take this concept even further with expansion chambers that return the escaping air-fuel mixture back to the cylinder. A more modern technique, variable valve timing, attempts to address changes in volumetric efficiency with changes in speed of the engine: at higher speeds the engine needs the valves open for a greater percentage of the cycle time to move the charge in and out of the engine.

Volumetric efficiencies above 100% can be reached by using forced induction such as supercharging or turbocharging. With proper tuning, volumetric efficiencies above 100% can also be reached by naturally-aspirated engines. The limit for naturally-aspirated engines is about 137%^[1]; these engines are typically of a DOHC layout with four valves per cylinder.

More "radical" solutions include the sleeve valve design, in which the valves are replaced outright with a rotating sleeve around the piston, or alternately a rotating sleeve under the cylinder head. In this system the ports can be as large as necessary, up to that of the entire cylinder wall. However there is a practical upper limit due to the strength of the sleeve, at larger sizes the pressure inside the cylinder can "pop" the sleeve if the port is too large.

Volumetric Efficiency is frequently abbreviated as "VE" when discussing engine efficiency.

Volumetric efficiency in a hydraulic pump refers to the percentage of actual fluid flow out of the pump compared to the flow out of the pump without leakage. In other words, if the flow out of a 100cc pump is 92cc (per revolution), then the volumetric efficiency is 92%. The volumetric efficiency will change with the pressure and speed a pump is operated at, therefore when comparing volumetric efficiencies, the pressure and speed information must be available. When a single number is given for volumetric efficiency, it will typically be at the rated pressure and speed.

Cylinder (geometry)

Jump to: navigation, search A right circular cylinder

A cylinder is one of the most basic curvilinear geometric shapes, the surface formed by the points at a fixed distance from a given straight line, the axis of the cylinder. The solid enclosed by this surface and by two planes perpendicular to the axis is also called a cylinder. The surface area and the volume of a cylinder have been known since deep antiquity.

In differential geometry, a cylinder is defined more broadly as any ruled surface spanned by a one-parameter family of parallel lines. A cylinder whose cross section is an ellipse, parabola, or hyperbola is called an elliptic cylinder, parabolic cylinder, or hyperbolic cylinder.

[edit] Common usage

In common usage, a cylinder is taken to mean a finite section of a right circular cylinder with its ends closed to form two circular surfaces, as in the figure (right). If the cylinder has a radius r and length (height) h, then its volume is given by:

and its surface area is:

• the area of the top +
• the area of the bottom +
• the area of the side .

Therefore without the top or bottom (lateral area), the surface area is

With the top and bottom, the surface area is

For a given volume, the cylinder with the smallest surface area has h = 2r. For a given surface area, the cylinder with the largest volume has h = 2r, i.e. the cylinder fits in a cube (height = diameter.)

[edit] Volume

Having a right circular cylinder with a height h units and a base of radius r units with the coordinate axes chosen so that the origin is at the center of one base and the height is measured along the positive x-axis. A plane section at a distance of x units from the origin has an area of A(x) square units where

A(x) = πr²

or

A(y) = πr²

An element of volume, is a right cylinder of base area A(w_i) square units and a thickness of Δ_ix units. Thus if V cubic units is the volume of the right circular cylinder, by Riemann sums,

[edit] Cylindric section

Cylindric sections are the intersections of cylinders with planes. Although these mostly yield ellipses (or circles), a degenerate case of two parallel lines, known as a ribbon, can also be produced, and it is also possible for there to be no intersection at all.^[1]

[edit] Other types of cylinders

An elliptic cylinder

An elliptic cylinder, or cylindroid, is a quadric surface, with the following equation in Cartesian coordinates:

This equation is for an elliptic cylinder, a generalization of the ordinary, circular cylinder (a = b). Even more general is the generalized cylinder: the cross-section can be any curve.

The cylinder is a degenerate quadric because at least one of the coordinates (in this case z) does not appear in the equation.

An oblique cylinder has the top and bottom surfaces displaced from one another.

There are other more unusual types of cylinders. These are the imaginary elliptic cylinders:

the hyperbolic cylinder:

and the parabolic cylinder:

Check Wikipedia: Diameter Vs Flow for additional information

Best Regards,

Tim

it depends on application (pressure line, return line or gravity flow etc), fluid type, acceptable pressure loss in the pipe line.

From Tim Hawley Master Mech.

Hello creativegoot,

As you can see from my # 9 response we can help you do the math we need more application information...........

Regards, Tim

See Cranes Flow of Fluids or Camerom's Hydraulics. Both contain tables and full calculations plus examples. Kinda like a GPS for pipe sizing.