mud pump rpm calculator quotation

Rig pump output, normally in volume per stroke, of mud pumps on the rig is  one of important figures that we really need to know because we will use pump out put figures to calculate many parameters such as bottom up strokes,  wash out depth, tracking drilling fluid, etc. In this post, you will learn how to calculate pump out put for triplex pump and duplex pump in bothOilfield and Metric Unit.

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The shaft power - the power required transferred from the motor to the shaft of the pump - depends on the efficiency of the pump and can be calculated as Ps(kW) = Ph(kW)/ η (3)

When it comes to pumping terminology, one crucial term to know is GPM — a measurement that will help you determine if you’re choosing the right pump. So what is GPM, and how do you calculate it?

GPM stands for gallons per minute and is a measurement of how many gallons a pump can move per minute. It is also referred to as flow rate. GPM is variable based on another measurement known as the Head, which refers to the height the water must reach to get pumped through the system. It is also referred to as flow rate. GPM is variable based on another measurement known as the Head, which refers to the height the water must reach to get pumped through the system.

Pumps are typically measured by their GPM at a certain Head measurement. For example, a pump specification may read 150 GPM at 50 Feet of Head, which means the pump will work at 150 gallons per minute when pumping water at a height of 50 feet.

GPM identifies the unique capabilities of a pump so you can select the right one for your specific needs. If you need a pump for a larger public area such as a golf course, marina or lake, you will need a pump with a much higher GPM than one used for your home’s well. Plus, choosing the correct pump is essential for reducing your costs and increasing your pump’s lifespan.

At GeoForm International, we are a leading manufacturer of high-quality submersible pumps, dredges, digester packages and aerators, all of which are made in the U.S. With our pump expertise, we know just how essential GPM is in the pumping and dredging industry from how much equipment costs to how long jobs will take.

When two (or more) pumps are arranged in serial their resulting pump performance curve is obtained by adding theirheads at the same flow rate as indicated in the figure below.

Centrifugal pumps in series are used to overcome larger system head loss than one pump can handle alone. for two identical pumps in series the head will be twice the head of a single pump at the same flow rate - as indicated with point 2.

With a constant flowrate the combined head moves from 1 to 2 - BUTin practice the combined head and flow rate moves along the system curve to point 3. point 3 is where the system operates with both pumps running

When two or more pumps are arranged in parallel their resulting performance curve is obtained by adding the pumps flow rates at the same head as indicated in the figure below.

Centrifugal pumps in parallel are used to overcome larger volume flows than one pump can handle alone. for two identical pumps in parallel and the head kept constant - the flow rate doubles compared to a single pump as indicated with point 2

Note! In practice the combined head and volume flow moves along the system curve as indicated from 1 to 3. point 3 is where the system operates with both pumps running

In practice, if one of the pumps in parallel or series stops, the operation point moves along the system resistance curve from point 3 to point 1 - the head and flow rate are decreased.

Pump curves are calculated based on water which has an SG of 1. If a fluid has a higher specific gravity than water, then the head will show the same, but the pressure will increase since Pressure is a function relative to fluid calculated by multiplying Head x Specific Gravity.

The pressure supplied by a pump for each application is fluid dependent and relative to fluid density thus pressure will change according to the fluid’s specific gravity

Care must be taken where a pump curve shows a high NPSH is required. A fluid with a low specific gravity, must be checked against the NPSH required carefully.

Cavitation can occur if the inlet pressure is below that required by the pump, which can arise when the SG of the fluid is not accounted for correctly, when determining the NPSH available.

Positive Displacement Pump CurveA PD Pump curve will not be affected in the same way as a centrifugal pump curve by the specific gravity of a fluid, as flow rate will remain constant. However, the absorbed power will increase, with the pressure produced remaining fluid dependent.

According to the procedure of driller’s method, the old mud is pumped into the drillpipe to circulate the kick out of the hole, which occurs in the first circulation. Therefore, the mud in drillpipe and annulus has same properties. To analyze the gas kick rising speed during the circulation, following assumptions are made:1.

There are two mud annuli between gas column and walls of wellbore and drillpipe due to the wettability effect. The thicknesses of these two annuli are very small comparing with the radius of the gas column

For a volume of gas kick, Vg,BH, enters into the bottomhole, the volume of the gas kick equals the difference between the mud flow out of hole and into the hole.

where Vgas kick,BH = volume of gas kick at bottomhole, VM,out = volume of mud flow out the hole, VM,out = volume of mud flow out the hole, VM,in = volume of mud flow into the hole.

Since the time period between well shut in and starting pumping old mud to circulate the kick is very short, we can assume the migration of gas begin as the pump is started up. Now we analyze the rising speed of gas column at the beginning of first circulation. As old mud is pumped into the drillpipe, the gas kick migrates upward inside the annulus like a piston as shown in Fig. 1. At the time the gas kick begins to move upward, the height of gas kick is the sum of heights of cone part and cylinder part, which is expressed as

To estimate the rising velocity of gas kick, force analysis is required. Forces on gas column can be analyzed in two dimensions, horizontal and vertical directions. For the purpose of this study, horizontal forces are not considered. According to the U-tube theory, the pressure inside the drillpipe should be balanced by pressure in the annulus. When the old mud is pumped into the drillpipe, the gas column will move upward along the annulus. The gas column is subjected to five forces, the gravitational force, the drag force on the cone surface of gas column, the drag force on the flank of the gas column, the fluid forces in front of and behind the gas column. Because the forces in the vertical direction control the upward movement of gas kick, they are analyzed here. The net force in vertical direction is calculated by

2, can be estimated by Ling’s (2010) method. In Fig. 1, the cone of gas column experiences a drag force resulting from the viscous mud flow around the cone surface. The magnitude of drag force depends on the flow regime, laminar, or turbulent flow. For laminar flow, the drag force is calculated from Stokes law. Stokes law has shown that for creeping flow (Castleman 1926), the drag force is related to the gas cone velocity through the fluid by:

The molecular weight can be calculated from gas-specific gravity. Gas-specific gravity can be calculated from shut-in drillpipe pressure, shut-in casing pressure, mud density, and pit gain, or from offset well gas property. Bottomhole temperature and temperature at any depth can be estimated using regional temperature gradient. Gravity force of gas column is constant during the gas migration.

NOTE: Max RPM in the above equation varies according to type of pump, size of stroke, and other variables. Duplex pumps often run about 100 RPM Max. while triplex pumps will run somewhere between 100 RPM Max and 400 RPM Max.

I have a reciprocating pump and I know what my max rated rod load is (in foot pounds). I also know what size plunger size my pump has. What PSI will my pump produce?

Specific Gravity is used when sizing a centrifugal pump. Liquids with a specific gravity greater than 1.0 are heavier than water and conversely, liquids with a specific gravity lower than 1.0 are lighter weight than water and will generally float on water.