pulsation dampener triplex mud pump free sample

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A properly serviced pulsation dampener is critical for your mud pumps’ efficiency, safety, and performance. Unfortunately, there aren’t many resources available to educate personnel on executing safe and effective servicing procedures. Please review the following steps with your personnel for safe pulsation dampener maintenance.

Should you or your personnel have any questions regarding pulsation dampener maintenance, please don’t hesitate to ask. Sigma is more than happy to help you to ensure safe and proper care is being completed on your pulsation dampening equipment.

Alibaba.com offers 152 pulsation dampener for mud pump products. About 53% % of these are mud pump, 12%% are pumps, and 2%% are other oil field equipments.

A wide variety of pulsation dampener for mud pump options are available to you, such as 1 year, not available and 2 years.You can also choose from new, pulsation dampener for mud pump,As well as from energy & mining, construction works , and machinery repair shops. and whether pulsation dampener for mud pump is 1.5 years, 6 months, or unavailable.

A wide variety of triplex mud pump pulsation dampener options are available to you, such as 1 year, not available and 2 years.You can also choose from new, triplex mud pump pulsation dampener,As well as from energy & mining, construction works , and machinery repair shops. and whether triplex mud pump pulsation dampener is 1.5 years, 6 months, or unavailable.

This equipment plays an important role as an accessory to Yamada air-operated double diaphragm pumps. The pulsation dampener serves to reduce pulsation produced in operation and to assure stable discharge flow and pressure.

When pulsations occur with pump operation, it will result in the pressure in Chamber Bbeing greater than that in Chamber A. The diaphragm will act as an air cushion and automatically adjust to this pressure change and absorb the pulsations.

This operation will shift the center rod position upwards and allow more air in Chamber Athrough the air inlet, returning the diaphragm to a neutral position. If liquid pressure decreases, air pressure in Chamber Acauses the diaphragm to move downward, shifting shaft location and changing valve position, releasing excess air pressure in Chamber Awhich returns diaphragm to a neutral position. This action causes a reduction in surges and pulsation caused by a air operated double diaphragm pumps

Since the NOV A1700-PT Triplex Mud Pump was built approximately 60 years ago, the industry has widely accepted the three cylinder or triplex style pump. Triplex mud pumps are manufactured worldwide, and many companies have emulated the original design and developed an improved form of the triplex pump in the past decade.

NOV A1700-PT Triplex Mud Pumps have many advantages they weight 30% less than a duplex of equal horsepower or kilowatts. The lighter weight parts are easier to handle and therefore easier to maintain. The other advantages include;They cost less to operate

One of the more important advantages of triplex over duplex pumps, is that they can move large volumes of mud at the higher pressure is required for modern deep hole drilling.

NOV A1700-PT Triplex Mud Pump is gradually phasing out duplex units. In a triplex pump, the pistons discharge mud only when they move forward in the liner. Then, when they moved back they draw in mud on the same side of the piston. Because of this, they are also called “single acting.” Single acting triplex pumps, pump mud at a relatively high speeds. NOV A1700-PT Triplex Mud Pump has three pistons each moving in its own liner. It also has three intake valves and three discharge valves. It also has a pulsation dampener in the discharge line.

If you run a mud rig, you have probably figured out that the mud pump is the heart of the rig. Without it, drilling stops. Keeping your pump in good shape is key to productivity. There are some tricks I have learned over the years to keeping a pump running well.

First, you need a baseline to know how well your pump is doing. When it’s freshly rebuilt, it will be at the top efficiency. An easy way to establish this efficiency is to pump through an orifice at a known rate with a known fluid. When I rig up, I hook my water truck to my pump and pump through my mixing hopper at idle. My hopper has a ½-inch nozzle in it, so at idle I see about 80 psi on the pump when it’s fresh. Since I’m pumping clear water at a known rate, I do this on every job.

As time goes on and I drill more hole, and the pump wears, I start seeing a decrease in my initial pressure — 75, then 70, then 65, etc. This tells me I better order parts. Funny thing is, I don’t usually notice it when drilling. After all, I am running it a lot faster, and it’s hard to tell the difference in a few gallons a minute until it really goes south. This method has saved me quite a bit on parts over the years. When the swabs wear they start to leak. This bypass pushes mud around the swab, against the liners, greatly accelerating wear. By changing the swab at the first sign of bypass, I am able to get at least three sets of swabs before I have to change liners. This saves money.

Before I figured this out, I would sometimes have to run swabs to complete failure. (I was just a hand then, so it wasn’t my rig.) When I tore the pump down to put in swabs, lo-and-behold, the liners were cut so badly that they had to be changed too. That is false economy. Clean mud helps too. A desander will pay for itself in pump parts quicker than you think, and make a better hole to boot. Pump rods and packing last longer if they are washed and lubricated. In the oilfield, we use a petroleum-based lube, but that it not a good idea in the water well business. I generally use water and dish soap. Sometimes it tends to foam too much, so I add a few tablets of an over the counter, anti-gas product, like Di-Gel or Gas-Ex, to cut the foaming.

Maintenance on the gear end of your pump is important, too. Maintenance is WAY cheaper than repair. The first, and most important, thing is clean oil. On a duplex pump, there is a packing gland called an oil-stop on the gear end of the rod. This is often overlooked because the pump pumps just as well with a bad oil-stop. But as soon as the fluid end packing starts leaking, it pumps mud and abrasive sand into the gear end. This is a recipe for disaster. Eventually, all gear ends start knocking. The driller should notice this, and start planning. A lot of times, a driller will change the oil and go to a higher viscosity oil, thinking this will help cushion the knock. Wrong. Most smaller duplex pumps are splash lubricated. Thicker oil does not splash as well, and actually starves the bearings of lubrication and accelerates wear. I use 85W90 in my pumps. A thicker 90W140 weight wears them out a lot quicker. You can improve the “climbing” ability of the oil with an additive, like Lucas, if you want. That seems to help.

Outside the pump, but still an important part of the system, is the pop-off, or pressure relief valve. When you plug the bit, or your brother-in-law closes the discharge valve on a running pump, something has to give. Without a good, tested pop-off, the part that fails will be hard to fix, expensive and probably hurt somebody. Pop-off valve are easily overlooked. If you pump cement through your rig pump, it should be a standard part of the cleanup procedure. Remove the shear pin and wash through the valve. In the old days, these valves were made to use a common nail as the shear pin, but now nails come in so many grades that they are no longer a reliable tool. Rated shear pins are available for this. In no case should you ever run an Allen wrench! They are hardened steel and will hurt somebody or destroy your pump.

One last thing that helps pump maintenance is a good pulsation dampener. It should be close to the pump discharge, properly sized and drained after every job. Bet you never thought of that one. If your pump discharge goes straight to the standpipe, when you finish the job your standpipe is still full of fluid. Eventually the pulsation dampener will water-log and become useless. This is hard on the gear end of the pump. Open a valve that drains it at the end of every job. It’ll make your pump run smoother and longer.

A reciprocating power pump, as depicted in Figure 1, is a displacement machine. It has characteristics that are different than a centrifugal pump. Therefore, the system required for a displacement pump is different than that required for a centrifugal pump, and the operating procedures are also different. For instance, it is common practice to start a centrifugal pump against a closed discharge valve. Starting a displacement pump against a closed discharge valve can damage it. Preferably, a displacement pump should start against negligible discharge pressure. Starting a centrifugal against negligible pressure can damage it.

Therefore, to properly select, apply and operate a power pump requires knowledge of its unique characteristics. Some of these characteristics will be presented by stating common myths, misconceptions or misunderstandings and hopefully dispel some of them in the following list. Since some are not really full-blown myths, just misconceptions or misunderstandings, they will be called “MM.”

Power pumps are self priming.As was learned from operators of pressurized-water nuclear power plants, when a power pump ingests a slug of gas while running, one or more pumping chambers can become “vapor-locked” and cannot expel the gas and regain prime. It is necessary to reduce the pump discharge pressure to near (or below) suction pressure to allow the pump to reprime, and if the pump is running at a high speed with the necessary strong valve springs, priming may be more difficult.

If the first power pump chamber becomes primed, the remaining chambers will automatically become primed.If this were a multistage centrifugal pump, the statement would be true because all impellers are in series. However, in a multiplex power pump, the plungers (pumping chambers) are in parallel, so one chamber can become primed while the other chambers remain “vapor-locked.”

To prime a power pump, it is necessary to disassemble the liquid end.A project engineer once told me that, when starting a new processing plant containing new power pumps, to prime each pump, he would remove each discharge valve cover, remove each discharge valve, fill each pumping chamber with liquid and then reassemble the pump. He was pleased to learn that this laborious process was unnecessary. If the design of the system allows the operator to start the pump against negligible discharge pressure, most power pumps will prime all pumping chambers. Disassembly is not required.

If the pump is driven by a variable speed driver, a bypass line is not required.As discussed above, priming a power pump requires reducing the discharge pressure to near suction pressure, and this is typically accomplished by opening a valve in a bypass line, which connects back to the suction vessel. Such a line is illustrated in Figure 2. A variable speed driver does not eliminate the need for a bypass line.

The motor driver for a power pump needs to have a high starting torque.This misconception arises from the difficulty experienced when starting a power pump against a high discharge pressure. For many reasons, the pump should be started against negligible discharge pressure. The requirement for a high starting torque driver is thus eliminated.

A power pump can be run backward satisfactorily.Although the liquid end will pump the same regardless of the direction of the crankshaft rotation, running a power pump backward can result in a hot power end, power end knocking, reduced lubrication to the crossheads and bearings, and shorter packing life because of the resulting oscillations of the plungers.

Small, high-speed pumps produce lower pulsations than large, low-speed pumps.It has been stated that a smaller pump, running faster, for the same capacity, will produce less pulsation in the suction and discharge piping. That is not true because, as seen in Figure 3, the liquid velocity variation produced by a triplex pump, for example, is typically 25 percent of the average velocity, whether the pump is large or small, running fast or slow. The acceleration of the liquid in the piping, being the rate of change of velocity, is therefore larger for a small, high-speed pump than for a large, low-speed pump when both pumps have the same capacity and the same size piping.

All power pumps require pulsation dampeners.There are installations, with triplex and quintuplex pumps, that operate satisfactorily without pulsation dampeners. These installations are usually characterized by low-speed pumps and short, large-diameter suction and discharge piping.

A discharge pressure below the pump rated pressure indicates a problem with the pump.Unlike with a centrifugal pump, the discharge pressure of a displacement pump is established by the system. If there is low discharge pressure with a power pump, the cause is probably in the discharge system.

Power pumps can handle significant quantities of air or other gases.This one can really be trouble. Even small quantities of free gas flowing into a power pump will shorten the lives of numerous pump components. The higher the discharge pressure, the more damaging is the gas.

The check valves in power pumps are pushed closed by the reverse flow of the pumpage.It is the function of the valve spring to push the valve to near-closed as the plunger reaches the end of its stroke. Higher speeds require stronger springs. If the spring is not strong enough, the valve will be too far from the seat at the end of the stroke and will be slammed onto the seat by the reverse flow of the pumpage. Such action results in a noisy, rough-running pump and shaking pipes.

All power pumps require at least 10 psi of NPSH.Power pumps, when operated near their top rated speeds, require strong valve springs to obtain smooth operation. It is typical for such pumps to require 10 psi, or more, of net positive suction head (NPSH). However, if the pump speed is reduced to a value below about 200 rpm, the springs on vertical suction valves can be removed, and the net positive suction head required (NPSHR) will drop to about 1 psi (less than many centrifugal pumps).

A high suction pressure requires strong suction valve springs.This initially sounds reasonable, but further examination reveals otherwise. A check valve in a power pump is pushed open by the differential pressure of the pumpage. A suction valve is therefore opened by the difference between the suction pressure and the pressure in the pumping chamber. As the plunger pulls back on the suction stroke, the pressure in the chamber falls. When the pressure falls to a value that is just below suction pressure, the suction valve begins to open. The valve knows not the difference between suction pressure and atmospheric pressure. It knows only the difference between suction pressure and chamber pressure. This principle is illustrated by a low-speed pump, pumping propane, which is provided with an inlet pressure of 150 psia. To minimize NPSHR, the springs are removed from the suction valves. Pump operation is quiet and smooth, and the pump achieves high volumetric efficiency. The pump has a high suction pressure and operates satisfactorily with no springs on the suction valves.

Because the top of the pump valve is larger than the “exposed” bottom of the valve, a significant differential pressure is required to open the valve.Figure 4, taken from an article on power pumps, illustrates this theory. The article stated that a high differential pressure was required to kick the valve open. It may be true that a valve with an elastomeric or soft plastic sealing element exhibits such a characteristic, but an all-metal valve does not require a high differential pressure to kick it open. If it did, we could not have pumps that operate satisfactorily with one psi of net positive suction head available (NPSHA).

The allowable lift of a power pump valve is proportional to its diameter.This concept seems to have originated with Reference 1 and was perpetuated by Reference 2. As revealed in Reference 8, the maximum allowable valve lift for smooth pump operation appears to be solely a function of the rpm of the pump crankshaft. It is independent of valve size.

All power pumps are suitable for slurry service.Don’t believe it. Most power pumps are designed to pump only clean (non-abrasive) fluids. Slurry applications require special valves and stuffing box designs. An entire special fluid end may be required.

If the packing on one plunger fails, the packing on the other plungers is near failure.This is often not true. For multiple reasons, one set of packing in a pump can fail prematurely. The other sets of packing may last weeks or months longer. Because of possible improper installation or startup procedure of replacement packing, changing good packing can actually result in a shorter life. Changing all packing, when one set fails, can also mask a problem with one particular stuffing box—such as misalignment or a scored plunger. If it ain’t broke, don’t fix it.

Wright, Elliott F., “New Developments in Reciprocating Power Pumps,” a paper presented to the 6th meeting of the National Conference on Industrial Hydraulics, 1955.

Henshaw, Terry, “Power Pump Valve Dynamics – A Study of the Velocity and Pressure Distribution in Outward-Flow Bevel-Face and Flat-Face Power Pump Valves,” a technical paper presented at the 25th International Pump Users Symposium, Houston, Texas, 2009.

Henshaw, T., “Think power pumps are self-priming? Think again!” Hydrocarbon Processing Magazine, December 2009. 10. Henshaw, Terry, “Improve Power Pump Performance with Stronger Valve Springs”, Compressor Tech Two, July 2010.

This paper focuses on the operational experience that was gained during field test of the Hex Pump on a land rig in Jasper, Texas in October 2003. This field test showed that the pulsation frequency in the flow from the Hex Pump did not interfere with the MWD-measurements, providing a much cleaner signal to the directional driller. Also, the overall power consumption on the rig was reduced due to use of AC-motors.

A mud pump (sometimes referred to as a mud drilling pump or drilling mud pump), is a reciprocating piston/plunger pump designed to circulate drilling fluid under high pressure (up to 7,500psi or 52,000kPa) down the drill string and back up the annulus. A mud pump is an important part of the equipment used for oil well drilling.