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Discharge Dampeners, Suction Dampeners, Oilfield Equipment/ Supplies/ Spare Parts, Oilfield Tools, and Production Equipment.
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Pulsation Dampeners: A pulsation dampener does not have to be as large in cu. in. displacement as the total volume of a reciprocating pump. The only purpose for the dampener is to absorb the small amount of extra fluid pumped through the discharge line due to irregular movement of the pistons. This is caused by each piston having to stop and start at each end of the stroke, and traveling faster at the center of a stroke than at any other point. With pre-charged dampeners it is a common belief that a Pulsation Dampener must be pre-loaded at 50% or more of the working pressure. If this were true, then whenever the working pressure changed the pre-load pressure would have to be changed to suit. Actually, the pre-load pressure only changes the position of the diaphragm or bladder within the dampener.
Shock Arrestors: In our design, the diaphragm or bladder has the same effective surface area at a low line pressure as at a high discharge pressure. For example, in our diaphragm series Shock Arrestors, the diaphragm is toward the lower portion of the housing at low line pressure and approaches the top at high discharge pressure. Rubber will not stretch or shrink if an equal pressure is exerted on both sides of the diaphragm or bladder. Therefore, regardless of pressure variation we still have the same effective surface area operating to absorb high peaks of an incompressible fluid and to discharge into the low pressure peaks, caused by the irregular pressure of a pump, or quick closing valves. This enables the fluid flow beyond the dampener to move at a constant velocity.
Cavitation Eliminators: The suction side of a reciprocating pump is also affected by the piston when it pulls the fluid behind it to fill the cylinder for the next pressure stroke. For, example on a long suction line this sudden movement of the inelastic fluid must change the fluid velocity through the entire length of the suction in order to keep up with the piston. Normally this is impossible due to the inability of the fluid to make this sudden velocity change. A cavitation problem results because the cylinder in not completely filled with fluid when the pressure stroke takes place, creating a distinct shock. Therefore, a Cavitation Eliminator properly pre-loaded and applied to the pump acts as an accumulator to fill the void created by a pump in its suction stroke. The Cavitation Eliminator allows the fluid to move at a constant velocity to the pump by feeding the pump that extra amount of fluid needed to fill the cylinder and make it 100% efficient. The volume and pre-load is more critical on the suction side than on the discharge depending on the suction line pressure. Whenever a zero psi, or even a minus psi exists, a partial vacuum must be created on the Cavitation Eliminator in order to pull sufficient fluid into the accumulator, to feed the cylinders when required.
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