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Pulsation Dampeners at Elevated Pressures Pre-Filling Pulsation Dampeners at Elevated Pressures Pulsation Dampeners at Elevated Pressures

To reduce the overall cost of a pulsation dampener + pre-filling equipment in the range of 2,000 psi (140 Bar) up to
10,000 psi (690 Bar), it is often less expensive to oversize the dampener. For example, from a readily available nitrogen bottle at 2,000 psi in the summer, or 1,900 psi in the winter; for use in a 9,500 psi (650 Bar) system - You can oversize by the ratio of 1,900 to 9,500 psi, I.E. 5:1, make the dampener 5x larger. When your system reaches 9500 the nitrogen will be 20% of its starting volume, but as the dampener is 500% oversized, you will have the smoothness specified, but you will not need a gas intensifier pump as shown below. ABOVE 10,000 psi the method shown below is almost essential.

High pressure nitrogen fill valve – customer to specify Autoclave 20SC4072 1/4" heavy wall tube, 20,000psi series. Gauge complete with check and vent Nitrogen intensifier pump - Autoclave engineers “Maximator” DLE 75-1 Tescom Regulator - part number 44-1100 or alternate “Veriflo” HPR-302-B-46 Bull nose nipple nitrogen bottle thread Regulator - pressure reducing valve Cylinder valve – if you have multiple use for pressurized nitrogen, a gas intensifier enables cylinders to be fully used / pumped “dry”. This is a saving that will help amortize the capital investment. Also reducing cylinder rental charges. As ultra pressure hose is less safe than heavy wall stainless steel tube but tube is stiff, keep length at 3 meters (10ft) and not more than 3/8” (10mm) OD. Connect the liquid side of the dampener to the pipework, but do NOT pump liquid. Open the cylinder valve, and follow the intensifier manufacturer’s instruction. If you have a regulator, set the outlet pressure to the required pre-fill pressure divided by the intensifier ratio. “A” “Required pre-fill pressure” is 80% of theoretical steady state liquid pumping pressure, for flow fluctuation smoothing, or 50% for pressure pulse interception. When your pre-fill pressure is reached, pause for the low temperature of nitrogen expansion, to warm back up. Vent the excess. Close the high pressure nitrogen fill valve. Plug the valve tube connection. Never run with anything more connected!

NOTE: The undercarriage "shock struts" of aircraft, are filled from 6000 psi nitrogen cylinders, as are BOP accs on oil rigs, so high pressure nitrogen does exit.
THE EQUIPMENT PART NUMBERS AND SOURCES NOTED ABOVE ARE WHAT WE USE IN OUR SHOP. WE HAVE FOUND THEM TO BE SATISFACTORY, BUT AS THEY ARE NOT PRODUCED UNDER OUR QA SYSTEM, WE DO NOT WARRANT THEIR SAFETY OR LIFE.

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