I would like to ask those of you who work with equipment: what is the typical air pressure that should be applied to the oil accumulators in lubrication stations?
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I would like to ask those of you who work with equipment: what is the typical air pressure that should be applied to the oil accumulators in lubrication stations? Is it filled with air? What kind of device is generally used for charging? :)
It is recommended to fill it with nitrogen; the pressure does not need to be very high, as long as it meets the usage requirements...
Should it be greater than the lubricating oil pressure? How can we determine whether the requirements are met?
Based on what you’ve said, does the accumulator supply oil to the lubrication station? In this case, the pressure inside the accumulator should be slightly higher than that in the lubricating oil station in order to function properly...
It’s probably the pressure-stabilizing effect that plays a significant role. In our facility’s centrifugal compressor lubrication system, there is an accumulator with a volume of 0.117 m3; it’s of the bladder type, and the test pressure is 2.1 Mpa. This accumulator is installed on the main lubrication supply pipe, where the lubrication pressure in that pipe is 2.8 bar. What I want to know is what pressure should be applied inside the bladder Too high or too low – it definitely means that the original performance has been lost. I’m not sure what pressure is appropriate to use
The test pressure is 2.1 Mpa; the design pressure is approximately 2.1 Mpa / 1.25 = 1.68 Mpa. The operating pressure (equivalent to the airbag pressure) is about 1.5 Mpa, which is significantly higher than the lubricating oil pressure in the fuel supply pipe, which is 2.8 bar. It’s unclear why this design was chosen in the first place...
That’s exactly what I’m wondering about. This is probably a pressure test; normally, the value shouldn’t be that high. If it is that high, then the function of the accumulator will be lost! I wonder what pressure the gas in accumulators that you have seen needs to be charged to?
Is the accumulator always connected to the lubricating oil station? If so, should pipe friction loss be taken into consideration...
The pump outlet pressure is a little over 3 bar; it’s a screw-type pump. After cooling and filtering, there’s an accumulator, and next to it there’s a remote pressure transmitter with a pressure of around 2.8 bar. Further up, there are groups of 3-to-2 remote transmitters at each lubrication point, with pressures of approximately 2.5 bar each. So the pressure drop along the pipes is about 50-60 KPa from start to finish. The function of this accumulator seems to be to stabilize the pressure, right?
5. Determination of inflation pressure: The inflation pressure can be based on the following values: (1) For shock absorption, the common pressure set for the accumulator or a slightly higher pressure can be used as the inflation pressure； (2) Pulsating damping: Use 60% of the average pulsating pressure as the inflation pressure ； (3) Energy storage: The inflation pressure should be set within the range of 90% below the system’s minimum operating pressure (usually 60%-80%) and 25% above the maximum operating pressure ； (4) Thermal expansion compensation: The lowest pressure in the closed loop of the hydraulic system, or a pressure slightly lower than that, is used as the inflation pressure. :) Could you help me figure out whether it means 2.5 bar * 90% = the inflation pressure?
The accumulator installed here serves to stabilize the pressure; we normally set it at *0.7 of the operating pressure.