The impact of high inlet pressure on the operation of a plunger pump
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Today, while conducting a hydraulic test on the plunger pump, the normal inlet pressure for such pumps is 0.2 megapascals. Today, this pressure was not properly controlled, and it reached 0.8 megapascals; this increase was not detected in time. The pump’s performance remained normal. Later, one of the technicians said that too high an inlet pressure could damage the diaphragm. I was surprised by this, as I thought a high inlet pressure should have no effect on the pump. Why would they say that? Do people think that high import pressure will have an impact on pumps?\ud83d\ude0a
This post was last edited by 3983596_FPPZ on 2018-12-25 14:22. What is the diaphragm on a piston pump? Plunger diaphragm pump?
I don’t think so; after the mushroom head comes hydraulic oil and pistons, and even under high force, it’s not possible to cause the hose to deform significantly.\ud83d\ude04
Under normal circumstances, there’s no problem. The diaphragm pumps produced by our company are used at Dongying Sinopec Shenghua to handle liquid carbon dioxide at a pressure of 2 MPa, and they’ve been in use for five or six years without any issues at all! Don’t worry, they’re just trying to scare you. Hehe
Generally, there’s no major issue. Those with diaphragms are plunger hydraulic diaphragm metering pumps; whether the diaphragm will get damaged depends on the operating conditions of the pump.
The diaphragm can withstand a pressure higher than the outlet pressure; the inlet pressure has no impact on this
I understand that a low pressure in the plunger pump housing, along with high inlet pressure, can damage the bearing seals. I was thinking – since the oil discharge pressure of plunger pumps is relatively low, could the inlet pressure affect the flow at the oil discharge port? (After all, in many cases oil leakage occurs in the fuel tank.)
The higher the inlet pressure, the greater the impact, which is related to whether the hydraulic system uses micro-volume oil replenishment or fixed-volume circulation. Since the hydraulic system requires lubrication, there must be a return flow of lubricant. The process of supplying a small amount of oil involves creating a certain vacuum at the inlet; when the pressure at the inlet is high, the volume of the oil chamber decreases, causing the diaphragm to reach its limit of movement and eventually break ； The quantitative circulation version can handle higher inlet pressures; you can ask ProMinent about this, as some of their hydraulic diaphragm pump models feature quantitative circulation of hydraulic oil.