I saw that the ammonia compressor has a high-pressure and a low-pressure oil pump – what is the purpose of these pumps?
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This post was last edited by ynjh on 2009-10-28 at 20:28. 1.1. Overview 1.1.1. This hydraulic assembly and disassembly tool is used for installing and removing coupling components. 1.1.2. Hydraulic installation and removal tools come in two types: Type A (Figure 1) and Type B (Figure 2). 1.1.3. The thickness of the positioning ring⑶ determines the axial movement position of part number⑴ after pressurization. Its installation location is as shown in the figure. 1.1.4. When the thickness of the positioning ring (3) using Type B mounting/dismounting tools does not match the axial movement distance required for the workpiece per the design, a positioning ring such as that of Type A mounting/dismounting tools should also be used. At this point, the positioning ring of type B is no longer needed. 1.1.5. 1.2. Installation of the workpiece 1.2.1. Thoroughly remove burrs from the workpiece (couplings, thrust discs, etc.), and carefully clean the workpiece as well as the tools used for installation and removal; there should be no dust, sand particles, metal shavings, or other contaminants. 1.2.2. First, install part number 1 of the tool, then screw the threaded connector of workpiece 2 into the corresponding component on the shaft end. 1.2.3. Screw the fuel supply nozzle of the high-pressure oil pump into the screw hole at the shaft end. 1.3. Connect the oil pipes between the high-pressure oil pump, the low-pressure oil pump, and the tool respectively. 1.3.1. When using Type B assembly and disassembly tools with its positioning ring (3) to determine the axial position, the distance S between the bolt and nut of part number (4) and part number (2) should be adjusted to equal the thickness of part (3). (If part number ⑶ of type A is used for positioning instead of type B’s part number ⑶, the distance S should be greater than the thickness of part number ⑶ of type A.) 1.3.2. A dial indicator is installed on the end face of the workpiece, so as to detect the position of the axial movement of the workpiece during operation. 1.4. Pressurization and depressurization 1.4.1. Pressurization 1.4.2. The high-pressure oil pump is used for expanding the workpiece, while the low-pressure oil pump is used to drive the workpiece to move axially. 1.4.3. First pressurize with a high-pressure oil pump, then pressurize with a low-pressure oil pump ； Operate them alternately. During this process, it is necessary to pay attention to the changes in the dial indicator readings in order to detect the distance the workpiece has moved. 1.4.4. When the workpiece moves axially and the workpiece (or the tool used for installation/removal) comes into contact with the pre-set positioning ring, the workpiece is placed in the correct position. 1.4.5. If air is detected in the oil circuit system during the pressurization process, the connections can be loosened to release the gas. 1.4.6. Release pressure. 1.4.7. Pressure can be released only after confirming that the workpiece has been installed in the correct position. 1.4.8. First, slowly depressurize the high-pressure oil system. When the pointer of the high-pressure gauge returns to zero, waiting for 3–4 minutes indicates that the high-pressure oil system has been depressurized. 1.4.9. After the high-pressure oil has been depressurized, then proceed with the depressurization of the low-pressure oil system. At this time, it is necessary to carefully observe the changes in the dial indicator readings on the working surface. 1.5. Disassembly of the workpiece 1.5.1. When it is necessary to remove workpieces such as couplings or thrust discs from the rotor, the installation and removal tools must first be attached to the rotor in accordance with the steps described in Section 2 of this document. 1.5.2. The workpiece can be removed without the need to use a dial indicator. 1.5.3. When installing or removing the tools, leave a gap of 2–3 millimeters between parts 1 and 2, so that the workpiece can be taken back to its original installation position after being removed. 1.5.4. During the disassembly process, high-pressure oil is used to apply pressure gradually, causing the inner hole of the workpiece to expand slowly; once there is no interference between the inner hole and the shaft, the workpiece can be removed. 1.5.5. The workpiece is not required by the low-pressure oil pump during the disassembly process. I saw the drawings of the ammonia compressor; there are high-pressure and low-pressure oil pumps – what is the purpose of these?
Is the low-pressure one lubricating oil, and is the high-pressure one sealant oil?: dizzy:
That is a special oil pump designed for installation and removal by others; it has nothing to do with ammonia compressors. If you really want to know, ask the person in charge of maintenance, or copy down the device’s label and then search for it on Baidu or Google.
Ammonia synthesis compressors are generally referred to as hydrogen-nitrogen compressors. For reciprocating compressors, the areas that require lubrication are the crankcase and the piston head box; since these areas are at atmospheric pressure, low-pressure oil pumps are used； Lubrication and cooling are required for the seals where pistons are present. Due to the high maximum delivery pressure in the cylinder, which reaches 32 MPa, a high-pressure oil pump, also known as an injection pump, is used.
The original poster’s title has misled everyone; the text description only refers to the oil pump that is part of the specialized tool set used for assembling and disassembling the coupling’s backup wheel. That’s right, there are two oil pumps: one is used to expand the back wheel (at relatively high pressure), and the other is used to move the back wheel axially. This oil pump is very small; it is a manual piston pump whose filling medium is oil. The functions of the oil in an ammonia compressor are: lubrication, control, and sealing. The relative pressure of the control oil is slightly high. Since the operating pressure of ammonia compressors is not high, oil pumps generally do not come in high-pressure and low-pressure versions. As long as a screw pump is used, pressure regulation at the outlet can enable the oil to serve different functions. Now, dry gas seals are used more often, so a seal oil system is no longer necessary. If a floating ring seal is used in the syngas compressor, the high (sealing) and low (lubrication, control) pressure oil systems need to be separated due to the high sealing pressure.