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Installation methods and requirements for pump units: 1. When the installation of a pump unit involves technical requirements specified for the product itself, it shall be installed in accordance with the provisions in the product’s technical documentation； 2. The pump set can be installed with shims or without shims, depending on the conditions of the equipment ； 3. The axis of the pump shaft should be horizontal, and its elevation must meet the design requirements ； 4. The radial displacement between the pump shaft axis and the motor shaft axis must meet the specified standards ； 5. The sealing parts of the pump must be tight, with no leakage allowed ； 6. The pump must be firmly connected to the base, and the base must be firmly connected to the foundation; there should be no looseness ； 7. When installing the pump body, its orientation in the longitudinal, transverse, and horizontal directions must meet the specified requirements ； 8. The clearance between the impeller and the pump casing must comply with the specifications outlined in the equipment’s technical documents. There should be no sticking or abnormal noises ； 9. Before installing the machine base, place the shims as required. The surface of the foundation at the location where the shims are to be placed (within about 50 mm from the perimeter) shall be scarified; the permissible deviation in levelness is 2 mm/m. The shims should make even contact with the foundation, and the contact area should be no less than 50%. The allowable deviation for the levelness of flat shims is 2 mm/m. The surface of the shim plates should be smooth, without scale, burrs, etc ； 10. When lifting the pump body, attach the slings and rigging according to the lifting point markings specified by the manufacturer. After the pump base is in place, perform preliminary leveling and install the anchor bolts. The unthreaded portion of the anchor bolt should be free of oil and scale; a small amount of grease should be applied to the threads. The anchor bolt must be vertical and not tilted. It should not touch the bottom of the hole, and the distance between any part of the bolt and the hole wall must be at least 15 mm. Once the requirements are met, grout the reserved holes within 24 hours. Before grouting, it is essential to ensure that debris such as gravel and dirt, as well as standing water, are completely removed from the bolt holes. The grouting material should be one grade higher than that of the pump set foundation; H40 grouting material shall be used uniformly, and the grouting process must be carried out continuously. When compacting the concrete in the reserved holes, care must be taken not to skew the anchor bolts or displace the machine. The foot bolt holes can be tightened only when the strength of the grouted concrete reaches over 75% ； 11. After the completion of the initial grouting curing period, level and align the equipment; place one set of shims on each side near the foot bolts, with no more than four layers per set, and the height of the shim sets is generally 30–70 mm. The elevation of the top surface of each shim set should match the actual installation elevation of the machine’s floor. If the distance between shims exceeds 500 mm, additional shims must be added. After the machine is leveled, the shim set should protrude 10–30 mm from the base. For the shims on either side of the foundation bolts, the length of each shim that extends into the ground beneath the machine base should exceed that of the foundation bolt itself, in order to ensure even distribution of the load on the machine base. If the contact width between the bottom surface of the machine base and the shims is insufficient, the shims should be placed in such a way that the base rests in the center of the bearing surface of the shims. The overlap length of the paired shims should be no less than 3/4 of their total length, and the angle of deviation between them should be no more than 3°. After the machine is leveled and aligned using shims, check the tightness of the shim set by tapping it with a 0.25 or 0.5 kg hammer; there should be no looseness. Use a 0.05 mm feeler gauge to check the gaps between the shims as well as between the shims and the base; the total length that can be inserted from both sides at the same cross-section of a shim must not exceed 1/3 of the shim’s length (width). After passing the inspection, perform inter-layer spot welding on both sides of the shims using electric welding to secure them ； 12. During the machine leveling process, the selection of the installation reference and the allowable deviation in levelness must comply with the relevant provisions of the \"special specifications\" or the machine’s technical documentation. The allowable deviation for general lateral levelness is 0.10 mm/m, while the allowable deviation for longitudinal levelness at the installation reference point is 0.05 mm/m. Leveling shall not be adjusted by using adjustable foot bolts (the three-point leveling method is generally used for leveling). 13. The standard measurement points for installation should be selected from the following locations: a. For pumps installed as a whole, the inlet and outlet flanges or other horizontal reference surfaces should be used as the basis ； b. For pumps that are disassembled and reinstalled, use the machined surface of the pump body as the reference ； c. Vertical pumps, referenced to the coupling or motor base ； d. Reciprocating pump, using the machine frame slideway, bearing housing, exposed shaft parts, or other machined surfaces as references ； Allowable installation tolerances for centrifugal pumps used in the chemical industry (in mm) – Item No., Parameter, Allowable Tolerance, Inspection Method: 1. Centerline position: 5; checked using a steel ruler. 2. Elevation: ±5. 3. Levelness of the pump, in both longitudinal and transverse directions: 0.05/1000; checked using a level. For overall installation, the longitudinal levelness should be 0.05/1000, while the transverse levelness should be 0.10/1000. 14. Tighten the foot bolts symmetrically and evenly, leaving 1.5–3 threads exposed. At the same time, check the transverse and longitudinal levelness of the pump body; these values should not change. If they do, adjustments need to be made ； 15. After leveling and alignment are completed, perform secondary grouting using H40 grout for the pump base ； a. Before secondary grouting, remove any debris and oil from the surface of the foundation, and moisten the foundation ； The base surface should be roughened, with the depth of the roughness generally being no less than 10 mm. The density should be 3 to 5 points per square decimeter ； b. The secondary grouting shall be carried out within 24 hours after the concealed works have been inspected and found satisfactory, as well as after the machine has been leveled and aligned; otherwise, the leveling and alignment measurements must be re-measured prior to grouting ； c. Before the secondary grouting, tighten the foot bolts to the required torque. This tightening should be carried out once the concrete in the reserved holes has reached 75% or more of its design strength, and the tightening force must be even ； d. Grouting must be carried out continuously, and the grouting layer must be compacted to fill the bottom of the base. The height of the secondary grouting layer is generally 30–70 mm ； e. The distance between the formwork used for secondary grouting and the outer edge of the equipment should be no less than 60 mm. After the formwork is removed, finishing work must be carried out; the outer surface of the secondary grouting finish layer should be smooth, with a slight outward slope on the upper surface, and its height should be slightly lower than that of the upper surface of the equipment’s support edges ； 16. The alignment of the wheels shall be carried out in accordance with the requirements for rotor shaft alignment specified in Section 5.7 of the SH/T3538-2005 standard.