Equipment inspection and acceptance

Non-destructive testing of casting defects: those that fall under any of the following categories are considered major defects. A. Due to defects, leakage occurs during the hydrostatic test. B. The depth of the pit to be welded and repaired is greater than 20% of the wall thickness or 25 mm. The smaller of the two. C. Any area to be repaired by welding must be larger than 6500 mm2. PS: For welding repairs of major defects in pressure-bearing castings, stress relief, post-weld treatment, and radiographic inspection of the welds are required. Visual inspection and dimensional inspection: All surfaces of pressure castings must undergo visual inspection to ensure that there are no sand inclusions, oxide scales, cracks, hot tears, or other similar manufacturing defects. The machined surface of the takeover flange shall be visually inspected to ensure that there are no harmful defects. The following items shall be inspected in accordance with the drawings and other documents approved by the seller, and the inspection results shall be recorded: (1) The rotation direction of the pump, gear unit, and drive machine. (2) The basic positional dimensions and port dimensions of the main external pipeline connections. (3) Main dimensions of the base and the location of the foot bolts. (4) Layout of auxiliary pipelines (5) All nameplates. Check all operating clearances and make records of them. Hydraulic testing: All pressure-bearing components, including the pump casing, sealing chambers, sealing end plates, cooling jackets, and auxiliary pipelines, shall be subjected to a specified pressure using water or light oil in a hydraulic test. The hydraulic test pressure should be 1.5 times the design pressure, with a holding time of at least 30 minutes. Performance tests and operation tests (1) Performance tests Should be conducted at 10 to 12 different flow rate points, including at least the shut-off point, the minimum continuous stable flow rate point, intermediate points between the minimum continuous stable flow rate point and the rated flow rate, the rated flow rate point, and the 115% of the rated flow rate point. Record the flow rate, head, power, and efficiency for at least the above five points. (2) After the performance test, operational tests are conducted, followed by a mechanical inspection of the pump. Including performance tests, its continuous operation time is usually 1 hour. Mechanical inspections such as vibration, bearing housing temperature, and seal leakage should be carried out after the bearing temperature has stabilized. At the rated speed and rated flow rate, the pump shall meet the allowable tolerances for the performance parameters specified in the standards. The reliability of the seal must be checked during testing; therefore, substitute seals should not be used. Alternative bearings are also not allowed. NPSH test: A NPSH test should be conducted under the following conditions: (1) when (NPSH)a – (NPSH)r ≤ 1 m; (2) when required by the properties of the liquid to be transported. The cavitation margin test should include the following four different flow rates: (1) minimum continuous stable flow rate, (2) medium flow rate, (3) rated flow rate, (4) 115% of the rated flow rate

I. Basis for inspection upon arrival: The basis for inspection upon arrival is the design drawings and related design documents, the order contract, and relevant standards. II. Contents of arrival inspection: The arrival inspection consists of two parts: one is document review, and the other is physical inspection. The equipment, internals, and accessories delivered for installation shall meet the requirements specified in the design documents ； Imported equipment must also meet the requirements of the order contract ； When unpacking the equipment, the relevant personnel should count and inspect the following items in accordance with the packing list, and fill out the equipment unpacking inspection record. (1) Document review: The equipment delivered as a whole should at least have the following documents reviewed: 1) Packing list ； 2) Factory certificate of conformity ； 3) Equipment manual ； A. Equipment characteristics: design pressure, test pressure, design temperature, working medium, vessel category ； B. Preparation of as-built drawings and documents confirming design modifications ； C. List of main components ； D. Thermal treatment status of the equipment and special instructions such as solder prohibition. 4) Quality certificate ； A. List of materials used for the pressure-bearing components of the product (including welding materials), including the name of the pressure-bearing component, part number, materials used (grade, specification, furnace batch number, manufacturer, supply status, material identification upon arrival at the factory), chemical composition, and mechanical properties (including source of data) ； B. Non-destructive testing report for compressed components ； C. Mechanical and bending property test report for product welding test plates ； D. Welding quality inspection certificate (including records of rework due to defects) ； E. Weld non-destructive testing reports (RT, UT, MT, PT) and radiographic film evaluation form ； F. Heat Treatment Inspection Report ； G. Inspection Report on the Appearance and Geometric Dimensions of the Container ； H. Pressure test inspection report. 5) Copy of product nameplate ； 6) Safety and quality supervision and inspection certificate for pressure vessel products (except those not within the scope of pressure vessel supervision and inspection) ； 7) Other technical documents. (2) Physical inspection 1) Counting of quantities. Based on the contract, packing list or receipt note, as well as the drawings, the delivered goods are unpacked and inventoried, with records and signatures made to serve as proof of handover. 2) Visual and geometric dimension quality inspection: Under the organization of the ordering department, the construction/ supervision, and construction units shall conduct a visual quality inspection of the actual equipment and accessories delivered as a whole. The main contents are: A. The inner and outer surfaces of the equipment must be free from defects such as scratches, cracks, bubbles, scars, folds, inclusions, rust, and deformation ； B. The main geometric dimensions of the equipment meet the requirements ； C. The orientation of the pipe outlet meets the requirements of the assembly diagram ； D. The machined surfaces, flange surfaces, and fastener surfaces should be smooth, free of cracks and burrs, with accurate dimensions ； E. The dimensions of the equipment’s internal components shall comply with the drawings and technical requirements. The detachable components within the internals (such as reactors, tray plates in towers, floating valves, etc.) should be inspected and counted together when packed separately, and the flatness of the tray plates should also be checked. Simulated assembly groups should be conducted when necessary. There must be no damage or deformation ； F. The weld scars on the tooling fixtures have been removed ； G. The surface of low-temperature equipment should have no scratches or any type of stamp marks ； H. No damage or iron ion contamination on the surface of equipment made of stainless steel and non-ferrous metals ； I. The device ports are sealed, and the nitrogen filling equipment is in an effective protective state ； J. The orientation marks, centerline marks, center of gravity marks, and lifting points of the equipment shall be clear. 3) When there are doubts about the quality of the equipment, the following retests can be carried out: A. Non-destructive testing of welds ； B. Thickness measurement of the cylinder or other parts ； C. Non-destructive testing of the cylinder surface ； D. Spectral analysis of various materials, metallographic structure inspection, hardness testing, etc. (3) Nameplate inspection: The container must be equipped with a nameplate in a visible location ； The content and format of the nameplate shall comply with the requirements of Appendix 6 to the \"Regulations on Safety Supervision of Pressure Vessels\"; its main contents include: the name of the manufacturing unit and the manufacturing license number ； Manufacturing number of the issuing entity ； Manufacturing date ； Design pressure, maximum allowable operating pressure, test pressure ； Design temperature ； Container weight ； Container category.

Everything mentioned above is comprehensive, but what’s more important are the testing methods

Let’s discuss a few points to keep in mind during acceptance: 1. Multiple-party acceptance: As is well known, the acceptance process is crucial for the quality of a project, and it is also relatively prone to various kinds of improper practices. Therefore, joint inspections carried out by procurement, quality control, construction, and other parties can ensure product quality and reduce the chances of fraudulent behavior. In fact, it’s difficult to have a good team, as well as good managers. This also protects valuable cadre resources. 2. Quantitative inspection: By purchasing various instruments, it is possible to measure important parameters of equipment such as material and dimensions in a convenient and quantitative manner, in an objective and straightforward way. Using a magnet to check stainless steel is a quick method that can be used as a preliminary check, but it is not suitable as a formal inspection method. :) 3. Pay attention to quality control during the manufacturing process: Many devices have internal components, and it is not sufficient to conduct inspections only at the time of delivery. Key points should be controlled during the production process to ensure the internal quality of the equipment! 4. Pay attention to the preparations before inspection: Before conducting an inspection, it is essential to gain a thorough understanding of the equipment to be inspected. If there are many inspectors – not just one or two – who do not even have basic knowledge about the equipment, such as its principles, structure, key dimensions, and main performance characteristics, how can an inspection be carried out?

Tell me about the testing methods? Let’s share it among everyone. . .

For valves, this involves disassembly inspection, pressure testing, and material inspection.

It seems that the on-site acceptance of equipment and the installation acceptance of equipment are both equally strict. It is that the installation and acceptance of the equipment have strict requirements regarding the weld treatment of the welded areas, as well as considerations such as curvature, position, and levelness.

I need to have tests done now as well; I hope experienced experts can offer me some guidance

1. According to the contract, the quantities on the equipment packing list must be counted. 2. Check the appearance for any damage. 3. Make sure to receive the documents properly and keep them safe; it’s best to take photos of the equipment as a record. 4. Make sure to properly store the equipment. 5. The goods should be counted promptly after unboxing. Report any errors promptly. 6. The equipment acceptance process should be extended until the installation and commissioning of the equipment are completed. If a problem is detected, contact the supplier promptly.