JB/T 13977-2020 PDF English

JB/T13977-2020 (JBT13977-2020): PDF in English

JB/T 13977-2020 JB MACHINERY INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.080 J 71 Liquefied Natural Gas Cryogenic Submersible Pumps 液化天然气(LNG)低温潜液泵 ISSUED ON: AUGUST 31, 2020 IMPLEMENTED ON: APRIL 01, 2021 Issued by: Ministry of Industry and Information Technology of the People’s Republic of China. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 5 4 Type and Model ... 6 4.1 Type ... 6 4.2 Model ... 6 5 Technical Requirements ... 6 5.1 General ... 6 5.2 Pressure shell ... 8 5.3 Nozzle and pressure shell interface ... 8 5.4 Rotor ... 9 5.5 Wear rings and running clearances ... 9 5.6 Motor ... 11 5.7 Rotor balancing ... 12 5.8 Bearings ... 12 5.9 Lubrication ... 13 5.10 Materials ... 13 5.11 Marking ... 13 6 Junction Box ... 14 7 Inspection and Test ... 14 7.1 Visual inspection ... 14 7.2 Electrical inspection ... 15 7.3 Test ... 15 8 Inspection Rules ... 17 8.1 General ... 17 8.2 Inspection classification ... 17 8.3 Exit-factory inspection ... 18 8.4 Type inspection ... 18 8.5 Sampling ... 18 8.6 Inspection items ... 18 9 Preparation before Delivery ... 19 10 Information of Vendor ... 20 10.1 Drawings and technical data ... 20 10.2 Curves ... 21 Liquefied Natural Gas Cryogenic Submersible Pumps 1 Scope This Standard specifies the terms and definitions, type and model, technical requirements, junction boxes, inspection and test, inspection rules, preparations before delivery, and seller's information of cryogenic submersible pumps for transporting liquefied natural gas (LNG). This Standard applies to submersible centrifugal pumps for transporting liquefied natural gas (LNG) (hereinafter referred to as submersible pumps). 2 Normative References The following documents are essential to the application of this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 191 Packaging – Pictorial marking for handling of goods GB/T 755-2019 Rotating electrical machines - Rating and performance GB/T 1032-2012 Test procedures for three-phase induction motors GB/T 1974 Tangential keys and keyways GB/T 2828.1 Sampling procedures for inspection by attribute – Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3215-2019 Centrifugal pumps for petroleum, petrochemical and natural gas industry GB/T 3216 Rotodynamic pumps – Hydraulic performance acceptance tests – Grade 1, 2 and 3 GB 3836.1 Explosive atmospheres – Part 1: Equipment – General Requirements GB 3836.2 Explosive atmospheres – Part 2: Equipment protection by flameproof enclosures “d” GB 3836.3 Explosive atmospheres – Part 3: Equipment protection by increased safety “e” GB/T 4942.1 Degrees of protection provided by the integral design of rotating electrical machined (IP code) – Classification GB/T 6391 Rolling bearings – Dynamic load ratings and rating life GB/T 7306.2 Pipe threads with 55° thread angle where pressure-tight joints are made on the threads – Part 2: Taper internal and external threads GB/T 7307 Pipe threads with 55° thread angle where pressure-tight joints are made on the threads GB/T 9124 (all parts) Specification for steel pipe flanges GB/T 9125 (all parts) Fasteners for pipe flange joints GB/T 9126 Dimensions of non-metallic flat gaskets for pipe flanges GB/T 9239.1-2006 Mechanical vibration – Balance quality requirements for rotors in a constant (rigid) state – Part 1: Specification and verification of balance tolerances GB/T 13306 Plate GB/T 19204 General characteristics of liquefied natural gas GB/T 22670 Test procedures for converter-fed three phase cage induction motors GB/T 22719.1 Interturn insulation of random-wound winding for AC low-voltage electrical machines – Part 1: Test methods GB/T 29529-2013 Methods of measuring and evaluating noise of pumps GB/T 29531-2013 Methods of measuring and evaluating vibration of pumps JB/T 6880.2 Steel castings for pumps JB/T 6913 Cleanliness of pump products 3 Terms and Definitions For the purposes of this Document, the terms and definitions given in GB/T 3215-2019 and the following apply. 3.1 Sump A sealed metallic container for installing submersible pumps. 3.2 Thermal transient working condition The working conditions in which the fluid temperature in the pump changes due to compression, throttling, friction, etc. a) Based on the center of the first-stage impeller of the submersible pump, the submerged depth shall not exceed 20m: b) Medium temperature is no lower than -196°C, and no higher than -110°C: c) The submersible pump operates within the range of 70%~120% of the rated flow. 5.1.3 The performance of the submersible pump is based on the specified speed. 5.1.4 The NPSH3 value at the specified point of the submersible pump shall not exceed the guaranteed NPSHR value. 5.1.5 During the operation of the submersible pump, the change of power supply voltage and frequency and its influence on the performance of the motor and the limit of temperature rise shall comply with the provisions of GB/T 755-2019. 5.1.6 Under specified operating conditions, the mean time between failures of submersible pumps shall be no less than 5000h. 5.1.7 The design of the submersible pump shall meet the following requirements: --- Thermal transient working conditions shall comply with the provisions of GB/T 19204; --- During the hydrostatic test, the maximum allowable working pressure of the pressure- bearing parts shall be less than 90% of the elastic limit stress of the materials used for the parts at 293K; --- Connecting flanges, fasteners (nuts and bolts) and gaskets shall comply with the provisions of GB/T 9124 (all parts), GB/T 9125 (all parts) and GB/T 9126. 5.1.8 The submersible pump shall be able to work at the maximum continuous speed. The maximum continuous speed shall meet the following requirements: a) It is equal to the corresponding synchronous speed under the condition of the maximum supply frequency of the motor; b) For variable-speed submersible pumps and fixed-speed submersible pumps that may overspeed, it shall be no lower than 110% of their rated speed. 5.1.9 Submersible pumps should have a stable head-flow curve for all application conditions. 5.1.10 The rated flow point of the submersible pump shall be within the range of 80%~110% of the flow rate of the best efficiency point of the provided submersible pump. 5.1.11 The enclosure protection level of the submersible pump shall be IP50 or above specified in GB/T 4942.1. 5.1.12 The rating of the submersible pump is the continuous rating based on the continuous 5.3.2.4 The length of the first pipeline threaded or welded to the shell should not exceed 150mm. For DN25 and smaller, it shall be at least Sch160 seamless pipe; and for DN40, it shall be at least Sch80 seamless pipe. 5.4 Rotor 5.4.1 The impeller shall be designed as a closed structure; and the inlet end of the blade shall be a round head. 5.4.2 The impeller and shaft shall be connected by key; and no pin shall be used to fix the impeller to the shaft. Clamping sleeves may be used with purchaser approval. During normal rotation, the fastening device shall use the resistance of the liquid to the impeller to keep the thread in a tightened state; and there shall be a reliable mechanical locking method (such as a pin and a corrosion-resistant set screw or a tongue washer). Cap screws shall have recess with rounded corners and reduced diameter to reduce stress concentrations. 5.4.3 All the keyways of the shaft shall have a fillet radius in accordance with GB/T 1974. 5.4.4 The shaft shall be machined and polished along its entire length; and the total indication runout should not exceed 40μm/m. The total runout over the full length of the shaft should not exceed 80 µm. 5.5 Wear rings and running clearances 5.5.1 Radial running clearances shall be used to limit internal leakage. A replaceable wear ring shall be installed in the shell. The impeller shall have integral wear surfaces, or replaceable wear rings. 5.5.2 The hardness difference between the impeller sealing ring of the submersible pump and the wear-resistant surface of the shell sealing ring is at least 50HBW. 5.5.3 If replaceable wear rings are used, they shall be located by means of locking pins, press fits of saddle screws (axial or radial), or spot welds. The diameter of the radial pin hole or threaded hole on the wear ring is no greater than 1/3 of the width of the wear ring. 5.5.4 The running clearance shall meet the following requirements: --- When determining the internal running clearance of wear rings and rotating parts, the pumping temperature, suction conditions, properties of the liquid pumped by the pump, thermal expansion and seizure characteristics of the material, and pump efficiency shall be considered. The clearance shall be large enough to ensure the reliability of the work under all specified working conditions and to avoid seizure. --- For copper alloy, aluminum alloy and stainless steel, the minimum diameter clearance given in Table 1 shall be used. --- For non-metallic wear ring materials with very low or no tendency to seize, the vendor 5.6 Motor 5.6.1 The motor of the submersible pump shall be able to drive the submersible pump safely and reliably when submerged in the working medium, so that the submersible pump can provide the required flow and head. 5.6.2 The materials selected for submersible pump motor shall meet the following requirements: --- The selected materials shall meet the requirements of their material standards and have valid material inspection reports; --- It has the properties of low temperature resistance, durability, corrosion resistance, moisture .......
Source: https://www.ChineseStandard.net/PDF.aspx/JBT13977-2020