GB/T 40530-2021 English PDF

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GB/T 40530-2021: Ships and marine technology - Safety valve for cargo tanks of LNG carriers - Design and testing requirements
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Basic data

Standard ID: GB/T 40530-2021 (GB/T40530-2021)
Description (Translated English): Ships and marine technology - Safety valve for cargo tanks of LNG carriers - Design and testing requirements
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: U52
Word Count Estimation: 14,186
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40530-2021: Ships and marine technology - Safety valve for cargo tanks of LNG carriers - Design and testing requirements

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Ships and marine technology - Safety valve for cargo tanks of LNG carriers - Design and testing requirements ICS 47.020.30 CCSU52 National Standards of People's Republic of China Ships and offshore technology LNG carriers Design and test requirements of safety valves for liquid cargo tanks (ISO 18154.2017, IDT) Released on 2021-08-20 2022-03-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Main valve components 2 4.1 Valve body 2 4.2 Nozzle 2 4.3 Disc 2 4.4 Valve cover 2 4.5 Diaphragm 2 5 Design 3 6 Material 4 7 Product inspection 4 7.1 Objective 4 7.2 Impact test 4 7.3 Non-destructive testing 4 7.4 Pressure test 4 7.5 Visual inspection 5 7.6 Visual inspection 5 8 Performance test 5 8.1 Room temperature performance test 5 8.2 Leak test at room temperature 6 8.3 Low temperature performance test 6 8.4 Preparation for low temperature performance test 7 8.5 Low temperature leak test 7 9 Vacuum test 8 9.1 Purpose 8 9.2 Vacuum test conditions 8 10 Type test 9 11 Pilot safety valve performance determination 9 12 Pilot operated safety valve specifications 9 13 Marks and seals 9 Reference 10

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. The translation method used in this document is equivalent to the adoption of ISO 18154.2017, Safety of Cargo Tanks of Ships and Offshore Technology Liquefied Natural Gas Carriers Valve design and test requirements". The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows. ---GB/T 28778-2012 pilot operated safety valve (ISO 4126-4.2004, MOD) Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed and managed by the National Marine Machinery Standardization Technical Committee (SAC/TC137). Drafting organizations of this document. China Shipbuilding Industry Comprehensive Technical and Economic Research Institute, Dalian Marine Valve Co., Ltd., Shanghai Hudong Shipbuilding Valve Co., Ltd., Shuangheng Valve Group Co., Ltd., Zhoushan Quality and Technical Supervision and Inspection Institute. The main drafters of this document. Sun Yaogang, Zhou Xue, Jin Ning, Hao Huadong, Chen Shengtan, Wang Shikai, Weng Wuxiu, Chen Xing, Shi Haolei, Huang Xiaowei, Cao Haipeng. Ships and offshore technology LNG carriers Design and test requirements of safety valves for liquid cargo tanks

1 Scope

This document specifies the design, test and inspection methods of diaphragm pilot operated safety valves. The safety valve in this document is applicable to the cargo tank of LNG carriers to keep the pressure in the tank below the maximum allowable working pressure.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. ISO 4126-4 Overpressure protection safety equipment Part 4.Pilot operated safety valve (Safetydevicesforprotectionagainst excessivepressure-Part 4.Pilotoperatedsafetyvalves) IMO Code for Construction and Equipment of Ships Carrying Liquefied Gas in Bulk (IGC Code) [TheInternationalCodefortheCon- structionandEquipmentofShipsCarryingLiquefiedGasesinBulk(IGCCode)] APISTD527 pressure relief valve sealing performance (SeatTightnessofPressureReliefValves) ASMEB16.34 flange, thread and welding connection valve (Valves-Flanged, Threaded and WeldingEnd)

3 Terms and definitions

The following terms and definitions apply to this document. The URLs of the termbases used by ISO and IEC for standardization are as follows. 3.1 Blowdown The difference between the set pressure and the return pressure. Note. The opening and closing pressure difference is usually expressed as a percentage of the set pressure. When the set pressure is less than 3 bar, it is expressed in bar. 3.2 Flowarea The cross-sectional area of the flow path between the inlet end and the valve seat (excluding the area of the curtain) is used to calculate the theoretical flow rate without any resistance. 3.3 Opening height lift The actual stroke of the main disc from the closed position. 3.4 Pilot operated safety valve An automatic device composed of a main valve and a pilot valve. Note. The guide only responds to the fluid pressure without any external force and controls the operation of the main valve. When the fluid pressure rises to the set point, the valve opens. When fluid ......

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