GB/T 19533-2024 Periodic inspection and evaluation of steel gas cylinders for the on-board storage of compressed natural gas as a fuel for automotive vehicles
1 Scope
This document specifies the basic methods and technical requirements for the periodic inspection and evaluation of steel gas cylinders for the on-board storage of compressed natural gas as a fuel for automotive vehicles (hereinafter referred to as "cylinders").
This document is applicable to seamless, reusable, refillable cylinders with a nominal working pressure of 20MPa or 25MPa, a nominal capacity ranging from 30L to 300L, and a working temperature between -40℃ and 65℃, which are filled with compressed natural gas as vehicle fuel conforming to GB 18047, and fixed on vehicles and used as fuel tanks.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8335 Special threads for gas cylinders
GB/T 8336 Special thread gauges for gas cylinders
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 10878 Special taps of taper threads for gas cylinders
GB/T 12137 Methods for leakage test of gas cylinders
GB/T 13005 Terminology of gas cylinders
GB/T 17258 Steel cylinders for the on-board storage of compressed natural gas as a fuel for automotive vehicles
NB/T 47013.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
TSG 23 Regulation on safety technology for gas cylinder
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and the following apply.
3.1
abrasion
damage to cylinders caused by friction of materials due to scraping, grinding, or vibration
3.2
PRD end plug
plug installed at one end of a cylinder with a neck-in structure at both ends, equipped with a pressure relief device (PRD) and a blinding function
4 Inspection tools and devices, periodic inspection periods, and periodic inspection items
4.1 Inspection tools and devices
The inspection tools and devices shall include at least the following:
a) Lighting device: Used to inspect the inner and outer surfaces of the cylinder and the surfaces of accessories. The voltage of the safety light source shall not exceed 24V;
b) Endoscope: Used to inspect the inner surface of the cylinder, with high-definition color display and storage functions;
c) Special tools such as torque wrench: Used for disassembling and installing cylinder, cylinder valve, or PRD end plug;
d) Length measurement tools (including ruler, square ruler, tape measure, and vernier caliper): Used to measure the length and depth of damage, etc.;
e) Ultrasonic thickness meter: Used to measure the wall thickness of the cylinder;
f) Weighing apparatus: Used to measure the mass and capacity of the cylinder. The weighing apparatus shall be accurate, with a maximum weighing capacity of 1.5 to 3.0 times the common weighing capacity, and an accuracy class of medium; its verification or calibration period shall comply with the relevant regulations;
g) External hydrostatic test device: Used for hydrostatic test of the cylinder;
H) Leakage test device: Used for leakage test of the cylinder;
i) Residual gas treatment device: Used for the treatment of media inside the cylinder;
j) Cleaning device: Used to clean contaminants and corrosion products on the inner and outer surfaces of the cylinder;
k) Thread gauge and tap: Used for inspecting and repairing the threads of the cylinder neck. The tap and gauge shall comply with the requirements of GB/T 10878 and GB/T 8336, respectively;
1) Copper hammer: With a mass of approximately 250g, used for acoustic inspection;
m) Magnetic particle testing device: Used to detect cracks or crack-like defects in the cylinder.
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Inspection tools and devices, periodic inspection periods, and periodic inspection items
4.1 Inspection tools and devices
4.2 Periodic inspection periods
4.3 Periodic inspection items
5 Preparation for inspection
5.1 Records
5.2 Handling of medium inside the cylinder
5.3 Cylinder valve removal and surface cleaning
6 Appearance inspection and evaluation
6.1 General requirements
6.2 Inspection and evaluation of cracks, laminations, bulges, cuts, abrasions, gouges, wear, and dents
6.3 Inspection and evaluation of fire damage
6.4 Inspection and evaluation of corrosion
6.5 Inspection and evaluation of cylindrical shell deformation
7 Hammer inspection and evaluation
8 Inspection and evaluation of cylinder opening threads
9 Internal inspection and evaluation
10 Non-destructive testing
10.1 Magnetic particle testing
10.2 Ultrasonic testing
11 Determination of mass and capacity
12 Hydrostatic test
13 Internal drying
14 Inspection and assembly of cylinder valves
15 Leakage test
16 Post-inspection procedures
Annex A (Informative) Measurement methods for depth of dents, cuts, abrasions, gouges, and wear
Annex B (Normative) Determination method for the capacity of cylinders
Bibliography
