Foreword
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard is modified in relation to GB 18428-2010 Glass bulbs used for automatic fire extinguishing systems.
The following main changes have been made with respect to GB 18428-2010:
——The nominal action temperature of glass bulb is different, which is 110°C in this standard according to the operating temperature of pressure relief devices of gas cylinders;
——The definitions and test-related requirements of fast response glass bulb and standard response glass bulb are deleted;
——The light fading test and the working solution volatilization test are deleted.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of the Cylinder Safety Standardization and Information Working Committee of China Association for Technical Supervision Information.
Technical conditions of glass bulbs used for pressure relief devices of gas cylinders
1 Scope
This document specifies the technical requirements, inspection and test methods, inspection rules, operation instruction and product data sheet, marking, packaging, storage and transportation of glass bulbs used for pressure relief devices of gas cylinders (hereinafter referred to as glass bulbs).
This document is applicable to the glass bulbs used for pressure relief devices of gas cylinders.
2 Normative references
The following documents contain requirements 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 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.12003, ISO 2859-1: 1999, IDT)
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (Apply to inspection of process stability)
GB/T 13005 Terminology of gas cylinders
GB/T 35544 Fully-wrapped carbon fiber reinforced cylinders with an aluminum liner for the on-board storage of compressed hydrogen as a fuel for land vehicles
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
static operating temperature
temperature when the glass bulb cylinder breaks in the liquid bath at certain heating rate (°C)
3.2
nominal action temperature
designed operating temperature of glass bulb (°C)
3.3
response time index (RTI)
coefficient which is determined under standard conditions and used for measuring the sensitivity of glass bulb
Expression: RTI = u0.5
where,
RTI——the response time index, (m?s)0.5;
——the response time constant, s;
u——the gas velocity, m/s.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Inspection and test methods
6 Inspection rules
7 Operation instruction and product data sheet
8 Marking, packaging, storage and transportation
