GB 33147-2025Liquefied dimethyl ether steel gas cylinders (English PDF)

3 Terms and definitions

4 Symbols

5 Types of cylinders

6 Materials

7 Design

8 Manufacture

9 Test and inspection requirements

10 Marking, coating, packaging, storage, transport and factory documentation

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 33147-2016, Liquefied dimethyl ether steel gas cylinders. In addition to structural adjustments and editorial changes, the main technical changes compared with GB/T 33147-2016 are as follows:

a) the modification serial number has been changed from Roman letters to Chinese capital numerals (see 5.1; 5.1 of the 2016 edition);

b) the cylinder models have been changed (see 5.2; 5.2 of the 2016 edition), and the model parameter "allowable filling weight" and requirements for indoor placement of cylinders have been added (see 5.2);

c) detailed requirements for the chemical composition of the main cylinder material have been added (see 6.2);

d) the requirement for the yield-to-tensile ratio of the main cylinder material has been changed (see 6.3.2; 6.2.2 of the 2016 edition);

e) requirements for the appraisal of design documents have been added (see 7.1.1);

f) the requirements for the assembly form of heads and cylindrical shell have been changed (see 7.1.2; 7.1.1 of the 2016 edition);

g) a requirement for the minimum nominal wall thickness has been added (see 7.2.5);

h) a requirement for the consistency of the shroud and foot ring materials with the shell material has been added (see 7.3.2);

i) the requirement for the specification of the valve boss of the cylinder has been changed (see 7.3.4; 7.3.4 of the 2016 edition), and requirements for the dimensions of the valve boss have been added (see 7.3.4);

j) a requirement on the standard to be applied for welding procedure qualification has been added (see 8.4.1.1);

k) requirements for heat treatment equipment, procedure qualification and requalification have been added (see 8.5);

l) a requirement for the sampling quantity for radiographic testing has been added (see 9.1.3);

m) a requirement for confirmation of the hydrostatic test results of cylinders by the cylinder supervisory inspection body has been added (see 9.2.2.3);

n) the requirement for the number of gas tightness tests has been changed (see 9.2.3.2; 9.2.3.2 of the 2016 edition);

o) the requirement for the quantity of cylinders in an inspection batch has been changed (see 9.3.1.2; 9.3.1.2 of the 2016 edition);

p) the requirement for the ratio of the mandrel diameter to the measured specimen thickness for the cylinder material has been changed (see 9.3.3.5; 9.3.3.3.2 of the 2016 edition);

q) the requirements for hydraulic burst pressure and volumetric expansion rate have been changed (see 9.3.4; 9.3.4 of the 2016 edition);

r) requirements for batch checks of dimensions, weight and volume have been added (see 9.3.5 and 9.3.6);

s) requirements for testing, confirmation and recording of electronically readable marking have been added (see 9.3.7 and 10.1.7);

t) requirements for the pressure cycling test have been added (see 9.4);

u) type test items and sampling requirements have been added (see 9.6), and the requirements for repeating type tests have been changed (see 9.6; 9.6 of the 2016 edition);

v) a requirement for liquid-phase cylinders to have the character for "liquid" impressed (recessed) on the upper head has been added (see 10.1.2), and the requirement for the location of the head marking has been changed (see 10.1.2; 8.1.2 of the 2016 edition);

w) a requirement for the depth of steel-stamped characters has been added (see 10.1.3);

x) requirements for a unique cylinder number and a cylinder traceability system have been added (see 10.1.4 and 10.1.5);

y) requirements for the establishment and maintenance by the manufacturer of an official website for product quality and safety traceability information of cylinders have been added (see 10.4.1);

z) a requirement for an electronically readable identification at dispatch from the factory has been added (see 10.4.2).

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 State Administration for Market Regulation.

This document was first published in 2016; this is the first revision.