Welded stainless steel cylinders
1 Scope
This standard specifies the most basic requirements for the materials, design, manufacturing procedure, test methods, inspection rules, marking, packaging, transportation and storage of welded stainless steel cylinders (hereinafter referred to as cylinders).
This standard is applicable to cylinders which are used at the ambient temperature of -40~60℃, of which the hydraulic test pressure is not greater than 6.0MPa (gauge pressure) and the nominal water capacity is 0.5~1,000L, and may be refilled with compressed gas, low-pressure liquefied gas and dissolved gas compatible with cylinder materials.
2 Normative references
The following referenced documents are indispensable for the application 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 150.3 Pressure vessels - Part 3: Design
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 232 Metallic materials - Bend test
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 4334-2008 Corrosion of metals and alloys - Test methods for intergranular corrosion of stainless steels
GB/T 7144 Coloured cylinder mark for gases
GB 8335 Special threads for gas cylinders
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for cycling test of gas cylinders
GB/T 12137 Methods for leakage test of gas cylinders
GB/T 13005 Terminology of gas cylinders
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB/T 15384 Designation for gas cylinders
GB/T 15385 Method for hydraulic burst test of gas cylinder
GB/T 16163 Classification of gases filled in cylinder
GB/T 17925 Standard practice for X-ray digital radioscopic examination of cylinder weld
GB 24511 Stainless steel plate, sheet and strip for pressure equipments
NB/T 47013.2 Nondestructive testing of pressure equipments - Part 2: Radiographic testing
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and the following apply.
3.1.1
batch
quantity of cylinders made consecutively using the same manufacturing technology, with the same design, designation of material and welding procedure
3.1.2
yield stress
normal stress when the material yields, taken as value of Rp0.2 specified in the material standard
3.1.3
design stress factor
ratio of equivalent wall stress to yield stress Rp0.2 of the material at test pressure Ph
3.2 Symbols
For the purposes of this document, the following symbols apply.
a: clearance between the curved surface of seal head and the template, mm.
A: elongation after fracture of the specimen, %.
b: misalignment of weld, mm.
c: concave-convex amount of seal head surface, mm.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Materials
5 Design
6 Manufacture and procedure
7 Test methods
8 Inspection rules
9 Type test
10 Marking, packaging, transportation and storage
11 Delivery documents
Annex A (Normative) Colored marks of welded stainless steel cylinders
Annex B (Informative) Product certificate
Annex C (Informative) Quality certificate for batch inspection
Bibliography
