1 Scope
This Standard specifies terms and definitions, classification and designation, requirements, test methods, rest rules, marking, labeling, packaging, transportation and storage of polytetrafluoroethylene bellows compensators (hereafter referred to as compensators).
This Standard is applicable to the compensators using polytetrafluoroethylene as the overflowing position for the purpose of flexible compensation action for the pipelines, with nominal pressure PN not greater than 1.6 MPa, nominal dimension of DN25 mm~1000 mm, and operating temperature of -50℃~180℃, under the media of various concentrations, e.g. sulfuric acid, hydrochloric acid, hydrofluoric acid, benzene, alkali, aqua regia, organic solvent, reductant, and strongly-corrosive gas and liquid.
This Standard is not applicable to the compensators under such media as fused alkali, sodium metal, potassium, chlorine trifluoride and gaseous fluorine.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB 191 Packaging-Pictorial Marking for Handling of Goods
GB/T 1047-2005 Pipework Components-Definition and Selection of DN (nominal size)
GB/T 1048-2005 Pipework Components-Definition and Selection of PN
GB/T 1804-2000 General Tolerances-Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attributea-Part1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection
GB/T 2829-2002 Sampling Procedures and Tables for Periodic Inspection by Attributes (Applicable to Inspection of Stability for Productive Process)
GB/T 4240 Stainless Steel Wires
GB/T 6388 Transport Package Shipping Mark
GB/T 8923-1988 Rust Grades and Preparation Grades of Steel Surfaces before Application of Paints and Related Products
GB/T 9122-2000 Loose Plate Steel Pipe Flanges with Lapped Pipe End and Pressed Collar with Long Neck
GB/T 9124-2000 Specification for Steel Pipe Flanges
GB/T 10111 Methods for Random Sampling by Utilizing Dices of Random Number
GB/T 12777-1999 General Specification for Metal Bellows Expansion Joints
GB/T 13384 General Specifications for Packing of Mechanical and Electrical Product
GB/T 14436 General Principles of Industrial Product Guarantee Documents
HG/T 2902 Polytetrafluoroethylene Molding Powder
3 Terms and Definitions
For the purposes of this Standard, the terms established in GB/T 12777-1999 apply.
