This part of GB/T 18477 specifies the materials, classification, pipe structure and connection, technical requirements, test methods, inspection rules, marking, transportation and storage of unplasticized polyvinyl chloride (PVC-U) double wall corrugated pipes for underground soil waste and drainage which is mainly made of polyvinyl chloride resin and formed through extrusion (hereinafter referred to as "pipes").
This part is applicable to non-pressure pipes for municipal underground drainage, building outer drainage and farmland drainage as well as sleeves of communication cables.
It is also applicable to non-pressure underground industrial drainage pipelines considering chemical resistance and temperature resistance of materials.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 18477. For dated references, subsequent amendments(excluding corrections), or revisions, of any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 1033-1986 Test Method for Density and Relative Density of Plastics
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attributes - Part1: Sampling Schemes Indexed by Acceptance quality Limit(AQL) for Lot-by-lot Inspection (ISO 2859-1:1999, IDT)
GB/T 2918-1998 Plastics - Standard Atmospheres for Conditioning and Testing (idt ISO 291:1997)
GB/T 6111-2003 Thermoplastics Pipes for the Conveyance of Fluids - Resistance to Internal Pressure - Test Method (ISO 1167:1996, IDT)
GB/T 8806 Method for Dimension Measuring of Plastic Pipes (GB/T 8806-1988，eqv ISO 3126:1974)
GB/T 9647-2003 Thermoplastics Pipes - Determination of Ring Stiffness (ISO 9969:1994, IDT)
GB/T 14152-2001 Thermoplastics Pipes - Determination of Resistance to External Blows - Round-the-clock Method (eqv ISO 3127:1994)
GB/T 18042-2000 Thermoplastics Pipes - Determination of Creep Ratio (eqv ISO 9967:1994)
GB/T 19278-2003 General Terms and Their Definitions of Thermoplastic Pipes, Fittings and Valves
ISO 13968:1997 Plastics Piping and Ducting Systems - Thermoplastics Pipes - Determination of Ring Flexibility
3 Definitions and Symbols
For the purposes of this part, the terms and symbols given in GB/T 19278-2003 and the following apply.
3.1 Definitions
3.1.1
nominal dimension DN
approximate value representing the dimension and specification of pipes, mm
3.1.2
nominal dimension DN/OD
nominal dimension regarding outside diameter, mm
3.1.3
nominal dimension DN/ID
nominal dimension regarding inside diameter, mm
3.1.4
minimum average inside diameter of socket (Dim,min)
the minimum permissible average inside diameter of any section of socket, mm
3.1.5
laminated wall thickness (e)
the thickness of any position on the pipe wall between pipe corrugations, mm.
3.1.6
inner wall thickness (e1)
the thickness of any position on the inner wall of pipe (See Figure 1), mm
3.1.7
crest height (e2)
the radial distance between internal surface of pipes and crest top (See Figure 1), mm
3.1.8
minimum bonding length of socket (Amin)
the minimum permissible bonding length between the connection sealing and the cylindrical end of inner wall of socket (see Figure 2), mm
3.2 Symbols
DN Nominal dimension
DN/OD Nominal dimension regarding outside diameter
DN/ID Nominal dimension regarding inside diameter
A Bonding length
Dim,min Minimum average inside diameter of socket
e Laminated wall thickness
e1 Inner wall thickness
e2 Crest height
L Length of pipes
L1 Effective length of pipes
