ISO 8283-4:1992

Overview

ISO 8283-4:1992 - Plastics pipes and fittings: Dimensions of sockets and spigots for discharge systems inside buildings - Part 4: Acrylonitrile/butadiene/styrene (ABS) - defines the dimensional, classification and designation system for ABS sockets and spigots used in internal building discharge systems. The standard specifies design formulae, derived dimensions and tolerances for joints intended to accommodate expansion and contraction, and includes normative Annex A (ring‑seal calculations) and Annex B (solvent‑cement calculations).

Key topics and requirements

• Scope: Applies to ABS fittings and integral ABS sockets for discharge systems inside buildings where joints must accommodate thermal expansion and contraction.
• Classification:
  • Ring‑seal sockets and solvent‑cement sockets.
  • Socket types: S (short), M (medium), L (long) and CS (short solvent cement).
  • Further sub‑classification: Normal (N) for ring‑seal only, Dual‑purpose (DP) for ring‑seal or solvent‑cement.
• Functional uses:
  • Type S/M for expansion joints in shorter pipe runs; Type L for long/expansion/fixed systems.
  • Type CS for solvent cement joints under controlled conditions.
• Dimensional specifications:
  • Detailed measurement locations illustrated (figures 1–3) for inside diameter, engagement length, lead‑in, sealing depth, spigot length and expansion gap.
  • Numeric limits are provided in Tables 1–4 for nominal outside diameters; calculated values are rounded to 0.1 mm for diameters and 1 mm for other dimensions.
• Design calculations:
  • Annex A: ring‑seal groove and socket design relationships.
  • Annex B: solvent‑cement socket/spigot dimension calculations.
• Tolerances and manufacturability:
  • Ovality/inside‑diameter tolerance requirements are specified; for very thin‑walled sockets (wall‑to‑diameter ratio < 0.035) some ovality requirements do not apply.

Practical applications

• Ensures interchangeability and reliable joint performance for ABS drainage systems inside buildings (soil, waste and drainage).
• Guides manufacturers in tooling and production of sockets and spigots to consistent tolerances.
• Used by plumbing engineers, specifiers, installers and testing laboratories to select appropriate socket types (S, M, L, CS) and jointing technique (ring‑seal or solvent cement).
• Supports compliance with national codes of practice when designing systems that must accommodate expansion and contraction.

Related standards

• ISO 8283 Parts 1–3 (PVC‑U/PVC‑C, PE, PP) - companion parts covering other plastics.
• ISO 161‑1:1978 - referenced for nominal outside diameters and metric series.

Keywords: ISO 8283-4:1992, ABS sockets, spigots, ring‑seal, solvent cement, dimensions, tolerances, discharge systems inside buildings, expansion joints.