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Standards and Codes of Practice

GENERAL

Both ISO and EN Standards are available covering PE100 pipe. The relevant Standards are:

  • ISO 4427-2: Plastics piping systems. Polyethylene pipes & fittings for water supply – Part 2: Pipes
  • EN 12201-2: Plastics piping systems for water supply – Polyethylene – Part 2: Pipes
  • EN 1555-2: Plastics piping systems for the supply of gaseous fuels – Polyethylene – Part 2: Pipes
  • ISO 4437-2: Plastics piping systems for the supply of gaseous fuels – Polyethylene – Part 2: Pipes

There are also national standards that are applicable in certain cases. The following are examples from the UK (GIS = Gas Industry Standard):

  • GIS/PL2-2: Polyethylene pipes & fittings for transport of natural gas and suitable manufactured gas – Part 2: Pipes for use at pressures up to 5.5 bar
  • GIS/PL2-4: Polyethylene pipes & fittings for transport of natural gas and suitable manufactured gas – Part 4: Fusion fittings with integral heating element(s)
  • GIS/PL2-8: Polyethylene pipes & fittings for transport of natural gas and suitable manufactured gas – Part 8: Pipes for use at pressures up to 7 bar

Codes of Practice are generally specific to individual countries, industry sectors or utilities. Most asset owners be they national, network or other owners will have their own Codes, Manuals or Guidelines to cover the correct installation practice which must be followed. In addition national Safety and Government legislation exists in most countries and must be followed.

RENOVATION/REHABILITATION

All rehabilitation works for water mains using polyethylene liner pipes should now be carried out in accordance with the relevant ISO Standards.

There are four general System Standards for renovation using plastics piping systems:

  • ISO 11296: Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks.
  • ISO 11297: Plastics piping systems for renovation of underground drainage and sewerage networks under pressure.
  • ISO 11298: Plastics piping systems for renovation of underground water supply networks.
  • ISO 11299: Plastics piping systems for renovation of underground gas supply networks.

These System Standards are distinguished from those for conventionally installed plastics piping systems by the requirement to verify certain characteristics in the as-installed condition, after site processing. This is in addition to specifying requirements for plastics piping systems components as manufactured.

This System Standard comprises a:

  • — Part 1: General

and all applicable renovation technique family-related parts from the following:

  • — Part 2: Lining with continuous pipes
  • — Part 3: Lining with close-fit pipes
  • — Part 4: Lining with cured-in-place pipes
  • — Part 6: Lining with adhesive-backed hoses
  • — Part 7: Lining with spirally-wound pipes

The requirements for any given renovation technique family are given in part 1, applied in conjunction with the relevant other part. For example, ISO 11298-1 and this part of ISO 11298 together specify the requirements relating to lining with close-fit pipes. For complementary information, see ISO 11295. Not all technique families are pertinent to every area of application and this is reflected in the part numbers included in each System Standard.

A consistent structure of clause headings has been adopted for all parts of ISO 11298, in order to facilitate direct comparisons across renovation technique families.

Figure 1 shows the common part and clause structure and the relationship between ISO 11298 and the System Standards for other application areas.


Figure 1 - Format of the renovation System Standards

In addition ISO 11295: Classification and Information on design of plastics piping systems used for renovation applies to all the systems covered by the systems standards: water supply, gas supply, non-pressure drainage and sewerage, and drainage and sewerage under pressure.

Examples are given below of national guidance that must be followed in the United Kingdom. Similar guidance is applicable in most other countries. Gas works especially are governed by strict safety regulation which applies to all installation and rehabilitation operations. Water works are governed by regulations to protect potable water quality and public health.

Health & Safety Executive

  • HSG 47 - Avoiding danger from underground services
  • INDG258 - Confined spaces - A brief guide to working safely
  • NRSWA - New Roads and Streetworks Act

Institution of Gas Engineers

  • IGEM/TD/3 edition 4 – Steel and PE pipelines for Gas distribution

Gas Networks

  • T/PR/ML/1 to ML/4 – Work Procedures for pipe system construction
  • T/PM/MSL/1 - Management procedure for main laying and service laying
  • T/PR/SL/1 - Work procedure for service laying Up to and including 63mm diameter at pressures up to and including 2bar

Water

  • WIS 4-32-08.- Fusion jointing of polyethylene pressure pipeline systems using PE80 and PE100 materials
  • The (Water) Regulators Specification & The Water Supply (Water Fittings) Regulations 1999



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