Overview
ISO/TR 7035-2:2024 - Design and asset management of DIP for water application - Part 2: Design, installation and operation is a technical report that guides the design, installation and operational practices for ductile iron pipeline (DIP) systems used in water supply. It is intended to assist conceptors, engineering offices, water companies and project owners in delivering new systems, rehabilitating or renovating existing networks. The document complements ISO/TR 7035-1 by referencing chapter links and by pointing to existing product and test standards for materials, coatings and site testing.
Key Topics and Technical Requirements
This report covers practical, design-to-operation topics with emphasis on safe, durable water supply networks. Key technical topics include:
- Water quality safeguards
- Material selection, prevention of backflow, stagnation control and cross‑connection avoidance.
- Design life and demand considerations
- Target design life, general water demand estimation and provisions for fire‑fighting demand.
- Hydraulic and structural design
- Hydraulic sizing of mains, local mains and service pipes; structural design principles for buried and supported pipelines.
- System layout and components
- Layout rules for mains, service pipes, valves, reservoirs and pump stations to ensure serviceability and security.
- Protection against aggressive environments
- External and internal protection measures (coatings, linings) to mitigate corrosion and soil aggressivity.
- Hydraulic thrust restraint design
- Principles for calculating thrust forces and practical solutions: thrust blocks and restrained‑joint systems.
- Trenchless and alternative installation methods
- Design and site considerations for pipe jacking, horizontal directional drilling, casing methods and pipe bursting.
- Pipelines on supports
- Support design, loadings and special cases for above‑ground or spanning installations.
- Installation, hydrostatic testing and commissioning
- Best practices for installation and the basic contents for hydrostatic tests.
- Flushing, disinfection, operation and maintenance
- Procedures for commissioning, monitoring, inspection, routine maintenance and repair of pierced, broken or leaking junctions.
Practical Applications and Users
ISO/TR 7035-2 is valuable for:
- Water utilities and asset managers planning new distribution mains or rehabilitation projects.
- Consulting engineers and design offices preparing hydraulic and structural designs.
- Contractors executing trenchless installations, hydrostatic testing and commissioning.
- Project owners and regulators setting specifications, procurement requirements and acceptance criteria.
Keywords: ISO/TR 7035-2:2024, ductile iron pipe, DIP for water application, water supply design, trenchless methods, hydraulic thrust restraint, hydrostatic test, flushing and disinfection, asset management.
Related Standards
- ISO/TR 7035-1 (companion document referenced for chapters and context)
- The report also refers to existing product and test standards for materials, coatings and site testing (as applicable to local regulatory frameworks and procurement).