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Water Supply and Sewerage Systems: How to Avoid Mistakes from Design to Commissioning

WS systems are an essential part of any building. Errors in pipe diameter calculation or sewer slope design can lead to failures, Rospotrebnadzor (Federal Service for the Oversight of Consumer Protection and Welfare) fines, and up to 30% higher operating costs.

A well-prepared project ensures:

  • Uninterrupted clean water supply.
  • Safe collection and disposal of wastewater.
  • Full compliance with sanitary standards.
  • Reduced operating expenses.

Types of Water Supply and Sewerage Systems

External Water Supply Networks

Main pipelines from the entry point, pumping stations, shut-off valves, and manholes. Their purpose is to deliver water to the site with the required flow rate and pressure.

Internal Water Supply Networks

Risers, branches, distribution pipelines, and water intake devices. Materials include multilayer plastic, polyethylene, or steel — depending on operating conditions.

External Sewerage Networks

Stormwater and domestic pipelines, collectors, inspection wells. Correct slopes are crucial for self-cleaning and to allow future connections from neighboring facilities.

Internal Sewerage Networks

Risers, outlets, horizontal pipelines. Ventilation risers are mandatory to prevent odors, along with water seals (traps).

Purpose and Importance of WS Systems

Water supply systems provide:

  • Continuous delivery of potable and technical water.
  • Stable flow rates and pressure throughout the building.

Sewerage systems handle:

  • Collection of domestic, industrial, and storm wastewater.
  • Safe discharge into municipal or autonomous networks.

Errors in pipeline routing, equipment selection, or diameter calculations can result in low pressure, blockages, higher maintenance costs, and sanitary violations.

Regulatory Framework

We rely on the following standards when designing WS systems:

  • Set of rules 32.13330.2018 (Building code standard 2.04.03-85) – Sewerage. External networks and facilities.
  • Set of rules 31.13330.2021 (Building code standard 2.04.02-84) – Water supply. External networks and facilities.

Additional legal acts and software packages are also applied for hydraulic calculations.

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    Project Documentation: Typical WS Section

    Documentation BlockContent
    Input data

    Technical specifications, geodata, network TU

    Calculation schemes

    Hydraulic diagrams, pipe sizing

    Specifications
    Pumps, valves, pipes, fittings
    Drawings
    Pipeline routing (external/internal), nodes, sections

    Stages of WS Project Implementation

    • Pre-project survey — collecting requirements, analyzing existing conditions.
    • Design — preparing technical documentation and calculations.
    • Approval — expert review, obtaining permits.
    • Installation & commissioning — equipment installation, flushing, pressure testing.
    • Commissioning — final testing, as-built documentation.

    We can manage the project turnkey or join at any stage.

    Integration of WS with Other Engineering Systems

    Coordination across disciplines reduces clashes and lowers costs:

    • Power supply — for pumps and automation.
    • HVAC — shared water circuits for heating/cooling.
    • Automation (BMS/SCADA) — remote monitoring of pressure, flow, and alarms.

    FAQ: Common Questions About WS Projects

    Can I replace pipes without a project?

    No. Any changes in pipe diameters or layout schemes require approval (Set of rules 30.13330). Additionally:

    • New construction (Town Planning Code of the Russian Federation).
    • Reconstruction with changes in network capacity.
    • Transition to autonomous water supply (wells, treatment stations).
    What are the typical mistakes in DIY WS design?
    • Incorrect sewer slopes
    • Errors in selecting pumping equipment (+35% in energy consumption)
    • Lack of SRO approval (100% rejection in expert review)
    Is BIM design mandatory for WS projects?

    Yes, starting from 2025, the use of BIM design becomes mandatory not only at the design stage but also during construction.

    This is established by Government Decree of the Russian Federation No. 331:

    • If the project is developed after July 1, 2024, the developer is already required to use BIM.
    • If the project was designed before this date, but construction starts after January 1, 2025, it must also be accompanied by digital models.

    Why Choose Us as Your WS Partner

    • years of industry experience in engineering systems.
    • Methodological rigor — clear algorithms and thorough quality checks.
    • Strict timeline and budget control — transparent planning.
    • Integrated approach — no conflicts with other engineering sections.
    • Service and support — warranty coverage, remote monitoring, and system upgrades.

    Mistakes at any stage can cause costly repairs, sanitary violations, and downtime.

    Entrust your project to professionals — we will provide a free consultation and preliminary schedule & cost estimate.

    Call us: +7 (812) 413-97-87 Email us: info@promenergo.pro, or

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