Sizing and Protecting the Water Supply System – Module ID 02312-14

Sizing and Protecting the Water Supply System – Module ID 02312-14

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Module 02312-14 describes techniques for sizing water supply systems, including calculating system requirements and demand, developed lengths, and pressure drops. The module also introduces the different types of backflow prevention devices and discusses how they work, where they are used, and how they are installed.

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Description

Objectives

Learning Objective 1 – Determine the factors that affect the sizing of water supply systems.

  • Determine how temperature and density affect water supply systems.
  • Determine how flow and friction affect water supply systems.

Learning Objective 2 = Size a given water supply system for different acceptable flow rates and calculate pressure drops in a given water system.

  • Determine how to establish system requirements for a given water supply system.
  • Determine how to calculate demand for a given water supply system.
  • Determine the correct pipe size based on system and supply pressures in a given water supply system.
  • Determine how to calculate system losses in a given water supply system.

Learning Objective 3 – Describe the six basic backflow-prevention devices and the hazards they are designed to prevent.

  • Describe the principle of backflow due to back siphonage and back pressure.
  • Describe when and how to install air gaps.
  • Describe when and how to install atmospheric vacuum breakers.
  • Describe when and how to install pressuretype vacuum breakers.
  • Describe when and how to install dual-check valve backflow preventer assemblies.
  • Describe when and how to install doublecheck valve assemblies.
  • Describe when and how to install reduced- pressure zone principle backflow preventer assemblies.
  • Describe when and how to install specialty backflow preventers.
  • Describe when and how to troubleshoot and repair backflow preventers.

Performance Tasks

Performance Task 1 (Learning Objective 2) – Using design information provided by the instructor, lay out a water supply system and calculate developed lengths of branches.

Performance Task 2 (Learning Objective 3) – Install common types of backflow preventers

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