Common installation location for meters

At the property boundary in a chamber

Purpose of installing meters in a chamber

Protection, frost prevention, and reading

Locations where water can be isolated

In the road, at the meter, or at the point of entry to the property

Water Regulations requirement for stop valve location

A stop valve should be located inside the building, above floor level, as near as possible to the point of entry.

Purpose of a stop valve when closed

Prevents water from going to any point in the building.

Recommended maximum height for MDPE above floor level

No more than 150mm, as it degrades in sunlight.

Types of stop valves that can be used

Screwed down (BS1010) or level arm (BS6675) stop valves.

Images of different types of stop valves

Illustrations of various stop valves, including screwed down and level arm types.

The stop valve works by turning the handle, which screws down a jumper with a washer to create a watertight seal.

Cost-effective repair for jammed valve

Replace the head gear only if the valve jams.

The DOV uses a spanner or key on the square drive to screw down a jumper and washer, creating a watertight seal.

DOV installation requirement

A DOV must be installed above the incoming stop valve and at every low point in the system.

Image of stop valve and DOV

Visual representation of a stop valve and a DOV.

Plumbing system compliance

Plumbing systems must comply with the Water Regulations.

Preventing water contamination

Every plumber must prevent contamination of wholesome water.

Advance notice for installations

Advance notice must be given of installations.

Approved Plumbing Contractor benefits

Benefit from becoming an Approved Plumbing Contractor after passing the Water Regulations training course.

WRAS guide importance

WRAS has produced the guide to the Water Regulations, which is the essential guide for plumbers.

Image of the Water Regulations Guide cover

The Water Regulations Guide is an essential resource for plumbers.

Image of pressure gauge and flow rate testing at a sink

Visual representation of pressure and flow rate testing

Pressure refers to the force behind water flow. In domestic situations, a visual check is usually sufficient, but more accurate readings are needed when installing appliances like water softeners, combination boilers, unvented cylinders, or if pipework is being significantly altered.

Creating Pressure in Plumbing Systems

Pressure in plumbing systems can be created by fitting a pump (mains water is also pumped) or by the weight of water, known as the head.

The volume of water discharging to an appliance, measured in litres per minute.

Importance of flow rate

If the flow rate is poor, the bath would take longer to fill up.

Checking flow rate in domestic situations

A visual check usually suffices, but a flow cup or weir cup can be used for accuracy.

60 litres/min = 1 l/sec and 6 litres/min = 0.1 l/sec

Factors affecting pressure and flow

- Daily demand (peak periods) - Location - Age of property - Distribution main size - Incoming main size - Installation pipe size - Materials used - Number of elbows - Blockages

Diagram showing the water cycle, reservoir, water treatment plant, and water supply to a house.

The process of water supply involves the water cycle, collection in reservoirs, treatment at a water treatment plant, and distribution to homes.

A cold water system where all the cold water in the property is supplied directly to each outlet on mains pressure, which is high pressure.

The size of the service pipe to the house is usually 25mm MDPE, connected to 15mm copper in the house. Old houses may have 20mm MDPE copper or lead mains.

Precautions in a direct system

It is important to take precautions against backflow.

Diagram of a direct cold water system

Illustrates the layout and components of a direct cold water system, including the spherical ball type service valve and the cold feed to the hot water cylinder.

Direct system: The only stored water is for the hot water system via the cylinder.

In a direct system, the only stored water is used for the hot water system through the cylinder.

Only one DOV is required to drain the system down.

A direct system requires only one DOV to drain the system.

All pipework can be 15mm due to the system being high pressure.

The pipework in a direct system can be 15mm because it operates under high pressure.

Diagram of a direct water system

The diagram illustrates a direct water system with labeled components such as the cold water storage tank, expansion vent pipe, and direct hot water cistern.

Water Supply System Specifications Flashcards

Student preview

58 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Incoming mains requirements

Back

Ferrule/isolation, Meter/isolation

2.

FLASHCARD QUESTION

Front

Communication pipe depth range

Back

750-1,350mm deep

3.

FLASHCARD QUESTION

Front

Minimum diameter for service pipe

Back

25mm MDPE

4.

FLASHCARD QUESTION

Front

Rising main specifications

Back

15mm (min), Stop valve, DOV

5.

FLASHCARD QUESTION

Front

Diagram showing water supply system

Back

Illustrates the layout and components of a water supply system, including communication pipe, service pipe, and boundary stop tap.

6.

FLASHCARD QUESTION

Front

Water meters: Internal and external meters

Back

Internal meters need to be cross bonded for safety.

7.

FLASHCARD QUESTION

Front

Boundary meter box

Back

A boundary meter box is used for housing external water meters.

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