01329 848 144
07879 650 805
info@hmandv.co.uk
Policies
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Water

Home Services Water

As an approved member of WIAPS (Water Industry Approved Plumbers Scheme) and Thames Water Approved Contractor, we can facilitate the design and undertake the project management, construction and connection of water for domestic and commercial developments. Our team of engineers who are qualified industry specialists understand and are flexible to the developers needs, however complex and will plan the most cost effective programme to suit.

We can install all sizes of water pipe, be it for a domestic water, commercial building, new install or diversion around a new build. Pipe sizes from 20mm to 63mm can be installed by 2 methods which are moling or open trench, depending on the ground conditions (for pipe sizes 90mm above and above excavated trench will be required).

UTILITIES

  • Replacement Water Main/Services
  • Electro-fusion and Butt Fusion Jointing
  • Utility Ducting
  • Live water connections
  • Chlorination and Hydrostatic testing of new and existing water installations
  • Leak detection and repair, re-commission
  • Excavation and Trench Work
  • Geothermal heat source, underground pipe work installation (slinky installation)
  • Moling Services (Thrust Boring) Trench less pipe installation
  • Reinstatement to Highway Specification
  • Installation of domestic water services
  • Waste Water Installation
  • Tankering Services
COMMERCIAL

Water Leak

Damaged or corroded water pipe we offer a full service, leak detection and location. Excavation, repair, advice on pipe condition and suggest the best options.

Commissioning of new water pipes

All pipe work over 32mm has to be hydrostatic tested and chlorinated and bacterial samples taken. To BS6700 to meet water regulations (HM&V are accredited to carry out these works).

Domestic Water Supply Pipe Replacement

This is the pipe that supplies your property with water, the water company have an isolation valve in the public highway just off the boundary to your property, your water pipe is connected to this then the water pipe becomes your property and you are responsible for it.

If you have a leak or would like a lead replacement or your need your pipe work up sizing for a new central heating system, we  can help.

We can arrange to visit you and provide a free no obligation quotation for the works, along with being able to advise you on the best route for the new water pipe.

In most cases we would mole the new pipe in which would involve excavating launch and reception holes every 10 metres, this keeps disruption to a minimum and keeps re-instatement costs to a minimum. We can liaise with the water company for connection to their stopcock, we will make a ducted entry into your property and connect to the existing plumbing system. We will carry out any re-instatement that is needed.

Chemical Cleaning – Heating and Chilled Water Circuits

We are able to provide a service to chemically clean heating and chilled circuits. By introducing polymer dispersants and sequestrian agents to remove iron oxides and magnetite sludge that cause fouling and a reduction in efficiency for which a chemical clean will cure.

Following the chemical cleaning, proprietary corrosion inhibitors are added and in certain circumstances biocides, to prevent microbiological proliferation.
We offer the following services:

  • Chemical cleaning of heating and chilled water circuits
  • Acid descaling of hot water calorifiers and boilers

De-scaling Water Heaters

What causes limescale deposition?

Minerals in chalk or limestone rock collect as water permeates through the ground and collects in aquifers. These minerals remain within the water and are carried into the domestic water supply. They inevitably reach central heating and water systems, where they build up over time and cause blockages in pipework, efficiency losses and the premature failure of components. These problems can arise in both the primary water system (the central heating system) and secondary (household hot water) system.

The mineral deposits, collectively known as limescale, consist primarily of calcium and magnesium carbonates which are generally insoluble. Limescale occurs when these are deposited by heating water that contains soluble bicarbonate salts (which are thermally unstable and break down to form carbonates).

There are several factors that contribute to the build-up of limescale, including:

High (temporary) hardness
Elevated pH (alkalinity) of the water
Elevated temperature

Descaling:

Descaling is needed when a heat exchanger accumulates a significant thickness of calcium on it’s surface, enough to insulate the water from the heat source and impair performance.

This effect only occurs on heat exchangers that carry fresh tap water. Sealed systems such as radiator circuits contain a finite amount of calcium (typically 30 grams or so) that was contained in the initial fill of water, and once this has precipitated there is no more left to deposit. Fresh tap water on the other hand, can continuously deposit ever more calcium resulting in very thick layers of scale which can virtually seal off all water flow in extreme cases. Combi boilers and thermal stores (PulsaCoils, BoilerMates etc) suffer from this in particular. Symptoms can be reduced water flow, reduced temperature, wildly fluctuating water temperature, or any combination of these.

The answer is to either replace the heat exchanger, or pump descaling acid though it for an hour or two. It’s a much simpler procedure than powerflushing as only one item (the heat exchanger) needs attention. The powerflushing pump is set up and connected to the heat exchanger via the washing machine hot and cold taps usually, turned on and the scale gradually dissolved away. Once performance has been restored the equipment is disconnected and the chemicals flushed from the pipework simply by restoring the water supply and turning on the taps.