Irrigation

SPRINKLERS:

  • Static spray nozzles (Rainbird) – cover a distance of 1,2m to 5,5m – variable arc spray from 4 degrees to 360 degrees – fit onto PVC stand pipes and pop ups used for small beds and lawn areas.
  • Rotary gear drive pop up sprinklers (Rainbird, Hunter, Pro Plus) cover a distance of 6m to 15m depending on pressure – used to cover medium and large lawn areas.
  • Pulsating bed sprinklers and pop up sprinklers (Rainbird) – cover a distance of 12m to 15m depending on pressure – used to cover large beds and lawns.
  • Microjet mister sprays to irrigate very small beds, planter boxes and pots.
  • Brass shrub static spray heads are durable and do not get damaged by dogs.

 

VALVES: various sizes

  • Brass ball and gate valves.
  • PVC ball valves – threaded and plain
  • Brass non return valves
  • Electronic valves (24V – 25mm) operate via an electronic timer – operated each irrigation zone automatically.
  • Heavy duty plastic and brass turf valves – quick couple to main line pipe to use hose of borehole or booster pumps.
  • Heavy duty plastic enclosures (6 and 10 inch round – rectangular 305×432 and 305×508 millimetres).

 

IRRIGATION TIMERS:

  • D.I.Y. applications: Timer and solenoid valves kits that simply attach onto garden tap:
    • Gardena single station battery operated timer, 6 way distribution timer.
    • Holman 2 and 4 station battery operated timer and solenoid valve kit.
    • Holman 2 and 4 station electrical timer and solenoid valve kit.
  • Electrical timers range from 2 stations upwards – Holman, Rainbird and Hunter – indoor and outdoor units.
  • Rain sensors available for any irrigation timer.
  • Transformers available to convert from 220V to 24V as all irrigation timers operate on 24V power supply.

 

IRRIGATION, PUMP AND PLUMBING FITTINGS:

  • Spray line grip fittings available in 15mm (blue), 20mm (green) and 25mm (black) – used for connecting irrigation piping (low density) to sprinklers and valves.
  • Nylon insert fittings range from 12mm to 50mm used for connecting pumps to low density class 6 piping using clamps.
  • Plasson fittings used for connecting high density/high pressure piping.
  • PVC fittings to connect PVC piping using PVC cement/glue.
  • Galvanised fittings used to form manifolds for irrigation valves, connecting brass valves to piping and pumps.
  • Conex fittings used for polycop piping.
  • Galvanized and PVC stand pipes (15 and 20mm – various lengths) for bed sprinklers and taps.

 

PIPING AND RELATED FITTINGS:

  • High density piping – various sizes and 6, 10 and 12 bar pressure rated – used for supply water from municipal supply points and pumps – under pressure all the time – use plasson fittings to connect and joint piping.
  • Low density piping – various sizes and 3 and 6 bar pressure rated – used for supplying water to sprinklers – not under pressure all the time – use sprayline grip fittings for irrigation use or nylon insert fitting for 6 bar rated piping.
  • PVC piping – various sizes – 12 bar pressure rated with PVC 12 bar rated fittings.

 

IRRIGATION SYSTEMS:

NEW INSTALLATIONS:

All irrigation systems are professionally designed and installed. Optimum coverage throughout the garden is guaranteed. The sprinklers are selected and spaced according to the design of the garden and plantation type so that the garden is evenly irrigated. Lawns and beds are irrigated separately so that watering is not effected during seasonal changes. High pressure piping (withstands 16 bar pressure) is used to supply water from the municipal water supply point or pump system to the irrigation control valves. In most cases we take the water supply from the closest point of the municipal water meter as the water pressure and flow is the best with no interruptions. The number of sprinklers per line depends on the water pressure and flow. The number of valves depends on the number of sprinklers per line in conjunction with water supply and pressure.

The automatic irrigation valves are buried in the ground and covered by a heavy duty plastic enclosure to prevent them from incurring damages due to weather conditions and outside interferences. The manual irrigation valves are situated at points in the garden that are easily accessible to operate the sprinklers manually without getting wet. Automatic timers are also situated in an easily accessible area. Low density piping 15mm, 20mm and 25mm are used to connect the sprinklers to their respective irrigations valves – The piping sizes are determined by the pressure and volume of the water, number of sprinklers and the distance of the sprinklers in one zone. All piping and cabling are buried atleast 300mm to 350mm deep.

There are two types of irrigation systems that can be installed in a garden viz

Automatic irrigation system:

An automatic irrigation system is made of an electronic timer, electronic valves, piping, cabling and sprinklers. The timer is linked to the electronic valves via cabling. The timer sends electronic pulses to each valve causing it to open in order to supply water to the related sprinklers. Irrigation piping is used to link the valves to the related sprinklers. The timer has the following settings:

  • Current date and time setting
  • Watering start times – can water 3 times a day
  • Watering days – can choose which days to water
  • Station run times – set watering duration times for each section
  • Manual operation – single station or entire watering cycle
  • Back up battery – when there is a power failure, the set memory is maintained.
  • Rain sensor – optional – automatically switches timer off when there is too much rain – assists in saving water.

 

Manual irrigation system:

A manual irrigation system is made up of brass valves that are opened and closed manually in order to supply water to the sprinklers. This is a cheaper option as the system is operated manually and does not consist of any electronic components.

REVAMP OR REPAIR EXISTING IRRIGATION SYSTEMS:

Irrigation systems that do not operate efficiently and effectively are either not monitored or maintained over a long period of time or have not being installed professionally. The following problems can be detected on these systems:

  • Lack of sprinklers throughout the garden – causing dry patches.
  • Incorrect sprinklers types and sizes causing irregular watering.
  • Damaged pipes, control valves and sprinklers causing leaks throughout the garden – unnecessary water wastage.
  • Sprinklers not positioned according to garden design and plantation type result in either too much water in certain sections and little to no water in other section of the garden.
  • The number of sprinklers selected for each does not match the water volume and pressure of the supply point resulting in either low pressure – coverage is not optimum or too high pressure causing fittings and sprinklers head to pop out.
  • Plants have overgrown the sprinklers and therefore block the spray of the sprinklers causing damp and dry spot throughout the garden.
  • Sprinklers irrigating lawns and beds simultaneously – problematic during seasonal changes as the lawns and beds require different amounts of water.

 

Our contractors evaluate problematic irrigation systems in order to determine all problem areas which are then rectified so that the system operates efficiently. Some irrigation systems are completely damaged or very poorly installed and have to be redesign and installed to meet the watering requirements of the garden efficiently. During revamping of irrigation systems, we incorporate the existing materials that are still in good working order. All damaged components are replaced.

SERVICING IRRIGATION SYSTEMS:

It is important that irrigation systems be maintained on a periodical basis in order to prevent unexpected and costly repairs. The following checks are carried out when servicing an irrigation system:

  • Check timer is operational.
  • Check that the timer is set according to the watering requirement of the garden.
  • Check that the irrigation valves are operational and there are no leaks.
  • Check all piping for leaks or blockages.
  • Check that are sprinklers are operational, spray in the correct direction and are not blocked.
  • Check that the spray of the sprinklers is not blocked by tall plants.
  • Check that there is optimum coverage throughout the garden.

 

If any problems are detected, they are rectified immediately before the problem gets bigger.

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