What is a Central System?

It is quite simply, a pumping system, frequently combined with a heater, placed in a location that is usually some distance from where the actual washing takes place.  This is done for several reasons.

A central unit, like a portable machine, requires electrical power and water. If it is combined with a natural gas fired heater, it also requires venting through the ceiling and a supply of natural gas. Because the washing occurs in other areas, the system does not need drainage. This allows installation in equipment rooms, lofts or any convenient place where the equipment does not interfere with production.

The high pressure water (usually between 1,000 and 2,000 psi) leaves the pumping unit and travels through a network of schedule 80, galvanized pipe to the areas where high pressure water is needed.

The termination point of the pipe is a vertical drop approximately five feet from the floor. A high pressure ball valve and quick disconnect nipple are mounted at that point. A bracket may be used to hold the hose, gun and chemical jug.

How does it work?

The system is controlled by an automatic start/stop circuit which is basically a flow switch wired to the motor starter. The operator connects his high pressure hose/gun Combination to the ball valve. The ball valve is opened and the operator pulls the trigger on the gun. The flow Switch senses a movement of water and signals the starter to start the motor.

In systems with a heater, the flow switch also engages the heater. The entire process usually takes place in less than a second, depending on how much pipe is in the distribution system.

By using a dual lance or shower head nozzle and a down stream injector, chemicals are drawn from a reservoir at the ball valve station. This allows the operator to wash and rinse without returning to the ball valve or engaging any controls. The operator makes only one complete trip from the station and back. A timer automatically shuts off the system if no high pressure water is called for after 15 to 20 seconds. This delay is used to prevent too numerous starts and stops with a multiple gun system.

Because the central system is not moved from place to place, it offers larger flow/pressure combinations. Many central systems produce enough water to support several guns simultaneously. In this case, a second flow switch controls the heater to heat only the water being used. A six gpm system will use nozzles sized at three gpm for each of the two guns. If only one gun is being used in a dual gun system, only half the maximum output of the heater is used.

The method of heating the water is more flexible than with portable units. Natural gas is very popular. The initial cost of installation is more expensive but the long term cost savings are substantial.

The use of an electric heat exchanger is also popular, since no fuel source is required and venting is unnecessary. This system can be installed anywhere.

We are the preferred supplier for high pressure washing equipment to:

  • Skydome, 12 electrically heated units supplied over 30 stations.

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