Original Title: Water Treatment
About waterjet waterjet treatment includes two parts: waterjet cutting water and waterjet cooling water. In this article, I will introduce these two parts separately.
Water Quality and High Pressure Equipment
The quality of the water used by any abrasive waterjet plays a very important role in the life of certain critical components, such as: the nozzle orifice, on/off valves, seals, check valves and plungers. Most affected is the high-pressure nozzle orifice. To perform high quality cutting, the orifice needs to create a high quality jet that is directed through the center of the mixing tube. Contaminates in the water can create a multitude of problems for the orifice.
These contaminates can be classified into two groups, dissolved solids and suspended solids. Particles suspended in the water impact the edge of the orifice and can chip it. This results in poor jet quality, poor cutting capability and lowered mixing tube life. Solids that are dissolved can precipitate out of solution onto the entrance of the orifice. Over time a ring of the precipitate builds up around the orifice. Eventually, a portion of this ring breaks and damages the orifice or disrupts jet quality.
Water that is too pure also causes problems with high-pressure components. Since the water is so pure, a high potential exists for the water to dissolve materials that it comes in contact with. Thus excessive water treatment can be detrimental to components in the high-pressure water system.
A balance between pure water and untreated supply water needs to be arrived at. Ultimately, the cost of water treatment must be compared to the costs resulting from shortened component life and cutting equipment downtime. The local water supply should always be tested prior to the installation of any waterjet cutting system. This permits an appropriate water treatment system to be selected and installed. Required water treatment may range from nothing at all to simple filters, a small water softener or a small reverse osmosis system.
Producing high pressure water will always result in warm water, as the energy in the water is converted to heat. In addition, many machine shops are without air conditioning, and other machines are running, increasing the temperature of the shop.
All of this means that if you are recirculating your water, it can quickly get too warm. The warmer the water, the more wear will occur on the pump. Water provided to the pump should be less than 70° F (21° C).
In particular, the pump seal life shortens with water temperatures above 70° F (and the higher the temperature, the shorter the pump life).
If you have a closed loop system, you should use a Chiller System to keep the temperature below 70° F, to avoid accelerating the wear on your high-pressure pump.
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