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The paint pressure tank (SYNO: paint pressure pot, paint agitator tank) is a container in which material/fluid is stored, pressurized and forced to flow through a fluid hose to a spray gun (pressure feed spray gun) or to another coating device. Air pressure from a compressor provides a controlled pressure to the fluid (example: if the air pressure is set at 20 psi, then the fluid pressure will be 20 psi).

How to Choose the Right Paint Pressure Tank?

  • Chemical Resistance: Paint pressure pots are made of either stainless steel or inexpensive galvanized/painted steel. In general, galvanized tanks can be used for a wide range of solvent-based paints and coatings. However, if water-based coatings, acids, or aggressive fluids are applied, stainless steel should be used.
  • Maximum pressure:The unit should be rated for slightly higher pressure than the maximum allowable pressure Note: Always use a safety relief valve.
  • Air and Fluid Connections: The size must fit the spray gun adapter and the air adapter from the compressor. The size is usually either 1/4″ or 3/8″.
  • Local Regulations: Comply with local safety codes and regulations, such as ASME certification and NFPA standards in the U.S.

FAQ: Frequently Asked Questions

Can I leave paint in a pressure pot?

It is not advisable to leave paint in the pressure pot. Once the paint dries, certain parts may become clogged with paint (e.g. the fluid pipe or material outlet).

Can you spray latex paint with a pressure pot?

Yes, in principle it is possible to use a pressure pot to spray latex. When spraying latex or other higher viscosity materials, it is more important to choose the right spray gun (i.e. the right size fluid tip and air cap).

Used Paint Pressure Pots/Tanks: What to consider?

Paint pressure pots are generally rugged and strong. And there are few moving parts (e.g. pressure gauge or air motor if equipped with an agitator) that can break. Therefore, it may make sense to buy a used or 2nd hand paint pressure pot, especially if it is made of stainless steel (SUS). In addition to the above requirements, the following should be considered:
  • Main Gasket: This is the black rubber gasket that seals the pressure tank body from the lid. Since opening the tank (=removing the lid from the body) is a common procedure when filling or removing fluids, this gasket can fail after a while. If it is a pressure tank from a reputable manufacturer such as Graco or Binks, it is easy to find a replacement. If it is a no-name brand from a low-cost alternative supplier, it is more difficult. There is always the option of buying a black rubber sheet and cutting out a gasket.
  • Air Pressure Regulator and Gauge: This part can also fail. However, this is a standard part that can be easily purchased at hardware stores.