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Fluid Air

Air and Fluid Hoses

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What is the life expectancy of my hose?

HELP – Hose Expected Life Predictor. A guide to explain the factors used in choosing paint hose materials. Click here.

Can I mount the electrostatic air hose to a reel mounted on a trolley cart which is grounded. Do I need a grounding wire at the gun to prevent paint from coming back to the painter holding the gun?

Gun grounding to the hose reel is required. The grounding of the reel and the pump is more critical. You need to ensure a wire is run from the base of the reel to the cart and a separate wire ground be run from the cart to a structural ground point.

How do I care for heated hoses?

A heated hose is an electrical product and should be handled as such to prevent damage.  Some best practices to reduce hose damage include:

  1. Use the correct amount of hose for the system.  Too much hose can cause the hose to drag on the floor, be stepped on, or otherwise damaged.
  2. Use 470 to 550 lbs. in force to attach hoses to applicators, pumps or accessories.  Over tightening can cause the wires to crush, shorting out the hose.
  3. Use hose support springs and straps to prevent the hose cores from kinking.
  4. Allow the hose to heat up, once it has been filled with material, before trying to flex it.


  1. Do not pull or stretch the hose.  This can lead to wires becoming loose and shorting out the hose.
  2. Do not twist or torque the hose as this can cause the heating wires to cross, creating a hot spot and burning out the hose.
  3. Do not clamp or use tie wraps to support hoses.  These can cause a bend point in the hose which can cause hose core damage when the hose is at temperature.
  4. Do no cover or tape the hose assembly.  The hose is designed to release excess heat.  Insulating the hose by wrapping it can cause the hose to over heat or short out.
  5. Do not over-bend the hose as this can cause a stress point on the hose, leading to hose core damage.
How do I back flush the fluid hose to my pressure pot and why should I do this?

The cost of many modern coatings is in the area of $100 per gallon or more. If one can recover the coating from the fluid hose before flushing the hose with solvent, the amount of money saved can be considerable over a period of time. A 25 foot length of 5/16” fluid hose contains approximately 12.7 fluid ounces. Flushing the hose 10 times would waste (or save) about 1 gallon of coating.

Safety warning: DO NOT use the following method to flush out high pressure equipment. This method is designed to back flush operations using pressure pots.

Typical recommendations for back flushing a pressure pot are to hold a rag tightly over the air cap with the fluid pressure off and the air pressure on. (See illustration 1)

Illustration 1

Illustration 1

Note that the tank pressure has been relieved and the tank is open to atmosphere either by opening the tank vent or leaving the tank lid ajar.

Holding a rag against the air cap with air cap in “operating” position results in no fluid being back flushed (see illustration 2). The rag not only blocks the center annular hole of the air cap, it blocks the fluid tip opening preventing the air from entering the fluid tip.

Loosen the air cap retaining ring approximately two turns before applying the air pressure. (See illustration 3). This position raises the air cap above the fluid tip allowing the air to flow into the fluid tip, pushing the coating back to the pressure pot.

Illustration 2

Illustration 2


Illustration 3


Back flushing your fluid lines results in lower coating costs, lower solvent costs and lower disposal costs.