Serious about Safety: Electrically-Conductive hoses
Why use Electrically-Conductive hoses ?
As material flows through a hose, molecules collide with each other. During the molecular collisions an electrical charge is generated. The potential electrical charge is influenced by a number of variables:
- Material being conveyed
- Length of the hose assembly
- Velocity of material transfer
- Material volume transferred
- Humidity and temperature
The build-up of an electrical charge can result in static electricity, which is an imbalance between negative and positive charges in the hose wall. If this charge increases to a point exceeding the dielectric strength of the hose material, arcing, which results in a spark, could occur.
To keep static electricity from building to a dangerous level, which may cause a fire or an explosion, the hose assembly must be connected to an earth ground.
Some materials that may be subject to electrostatic concerns include : Cyclohexane, Decalin, Diacetone, Dibutyl Ether, Dibutyl Phthalate, Dioctyl Phthalate, Freon, Hexane, Hydraulic Oil, Hydrazine, Hydrochloric Acid, Mineral Oil, N-Octane, Nitric Acid, Paint, Petroleum, Phosphate Ester, Steam, Toluene, Turpentine, Xylene, etc.
Non-Electrically-Conductive Rubber Hoses
If a rubber hose, made of non-conductive rubber is used, the electrical charge will accumulate in the wall of the hose and fitting. If the electric charge keeps accumulating until the potential difference between the charged hose assembly and the nearest conductive grounded object becomes high enough, the electrons will “jump” over, creating an spark (or arc).
Hose assemblies : Using a steel helix to assure electrical continuity is dangerous and not recommended. The helix can cause a leak path at the connection of the hose coupling and does not guarantee a 100% safe grounding solution. Some non-conductive rubber hoses use static wires for electrical continuity, as long as a solid contact is maintained between the wires and the hose end.
Electrically-Conductive Rubber Hoses
Electrically-Conductive Rubber Hoses are made out of electrically conductive rubber or thermoplastic compounds for tube and/or cover. This allows any electrostatic charge to convey directly and safely to the metallic end connections where charges can be grounded.
Full Electrically Conductive Rubber Hoses do not need to connect to the steel helix or static-wires, avoiding all risks during assembling. Electrically-conductive materials prevent static electricity buildup and arc discharge/sparks.
Goodall has developed an innovative line of Electrically Conductive Hoses to minimize the risk to you and your employees, thereby decreasing your liability and preventing devastating results. As with all hoses within the GOODALL family, our conductive hoses exceed international industry standards and conform to the established industry standards from Europe.