Electrically Conductive Hose: At Masterflex Technical Hoses Ltd we design, produce and supply an innovative line of flexible electrically conductive hoses; helping to lessen personnel risk and prevent devastating results; Most Masterflex electrically conductive hoses are suitable for use on ATEX approved equipment. Masterflex has Flexible Ducting Hose Range, manufactured from either PVC, PVC/EVA, Polyurethane, or PTFE, for electrically conductive applications; ideal for temperatures up to +270°C and available in sizes 25mm to 900mm diameter (dependent on type).
WHY USE ELECTRICALLY CONDUCTIVE HOSES?
As media flows through hoses, particles collide, there is a generation of electrical charge. This generation, of electrical charge, is influenced by several variables:
- The material conveyed through the hose
- The length of the hose assembly
- The velocity of material transfer through the hose
- The material volume transferred through the hose
- The humidity and temperature within the hose
Static electricity is the result of an imbalance between negative and positive charge; if this charge rises to a point, surpassing the dielectric power of the hose material, sparks are likely to occur.
Examples of materials that are likely subject to electrostatic concerns: Flammable liquids, various industrial solvents, alcohol, plasticiser, aerosol-propellant/refrigerant, petrol-based media, hydraulic oil, foaming agents, paint, petroleum, phosphate ester, paint thinners, various solvents, etc. Fine dust particles, such as of wood dust and flour and solids such as certain types of plastic pellets, are also common examples of media that are subject to electrostatic concern or explosions. To keep static electricity from building to dangerous levels, a level enough to cause a fire or an explosion, electroconductive hoses need to be in use.
WHY DO NON-ELECTRICALLY-CONDUCTIVE HOSES CREATE SPARKS?
In the wall and fittings, of non-electrically-conductive hoses, electrical charges can accumulate. With the continuous increase of electrical charge, till the potential difference between the charged hose assembly and the nearest conductive grounded object grows high enough, the electrons will jump over and produce a spark.
HOW CAN ELECTRICALLY CONDUCTIVE HOSES PREVENT SPARKS AND EXPLOSIONS?
Electrically-Conductive Hoses, used in applications requiring the prevention of sparks and explosions, are constructed using electrically conducting materials or thermoplastic compounds. This type of construction, providing the hose is connected to ground via the equipment to which it is connected, allows electrostatic charge to convey directly to ground. Fully Electrically Conductive Hoses, for eliminating the risk of static electricity build-up and sparks, do not rely on the connection of the steel helix or static-wires. It is however recommended that if the hose contains a steel helix, to ensure static dissipation, it also needs to be ground.