Safety Expert for Oil Storage & Transportation

Anti-static measures

Oct 10,2020
Anti-static measures

(1) Use conductive materials. Materials with a resistivity of less than 105Ω·m generally do not accumulate static electricity.

(2) Reduce frictional resistance, such as using pipes with a large radius of curvature to limit the flow rate of electrostatic liquid in the pipe to prevent splashing and impact.

(3) Increasing the environmental humidity can increase the leakage of static electricity along the surface of the insulator.

(4) Grounding is an effective way to eliminate static electricity on the conductor, simple, reliable, and low cost.

Anti-static grounding

Grounding is the simplest and most commonly used method to eliminate static electricity disasters, and its types include the following three.

(1) Direct grounding, that is, conducting a conductive connection between the metal conductor and the ground, so that the potential of the metal conductor is close to the ground potential.

(2) Indirect grounding, that is, in order to electrostatically ground the electrostatic conductor and electrostatic voltage conductor outside the metal conductor, all or part of its surface is tightly connected with the grounded metal conductor, and this metal is a type of grounding electrode.

(3) Jump grounding, that is, structurally fix metal objects through mechanical and chemical methods, so that two or more mutually insulated metal conductors are electrically connected to establish a low-impedance path that provides current flow , And then ground a type of grounding. 

Ground object

Usually there are the following types of grounding objects.

All equipment and pipelines used to process, store and transport various flammable and explosive liquids, combustible gases and combustible dust, such as oil tanks, gas storage tanks, oil transportation pipeline devices, filters, adsorbers, etc., must be grounded. If the bag filter is made of textile or similar. It is recommended to use a metal wire to pass through the seam and ground it; if the pipe is made of non-conductive material, wire a metal wire outside or inside the pipe and connect the wire to the ground.

For mobile equipment, such as automobile tankers, train tankers, oil tankers, trolleys, and mobile containers, special grounding joints such as jaw clamps or bolts should be installed in safe places to make the mobile equipment well-grounded and prevent the accumulation of charge on mobile devices. When the tank truck and oil tank truck are in place, stop the brake and close the circuit. Before opening the tank lid, ground it first, and at the same time, ground the crane pipe and other movable parts separately. After the oil filling is completed, remove the oil pipe first, and after a certain period of time (usually 3min~5min or more), the ground wire can be removed. A dedicated grounding soft copper wire (or conductive rubber drag strip) should be installed on the automobile tanker, which shall be firmly connected to the tanker and hung on the ground to conduct away the static electricity generated when the automobile is running.