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.
