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Common phenomena of explosion-proof electrical equipment failure during use

SINO Testing Services

| 2020-06-22|Return

Explosion proof electrical equipment is electrical equipment that can be safely used in explosive hazardous areas.

However, explosion-proof electrical equipment may lose its explosion-proof ability after a certain period of use or due to original defects, leading to explosive accidents. The common phenomena are as follows:

01 Explosion proof shell corroded and damaged. The protective casing of explosion-proof electrical equipment loses its original strength due to corrosion caused by surrounding media, rust penetration, structural deterioration, etc., resulting in the loss of explosion-proof ability of explosion-proof electrical equipment.

02 Explosion proof protection shell electrochemical corrosion damage. The metal casing is charged in situations such as electrical leakage and potential drift, and the contact between the charged metal and the air medium is equivalent to the reaction of the battery, causing the metal casing to corrode. Causing electrical appliances to lose their explosion-proof ability.

03 External force and mechanical impact damage. Damage to the protective casing caused by collisions with other equipment and mechanical materials at the work site, as well as damage to the casing caused by unreasonable force during installation.

Shell fracture and damage caused by excessive temperature. Damage to the protective casing caused by shell fracture due to cold shrinkage deformation of the protective casing material structure in cold regions due to climate adaptation issues.

Damage caused by unreasonable installation. Damage, loss, and loss of protective function caused by non-compliance with installation requirements during the installation of explosion-proof electrical equipment.

06 Unqualified sealing, inadequate handling of sealing materials during installation and maintenance, loose sealing surface joints, damage to sealing components, inappropriate or missing sealing fixation and fasteners, and other factors result in a lack or weak explosion-proof performance.

07 Electrical equipment has quality issues with explosion-proof itself, with substandard explosion-proof shell materials and unreasonable structural forms that result in inadequate load-bearing capacity; Internal wiring facilities are prone to loosening, and unreasonable internal circuits can easily ignite or heat up; Unreasonable mechanical structural components, high equipment temperature, and internal water accumulation may cause malfunctions in explosion-proof electrical equipment.

Due to the actual changes in the hazardous area caused by changes in production facilities, the electrical equipment in this area was not updated to explosion-proof equipment in a timely manner.

09 Explosion proof electrical equipment selection error. Intrinsically safe electrical equipment uses non intrinsic safe voltage and increased safety enclosures for generating light, heat, and other line equipment.

As the end user of explosion-proof electrical equipment, it is necessary to regularly inspect these devices even if they are installed and used in explosive hazardous areas. This is not only a requirement of various safety supervision departments, but also a high emphasis on the safety of personnel and property.

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