Shenhai Explosion-Proof
Prior to the assembly of explosion-proof electrical equipment, it’s essential for operators to verify the components being utilized, ensuring they comply with the designated design and assembly specifications.
1. Inspection of Self-manufactured Components
a. Quality Inspection
Each self-manufactured component must possess a valid inspection report or certification from the preceding manufacturing stage.
b. Visual Component Inspection
i. Components should be undamaged. Assembly is prohibited if there are any dents, cracks, or similar damage.
ii. Explosion-proof surfaces must be defect-free. If defects meet repair criteria, repairs are allowed, followed by re-inspection before assembly (repair requirements and methods are detailed in Section 2.5.2 of Chapter 2).
iii. Components must not exhibit any signs of dirt or rust. Parts with rust or paint on explosion-proof surfaces, or those that cannot be cleaned or coated with anti-rust grease, are not suitable for assembly.
c. Internal Inspection of Cavity Components
i. Cavities must be devoid of foreign materials. All debris, including metal shavings and fabric scraps, must be cleared prior to assembly.
ii. The cavity should be coated with anti-rust paint, and for explosion-proof parts, with arc-resistant paint. Coating must be applied before assembly if absent.
d. Inspection of Insulating Components
i. Verification of the insulating material grades (I, II, IIa, and IIb).
ii. Test report of the surface insulation resistance for plastic casings (not exceeding 10^9 ohms).
e. Movement Check of Moving Parts
Check the functionality of moving parts for smooth operation, ensuring they are not jammed or noisy.
1. Acceptance of Purchased Components
a. Qualification Verification
i. Purchased components must come with a manufacturer’s certification of conformity.
ii. The model and installation dimensions of these components must align with the equipment’s assembly requirements.
b. Visual and Internal Inspections
Inspections for purchased components mirror those for domestic parts.
c. Performance Tests
Tests for externally sourced components include:
i. Mechanical tests related to size and seal ring hardness, conducted through batch sampling.
ii. Electrical tests, including switch operation checks and sampling of aged electronic components.
iii. Insulation tests, similar to domestic components, with batch sampling.
Besides the aforementioned procedures, additional inspections for purchased items follow the same protocol as domestic items.
Regardless of whether components are domestic or imported, apart from batch testing, individual inspections of each item are mandatory.
Component verification is a critical process before assembling explosion-proof electrical equipment, vital for enhancing assembly quality, ensuring core functionality, and securing explosion-proof safety. This task demands high-level attention and precision.