Systematic installation specification for waterproof cable sealing joints

1、Preparation for engineering pre-installation

Parameter matching verification

Perform a three-dimensional scan of the cable's outer diameter (with an accuracy of ± 0.05mm) to ensure that the interference fit between the inner diameter of the joint and the outer diameter of the cable is controlled at 12 ± 2%

Verify environmental adaptability: Establish an installation environment matrix (temperature gradient, vibration spectrum, chemical exposure level) according to IEC 60079 standard.

Tool configuration standards

• Laser wire stripper (incision flatness<5 μ m)
• Digital torque wrench (range 0-50N · m, accuracy ± 0.5%)
• Hot air gun (temperature control range 50400℃℃, adjustable wind speed)

2、Structured installation process

Step 1: Precision pre-processing

• Adopting non-contact laser wire stripping technology, retaining a 0.3mm transition layer when removing the outer coating layer
• The surface of the conductor is polished at the nanoscale (Ra ≤ 0.8 μ m) and coated with conductive antioxidant paste (thickness 15-20 μ m)

Step 2: Gradient Tightening Process

Pre assembly stage: Pre-fit the heat shrink tubing (shrink ratio 2:1) to the cable reference line position

Staged torque control:

• Initial tightening: Apply 30% of the nominal torque to eliminate assembly gaps
• Secondary tightening: increased to 60%, forming an initial sealing surface
• Final tightening: Achieve 100% torque value (refer to ASTM F837 standard)

Step 3: Dynamic stress control

Install a 30 ° guide angle stress relief sleeve 150mm away from the joint.

Implement layered bundling of multi-core cables (spacing ≤ 50mm)

3、Sealing performance verification system

Laboratory level testing

Pressure attenuation test: Maintain pressure at 0.5MPa for 30 minutes, pressure drop ≤ 3%

Salt spray test: 96-hour test according to ASTM B117 standard

Quick on-site verification

Fluorescent penetration testing: using UV-AD-7 leak detector, with a sensitivity of 10 ^ -5 mbar · L/s

Infrared thermal imaging: joint temperature difference under operating load ≤ 2.5 ℃

4、Digital installation management

Establish installation parameter blockchain file: including 3D torque curve, environmental sensor data, and operator biometric features.

Adopting AR assisted assembly system: real-time projection of tolerance range (± 0.1mm), automatic warning out-of-tolerance risk.