Dear Sir
We are requesting your best proposal for a Hard Chrome Plating Line for the repair of hydraulic cylinders.
The estimated dimensions of the cylinders, as well as the approximate calculation of the surface area and capacity of the grinder, are detailed below.
A complete installation is required for all stages of the process, as well as a proposal of materials for commissioning.
1. Process Steps
• Part Preparation
• Electroplating
• Post-treatment
2. Chrome Plating Tank Type: Vertical
3. Technical Calculation For Rectifier Sizing
a) Estimated Surface Area (per cylinder)
• Length: 1,000 mm
• Diameter: 100 mm
• Lateral surface ≈ π × D × L ≈ 3.14 × 100 × 1000 ≈ 314,000 mm² = 0.314 m² = 3140 cm² = 31.4 dm²
b) Recommended Current Density
• Recommended for hard chrome plating: 50 A/dm²
c) Total Current Required
• Current = 31.4 dm² × 50 A/dm² = 1,570 A
For safety margin, consider ~1800 A.
RECOMMENDED RECTIFIER SPECIFICATION
Parameter Recommended Value
Output voltage (DC) 0 – 12 V (adjustable)
Output current 0 – 1800 A (adjustable)
Pure or pulsed DC waveform (preferred for quality)
Control mode Constant current and constant voltage
Refrigeration Liquid forced (ideal) or air forced (minimum)
Control Digital, with programming interface and timers
Stability ≤ ±1%
Power factor ≥ 0,95
Certification CE, ISO 9001
Security Protections against overcurrent, overvoltage, etc.

Information for quotation:
- Quantity: 1 unit (with the possibility of future purchases)
- Delivery terms: CIF Luanda, Angola.
- Estimated production and dispatch times
- Payment terms
- Validity of tender
- Inclusion of technical catalogue, certificates and guarantee terms