As fleets and stations shift toward renewable natural gas (RNG)—a cleaner, carbon-negative fuel—existing CNG infrastructure must be upgraded accordingly. A well-executed CNG compressor retrofit ensures compatibility, safety, and optimal performance with RNG or biogas. Here are 7 essential steps to retrofit your compressor effectively.

1. Assess Compatibility with Biogas Quality

RNG often contains moisture, CO₂, and trace contaminants. First, evaluate your current compressor’s ability to handle wet gas and impurities. Upgrading or replacing gas dryers and filtration systems from Keep‑Win’s Dryers & Filters product line is crucial to protect downstream components and maintain gas purity.

2. Upgrade Sealing & Elastomer Materials

RNG demands robust seals and elastomers compatible with variable gas chemistry. Retrofit plans should include stainless-steel fittings, upgraded seal kits, and high-grade O-rings—available through Keep‑Win’s Seal Kits & Elastomers catalog—to ensure longevity and leak-free integrity.

3. Install Enhanced Dryers and Moisture Control

A dewpoint-optimized dryer is necessary to remove moisture before compression, preventing corrosion and wear. Consider Keep‑Win’s dual-stage drying systems in the Advanced Compressors & Accessories section for consistent gas quality.

4. Incorporate High‑Pressure Booster Upgrades

If higher outlet pressure is needed—for example, above 250 bar—add a high-pressure booster stage. Keep‑Win’s Natural Gas Booster Compressors lineup offers modular retrofit kits to ensure reliable RNG injection into high-pressure storage systems.

5. Integrate Smart Controls & Remote Monitoring

Upgrade compressor controls for RNG-specific operation. Enhance your system with Keep‑Win’s Smart Control Cabinets featuring PLC-based controls, telemetry, and auto shutdown capabilities in case of process anomalies or leaks.

6. Validate with Factory Testing & Safety Certification

Once retrofit kits are installed, conduct Factory Acceptance Testing (FAT) to ensure mechanical integrity, gas valves, and detection systems meet required safety standards. Keep‑Win’s certified retrofit solutions come with pre-shipment testing and full compliance reports.

7. Roll Out and Train Staff

Proper operator training is essential. Ensure staff understand the characteristics of RNG, new control interfaces, maintenance routines, and emergency procedures. Keep‑Win supports this with on-site commissioning and training services.

✅ Why Retrofit Instead of Replace?

• Cost-efficient: Retrofit costs are often 30–60% lower than full replacement.

• Weniger Ausfallzeiten: Modular kits reduce field installation time and avoid major civil works.

• Fuel flexibility: Supports both conventional CNG and RNG.

• Sustainable solution: Enables cleaner, carbon-negative operation using RNG.

🧩 Keep‑Win’s Retrofit Solution Kit

Keep‑Win offers turnkey RNG retrofit packages, featuring:

• Stainless steel piping, seals, and elastomer kits

• High-capacity dryers and moisture control units

• High-pressure booster stages for RNG

• Smart control cabinets with remote monitoring and safety interlocks

• Factory FAT, site commissioning, and operator training

These retrofit kits allow operators to adapt existing infrastructure to RNG with minimal disruption, greater versatility, and unmatched reliability.

Retrofitting your CNG compressor for renewable gas is not just a technical upgrade—it’s a strategic move toward sustainability. By following these seven essential steps and leveraging Keep‑Win’s product lines, your station can successfully handle both CNG and RNG, reduce emissions, and boost operational efficiency.

👉 Ready to retrofit? Kontakt Keep‑Win today to get a customized RNG retrofit plan and product recommendations from our expert team.