Annexure A

The ESSNA™ H59™ station or ESSNA™’s™ scope of a retrofit strictly adheres to the SAE J-2719 standard, with consistent reliable on-spec Fuel Cell Standard purity of 99.97% and CO < 0.2 ppm. Our system ensures hydrogen meets the quality requirements necessary for fuel cell vehicles. ESSNA™ owns a purification technology that outperforms PSA (pressure swing adsorption) and meets the required fuel cell standards.

The ESSNA™ H59™ station or ESSNA’s™ scope of a retrofit will be designed to meet SAE J2601-2 standard and complies with ISO 19880-1, providing safe and efficient fueling protocols for heavy-duty hydrogen vehicles. The station features HD Dispensing Capability at 700 Bar (H70) and a compression capacity to meet operational objectives. The control parameters relating to fueling such as fueling speed, pre-cooling class, and final pressure are to be determined, ensuring safe hydrogen transfer. The station may support higher flow rates, up to 120 grams per second (g/s), to accommodate the larger fuel requirements of heavy-duty vehicles. The system may be designed to achieve fueling times of less than 20 minutes for larger vehicles with compressed hydrogen storage systems (CHSS) up to 70 kilograms. Compliance with J2601-2 standards for 700 bar (H70) fueling as well as ANSI/CSA-HGV 4.1 (ETL) will be demonstrated through fuel logs. Hot and Cold case scenarios are implemented to guarantee optimal performance under varying environmental conditions, preventing overheating and overfilling during refueling. Included components are confirmed / estimated to be hydrogen compressor and associated hydraulic unit, internal high-pressure storage pack, hydrogen heat exchanger, integrated dispenser, and hydrogen flowmeter.

We would deliver the following in designing and building a station (1) implementation of SAE J-2799 communication protocols to ensure 95–100% SOC fueling (state of charge), (2) the presence of a point-of-sale or data-logging system, and (3) design adaptability to various configurations and pressures suitable for medium, heavy and light-duty vehicles. Implementing and installing a main electrical disconnect, nitrogen distribution panel, hydrogen-distribution sequencing instrumentation/valve panels, and safety devices (flame detection, hydrogen gas detection, emergency-stop buttons, and pressure, temperature, and flow monitoring). The station will also have warning red strobe lights and audible horns for abnormal conditions. Additional components include the main electrical power and control enclosure with a dedicated HMI for on-site monitoring and station control, the process PLC and safety system, and a nitrogen distribution panel with automatic switching between primary and secondary nitrogen sources. Added: Functional safety lifecycle per IEC 61508/61511 with SIL assignment for safety instrumented functions (SIFs); hazardous-area electrical compliance per IEC 60079; and a documented compliance program (inspection, testing, maintenance) with audit intervals ≤ 12 months, including HAZOP/FMEA in line with ISO 19880-1 Annex G.

ESSNA™ H59™ station or to meet the SAE J2601-1 standard and complies with ISO 19880-1, providing safe and efficient fueling protocols for light-duty hydrogen vehicles. Optional integration.

Safety instrumented systems shall comply with IEC 61508/61511 lifecycle requirements. SIL targets will be assigned, validated, and verified using quantitative risk assessment; SIF proof-test intervals and diagnostics will be documented.

Cylinders, piping, and composite storage shall use materials compatible with hydrogen service and embrittlement resistance; fabrication and testing shall comply with ISO 11114, ISO 11120, and ISO 15869.

All electrical/electronic equipment within classified areas shall meet IEC 60079 requirements for selection, installation, and protection methods (e.g., Ex d, Ex e, Ex i).

Portable and transportable hydrogen storage systems shall meet ISO 16111 (metal hydride), ADR, and DOT CFR 49 requirements for packaging, relief devices, and safe carriage.

Perform HAZOP and FMEA per ISO 19880-1 Annex G; maintain a formal inspection, testing, and maintenance program with audit intervals not exceeding 12 months. Maintain quality and environmental controls per ISO 9001 and ISO 14001.