Project Background

A steel mill's 30,000 Nm³/h air separation retrofit project. The original domestic compressor could not meet owner performance requirements after brief operation, requiring compressor replacement while maximizing reuse of existing peripheral systems.

Technical Solution

Domex-E supplied a Siemens Energy® GC series standard unit with layout adaptations for site conditions. The engineering team conducted multiple pre-project site visits, optimizing the layout to balance standard unit performance with existing infrastructure constraints.

Project Results

Project execution and on-site installation earned owner commendation. Unit performance improved 14.3% over the original machine, with retrofit costs recoverable within two years.

Project Background

A steel mill's 35,000 Nm³/h air separation retrofit project. The owner's aging domestic unit had severely degraded efficiency and urgently needed upgrading. Domex-E prepared and refined multiple retrofit proposals during the project phase, ultimately determining a full unit replacement.

Technical Solution

As an energy efficiency retrofit, the owner faced significant energy compliance pressure. During shipment through commissioning, pandemic restrictions created major challenges. Domex-E service personnel persevered through lockdown difficulties alongside the owner and related parties to keep the project on track.

Project Results

The unit delivered 16.7% energy savings, exceeding customer expectations. After project completion, the owner commissioned Domex-E for a second retrofit of an equivalent-scale unit. Phase II successfully started up in 2025, meeting all energy efficiency targets.

Project Background

A 45,000 Nm³/h air separation feed air compressor project in the nonferrous industry. With surplus but unstable steam available, the owner adopted an innovative steam-motor dual-drive configuration with power generation — the first such Siemens Energy® compressor project in air separation.

Technical Solution

Domex-E completed the main unit combination design based on owner operating conditions, with Siemens Energy®'s engineering team handling all detailed design. Steam turbine and motor switch via clutch; during turbine drive, the motor can generate power externally at 9,900 kVA capacity.

Project Results

This project became a new benchmark for energy integration in air separation. Domex-E simultaneously completed main scheme designs for a series of small-to-medium steam-motor dual-drive units applicable to broader steam and power optimization needs.

Project Background

An overseas steel industry medium-pressure nitrogen booster train on an island with limited transportation and supporting infrastructure, where the owner placed high value on supplier technical capability and engineering solution expertise.

Technical Solution

To facilitate export transport and reduce overseas site work, Domex-E performed its first full skid packaging design, assembly, and supply of a Siemens Energy® GV series custom compressor. Per customer request, a Domex-E proprietary compressor PLC control system was included.

Project Results

After port arrival, on-site installation and startup were completed in under one month — more than two-thirds faster than conventional timelines — among the fastest GV series installation and commissioning projects on record.

Project Background

An industrial gas project adopted reference-design unit standardization with 6 trains — STC-GC(100-3), STC-GC(265-3)×3, and STC-GV(10-4-H)×3 — addressing full-lifecycle O&M and spare parts assurance requirements.

Technical Solution

Through reference-design standardization, all 6 units share spare parts and O&M resources, effectively reducing the owner's full-lifecycle maintenance costs and improving equipment assurance capability.

Project Results

After commissioning, all units operated stably with performance meeting contractual guarantees, earning high owner recognition.

Project Background

Domex-E's first deployment of Hangzhou Steam Turbine (HST) paired with Siemens® compressors, addressing multi-host system integration and full train commissioning requirements.

Technical Solution

The project team leveraged full system integration capabilities to coordinate interfaces, control logic, and commissioning across steam turbine, compressor, and auxiliary systems.

Project Results

After commissioning, the unit operated stably with all performance metrics meeting design requirements, successfully validating this technical approach and providing a proven reference for future similar projects.

Project Background

One month before delivery, an accident during second-stage impeller brazing at Siemens® Germany damaged both units' second-stage impellers simultaneously, preventing planned compressor assembly and creating major delivery delay risk.

Technical Solution

Domex-E immediately convened Siemens® Germany, the Huludao assembly base, and site parties for emergency coordination. The contingency plan: Unit 1 shipped without second-stage rotor installed to keep both main units positioned, foundations aligned, and site piping on schedule; Unit 2 shipped fully assembled for on-site replacement; Unit 1 returned to Huludao for second-stage rotor installation and reassembly. The team optimized manufacturing, transport, installation, and commissioning sequences across Germany, Huludao, and site resources.

Project Results

Both nitrogen compressors completed installation, commissioning, and successful startup per the owner's original schedule, meeting overall project timeline targets and demonstrating Domex-E's comprehensive execution in emergency response, cross-regional resource coordination, and complex project delivery.