United Siegen Philippines Corp. (SIEGEN) is an all-in-one industrial contractor and engineering solutions provider in the Philippines, specializing in storage tank manufacturing, industrial fabrication, and turnkey project execution. With over 30 years of combined industry experience, Siegen delivers end-to-end engineering, fabrication, installation, and maintenance services for diverse industrial sectors nationwide.

As a trusted industrial fabrication and engineering services company, our core expertise includes the design and custom manufacturing of above-ground and underground storage tanks for oil & gas, petrochemical, chemical processing, water treatment, sludge handling, food processing, and biofuel applications.

Our comprehensive capabilities include:

• Engineering design and project management
• Industrial steel fabrication and welding (SMAW, FCAW, GTAW, GMAW)
• Field erection and mechanical installation
• Steel detailing and structural fabrication
• Painting, coating, and sandblasting
• Tank repair, inspection, calibration, and maintenance
• Plasma cutting, rolling, bending, and grinding
• Turnkey EPC and field installation services

Building from the inside out, we prioritize structural integrity, engineering precision, and long-term performance in every project we undertake.

From its founding, Siegen has operated on four fundamental principles:

1. Honest and ethical business practices
2. Continuous improvement (Kaizen)
3. Respect for all people
4. Faith-driven leadership and servant-hearted service

While our technical expertise defines our capabilities, it is our culture that defines who we are. Guided by integrity, accountability, and a Christ-centered foundation, we strive to conduct business with excellence, professionalism, and genuine respect for our clients, partners, employees, and stakeholders.

At Siegen, we do not simply fabricate structures — we build trusted partnerships engineered for long-term success.

Siegen Philippines Corp.

Org chart

Teams

Offices