Mechanical Design Engineer (HVAC​/R & Plumbing) - NDBS

About Kelso Industries

Kelso Industries employs 3,500+ professionals across 30 companies, delivering exceptional HVAC, mechanical, plumbing, refrigeration, and electrical solutions nationwide. Join us to grow your career and be part of a team where innovation, excellence, and safety come first.

National Design Build Services (NDBS) is a mechanical design/build firm offering expertise in designing air conditioning, heating, ventilation, and refrigeration systems (HVAC/R) for commercial and industrial buildings. Our projects include Healthcare, Food Processing, Manufacturing, Warehouses, Office Buildings, and Refrigerated Warehouses.

The Mechanical Design Engineer – Hydronics & Process Piping is a key technical role at NDBS, responsible for the design and engineering of hydronic systems, industrial piping networks, and HVAC/R mechanical infrastructure from concept through construction. This position focuses on piping system design, fluid distribution, equipment integration, and field coordination in complex industrial and commercial environments. You will work closely with field teams, project managers, and preconstruction staff to ensure piping and hydronic systems are engineered for constructability, efficiency, and code compliance.

• Position Type:
  Full Time
• Travel Required:
  
  15%
• Department:
  Engineering
• Location:
  
  St. Louis, MO 63146 OR Remote, United States

• Adhering to NDBS Core Values
  • Safety
  • We Answer Our Phones
  • Always Innovating
  • Collaborative Partnerships
  • Reputation
  • Entrepreneurship
• Hydronics & Process Piping Design (Primary Focus)
  • Design and engineer hydronic heating and cooling water systems
  • Design industrial and process piping systems including chilled water, hot water, condenser water, glycol, refrigerant, compressed air, and specialty process piping
  • Perform pipe sizing, pump selection, expansion analysis, and equipment integration
  • Develop piping layouts, isometrics, and system schematics in Revit
  • Apply knowledge of fluid dynamics, pressure drop, flow rates, and system balancing
  • Ensure designs meet applicable mechanical and plumbing codes
  • Develop Sequences of Operation related to hydronic and piping systems
  • Coordinate closely with field teams to ensure constructability of piping systems
• HVAC Mechanical Design
  • Perform load calculations and psychrometric analysis
  • Design and plan layouts of equipment, duct, and piping systems
  • Drive HVAC design from concept through construction drawings utilizing Revit
  • Application engineering for refrigeration and HVAC/R systems
• Project Execution
  • Perform internal turnover meetings to identify project scope, risks, resource requirements, communications, schedule, and budgets
  • Collaborate with preconstruction department to ensure project bid scope is developed into design documents
  • Collaborate with operations department to ensure a shared understanding of project scope and overall project execution
  • Drive quality control through on site project visits and punch list creation

• Bachelor’s degree in related Engineering field, Mechanical preferred
• 5+ years of experience specifically in hydronic and/or industrial process piping design
• Strong background in fluid systems, piping layouts, and equipment integration
• Experience designing piping systems for industrial, healthcare, food processing, or manufacturing facilities
• Proficiency in Revit for piping system modeling
• Solid understanding of mechanical, plumbing, and energy codes related to hydronics and piping
• HVAC/R experience required, refrigeration experience a plus
• Healthcare design experience a plus
• Self-motivated with strong time management and organizational skills
• Ability to thrive in deadline-driven, fast-paced environments
• Strong communication and collaboration skills

NDBS is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability status, protected veteran status, or any other characteristic protected by law.