Mechanical Engineering Standards

Review Design Standards General Statements before utilizing this web page.

On this page:
Building Codes & Industry Standards
Denver Service Center (DSC) Requirements
National Park Service (NPS) Requirements

For Fire Protection and Sustainability Design requirements, see Fire Protection Engineering and Sustainability Standards.

Building Codes & Industry Standards

Heating, Ventilation, and Air Conditioning (HVAC)

  • IECC 2018 (International Energy Conservation Code)
  • IMC 2018 (International Mechanical Code)
  • ASHRAE (American Society of Heating, Refrigerating and Air Conditioning Engineers)
    • ASHRAE Guideline 0-2013 The Commissioning Process
    • ASHRAE Guideline 1.1-2007 HVAC&R (HVAC & Refrigeration) Technical Requirements for The Commissioning Process
    • ASHRAE 52.2-2012 Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size
    • ASHRAE 55-2010 Thermal Environmental Conditions for Human Occupancy
    • ASHRAE 62.1-2013 Ventilation for Acceptable IAQ (Indoor Air Quality)
    • ASHRAE 62.2-2013 Ventilation and Acceptable IAQ in Low-Rise Residential Buildings
  • ANSI (American National Standards Institute)/ASHRAE
    • ANSI/ASHRAE 15-2013 Safety Standard for Refrigeration Systems
    • ANSI/ASHRAE 90.2-2007 Energy-Efficient Design of Low-Rise Residential Buildings
  • ANSI/ASHRAE/IES (Illuminating Engineering Society) 90.1-2014 Energy Standard for Buildings Except Low-Rise Residential Buildings
  • ANSI/SMACNA (Sheet Metal and Air Conditioning Contractors' National Association) 006-2006 HVAC Duct Construction Standards - Metal and Flexible
  • NFPA (National Fire Protection Association) Codes and Standards - see Fire Protection Engineering Standards


  • IPC 2021 (International Plumbing Code)
  • Barrier-Free Plumbing Fixtures: ABA (Architectural Barriers Act) Accessibility Standards

Fuel Systems

  • IFGC 2018 (International Fuel Gas Code)
  • NFPA Codes and Standards - see Fire Protection Engineering Standards
  • API RP (American Petroleum Institute Recommended Practices)
    • API RP 1604-1996 Closure of Underground Petroleum Storage Tanks
    • API RP 1615-2011 Installation of Underground Petroleum Storage Systems
  • PEI RP (Petroleum Equipment Institute Recommended Practices)
    • PEI RP 100-2011 Recommended Practices for Installation of Underground Liquid Storage Systems
    • PEI RP 200-2013 Recommended Practices for Installation of Aboveground Storage Systems for Motor Vehicle Fueling
  • UL (Formerly Underwriters Laboratories)
    • UL 58-1996 Standard for Steel Underground Tanks for Flammable and Combustible Liquids
    • UL 142-2006 Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids
    • UL 1316-1994 Glass-Fiber-Reinforced Plastic Underground Storage Tanks for Petroleum Products, Alcohols, and Alcohol-Gasoline Mixtures
    • UL 2085-1997 Standard for Protected Aboveground Tanks for Flammable and Combustible Liquids

Stationary Engines and Cogeneration

Conveying Systems

  • ANSI/ALI ALCTV (Automotive Lifts - Construction, Testing, and Validation) 2017 Safety Requirements
  • ANSI/ASME (American Society of Mechanical Engineers) A17.1 2016 Safety Code for Elevators and Escalators
  • ANSI MH (Material Handling) 30.1-2015 Specification for Dock Leveling Devices
  • ASME B30.11-2010 Monorails and Underhung Cranes
  • ASME B30.16-2012 Overhead Hoists (Underhung)
  • ICC (International Code Council)/ASME/ANSI A117.1-2017 Accessible and Usable Buildings and Facilities

Denver Service Center (DSC) Requirements

Heating, Ventilation, and Air Conditioning (HVAC)

  • Indoor Design Conditions for Public, Office, and Living Spaces:
    • Winter: 72 degrees Fahrenheit
    • Summer: 75 degrees Fahrenheit
    • Maximum Relative Humidity: 60%
    • Electrical/IT (Information Technology) Rooms: 50-80 degrees Fahrenheit
  • Indoor Design Conditions for Shop and Storage Spaces:
    • Winter: 65 degrees Fahrenheit
    • Summer: 80 degrees Fahrenheit


  • Backflow Prevention: Comply with each Park's backflow prevention regulations. As minimums, provide double check valve assemblies on all fire services or other water service connections that may produce objectionable backflow and reduced pressure zone backflow assemblies on all makeup water connections to HVAC equipment or other water service connections that may produce hazardous backflow.
  • Water Pressure: Pressure reducing valves shall be provided as necessary to limit water pressure in buildings to 80 psig (per square inch gauge) maximum. Booster pumps shall be provided as necessary to maintain a minimum of 25 psig at the furthest plumbing fixture at design flow rate conditions.


Heating, Ventilation, and Air Conditioning (HVAC)

  • Outdoor Design Conditions: 2009 ASHRAE Fundamentals Handbook, Chapter 14 Climatic Design Information
  • Acoustical Criteria (maximum values)
    NC = Noice Criteria:
    • Auditoriums and Exhibit Spaces: NC25
    • Office Spaces: NC35
    • Shop Spaces: NC45
  • Building Material Thermal Properties: 2009 ASHRAE Handbook of Fundamentals, Chapter 26 Heat, Air, and Moisture Control in Building Assemblies - Material Properties
  • Energy Conservation:
    • ASHRAE Advanced Energy Design Guide for Small Office Buildings
    • ASHRAE Advanced Energy Design Guide for Small Retail Buildings
    • ASHRAE Advanced Energy Design Guide for Small Warehouses and Self Storage Buildings
  • Hot and Humid Climates: ASHRAE Guide for Buildings in Hot and Humid Climates


  • Compressed Air Systems: 1988 CAGI (Compressed Air and Gas Handbook)
  • Domestic Water Heating: 2011 ASHRAE HVAC Applications Handbook, Chapter 50 Service Water Heating

National Park Service (NPS) Requirements

NPS Management Policies 2006 - The Guide to Managing the National Park System

  • Chapter 9 Park Facilities
    • 9.1 General - This section provides requirements for design and construction of NPS facilities including sustainable energy, utilities, water supply systems, waste management, etc.
    • 9.3 Visitor Facilities - This section provides requirements for a range of visitor facilities including entrance stations, visitor centers, amphitheaters, campgrounds, comfort stations, etc.
    • 9.4 Management Facilities - This section provides requirements for a range of management facilities including administrative offices, museum collections management facilities, employee housing, etc.
  • Chapter 10 Commercial Visitor Services - This chapter provides requirements for concessionaire operations and facilities.

Handbooks, Reference Manuals (RMs), Strategies, Plans, & other Professional Materials


  • 40 USC (United States Code) §3312 - Compliance with Nationally Recognized Codes
  • Public Law PL 102-486 - Energy Policy Act of 1992 - Stipulates plumbing fixture flows and flush volumes.
  • Public Law PL 109-058 - Energy Policy Act of 2005 - Among other things this legislation requires:
    • Reduced building energy consumption by at least 30% (20% for renovation) compared with ASHRAE 90.1/IECC (where life-cycle cost effective).
    • Reduced water usage.
    • Procurement of both on-grid and off-grid renewable energy generation systems, such as solar hot water, solar electric, solar outdoor lighting, small wind turbines, and fuel cells where such systems are life-cycle cost-effective.
    • Specification of recovered minerals in cement and concrete as recommended by EPA (Environmental Protection Agency) guidance in their "Comprehensive Procurement Guidelines".
    • Provides a mechanism whereby design firms may obtain an income tax credit up to $1.80 per square foot of designed building, when design can be shown to meet specific energy targets.
    • Requires the use of Energy Star or FEMP (Federal Energy Management Program) designated products - for products covered by either of these programs.


Code of Federal Regulations (CFR)

Federal Acquisition Regulation (FAR)

  • FAR Parts 2, 4, 7, 11, 12, 13, 23, 42, 45 and 52.2 - FAR addresses contracting and procurement procedures. These parts outline acquisition planning, energy and water efficiency, renewable energy, etc.

Last updated: November 12, 2021

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