“Non-Cooperative Games” 1951 | John Nash
John Nash’s Recommendation Letter for Princeton University pic.twitter.com/k9TCftyfGs
— Math Files (@Math_files) January 16, 2026
“Non-Cooperative Games” 1951 | John Nash
John Nash’s Recommendation Letter for Princeton University pic.twitter.com/k9TCftyfGs
— Math Files (@Math_files) January 16, 2026
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Complete Monograph: 2024 GROUP A PROPOSED CHANGES TO THE I-CODES
Design Considerations for Hot Water Plumbing
Baseline Standards for Student Housing
2024/2025/2026 ICC CODE DEVELOPMENT SCHEDULE
Indoor plumbing has a long history, but it became widely available in the 19th and early 20th centuries. In the United States, for example, the first indoor plumbing system was installed in the Governor’s Palace in Williamsburg, Virginia in the early 18th century. However, it was not until the mid-19th century that indoor plumbing became more common in middle-class homes.
One important milestone was the development of cast iron pipes in the 19th century, which made it easier to transport water and waste throughout a building. The introduction of the flush toilet in the mid-19th century also played a significant role in making indoor plumbing more practical and sanitary.
By the early 20th century, indoor plumbing had become a standard feature in most middle-class homes in the United States and other developed countries. However, it was still not widely available in rural areas and poorer urban neighborhoods until much later.
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Today’s Handout: Radon, et al (For future dedicated session)
During today’s colloquium we audit the literature that sets the standard of care for mechanical engineering design, construction operations and maintenance of campus district energy systems — typically miles (kilometers) of large underground pipes and wires that characterize a district energy system. Topically, Mechanical 400 deals with energy systems “outside” or “between” buildings; whereas Mechanical 200 deals with energy systems within an individual building envelope.
2024 International Mechanical Code
A campus district energy system is a centralized heating and cooling network that supplies thermal energy to multiple buildings within a defined area, such as a college or university campus. The system generates steam, hot water, or chilled water at a central plant, which is then distributed through an underground network of pipes to individual buildings for space heating, domestic hot water, and air conditioning. By consolidating energy production and distribution, campus district energy systems can achieve significant energy and cost savings compared to individual building systems, as well as reduce greenhouse gas emissions and improve reliability and resiliency of the energy supply.






We track standards setting in the bibliographies of the following organizations:
AHRI | Air Conditioning, Heating & Refrigeration Institute
ASHRAE | American Society of Heating & Refrigeration Engineers
ASHRAE Guideline 14: Measurement of Energy and Demand Savings
ASHRAE Guideline 22: Instrumentation for Monitoring Central Chilled Water Plant Efficiency
ASME | American Society of Mechanical Engineers
ASPE | American Association of Plumbing Engineers
ASTM | American Society for Testing & Materials
AWWA | American Water Works Association
AHRI | Air Conditioning, Heating & Refrigeration Institute
IAPMO | International Association of Plumbing and Mechanical Officials
IEC | International Electrotechnical Commission
Institute of Electric and Electronic Engineers
Research on the Implementation Path Analysis of Typical District Energy Internet
Expansion Co-Planning of Integrated Electricity-Heat-Gas Networks in District Energy Systems
Towards a Software Infrastructure for District Energy Management
IMC | International Mechanical Code
IDEA | International District Energy Association
District Energy Best Practices Handbook
District Energy Assessment Tool
IPC | International Plumbing Code
ISEA | International Safety Equipment Association
NFPA | National Fire Protection Association
SMACNA | Sheet Metal Contractors National Association
UL | Underwriters Laboratories
UpTime Institute
(All relevant OSHA Standards)
It is a large domain and virtually none of the organizations listed above deal with district energy systems outside their own (market-making) circle of influence. As best we can we try to pull together the peak priorities for the real asset managers and engineers who are responsible for these system.
* Building services engineers are responsible for the design, installation, operation and monitoring of the technical services in buildings (including mechanical, electrical and public health systems, also known as MEP or HVAC), in order to ensure the safe, comfortable and environmentally friendly operation. Building services engineers work closely with other construction professionals such as architects, structural engineers and quantity surveyors. Building services engineers influence the architectural design of building, in particular facades, in relation to energy efficiency and indoor environment, and can integrate local energy production (e.g. façade-integrated photovoltaics) or community-scale energy facilities (e.g. district heating). Building services engineers therefore play an important role in the design and operation of energy-efficient buildings (including green buildings, passive houses and zero energybuildings. uses. With buildings accounting for about a third of all carbon emissions] and over a half of the global electricity demand, building services engineers play an important role in the move to a low-carbon society, hence mitigate global warming.
More:
Practical Essay on the Stength of Cast Iron and Other Metals Thomas Tredgold (1882)
George Herman Babcock — through his patents of pumps, steam engines, and novel boiler designs with collaborator Stephen Wilcox — raised the standard for safe boiler design & operation.https://t.co/qakAw4jfCn pic.twitter.com/3rCxXHkBfM
— Standards Michigan (@StandardsMich) October 21, 2020
Design, construction, operation and maintenance of environmental air, piping and drainage systems is one of the largest cost centers in education facilities. We find subtle tradeoffs between fire safety, energy conservation and indoor air quality goals. With solid data and enlightened debate which include the user-interest (the final fiduciary in the education facility industry, for example) those tradeoffs are reconciled by technical committees administered by three ANSI-accredited standards developers:
American Society of Heating and Refrigeration Engineers (ASHRAE)
American Society of Mechanical Engineers (ASME)
National Fire Protection Association (NFPA)
Sheet Metal & Air Conditioning Contractors National Association
Today we focus on the leading safety practice of NFPA 90A Standard for the Installation of Air-Conditioning and Ventilating Systems. From the NFPA 90A prospectus:
[NFPA 90A] shall cover construction, installation, operation, and maintenance of systems for air conditioning and ventilating, including filters, ducts, and related equipment, to protect life and property from fire, smoke, and gases resulting from fire or from conditions having manifestations similar to fire.
[Explanation A.1.1] An air duct system has the potential to convey smoke, hot gases, and flame from area to area and to supply air to aid combustion in the fire area. For these reasons, fire protection of an air duct system is essential to safety to life and the protection of property. However, an air duct system’s fire integrity also enables it to be used as part of a building’s fire protection system. Guidance for the design of smoke-control systems is provided in NFPA 92, Standard for Smoke Control Systems. Pertinent information on maintenance is provided in Annex B. Maintenance of fire dampers, ceiling dampers, smoke dampers, and combination fire/smoke dampers requirements can be found in NFPA 80, Standard for Fire Doors and Other Opening Protectives, and NFPA 105, Standard for Smoke Door Assemblies and Other Opening Protectives.
The original University of Michigan codes and standards advocacy enterprise spoke loud and clear about duct smoke detector application, control signaling and maintenance requirements from the user point of view. Owing to the re-organization we missed the 2018 revision but we are now recovering from where we left off for the 2021 revision.













The First Draft Report for the 2021 edition is linked below:
First Draft Ballot / Final Results
90A_A2020_AIC_AAA_SD_PCResponses
NFPA 90A is heavily referenced in an interlocking matrix of related fire safety consensus products but it is not very lengthy document. We include it on the standing agenda of our periodic Mechanical and Prometheus Bound teleconference. See our CALENDAR for the next online meeting.
Issue: [13-118]
Category: Fire Protection, Mechanical
Colleagues: Mike Anthony, Richard Robben, Larry Spielvogel
:
New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwB pic.twitter.com/GkAXrHoQ9T
— USPTO (@uspto) July 13, 2023
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