Answers and Analysis

This knowledge base, updated to include the analyses from the 2003 through the most recent editions of the Uniform Plumbing and Mechanical Codes, continues to be a premier source for engineers, inspectors, students, contractors and tradesmen. Questions come from a broad base of users, and answers are informal interpretations of the Codes provided by a committee of code officials and special experts - they are clearly stated and to the point. This updated site combines the most pertinent analyses from the previous manual and presents them together with those based on the most recent publications of the Uniform Codes. This makes the Answers and Analysis database one of the most valuable tools you as a member can access wherever you have an internet connection.

The Answers and Analysis tool makes it easy to search for relevant questions and answers, either based on keywords or specific sections/chapters of the code. To find questions related to specific topics, type in the keyword(s), select the code and the year and click "Search". To search for questions related to a specific section, type the section in the Section field and click "Search". To search a specific chapter or appendix, select either the UPC or UMC Table of Contents, and select the chapter/appendix from the list.

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UPC Table Of Contents

Chapter	Title
1	Administration
2	Definitions
3	General Regulations
4	Plumbing Fixtures and Fixture Fittings
5	Water Heaters
6	Water Supply and Distribution
7	Sanitary Drainage
8	Indirect Wastes
9	Vents
10	Traps and Interceptors
11	Storm Drainage
12	Fuel Gas Piping
13	Health Care Facilities and Medical Gas and Medical Vacuum Systems
14	Firestop Protection
15	Alternate Water Sources for Nonpotable Applications
16	Nonpotable Rainwater Catchment Systems
17	Referenced Standards
Appendix A	Recommended Rules for Sizing the Water Supply System
Appendix B	Explanatory Notes on Combination Waste and Vent Systems
Appendix C	Alternate Plumbing Systems
Appendix D	Sizing Storm Water Drainage Systems
Appendix E	Manufactured/Mobile Home Parks and Recreational Vehicle Parks
Appendix F	Firefighter Breathing air Replenishment Systems
Appendix G	Sizing of Venting Systems
Appendix H	Private Sewage Disposal Systems
Appendix I	Installation Standards
Appendix J	Combination of Indoor and Outdoor Combustion and Ventilation Opening Design
Appendix K	Potable Rainwater Catchment Systems
Appendix L	Sustainable Practices
Appendix M	Sustainable Practices
Appendix N	Impact of Water Temperature on The Potential for Scalding and Legionella Growth

UMC Table Of Contents

Chapter	Title
1	Administration
2	Definitions
3	General Requirements
4	Ventilation Air
5	Exhaust Systems
6	Duct Systems
7	Combustion Air
8	Chimneys and Vents
9	Installation of Specific Appliances
10	Boilers and Pressure Vessels
11	Refrigeration
12	Hydronics
13	Fuel Gas Piping
14	Process Piping
15	Solar Energy Systems
16	Stationary Power Plants
17	Referenced Standards
Appendix A	Residential Plans Examiner Review Form for HVAC System Design
Appendix B	Procedures to be Followed to Place Gas Equipment in Operation
Appendix C	Installation and Testing of Oil (Liquid) Fuel-Fired Equipment
Appendix D	Fuel Supply: Manufactured/Mobile Home Parks and Recreational Vehicle Parks
Appendix E	Sustainable Practices
Appendix F	Geothermal Energy Systems
Appendix G	Sizing of Venting Systems and Outdoor Combustion and Ventilation Opening Design
Appendix H	Example Calculation of Outdoor Air Rate

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Questions matching UPC Chapter Appendix H

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UPC 2003 Appendix H

Topic: Single Service Kitchens

Could you please define the term single service kitchen as used in Appendix H?

The term single service kitchen, as used in Appendix H, refers to a fast food type of restaurant where all plates, cups, knives, forks, spoons, etc. used for serving and consuming food products are used only one
time and then discarded. This type of operation reduces the amount of grease entering into the sanitary
system and is reflected in the reduced Table H-1, Item 4, Sizing Criteria.

UPC 2003 Appendix H

Topic: Single Service Kitchens

1. Is a fast food establishment classified as a 'single service' or a fully equipped kitchen? 2. In fast food establishment, is a warewasher categorized as a dishwasher?

1. A "single service" kitchen utilizes disposable utensils, containers and wrappers intended for a one time use, as well as the disposal of food remnants in a manner similar to that of the "single service" utensils.
2. A warewasher is, by design, smaller than a dishwasher and used for small utensils such as silverware.
A dishwasher could be utilized as a "warewasher;" however, a "warewasher" could not be substituted
for a dishwasher.

UPC 2003 Appendix K UPC 2006 Appendix K UPC 2009 Appendix K UPC 2012 Appendix H

Topic: Cleanouts for Effluent Lines

Are cleanouts required per Appendix K (or Section 719.0, 2003/2006/2009) for the effluent pipe from the septic tank to the leach line?

Appendix K does not require a cleanout downstream of a septic tank or downstream of a distribution box as it is presumed that a properly designed and adequately sized septic tank will discharge no solids or
materials that will create a stoppage.

UPC 2003 Appendix K UPC 2006 Appendix K UPC 2009 Appendix K UPC 2012 Appendix H

Topic: Sizing Dosing Fields

What is an appropriate application of sizing dosing systems?

Dosing systems are installed only when the total length of the leach field piping exceeds 500 feet. Dual systems are installed only when the leach field exceeds 1,000 lineal feet, and in each case the dosing liquid
volume must not exceed 75 percent of the interior area of the half of the system which is being dosed.
Dosing tanks are required by Section K 6.0 (H)(2003/2006/2009), H 6.0 (H) (2012) to be equipped with an automatic siphon or pump which discharges the tank once every 3 or 4 hours (6 or 8 hours in the case of dual systems).

UPC 2003 Table K-1 UPC 2006 Table K-1 UPC 2009 Table K-1 UPC 2012 Appendix H Table H 1.7

Topic: Septic Tank and Leach Line Setbacks

Is it reasonable and prudent to assume that, for the purpose of enforcing setback requirements from septic tanks and leach fields (Appendix K, Table K-1 (2003/2006/2009) Appendix H Table H 1.7 (2012)), recreational vehicles and manufactured homes need to be
considered as “structures”?

A mobile home or manufactured home is almost as permanent a structure as a house built on the site, considering the wheels are usually removed and skirts, patio covers, are added; making the mobile home,
in effect, a semi-permanent structure.
The recreational vehicles (RV) park, on the other hand, serves structures that retain their wheels and,
in case of necessity, they can be moved off the slab for access or maintenance to private sewerage
systems.
In any case, the retention tank or leach field should not be placed directly under either the RV slab or
the mobile home slab. In the case of an RV park, location relative to the RV site slab could be less than
the distance called for in Table K-1 (2003/2006/2009) Table H 1.7 (2012), line 1, for buildings or structures.

UPC 2009 Appendix K UPC 2012 Appendix H UPC 2015 Appendix H

Topic: Private Sewage Disposal Systems

Where would I find the code on septic systems, setbacks and such?

Appendix H (2012/2015), Appendix K (2009) provides most if not all of the requirements of the installation of a septic system. However, these guidelines are for general purposes unless specifically adopted by the AHJ. The local AHJ for these types of systems should be contacted to obtain information regarding septic systems in that specific area.