| Capital Projects Home Page |
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| Division 15 Mechanical |
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| 15-4 | Plumbing |
| J. | Hose Bibbs And Landscape Irrigation Service |
| 1. | Provide hose bibbs at important outside entrances to a building for washing down purposes. Locate these as inconspicuously as possible consistent with accessibility. Provide a ground level hose bibb for washdown at all large concrete areaways or shafts. Hose bibbs shall be supplied from an industrial water system or have separate RP device or vacuum breaker and backflow preventer on each hose bibb. |
| 2. | Landscape irrigation hose bibbs and backflow preventer are normally under a separate landscaping contract. Provide a valved branch from the building service outside the building for future connection. Discuss size and location with Planning, Design and Construction (CP). Note that all hose bibbs require a backflow preventer. |
| 3. | Provide 4" plastic pipe sleeves below all roads and walks to permit later installation of irrigation system to reach all areas from the service point without cutting new work. Install sleeves with 18" minimum and mark locations. |
| K. | Disinfection Of Water Systems |
| In new construction, specify that the plumbing subcontractor shall be responsible for cleaning and disinfecting the domestic hot and cold water systems, including fire systems connected to the domestic water systems, in accordance with the standards in the Appendix. For remodeling work, modify the procedure as required to accommodate the occupants. |
| L. | Joints |
| 1. | Do not specify caulked joints in pipes receiving periodic discharges of hot liquids (dishwashers, pot sinks, steam kettles, etc.) Pay particular attention to joints occurring above general storage, food storage or food preparation areas - or better, avoid locating piping above these areas. Sewage lines shall not be installed above such areas. |
| 2. | Threading of case iron pipe for any purpose will not be permitted and joints between cast iron and other dissimilar metals shall be made with proper transition type compression coupling (Smith Blair, Gustin Bacon, etc.). Show any such joint sufficiently outside the building to prevent a leak, or break, from flooding building. |
| M. | Plumbing Isolating Valves |
| 1. | Show all valves on drawings. Do not rely on listing in the specifications or a general requirement (where or as required, etc.) clause. |
| 2. | Arrange and valve all utility services so that, as a minimum, each floor may be isolated. |
| 3. | Arrange and valve domestic hot and cold water piping so that toilet rooms can be isolated without interrupting service to other parts of the building. |
| 4. | Show sectionalizing valves in top center and bottom of risers in hot water supply and return systems. |
| 5. | Show accessible service isolating valves for laboratory piping at the point of branch connections from mains. Valves need not be provided at the laboratory furniture units except for individual outlet faucets or cocks, not furnished with units. |
| 6. | Isolate fire protection system (wet standpipe) by means of a main valve, or valves, at the bottom of riser, locked open and marked with a suitable warning sign. Install a double check valve after the valve. |
| 7. | Show isolating valves to permit separate chlorination of water system in buildings or projects where occupancy may occur in increments, as construction is completed. |
| 8. | Place valves on each side of backflow or check valve to permit servicing. |
| 9. | Show valves on all services left for future connections (tees, stubs, etc.) unless they are in a valved zone, or isolated by other valves, that permits only a minor loss of pipe contents when opened. |
| N. | Pipe Installation |
| 1. | Specify a proper corrosion preventive wrapping for any black steel piping installed below grade (bituminous and paper wrapping or extruded plastic). See Appendix. |
| 2. | Provide water hammer arrestors in water lines to equipment or fixtures having quick closing or flush valves and any equipment that might produce water hammer. Water hammer arrestors shall be certified by the Plumbing and Drainage Institute (PDI). Show location and size of all water hammer arrestors on plans and access for maintenance or replacement. Provide access panels if required. Do not rely on general note Size and location as recommended by manufacturer. |
| 3. | Show clean-outs in sewer lines as required by code. In addition, vertical to horizontal changes in main risers that occur above furred ceilings shall have a clean-out extended from the base to a floor clean-out or a wall clean-out above the change in direction. |
| 4. | Specify y pattern strainers for water lines 3" and smaller. Screens shall be monel with 1/16" perforations. Furnish strainers with caps and gaskets for positive positioning of screens. Screens shall fit into a recess machined into cap and body. Provide a 1/2" plug-type blow off valve with hose end on each strainer. Above 3", specify basket-type strainers with same screen and screwed or clamped cover. |
| 5. | Insulate all plastic and glass piping where it penetrates a floor, wall or ceiling, to prevent flame spread between areas. Insulation and installation method shall be approved by the State Fire Marshal. |
| 6. | Do not embed piping in concrete. Where piping must penetrate concrete at foundations or ground floor slab, coordinate with the appropriate architectural sections and drawings to detail and dimension wrapping and/or sleeve with appropriate flexible seal to concrete. |
| 7. | Specify additional hangers or supports for all plastic piping. |
| O. | Risers |
| 1. | Include a single-line, no-scale, riser diagram of each piping system on the plumbing drawings for all multistory buildings. Riser diagrams shall include soil, waste, vent, hot and cold water, compressed air, gases and distilled water systems. |
| 2. | Riser diagrams shall show pipe sizes, sectionalizing valves, expansion joints, water hammer arrestors and any equipment in the system. Show design quantities and pressure, where applicable, for both branch and riser at each connection point. |
| 3. | Indicate the basis used in sizing the pipes below the title of each diagram. |
| P. | Kitchen Grease, Plaster, Sediment And Sand Traps |
| 1. | In general, grease traps should be avoided except where required by code or other regulations. If required, locate for easy access and servicing, preferably outside, with proper venting. |
| 2. | Provide plaster, sediment or sand traps at sinks that could discharge these materials into the waste system. Examples include sculpture rooms, pottery rooms, earth science and geology laboratories, greenhouse sinks, etc. Consider the use of a single large separator for a series of sinks or an area. All traps or separators located below sinks shall be accessible, with easy-opening top. |
| 3. | Provide a sand and soil interceptor in any greenhouse waste line serving floor drains and sinks only. Locate outside where possible and in an accessible location. |
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