Section 22 05 00: Common Work Results for Plumbing
All systems to have redundant features to provide continuity of service during maintenance and/or repair.
See Division 09 for Painting.
Pipe labels shall be water proof and permanently affixed to pipe. Label will be color coded in accordance Oregon Administrative Rules 952-001-0070 based on utility being carried by the pipe. Label shall have flow direction arrow preceding utility name.
Labels shall be located generally at the following locations in pipe system:
Access panels are required in each situation where items requiring maintenance are located above a concealed ceiling or wall.
Use screwdriver actuated locks.
Access panel sizes shall allow for easy access for maintenance. Verify size with OSU Project Manager.
Access panel locations shall be indicated on contract drawings.
Access panels are not required in lay-in ceilings, but identify appropriate tile with color button, cleated through, located on the adjacent ceiling grid. Use color code of principal service.
Piping shall be pitched and valves installed to facilitate complete drainage of the system.
All piping run within the building shall be run concealed in the finished portions of building in pipe spaces, ceilings or furred chases and exposed only in mechanical rooms and where shown on the drawings.
No pipe shall pass in front of or interfere with any openings, door or window. Head room in front of openings and doors shall in no case be less than the top of the opening.
Piping shall not pass exposed through electrical rooms or be erected over any switchboard or other electrical gear.
Pipe sizes shall be indicated on the plans at each change in direction and at all branch take off locations.
Provide two -inch clearance between insulated piping and other obstructions.
No union shall be placed in a location which will be inaccessible.
Unions shall be installed adjacent to all equipment for repair and replacement.
Electrolysis control between dissimilar materials shall be achieved through the use of dielectric nipples and a non-dielectric union. Dielectric unions shall be avoided whenever possible.
All pipes passing through wall or floor construction shall be fitted with sleeves. Each sleeve shall extend through its respective floor, wall or partition and shall be cut flush with each surface unless otherwise specified. Sleeves shall be two pipe sizes larger than the pipe when un-insulated and of sufficient size to allow for the insulation without binding. Floor sleeves in mechanical rooms shall extend 4 inches above finished floor, all other spaces minimum one inch above finished floor.
Sleeves in bearing walls, masonry walls, masonry partitions, and floors shall be standard weight steel pipe finished with smooth edges. For other than masonry partitions, through suspended ceilings and for concealed vertical piping, sleeves shall be No. 22 USG galvanized steel.
Where pipes pass through waterproofed floor or walls, design of sleeves shall be such that waterproofing can be flashed into and around the sleeves.
Sleeves through exterior walls below grade shall have the space between pipes and sleeves caulked watertight.
Install one-piece chrome-plated escutcheon plates with set screw at sleeves for all pipes exposed in finished areas.
The annular space between sleeves and pipe shall be filled with fiberglass insulation and caulked in non-fire rated situations.
Where pipes pass through fire-rated floors, walls, or partitions, the use of a UL approved system for through penetrations is required. The annular space around the pipes shall be packed with mineral wool or other noncombustible material and sealed at each exposed edge to maintain the rating of the system in accordance with the through penetration sealant manufacturer's recommendations.
System and Equipment Drains:
All piping shall be arranged to completely drain the system. Drain locations shall be located at all system low points.
Where sectionalizing valves are installed, a drain shall be installed on downstream side of valve to drain that section of the system.
All cooling tower drains and overflow are to be piped to sanitary system (not onto roof).
All system and equipment drains are to be piped to a floor drain.
All welding shall be done in accordance with the AWS.
All boiler, pressure vessel, and gas piping welding must be done by certified welders as required by applicable codes.
All valves on any one project shall be the product of one manufacturer.
Locate valves in accessible locations, not more than six feet above the floor, if frequently used, and with a union on the downstream side of threaded end valves.
Valves shall be right handed. Balancing valves shall be a type that can be used for shut-off without disturbing balancing point setting.
Where possible, valves shall be installed with valve bonnet in an upright position to prevent deterioration or corrosion of bonnet and packing.
Use gate valves for lines 3 inch and larger and ball valves for lines 2-1/2 inches and smaller for sectionalizing service. Globe valves will be used for flow modulation.
Ball valves equipped with “characterizing discs” may be used for throttling purposes in lieu of globe valves. Design Professional shall prequalify with Owner’s Authorized Representative the use of these valves.
Specialty valves shall be employed where appropriate, such as check valves on a pump discharge, pressure regulating valves for equipment requiring lower-than-available system pressure, solenoid valves, etc.
Valve body materials shall be compatible with piping system materials.
Flanged or threaded end valves are preferred.
All constant speed circulating pumps shall include a separate shut off valve, balancing valve, and check valve. Triple duty valves are not allowed.
Balancing valves shall not be used on pumps equipped with variable speed drives.
Isolation shutoff valves shall be installed at each piece of equipment, terminal unit, and each branch takeoff to facilitate shutdown for repair. Positive shutoff balancing valves with memory may satisfy this requirement at terminal units.
Balancing valves shall be installed in all 3-way control valve bypass lines and at all flow meters.
Gate valves shall be limited to shutoff service only. Gate valves shall not be used in a throttling application. Globe valves or ball valves shall be used.
Where check valves are required, check valves shall be installed on the equipment side of all shutoff valves to facilitate servicing the check valve.
Drain valves shall be a minimum of 3/4" with hose end connection.
EXECUTION AND QUALITY CONTROL
All piping must be tested prior to receiving insulation.
Test pressures shall be minimum 1 1/2 times system operating pressure or as specified by the Design Professional.
Prior to filling the systems, all joints and potential leak sources shall be painted with a water-power blue line caulk mixture and allowed to dry.
During the test each joint shall be visually inspected.
Pressure tests must be witnessed and acknowledged in writing by the Owner’s Authorized Representative.
Piping Systems Disinfection
Before being placed into service, all new water lines, except those used exclusively as fire lines, shall be disinfected in accordance with AWWA standards. Final connections to existing water lines shall not be made until this procedure is completed satisfactorily.
The University shall be notified in advance of the date and time that the disinfection is to begin. The University shall witness the process.