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PIPE FITTINGS
piping systems must be cleaned, tested, and accepted by Facilities Services prior to being placed in service. Refer to individual piping system specifications Sections for pipe and fitting material and joining methods.
PIPING SPECIALTIES
A. Dielectric unions are to be used at all junctions of dissimilar piping. Provide isolation valves upstream of dielectric union.
B. Pipe Escutcheons: Chrome plated, stamped steel, hinged, split-ring escutcheon, with set screw or snap-on type. Inside diameter shall closely fit pipe outside diameter or outside of pipe insulation where pipe is insulated. Outside diameter shall completely cover the opening in floors, walls, or ceilings. In exterior, damp, or corrosive environments, use stainless steel escutcheons.
C. Dielectric Waterway Fittings: Electroplated steel or brass nipple, with an inert and non-corrosive, thermoplastic lining.
D. Dielectric Unions: Provide dielectric unions with appropriate end connections for the pipe materials in which installed (screwed, soldered, or flanged), which effectively isolates dissimilar metals, prevents galvanic action, and stops corrosion.
E. Unions: Malleable iron, class 150 for low pressure service and class 250 for high pressure service; hexagonal stock, with ball and socket joints, metal to metal bronze seating surfaces; female threaded ends.
F. Strainers: Provide strainers full line size of connecting piping, with ends matching piping system materials. Screens shall be type 304 stainless steel, with 3/64” perforations at 233 per square inch.
H. Steel Sleeves: Schedule 40 galvanized, welded steel pipe, ASTM A53, grade A. Sleeves shall be cast in the slab for new construction, or core drilled and set in epoxy grout for retrofits. Sleeves in floors shall extend 6” above the floor.
piping systems must be cleaned, tested, and accepted by Facilities Services prior to being placed in service. Refer to individual piping system specifications Sections for pipe and fitting material and joining methods.
PIPING SPECIALTIES
A. Dielectric unions are to be used at all junctions of dissimilar piping. Provide isolation valves upstream of dielectric union.
B. Pipe Escutcheons: Chrome plated, stamped steel, hinged, split-ring escutcheon, with set screw or snap-on type. Inside diameter shall closely fit pipe outside diameter or outside of pipe insulation where pipe is insulated. Outside diameter shall completely cover the opening in floors, walls, or ceilings. In exterior, damp, or corrosive environments, use stainless steel escutcheons.
C. Dielectric Waterway Fittings: Electroplated steel or brass nipple, with an inert and non-corrosive, thermoplastic lining.
D. Dielectric Unions: Provide dielectric unions with appropriate end connections for the pipe materials in which installed (screwed, soldered, or flanged), which effectively isolates dissimilar metals, prevents galvanic action, and stops corrosion.
E. Unions: Malleable iron, class 150 for low pressure service and class 250 for high pressure service; hexagonal stock, with ball and socket joints, metal to metal bronze seating surfaces; female threaded ends.
F. Strainers: Provide strainers full line size of connecting piping, with ends matching piping system materials. Screens shall be type 304 stainless steel, with 3/64” perforations at 233 per square inch.
- Provide strainers with 125 psi working pressure rating for low pressure applications.
- Threaded ends, 2” and smaller: cast-iron body, screwed screen retainer with center blowdown fitted with pipe plug.
- Flanged ends, 2 ½” and larger: cast-iron body, bolted screen retainer with off center blowdown fitted with pipe plug.
H. Steel Sleeves: Schedule 40 galvanized, welded steel pipe, ASTM A53, grade A. Sleeves shall be cast in the slab for new construction, or core drilled and set in epoxy grout for retrofits. Sleeves in floors shall extend 6” above the floor.
see also : VALVE TYPES
