2.7.12
Dielectric Unions
Steel female pipe thread end and copper solder-joint ends, conforming to
dimensional, strength and pressure requirements of ASME B16.39, Class 1.
Steel parts shall be galvanized or plated. Union shall have a
water-impervious insulation barrier capable of limiting galvanic current to
one percent of the short-circuit current in a corresponding bimetallic
joint. When dry, it shall also be able to withstand a 600-volt breakdown
test.
2.7.13
Tetrafluoroethylene Tape
MIL-T-27730 for screw-jointed pipe.
2.7.14
Hose Reel Assembly
Complete with 15 meters 50 foot hose rated for a minimum of 862 kPa (gage)
125 psig, ball stop, hose extension with air coupler, hose rollers, [reel
enclosure,] [nonsparking ratchet pawl,] and required accessories.
2.8
SLEEVES
2.8.1
Floor Slabs, Roof Slabs, and Outside Walls Above and Below Grade
Galvanized-steel pipe having an inside diameter at least 12.70 mm 1/2 inch
larger than the outside diameter of the pipe passing through it. Provide
sufficient sleeve length to extend completely through floors, roofs, and
walls, so that sleeve ends are flush with finished surfaces except that
ends of sleeves for floor slabs shall extend 15 mm 1/2 inch above finished
floor surface. Sleeves located in waterproofed construction shall include
flange and clamping ring.
2.8.2
Partitions
Galvanized sheet steel, 26 gage or heavier, of sufficient length to
completely extend through partition thickness with sleeve ends flush with
partition finished surface.
2.9
VALVE BOX
Provide rectangular concrete design with words "Compressed Air" cast or
otherwise marked on the cover. Size shall be large enough for removal of
valve without removing box. Provide valve box for areas as follows:
a.
Roads & traffic areas:
Heavy Duty, cast iron cover
b.
Other areas:
Standard duty, heavy steel plate or concrete cover
2.10
IDENTIFICATION LABELS FOR PIPING
Labels for pipes 20 mm 3/4 inch o.d. and larger shall bear printed legends
to identify contents of pipes and arrows to show direction of flow. Except
that of pipes smaller than 20 mm 3/4 inch o.d., labels shall have color
coded backgrounds to signify levels of hazard in accordance with PFI ES 22.
Legends and type and size or characters shall also conform to PFI ES 22.
Labels shall be made of plastic sheet in conformance with FS A-A-1689 with
pressure-sensitive adhesive suitable for the intended applications or they
may be premolded of plastic to fit over specific pipe outside diameters 20
mm 3/4 inch and larger. For pipes smaller than 20 mm 3/4 inch o.d.,
SECTION 15211N
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