Soldered
joints shall not be permitted.
3.1.1.3
Hangers and Supports
Unless otherwise indicated, horizontal and vertical piping attachments
shall conform to MSS SP-58. Continuous inserts and expansion bolts may be
used.
3.1.1.4
Grading and Venting of Pipe Lines
Unless otherwise indicated, install horizontal lines of steam and return
piping to grade down in the direction of flow with a pitch of not less than
25 mm in 9 meters one inch in 30 feet, except in loop mains and main
headers where the flow may be in either direction. When counterflow of
condensate within the steam pipe occurs in a portion of a pipeline, pitch
up in the direction of steam flow a minimum of 150 mm per 30 meters 6
inches per 100 feet and increase pipe diameters by one standard pipe size.
Steam mains pitched away from the boiler shall contain drip connection and
air vent valves at the extreme end. Air vents shall be provided at the
highest point of any vertical riser. Drip connections shall not be
interconnected above the water line of the boiler.
3.1.1.5
Pipe Sleeves
**************************************************************************
NOTE: Specify flanges and clamping rings where
waterproofed construction is required.
**************************************************************************
Provide pipe sleeves where pipes and tubing pass through masonry or
concrete walls, floors, roofs, and partitions. Use Schedule 40 galvanized
steel pipe sleeves in outside walls below and above grade, in floor, and in
roof slabs. Sleeves in partitions shall be zinc-coated sheet steel having
a weight of not less than 4.43 kg per square meter 0.907 psf. Space
between pipe, tubing, or insulation and the sleeve shall be not less than
25 mm 1 inch. Hold sleeves securely in proper position and location before
and during construction. Sleeves shall be of sufficient length to pass
through entire thickness of walls, partitions, or slabs. Sleeves in floor
slabs shall extend 50 mm 2 inches above the finished floor. Pack space
between the pipe or tubing and the sleeve firmly with oakum and caulk both
ends of the sleeve with elastic cement. [Furnish sleeves in waterproofed
construction with flanges and clamping rings].
3.1.1.6
Floor, Wall, and Ceiling Plates
**************************************************************************
NOTE: Provide floor, wall, and ceiling plates for
buildings other than power plants and heating plants.
**************************************************************************
Secure plates to the pipe with enough clearance for thermal expansion of
pipe. Use chromium-plated steel or nickel-plated cast iron plates on pipes
passing through floors and partitions of toilet rooms and where indicated;
use painted cast iron, malleable iron, or steel for all other plates.
3.1.1.7
Flashing for Buildings
Provide tight waterproof flashing where pipes pass through building roofs
SECTION 15183N
Page 26