sensing element for control valve.
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All associated [HTW] [MTW] piping shall conform to the requirements
specified herein and arrangement be as indicated and specified. Install
control valve in the return side providing an upstream strainer, gate
isolation valves, and a bypass with a globe or plug valve (Do not install
control valve in supply with a check valve in the return). Install
automatic emergency shutoff valve to provide quick [HTW] [MTW] shutoff in
case of U-tube rupture and to protect the secondary piping. Install gate
isolation valve in the supply. Provide a dirt leg with a gate isolation
valve and capped end for the supply line drop. All valves shall be
installed in horizontal lines. Arrange connections to system terminal
units with offset flanges such that adequate clearance is provided for
pulling tubes and maintenance without requiring breaking of pipe.
3.2.5
Cleaning and Painting of Piping and Equipment
Clean and paint piping in accordance with Section 09900 PAINTS AND COATINGS.
3.2.6
Identification of Piping and Physical Hazards
Identify all piping & physical hazards in accordance with 29 CFR 1910.144,
ANSI A13.1, and ANSI Z53.1. Spacing of identification marks on runs shall
not exceed 15 meters 50 feet. Painting and stencilling shall conform to
Section 09900 PAINTS AND COATINGS." Colors shall conform to ANSI Z53.1.
3.2.7
Hangers and Supports
The design and fabrication of pipe hangers, supports, and welding
attachments shall conform to MSS SP-58 and ASME B31.1. Hanger types and
supports for bare and covered pipe shall conform to MSS SP-69for the
temperature range. Unless otherwise indicated, horizontal and vertical
piping attachments shall conform to MSS SP-58. Continuous inserts and
expansion joints may be used.
3.2.8
Pipe Sleeves
Provide sleeves where pipes pass through masonry or concrete walls. Sleeves
in outside walls below and above grade, shall be steel pipe, Schedule 80.
Space between pipe or insulation and the sleeve shall be not less than 6 mm
1/4 inch. Hold sleeves securely in proper position and location before and
during construction. All sleeves shall be of sufficient length to pass
through entire thickness of walls, partitions, or slabs. Firmly pack space
between the pipe and the sleeve with oakum and caulk on both ends of the
sleeve with elastic cement.
3.2.9
Provide a thermometer and pressure gage, as specified herein, on both the
high or medium temperature water supply and return piping located on the
system terminal unit side of the isolation valves.
3.3
WELDING
3.3.1
Responsibility of Contractor for Fusion Welding
The Contractor is entirely responsible for the quality of the welding and
shall:
SECTION 15184N
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