Laserfiche WebLink
r <br /> 3.05 PIPING INSTALLATION <br /> A. All pipes shall be required size, round and straight and shall be cut, reamed,threaded,beveled for welding and/or <br /> otherwise prepared for joining with proper tools. All piping shall be properly enclosed, supported, guided, <br /> anchored,sway braced,connected,tested,cleaned and flushed out,properly insulated and protected where required, <br /> and run in a neat and orderly manner to the satisfaction of the Engineer. Lines required to be enclosed in ceilings, <br /> chaseways or similar spaces shall be installed to permit such enclosure as intended. This contractor must lay out his <br /> work, properly locate the apparatus and add necessary pipe, sleeve, etc., and take his own measurements at the <br /> building. <br /> B. All pipes shall be run with proper grade to provide for easy draining and in group runs where applicable. Pipe sizes <br /> shown on the drawings are nominal pipe sizes and not outside diameters. Pipes shall be run substantially as <br /> indicated on the drawings. <br /> C. All piping shall be installed with ample provisions for expansion and contraction to prevent damage to same or to <br /> building structure. Such provisions shall be made by means of piping offsets, changes in directions, expansion <br /> loops and/or suitable expansion joints. Suitable anchors and guides shall be provided to permit proper deflection <br /> and compression of offsets, loops and/or expansion joints. Expansion joints shall not be used in lieu of offsets, <br /> changes in direction or loops,except where specified and/or indicated on the drawings. <br /> D. In general, pipe lines requiring drainage shall be laid out at the site, first the large pipe mains, then space for air <br /> ducts, then electrical conduit. The Mechanical Contractor shall provide extra stub risers, drip-trap-and-rise <br /> installations, and drip and trap assemblies at low points in steam systems, air vents,rises and drops in forced hot <br /> water mains as may be required,and extra lengths and fittings in all phases as may be required to install all systems <br /> in the space available and as necessary to avoid interferences. <br /> E. All groups of fixtures shall have main valves including drain cocks with valves spotted in accessible,but concealed <br /> locations. Sectionalizing valves shall be provided to isolate branch lines from the mains. All groups of fixtures <br /> utilizing flush valves shall be provided with water hammer arrestors at each level. <br /> F. All piping systems shall conform with all applicable requirements of the ASA Code for Pressure Piping and with all <br /> applicable State and local codes,except where type and quality of materials,weights,thicknesses,design,pressures <br /> or fabrication techniques are called for in these specifications which exceed or upgrade such code requirements, <br /> these specifications shall govern. <br /> G. Permissible assemblies for welded pipe lines. Following specification covers permissible assemblies for welded <br /> pipe lines for all services operating at 150 psig or less. <br /> 1. The use of mitered elbows in welded lines will not be permitted. <br /> 2. Mitered tees will not be permitted in welded lines. Connections shall be made with welding tees. The use of <br /> weldolets will be permitted in lieu of welding tees in welded lines provided they are installed in prefabricated <br /> assemblies and the pipe interior is cleaned of slag. <br /> 3. Mitered reducers will not be permitted in welded lines. <br /> 4. Pipe caps in welded lines may be fabricated from flat steel plate cut round and inserted into the pipe of <br /> sufficient depth to permit a fillet weld equal the plate thickness. <br /> 5. The pipe ends in all tees, laterals and reducers shall be carefully prepared to provide for proper weld <br /> penetration in accordance with ASA Standards. <br /> 1 15050-5 No.99132-CP2 <br />