EXECUTIVE REQUIREMENTS AND CHARACTERISTICS OF MATERIALS L 'execution of work will be rule d' art, in compliance with the requirements of the DL and the needs arising from the combination of the work contracted to other companies.
Particular attention should be paid to the silent operation of the 'implantation, should therefore be taken all precautions to avoid the noise and the transmission. Boiler Wall:
will be forced flow-type combustion chamber with tin, with the producer of instant hot water consumption with earlier device, complete with air fittings and smoke of the fire, antifreeze kit (external ones), accessories of regulation, control and security, circulator with varying characteristics, thermal insulation, sheet-steel enamel coat, taps loading and interception of health and every accessory for their operation with natural gas. Heating elements:
radiators and will be laid with the upper horizontal well and the piping of attack will be perpendicular to the wall. If the measure of the radiator than 20 items such attacks should be on the opposite side. All radiators will be intercepted by the valve and holder. Off valves:
shall, unless otherwise required by type, Full bore ball, brass nickel plated outside, PTFE, brass ball chrome plated, complete with throttle lever or the maneuvering of the best quality but you like to DL Black steel pipes:
will look like seamless (Mannesmann) in specified sizes. The fittings will look like unified malleable iron with soldering tip. For links that will be used should be easily disassembled flanges or screwed joints in three pieces. E 'admitted directly to bend the pipe only for diameters less than 1 "1 / 4. The tube bending corrugations must not show or striated, otherwise it will not be accepted. If requested tarred pipes will be used externally and internally, in which case the value may be catramatura even in areas damaged by welding. L 'installation of the pipelines must be done to rule d' art, with proper slopes for the outpouring of 'air and dilators needed to compensate for variations in length, avoiding injury to the plaster and masonry structures. Before being walled or insulated piping will be subject to withstand a hydraulic test pressure of at least 2.5 bar higher than that of operation envisaged. | Galvanized steel pipes:
will look like seamless (Mannesmann) in specified sizes. It 'absolutely prohibited any welding and bending. The connections will be malleable iron, galvanized bath-type, screw and sleeve, with interposition of suitable sealant. L 'use of the elbows instead of the curves is allowed only in special cases and terminals of plumbing fittings. For links that should be easily detached will be used screwed galvanized three pieces. L 'installation must be done to rule d' art, as described above. If required the galvanized pipes will look like tar and iutato (the catramatura-iutatura will be resumed also on connections). Before assembly of equipment and even before the closures of the tracks, pipelines must be tested at a pressure of 6 bar, holding it for at least 12 hours. The tubing should be washed leaving scroll 's water and emptying at least twice the' whole plant. Copper pipes in rolls and / or rods:
be the heavy series according to UNI 6507-69. The pipes will be put in place without welding and bending with the curves will be performed: The connection of pipes to the bodies will be by end fittings threaded brass compressionein, with interposition of brass nose cone (or other material to ensure the required length of time ) to the 'outside of the tube. E 'prohibited, unless a clear contrary view, the' use of valves with welding ends for copper. If requested a copper tube with a diameter up to 18 mm will be supplied already coated with PVC jacket. Supports and anchorages:
the pipes and ducts must be supported by special brackets made to allow the 'exact location. Ta li shelves will be placed at a distance not exceeding 2.5 ml 'one from' the other and not more than 50 cm from each change of direction. Will be implemented to allow the 'continuous thermal insulation, the free dilatation and blockage of the pipe at fixed points and that both of them to avoid contact with structures and masonry. The Company shall submit installatrice 's approval of the DL type of support and anchoring system that will use. Polyethylene Pipes drive (PEH):
their installation must comply strictly with the requirements of the manufacturer. The fittings and joints will be the type to weld with welding-type mirror (done with special equipment) or sleeve resistance. vertical piping will provide fixed points in 'through each slab with expansion sleeve placed over these points and axial sliding collars. | The pipes will be supported with collars with horizontal distance of 10 diameters or, preferably, placed in a channel plate suitably fixed to the structures. The connection to the sanitary timber terminals will be done with special polyethylene tube with multiple rubber seals strips. Will be used in preference curves at 45 ° with interposed straight section instead of curves at 90 °. The connection of pipes PEH with other material must be made with special components provided by the manufacturers. All piping routes with horizontal or sub horizontal will be subject, after 'application of the shelves, a hydraulic test to ensure a perfect seal, with the following rules:
- Application of sealing caps on branch not linked;
- Packers' installation and maintenance of the same for not less than 48 hours at a pressure agreed with the DL and that they can safely assess the security of joints. Painting:
All piping, supports and manfatti black steel will be carefully protected with anti-rust paint. All machines and equipment supplied already painted must be delivered to the end of the work free of paint or scratches, otherwise the firm installation will provide at its expense to restore the damaged painting. Insulated
must be in accordance with Law 10/91 and its implementing regulations than those covered by hot water pipes and will provide protection from frost and condensation from cold water that path. pipes should be isolated individually and thicknesses determined are always measured in place. The insulation provided are:
- Piping hot water on demand, by mold retardant long fiber glass wool, finishes in thermosetting resins, thermal conductivity not exceeding 0036 W / mK, put in place wrapped with corrugated Cato, binding with wire galvanized exterior finish with sheet of aluminum;
. Cold water pipes in sight through cups or plates made of polyethylene or foam rubber, conductivity not exceeding 0036 W / mK, glued along the seams and seal them along with a special glue and tape for protection, binding with wire, galvanized iron, external finish in metal alloy.
- Piping under track, by insulating sheaths made of polyethylene closed cell foam or rubber, glued to the joints which will be protected with tape of the same material.
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