【 Weak current College 】 plumbing and ventilation engineering quality (1)

I. indoor condensation water supply pipeline

1. construction preparation:

(1) cast iron pipes and fittings, galvanized carbon steel pipe and pipe fittings, water meters and valves, and other specifications are consistent with the design requirements, and the factory certification. Quality meet the requirements.

(2) conditions of indoor water supply piping installation.

1) underground pipe laying must be at the House backfill soil compaction or heart to dig into the tube bottom elevation, along the pipeline location clean, pipeline through wall has left tube holes or the installation casing, the hole size and casing specification compliant, sat
Mark, the elevation is correct.

2) concealed duct should ditch did not cover or suspended ceiling is not closed before the installation, its steel bracket should be installed and to comply with the requirements.

3) Ming installed, hanging dry pipe installation must be installed on the roof of the structure is completed. Along the pipeline installation location of the template and debris clean, Todd elevator parts are installed securely and correctly positioned.

4) risers should be installed after the completion of the main structure. High-rise buildings in the main structure, after reaching installation conditions appropriate to insert. Each layer should be clear elevation line, concealed shaft pipe, should put the vertical template and debris clean, and prevent crashes.

5 pipes should be installed) in the finished wall masonry, wall is decorated before (including concealed Branch).

2. operation process:

(1) indoor water pipeline installation:

1) drinking water pipes with galvanized steel pipe, galvanized pipe, thread connection. Damaged surface of the zinc coating and the thread now exposed portion, anti-corrosion treatment should be done.

2) indoor water supply pipeline crossing the entrance hall, living room, closet, the door in the upper part, suspended ceiling, tube and pipe effect of dew are used should anti dew insulation layer. Insulation materials and practices used by designers to determine requirements.

3) where an insulation layer and the laying of pipeline in the dark, short before the hydrostatic test must be done. Test before the subtle.

4) buried and laying in the brick wall of water pipeline, anti-corrosion treatment must meet the design requirements and construction specifications.

5) indoor water supply pipeline for valve: diameter less than or equal to 50mm, the use of ball valve; diameter greater than 50mm, use gate valve.

6) riser allow fitting location should be under health apparatus installation height. Risers on the first floor above the ground after installing the valve 500mm. Ming installed riser along column vertical laying in the corner installation should not be through sewage pool wall, so that repair, not near the urinal troughs set to prevent corrosion. Concealed riser pipe in pipe or tank. Risers by floor should be higher when the ground 20mm casing. Floor should not be set up within the standpipe of the interface. Standpipe bottom and connect three or more distribution points to the beginning of the cross tube should be removable fittings.

7) the level of hot and cold water pipes, hot water or down parallel pipes in cold water pipe top, cold water pipe in the bottom. Vertical installation and hot water pipes in cold water pipe facing left. In sanitary ware installed in cold and hot water, hot water taps should be installed in the left-oriented, cold water faucet installed on the right side of the face.

8) water pipes should not pass through the building expansion joints, settlement joint. You must travel through time shall take the necessary measures to:

A. installation of expansion joints.

B. install a rubber hose.

C. use of threads elbow spool.

9) through the basement walls or walls and underground structures should be waterproof casing.

10) residential kitchen, toilet water supply pipes net meter enclosures shall not be greater than the distance from the wall must not be less than the 10mm 30mm,. Epitope of straight pipe length before and after more than 300mm, branch pipes should be laid along the wall of bending. Kitchen countertop equipment cubicle should not prevent the water meter observation.

11) legislation on the suitable use of adjustable, reducers, easy adjustable collar stand pipe straightening. With around 300mm long short-tube connection reducers Hoop, do not use the outer screw and tapered pipe band connection.

12) water pipes should not pass through production equipment base, flue, duct, bedroom, window, wall, wood furnishings, health of the tank.

13) residential water standpipe, Center distance wall (without decoration) shall not be greater than the most distant, the most recent 100mm must not be less than the 70mm.

14) residential project kitchens, bathroom water standpipe wearing floor, walls in General can not set the casing, standpipe roots and civil suit made 20 ~ 50mm cement one degree prevent pipe root of stagnant water. If the design requires additional casing pipe casing, its high ground 50mm specifications two numbers than pipe, and closed packing sealing paste.

15) non-heating room indoor water pipes, water meters, valves should be reliable antifreeze insulation measures.

16) water supply system installation is complete, comprehensive test must meet the design requirements and construction specifications. After the completion of the delivery system should be carried out before washing.

3. preventive measures:

(1) design-time selection of good condensation of insulation required.

(2) check the condensation heat insulation quality, guarantee the tightness of the insulation layer.