1.Filter installation
The clean-up port of the filter shall be downward, and there shall be enough working space under it; the valve stem of the gate valve shall be straight and easy to open and close
Operation: the top surface of inspection shall be level and regular.

2.Water meter installation
Water meter installation: the water meter installation of the project includes the main water meter and the water distribution meter used by the user. Main water meter installed in water plant
On the main outlet pipe, the water distribution meter is installed in front of the user’s door. When installing the water meter, the user shall pay attention to the installation direction of the water meter so that the water inlet direction is the same as the direction marked on the water meter, and the rotor type water meter shall be installed horizontally. Vertical installation is not allowed. The spiracle water meter can be installed horizontally, obliquely or vertically. When it is installed vertically or obliquely, the water flow direction must be from bottom to top. The outer shell of indoor water meter shall be 1-3cm away from the wall. If the straight pipe section before and after the water meter exceeds 30cm, it shall be bent
Wall laying. There is a certain distance between the water meter and the valve I, and the length is greater than or equal to 8-10 times of pipe diameter.

3.Flange connection installation
Check whether the convex edge of the flat welding flange is flat and the groove is complete, and the defective flange shall not be put into use;
When the steel flange is assembled with the pipe, the hole between the outer diameter of the pipe and the inner diameter of the flange shall not be more than 2mm; when the flange is welded, the pipe shall be inserted into more than half of the thickness of the flange, and the perpendicularity shall be checked in two directions with an angle of 90 ° to each other, and the perpendicularity shall be less than 0.5mm ; the flange fillet weld is welded by two hand arc welding methods, and the welding rod is e4315, which is dried in advance as required. The welding slag shall be removed after the completion of each weld, and the surface quality of the weld shall be carefully inspected. The unqualified parts must be removed for repair welding; the flange welding shall be conducted after the completion of the outer side, and the inner opening weld height shall not exceed the sealing surface; the flange fillet weld shall be subject to 100% magnetic particle or penetrant inspection, and the quality shall meet the class II requirements of jb4730-2005 standard of nondestructive testing of pressure vessels; The threaded connection of flange shall ensure the alignment of screw holes, the diameter of screw holes and bolts shall be matched, the length of connecting bolts shall be the same, the nuts shall be on the same side, and the nuts shall be extended after the bolts are tightened 2-3 buckles; the sealing gasket shall be fixed rubber gasket of Bunan flange; after the flange installation, the exposed metal parts shall be brushedTwo coats of coal tar epoxy.