Tongli lecture hall Eight valves common faults and treatment methods! Learn it!
2019-09-23
Evolution of the regulation of HVAC systems
2019-09-27

1, high temperature water primary pipe network


1.1 The high temperature water pipeline adopts the compensation cold installation direct buried laying method, and the design temperature is considered at 130/70 °C.
1.2 The compensation section adopts external pressure type metal direct burial two-way or one-way corrugated compensator, adopting “L” or “Z” natural compensation at the elbow turning point and the three-way branch, and the elbow adopts R=2.5D, 90°C without Slotted elbows.
1.3 Set the intercepting well at each branch, and the high-temperature water pipeline valve adopts the all-welded ball valve.
1.4 Drainage in the drain well should be considered to set the drain pipe to be introduced into the nearby sewage well.


2, low temperature water secondary pipe network


2.1 The low temperature water pipe network can be directly or buried by means of compensation or uncompensated cold installation. The design temperature is considered at 70/55 °C.
2.2 The compensation section adopts external pressure type metal direct burial two-way or one-way corrugated compensator. It adopts “L” or “Z” natural compensation at the elbow turning point and the three-way branch. The elbow adopts R=1.5D, 90°C without Slotted elbows.
2.3 Pipes at the three-way, breakpoint, and reducer pipes should be considered for reinforcement.
2.4 Secondary network should be considered to set up a cut-off well at each branch line of the main line. The closed-water shut-off valve and the connecting valve in the well should use a fully welded ball valve. The valve with a diameter less than or equal to DN200 adopts a fully welded floating ball with a larger diameter. The DN200 valve uses a fully welded fixed ball and the drain valve uses a cast steel gate valve.
2.5 The drainage in the secondary network drainage well should be considered to be provided with drainage pipes to be introduced into the nearby sewage wells.


3, the user's low temperature water three pipe network


3.1 Pipe network is generally arranged in a dendritic form. For areas with a long heating radius (more than 500 meters) and a large number of branches of the pipe network, two or more main branches can be considered to be arranged in a ring pipe network to ensure the whole network. Hydraulic balance. The pipeline installation adopts the compensation or uncompensated cold installation direct burial laying method, and the design temperature is considered at 70/55 °C.
3.2 The compensation section adopts external pressure type metal direct burial bidirectional or one-way corrugated compensator. It adopts “L” or “Z” natural compensation at the elbow turning point and the three-way branch. The elbow adopts R=1.5D, 90°C without Slotted elbows.
3.3 Pipes should be considered for reinforcement at tees, break points and reducers.
3.4 The third network should consider setting up the intercepting well at each branch of the main line. The well-returning shut-off valve, drain valve and connecting valve should be fully welded ball valves. For all valves with diameter less than or equal to DN200, all-welded floating balls should be used. For valves with a diameter greater than DN200, a fully welded ball should be used.
3.5 user entry well
1 For the multi-storey, high-rise building users in the residential area, users in the industrial area, the return water pipeline valve, the connecting valve and the drain valve in the well are welded ball valves, and the self-operated flow controller is installed on the return pipe of the household well.
2 For the villa building in the residential area, the valve for the return water pipeline, the connecting valve and the drain valve in the well are welded ball valves, the Y-type decontamination device is installed on the water supply pipeline, and the self-operated flow controller is arranged on the return water pipeline. It is required to reserve the position of the heat meter on the water supply pipe to prepare for the future heat metering.
3.6 user indoor heating system
The 1st floor riser corridor riser requires the use of seamless steel pipe, the material is No. 20 steel, and the top of the riser is provided with an automatic exhaust valve on the return pipe. The outdoor access pipe is placed in the underground part of the house. The semi-passage trench is laid, and the buried pipe is directly buried. Easy to repair.
2 Basement unit control unit The heating system main pipe is laid in the underground garage. It is required that the control valves of each unit be set at a height of about 1.5 meters from the ground for easy operation and maintenance, and control box management.
3 User's household box All users in each community have a common household key, which is easy to manage. A copper ball valve, a lock valve, a decontamination device, a drain valve, and a hot gauge position are required on the water supply pipe in the household box; a copper ball valve, a lock valve, and a drain valve are required on the return water pipe.

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