How to lead out the circulating water branch pipe?

I haven't heard of any regulations. You can install it based on your own process conditions and actual site conditions.

For existing system pipelines, it is recommended to lead them from the top, mainly for the following reasons: 1. It is convenient during welding and easy to inspect after welding. 2. Precipitation will not occur at the connection and block the branch pipeline.

Generally speaking, the leading position of the supply branch pipe should be equal to or slightly lower than the elevation of the required circulating water heat exchange equipment. However, the position where the return water branch pipe merges into the main pipe must be above the top of the heat exchange equipment and slightly higher than the top elevation of the heat exchange equipment (that is, the highest point where circulating water flows through the heat exchanger) to ensure that the entire heat exchanger is filled with cooling water, thus ensuring the heat exchange effect.

Agree with lxq700918, the cooling water pipeline of the heat exchanger usually has a purge valve at the low point. I think in addition, the branch pipe should be led from the top or side as much as possible to avoid poor drainage during shutdown in winter.

Our water supply line is led out from the side, mainly because our main line is under the operating console and too close to the operating console. If it is led out from the top, it cannot be repaired.

The upper part is preferred, followed by the sides. These are all writing conventions, just like the selection of the location of the pressure tapping port of a flow or pressure gauge.

Based on the actual situation on site, consider possible problems and make a relatively appropriate positioning.

Generally speaking, the liquid branch pipe should be connected from the bottom, the gas branch pipe should be connected from the top, and the liquid branch pipe should be connected from the bottom mainly to prevent air inclusion, which is especially important for thinner branch pipes. Water flows downwards, and Qi flows upwards.

The main pipe should be led from above close to the heat exchange equipment, and the branch pipe should be led from farther away, either from above or from the side. If the main pipe is located higher than the heat exchange equipment, it should be from the side, top, or bottom. The direction of the branch pipe should be determined according to the site conditions.

Our circulating water branch pipes are all led from the top, and there are vent valves at the top of the circulating water branch pipes and return water branch pipes!

The branch pipes of circulating water are generally led from the side or upper part of the main pipe. The circulating water main pipe is generally buried underground in the installation area, which facilitates construction and prevents the deposition of sediment, scale, etc. from clogging the water inlet pipe opening. According to the density properties of water at different temperatures, it is helpful for water to fill the entire circulation system, improve the heat exchange effect, and reduce the occurrence of air lock.

First of all, thank you for your active participation. It seems that everyone's views are not very unified. Let me share my thoughts below for further discussion. Emphasize one point: The original intention is to focus on the issue of leading branch pipes from the main branch pipe. During the construction period of the project, we also communicated with the designers about this issue. According to the design opinion, the water branch pipe should be led from the bottom. The main consideration is that when the water supply pressure is insufficient, the main branch pipe will not be connected, which may cause insufficient water supply for the heat exchange equipment. ； But I think it is a bit far-fetched. At the same time, if the heat exchange equipment is above the main branch pipe, the branch pipe must be lowered to a lower point. If the heat exchange equipment is below the main branch pipe, it does not need to be lowered. Therefore, I tend to determine whether the branch pipe is led from above or below based on whether the heat exchanger is above or below the main branch pipe. I’m not sure if it’s appropriate, so please continue the discussion.