Steps for commissioning a heat exchanger

When putting into use, start with cooling and then heating; when shutting down, start with heating and then cooling

The general steps for putting a heat exchanger into operation are as follows: 1. Check whether all relevant instruments are intact and functional, and whether the flange bolts on the end caps are properly tightened, etc； 2. Before filling with fluid, drain waste water, condensate, and scale from the lower parts first, vent air from the higher parts (including the tube side and shell side), and carry out displacement processes ； 3. Commissioning: First, release the air, then open the inlet valve for the cold medium to fill the heat exchanger with fluid; once it is fully filled or to a certain extent, open the outlet valve ； Gradually introduce the hot medium (more precisely, first introduce the medium whose temperature is closer to that of the surrounding environment), in order to prevent sudden influx of excessively cold or hot medium, which could cause rapid cooling or heating of the heat exchanger ； 4. After putting it into operation, check whether the readings of all instruments are normal, whether there is any leakage at the head flanges, and whether the casing is deformed or vibrating. The above are the general steps for putting a heat exchanger into use; for heat exchangers of different applications and models, there are more specific regulations and procedures. These are just my humble opinions; I welcome any feedback or criticism~

1. Before commissioning, ensure that the heat exchanger has been constructed properly; the specific conditions for commissioning include the proper installation of pressure gauges and thermometers, as well as no leaks during pressure testing. 2. Open the drain valve at the lowest point of the heat exchanger to drain any remaining water, and then close the drain valve. 3. Slowly open the cold flow inlet valve and slightly open the outlet valve. Once the cold flow passes through without any leaks, fully open both the inlet and outlet valves. If there is a bypass line, close it. Pay attention to the changes in temperature and pressure; the increase in temperature and pressure should not be too rapid to avoid leaks, with the temperature rising at a rate of less than 50°C/h. 4 Once the cold flow is operating normally, introduce the hot flow using the same method. Note: When one side is in use, the other side should be kept at vacuum or connected to the system, to prevent damage to the equipment due to pressure buildup resulting from expansion during heating. I hope this can be helpful to you

The steps for putting the heat exchanger into operation are very simple. In the case of a system that is already in use, first close the vent valves at the cold source’s inlet and outlet. Open the inlet valve slightly, then open the outlet valve slightly as well, to ensure there is no excess flow and no leaks in the other circuit. Once that is confirmed, open both the inlet and outlet valves fully. Then slowly close the bypass valve; once flow is confirmed to be unobstructed, close the bypass valve completely. Next, close the vent valve in the other circuit as well. Open the inlet and outlet valves slightly again to check for any excess flow, then open them fully. After confirming smooth flow, close the bypass valve.

When enabling the heat exchanger, first check whether the vent is closed. Start with the cold flow first, then the hot flow; when shutting down, stop the hot flow first and then the cold flow. When using it for the first time, turn on the heat flow venting first to prevent pressure buildup due to heating. During steam purging, the tube side should be purged, requiring the shell side to be vented or its inlet and outlet opened, and vice versa. Regularly check the temperature and pressure of the heat exchanger, as well as whether there are any leaks in the gland plugs and other components

Heat exchanger operation method 1: Before turning on the heat exchanger, first check whether the vent valve is closed. When enabling, the cold flow should be turned on first, followed by the hot flow. When shutting down, the hot flow should be stopped first, followed by the cold flow. 2. During startup, when the heat flow is not active, the temperature of the cold flow increases; in such cases, the heat flow vent valve or the inlet and outlet valves for the heat flow should be opened to prevent pressure buildup due to heating. When purging with steam, purge the tube side by opening the shell side vent valve or the inlet and outlet valves ； To clean the shell side, it is necessary to open the vent valve or the inlet and outlet valves on the tube side, in order to prevent pressure buildup caused by the expansion of the heated gas. Steam should be introduced slowly to prevent water hammer. 3. Regularly check whether the temperature and pressure of the heat exchanger are normal. Check for leaks in the skull, plug, flange, vent valve, etc.

This post was last edited by linweihua6 on 2012-3-6 at 11:09. The general principle for putting a heat exchanger into use is to start with the cold side before moving on to the hot side: first open the inlet for cold material, allow venting to occur for a while, then close it, and after that open the outlet for cold material. Use the same method to feed the hot material. After pouring, fully open the hot material inlet and outlet, and control the opening degree of the cold material valve based on the temperature.

For the heat exchanger, the cold medium should be introduced first, followed by the hot medium; purge and vent it before putting it into use

First introduce the hot side medium, then the cold side medium; when adding the medium, do so slowly and close the valves gradually to prevent pressure buildup and excessive fluctuations in equipment temperature