What should be considered when putting a heat exchanger into use?

First use cold flow and then hot flow; it is best to measure with an outlet gauge. Be careful to prevent leaks inside the heat exchanger during use

Commissioning of the heat exchanger: 1. Check whether the drain valve of the heat exchanger is properly closed; when commissioning, introduce the cold source first and then the hot source. Open the outlet valve of the cold source and the inlet valve; then open the outlet valve and inlet valve of the hot source. Open the valves slowly, and check the heating condition in various parts of the heat exchanger ； 2. If a change in the quality of the shell-side fluid is detected during operation, it is necessary to promptly check for internal leaks in the heat exchanger. If there is internal leakage, it should be addressed promptly ； 3. When the heat exchanger is out of use, first redirect the heat source supply line, close the inlet and outlet valves of the heat source, then close the inlet and outlet valves of the cold source, and drain all the remaining oil ； 4. When putting the heat exchanger into operation, it is strictly prohibited to hold back pressure ； During use, do not adjust the flow rates of the cold and hot sources significantly via the control valve ； After deactivation, both the tube side and shell side must be depressurized.

Note: What was said on floor 3 is quite correct, but attention should be paid to point 3. If the heat exchanger is to be temporarily shut down without removing the material, it is best to close only the inlet valve while leaving the outlet valve slightly open. To prevent internal leakage of the valve from causing pressure to rise on one side of the heat exchanger’s tube or shell side, thereby damaging the heat exchanger.

Operation method of the water cooler: 1. When putting it into use, first introduce the cooling water, and then slowly introduce the heat source. 2. After the oil supply is started up, the cooling water volume should be adjusted in a timely manner according to the temperature after cooling (open the inlet valve fully and use the outlet valve to regulate the cooling water volume), in order to prevent the temperature of the heavy oil from dropping too low and causing condensation in the pipelines ； If the water supply volume is too low, the water tends to vaporize, causing water hammer. 3. When multiple coolers are used in parallel, flow imbalance should be avoided: ① Cooling water outlet temperature ≯50℃ ； ②The oil outlet temperature is the same for each cooler. 4. For the standby cooler, the upper and lower cooling water connection valves should be opened in winter. 5. When shutting down, first close the heat source inlet valve, then close the upper and lower cooling water valves. 6. If oil or bubbles are detected in the drainage, it indicates a leak in the cooler tube bundle or the small floating head; the leaking part of the cooler should be removed from the system, the pressure in the tube and shell sides should be relieved, any remaining water or oil should be drained, and the unit should be sent for repair.

3. Commissioning of the heat exchanger: 〈P〉– Ensure that fire-fighting steam is available on site at any time; 〈P〉– When commissioning a heat exchanger that handles toxic or hazardous substances, wear appropriate protective equipment. 3.1 Fill the heat exchanger with the cooling medium (see Section C.3.1). (P)– Verify that the bypass valve for the cooling medium is open; slightly open the outlet valve for the cooling medium. 3.1 Opening the heat exchanger vent valve (for media that cannot be discharged outside, open the sealed vent valve slightly) (P) – Confirm that the heat exchanger is filled with media – Close the vent valve (or sealed vent valve). 3.2 Introducing cold media – Slowly open the outlet valve for cold media in the heat exchanger – Slowly open the inlet valve for cold media in the heat exchanger – Slowly close the bypass valve for cold media in the heat exchanger. 3.3 Filling the heat exchanger with hot media (see Section C.3.3) (P) – Confirm that the bypass valve for hot media in the heat exchanger is open – Slightly open the outlet valve for hot media in the heat exchanger – Slightly open the vent valve (for media that cannot be discharged outside, open the sealed vent valve slightly) (P) – Confirm that the heat exchanger is filled with media – Close the vent valve (or sealed vent valve). 3.4 Introducing hot media – Slowly open the outlet valve for hot media in the heat exchanger – Slowly open the inlet valve for hot media in the heat exchanger – Slowly close the bypass valve for hot media in the heat exchanger

It is essential to check whether the cooling water is flowing properly between the heat-transfer media~as the valves for the coolant circulation often suffer from corrosion, leading to the detachment of their valve cores without it being detected. We once almost stopped work again right at the start due to this issue.

This post was last edited by chengkang on 2009-5-7 14:56: First, turn on the cold flow (water), then turn on the hot flow (diesel)； 2. Open the cold flow outlet, and slowly open the cold flow inlet ； 3. Open the heat flow outlet, then slowly open the heat flow inlet. Be careful not to let the temperature rise too quickly.

First introduce the cold medium and then the hot medium to prevent uneven heating. When introducing the media, let them flow through the bypass line first; then slowly close the bypass line while gradually opening the inlet valve. The introduction of the media should be done slowly and smoothly

Start with the cold flow before initiating the hot flow to prevent pressure buildup in the heat exchanger

Procedure for putting the heat exchanger into operation: 1. Check whether the equipment’s vent valve is closed； 2. First inject the cold stream, then the hot stream ； 3. First, use the bypass line; then introduce the equipment, and slowly reduce the flow through the bypass line, while paying attention to pressure changes ； 4. After it is put into normal operation, regular checks on its performance should be carried out to prevent leaks, pressure buildup, and other issues.