Alfa Laval Plates Heat Exchanger Refurbishment Service Process

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Alfa Laval Plates Heat Exchanger Refurbishment Service Process

2021-08-11 14:36:07

Check before cleaning
First, Alfa Laval will inspect your heat exchanger to see if the plates are severely corroded and deformed. Alfa Laval technicians decide whether these plates need repair or replacement.
Remove the gasket (rubber gasket)
Alfa Laval uses an efficient and gentle method to remove the gasket (rubber gasket) with liquid nitrogen. At the same time, Alfa Laval will ensure that the recording package will not be damaged.
Pre-cleaning
If serious contamination occurs, high-pressure water will be used to pre-clean the plates.
Chemical cleaning
The plates are immersed in a special chemical bath. The concentration, temperature and shelf life have been strictly adjusted, and all sediments can be gently and effectively removed.
Professional equipment washing
After cleaning in the previous step, the heat exchanger plate enters our professional equipment. This is a device with a rotating nozzle inside, which can remove the deposits on the plate and leave no residue. Currently, this type of mechanical cleaning is unique to Alfa Laval during the repair process.
Flaw detection test
If necessary, each panel should be individually sprayed with paint impregnant and inspected under UV light to detect cracks. In addition, use special tools to check whether all plates are deformed to ensure proper sealing during installation.
seal
Alfa Laval uses high-quality rubber gaskets to seal the plates. Alfa Laval's rubber pads use two-component epoxy adhesives that require high-temperature curing in an oven.
Assembly
After the heat exchanger plates are assembled, carry out a pressure test to completely eliminate leakage.
Final repair report
Finally, you will receive a detailed report on the heat exchanger repair service, including process documentation and results-based recommendations.
Alfa Laval Plates Heat Exchanger Refurbishment Service Process you can browse related products and initiate consultations on our website.

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Method for cleaning vicarb heat exchanger plate

2020-02-06 17:25:09

Vicarb heat exchanger plates have been widely used in some areas such as central heating and chemical industry. The plate heat exchanger has a good heat exchange effect, but it is prone to produce scale and impurities, which will block the flow of the plate heat exchanger and reduce the heat exchange effect. So, how to clean the plate heat exchanger?Plate heat exchangers can be disassembled and recirculated.

Disassembly and cleaning steps:
Disassembly and cleaning can clean both processes of the heat exchanger. The main steps are:
1. Close the two water inlet and outlet valves of the heat exchanger;

2. Measure the distance between the baffles of the heat exchanger and make a record;

3. Disassemble the plate heat exchanger, empty the medium in the equipment, disassemble in the prescribed order, and make a record. Be careful not to damage the gasket and the plate during the disassembly process;

4. During the cleaning process, the plates should be cleaned piece by piece, and soaked and washed. In the case of high-pressure cleaning, the cleaning should be performed below the specified pressure;

5. After processing, put it back in the plate heat exchanger baffle in the original order, paying attention to distinguish the front and back. Control the strength when tightening the clamping bolts firmly, otherwise it is easy to crush the plate;

6. Open the outlet valve and inlet valve of the plate heat exchanger to see if there is any leakage. If there is no leakage, the cleaning is complete.

Cycle cleaning steps:
If it is used in the chemical industry, firstly close the inlet and outlet valves of the plate heat exchanger, and add the cleaning agent to the system through a tube pump or a water tank for internal circulation until the concentration of the cleaning agent no longer changes and the impurities in the equipment are discharged.

If it is a passivation treatment, it is necessary to ensure that after the chemical descaling is completed, no rust or other phenomena will occur in the pipeline. The amount of passivation cleaning solution needs to be determined according to the amount of water during cleaning, and the ph value cannot be too high, otherwise the effect will be poor, and it will be discharged after six hours.

Finally, the plate heat exchanger was restored, and the inlet and outlet water valves were opened, indicating that the cleaning was completed.
The role and advantages,disadvantages of plate heat exchangers

2020-01-27 17:14:32

Plate heat exchangers are a type of mobile device that transfers heat between metal plates because the liquid is spread over more surfaces, which increases the exchange rate. Metal tubes are used to heat fluids.

The role of plate heat exchangers
The plate heat exchanger is based on different external and internal components, the welding plate exchange plates are welded together, and the brazed plate type construction model is vacuum brazed. In many cases, in order to make smaller sections work better, some chambers are designed to be thinner, allowing most of the liquid to contact the plate, improving heat transfer.

The plate heat exchanger can play a good heat transfer effect in the boiler heating in winter. In the daily use process, it is necessary to do a good job of protecting this equipment. The plate heat exchanger is a kind of equipment that can play multiple benefits and functions for us. The user clearly knows its role and protects it so that it can play a greater role.

Advantages of plate heat exchangers
High heat transfer coefficient. The plate heat exchanger has a small flow channel, the plates are wavy, and the cross-section changes are complex, which makes the flow direction and velocity of the fluid constantly change, which increases the disturbance of the fluid and has a high heat transfer coefficient.

Great adaptability. The required heat transfer area can be achieved by increasing or decreasing the plate. A heat exchanger can be divided into several units, which can be used for heating or cooling between several fluids at the same time.

Compact structure, small size and few consumables. The heat transfer area per cubic meter volume can reach 250m², and the heat transfer surface per square meter only needs about 15kg of metal.

Dirt factor is small. Due to the large flow disturbance, dirt is not easily deposited. The plate heat exchanger plate is of good material and has little corrosion, which makes its fouling coefficient value smaller. Plate heat exchangers mainly use metal plates, so the price of raw materials is cheaper than the same metal pipes.

Disadvantages of plate heat exchangers
1) Poor sealing and easy to leak. The gasket needs to be replaced frequently, which is troublesome.
2) The use pressure is limited, and generally does not exceed 1MPa.
3) The use temperature is limited by the temperature resistance of the gasket material.

Gasketed Plate Heat Exchanger VHX151

2019-07-29 11:11:14

VHX supply gasketed plate heat exchangers from 0.03m2 to 1.8m2 for different application requirements. We manufacture plate heat exhcanger for replacement models and our own brand models, available calibre from DN25 to DN350.

gasketed plate heat exchanger

Model	Height	Width	Min Standard Length	Max Standard Length	Vertical Port Distance	Horizontal Port Distance	Connection
VHX25	480	180	20	350	357	60	DN25
VHX51	940	330	35	600	640	140	DN50
VHX52	920	320	25	450	640	140	DN50
VHX61	835	325	50	630	625	130	DN65
VHX62	1085	325	50	630	875	130	DN65
VHX101	1084	470	120	950	719	225	DN100
VHX102	1084	470	80	640	719	225	DN100
VHX103	1235	500	115	1125	882	234	DN100
VHX104	1655	500	115	1125	1302	234	DN100
VHX151	1885	650	235	1410	1294	298	DN150
VHX152	1885	610	160	1255	1294	298	DN150
VHX201	2055	730	235	1645	1478	342	DN200
VHX301	2086	1125	215	2580	1320	600	DN300
VHX351	2920	1190	210	3360	1842	596	DN350

Available plate material: AISI304/AISI316/Titanium/Nickel/Alloy C-276/254 SMO
Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
Available connection material: rubber/stainless steel/unlined/flange

Plate heat exchanger VHX102

2019-07-29 11:11:14

VHX supply plate heat exchangers from 0.03m2 to 1.8m2 for different application requirements. We manufacture plate heat exhcanger for replacement models and our own brand models, available calibre from DN25 to DN350.

Model	Height	Width	Min Standard Length	Max Standard Length	Vertical Port Distance	Horizontal Port Distance	Connection
VHX25	480	180	20	350	357	60	DN25
VHX51	940	330	35	600	640	140	DN50
VHX52	920	320	25	450	640	140	DN50
VHX61	835	325	50	630	625	130	DN65
VHX62	1085	325	50	630	875	130	DN65
VHX101	1084	470	120	950	719	225	DN100
VHX102	1084	470	80	640	719	225	DN100
VHX103	1235	500	115	1125	882	234	DN100
VHX104	1655	500	115	1125	1302	234	DN100
VHX151	1885	650	235	1410	1294	298	DN150
VHX152	1885	610	160	1255	1294	298	DN150
VHX201	2055	730	235	1645	1478	342	DN200
VHX301	2086	1125	215	2580	1320	600	DN300
VHX351	2920	1190	210	3360	1842	596	DN350

Heat Exchanger Plate VHX25

2019-07-04 16:15:04

VHX supply heat exchanger plates from 0.03m2 to 1.8m2 for different application requirements. We manufacture plate heat exhcanger for replacement models and our own brand models, available calibre from DN25 to DN350.

Model	Height	Width	Min Standard Length	Max Standard Length	Vertical Port Distance	Horizontal Port Distance	Connection
VHX25	480	180	20	350	357	60	DN25
VHX51	940	330	35	600	640	140	DN50
VHX52	920	320	25	450	640	140	DN50
VHX61	835	325	50	630	625	130	DN65
VHX62	1085	325	50	630	875	130	DN65
VHX101	1084	470	120	950	719	225	DN100
VHX102	1084	470	80	640	719	225	DN100
VHX103	1235	500	115	1125	882	234	DN100
VHX104	1655	500	115	1125	1302	234	DN100
VHX151	1885	650	235	1410	1294	298	DN150
VHX152	1885	610	160	1255	1294	298	DN150
VHX201	2055	730	235	1645	1478	342	DN200
VHX301	2086	1125	215	2580	1320	600	DN300
VHX351	2920	1190	210	3360	1842	596	DN350