01
Before dismantling the plate heat exchanger, the dimensions of the compression length of the plate bundle should be measured and recorded (reassembly should be according to this dimension).
02
If the sealing gasket is stuck in the groove between the two plates, it is necessary to use a screwdriver to separate them carefully, the screwdriver should be inserted from the part that is easy to peel off first, and then separated along its periphery, so as not to damage the heat exchanger plate and the sealing gasket.
03
When replacing the new sealing gasket, you need to use acetone or other ketone organic solvents, the sealing gasket groove clean. Then use a brush to apply synthetic resin adhesive evenly into the grooves.
04
Check the heat exchanger plate for perforation, usually with a five times magnifying glass, and sometimes with a light or paraffin penetration method, such as piece-by-piece inspection.
05
If it is found that there is debris accumulation in the short pipe and channel of the media inlet and outlet, it means that the filter is invalid and should be cleaned in time.
06
There are three cleaning methods for the plate, namely, backwash method (without disassembling and cleaning), manual cleaning method (disassembling and cleaning), and chemical cleaning method (without disassembling and cleaning).
Manual cleaning method: heat exchanger plate scale thickness is very thin and insoluble in water, it can be disassembled, piece by piece with water under pressure (0.1 ~ 0.2MPa) or with water with a low-pressure steam jet scrubbing treatment for water is difficult to scrub the precipitate, it can be used to scrub the soft fibre brushes, bristles brush to scrub.
Chemical cleaning method: the surface of the heat exchanger plate, especially the dead space of the media flow, there are hard deposits (oxides or carbides), manual cleaning method is difficult to solve, according to the heat exchanger plate material and take different chemical solvents to clean.
07
Heat exchanger plate scarring, do not use a wire brush or wire brush to scrub, especially stainless steel plate, in order to prevent accelerated corrosion of the plate. If there is a stain or rust on the plate, can be removed with stain remover.
08
The water used for cleaning must be free of salt, sulphur and other ingredients.
09
Heat exchanger plate with chemical cleaning, must be cleaned with water, and then wiped with fine gauze, placed in a clean place for spare.
10
When dismantling the plate of titanium, it is strictly prohibited to contact with open flame to prevent oxidation.
11
Check the sealing gasket for aging, deterioration, cracks and other defects, prohibit the use of hard objects in the surface scratching.
12
Sealing gasket and heat exchanger plate sheet surface (in the groove) is strictly prohibited the accumulation of solid particles, such as sand, iron slag, etc..
13
Check whether there is local deformation of the heat exchanger plate piece, exceeding the permissible value, should be repaired or replaced.
Translated with DeepL.com (free version)
