Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 32)

Replacing Plates

A faulty plate can easily be removed and replaced by a spare plate.

Check that the new plate has the holes and gaskets arranged in the

same way as the faulty one, and that the hangers are arranged in

the same direction as the original installation. When the plates are

properly assembled, the edges form a “honeycomb” conﬁ guration

as seen in Figure 43.

If a four-hole plate is defective and no spare plate is available, the

defective plate and one adjacent four-hole plate can be removed.

The capacity of the plate heat exchanger is then reduced, but

usually only slightly. When plates are removed calculate new

“A” tightening dimensions from Table 3.

Removing Old Gaskets

When a gasket requires replacement, steps A1, A2 and A3 may

be followed or alternately steps B1, B2 and B3 may be used if

facilities are available.

A1. Remove the plate from the frame and lay it on a clean,

ﬂ at, horizontal surface. Examine and note exactly how the

gasket is positioned on the plate, particularly what grooves

the gasket does and does not occupy.

A2. Insert a pointed tool (screw driver) under the gasket until

a ﬁ nger can be inserted. Then pull slowly until the gasket

is removed.

A3. Clean the gasket groove. Adhesive residue, oil, grease and

other foreign matter can be removed by applying a solvent

such as Methyl Ethyl Ketone (MEK), Acetone or other

Ketones with a nylon or stainless steel brush. Commercial

paint stripping compounds are also effective in removing

the gasket adhesive. Dry/wipe the gasket groove. (NOTE:

Use all solvents at room temperature (70°F) and in a well

ventilated area not exposed to open ﬂ ame, electric motors,

etc.) Torches, grinding wheels and powered steel wire

brushes are not to be used to remove adhesive residue since

such tools will damage the plates.

B1. When a gasket requires replacement, remove the plate from

the frame and lay it on a clean, ﬂ at, horizontal surface.

Examine and note exactly how the gasket is positioned

on the plate, the orientation of the bleed grooves and

particularly what grooves the gasket occupies.

B2. For gasket removal, immerse the plate assemblies in a

10% to 15% caustic bath solution at 140°F to 180°F for

approximately 8 hr. The caustic will soften the glue and

the gaskets can be removed. Brushing with a nylon brush

will help remove the softened residual glue. (NOTE: Soak

time will vary depending on the type of service and the

length of exposure that the plates have seen.)

B3. The caustic solution will normally remove most of the

residue scale buildup on the heat transfer surface. Brushing

with a nylon brush will help remove excess residue. Always

rinse thoroughly.

To remove spot-glued gaskets, follow steps A1, A2 and, if

necessary, step A3.

Remove scale deposits, such as calcium compounds, by immersing

the plates in a 5% to 10% nitric acid solution at room temperature

(70°F). This procedure must be followed by a thorough rinsing.

See “Plate Cleaning Tips” on page 38.

Figure 43

Plate assembly.

Replacing Gaskets

See Figures 4, 5, 6, 7 and 36.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 47 48

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Velocity Edge GX325 Manual de usuario Pagina 32

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