Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 24)

Mixed Gasket Materials

Most SUPERCHANGER units are equipped with gaskets made

of one material. However, there are two conditions that dictate

the use of different material on a plate.

The ﬁ rst is gasket/ﬂ uid compatibility. In this case, one material

is not suitable for both ﬂ uids in the heat exchanger. An example

is heating quench oil with 285°F steam. Quench oil dictates the

use of nitrile rubber gaskets, while steam temperature requires

EPDM gaskets.

The second reason for using two gasket materials on a single plate

is cost. This is encountered when an expensive material (usually

viton) is required on only one side of the SUPERCHANGER

unit. A signiﬁ cant savings can be realized by using a less expensive

gasket material on the other side.

As an example: Cooling 180°F sulfuric acid with tower water

requires viton on the acid side, but nitrile is sufﬁ cient on the

water side.

Each plate has contact with both ﬂ uids in a SUPERCHANGER

unit. One ﬂ uid travels across the plate while the other ﬂ uid

passes through the gasketed port holes. In a mixed gasket unit,

each plate will have two materials. The ﬂ uid traveling across the

“A” plate requires gasket material 1. The ﬂ uid on the “B” plate

requires gasket material 2.

In the case of a UX, SX, GF or GC series model, the “A” plate

will have material 1 on the perimeter while port holes 3 and 4 are

material 2. The “B” plate will have material 2 on the perimeter

with port holes 1 and 2 of material 1. GX models with mixed

gaskets would be similar. However, ﬂ ow is diagonal so diagonally

opposed ports would have the same gasket material.

All SUPERCHANGER gaskets are purchased as one piece-

molded items. To physically accomplish mixing gaskets on a

plate, the port holes are cut from both gaskets. Subsequently,

the port holes of material 1 are matched with the perimeter of

material 2 and vice versa. (See Figure 36.)

The following illustrates the above in a typical UX Series plate.

Figure 36

Multiple gasket materials on a UX Series plate.

“A” plate

“B” plate

= Gasket Material 1

= Gasket Material 2

Fluid on “A” plate uses port

holes 1 and 2.

Fluid on “B” plate uses port

holes 3 and 4.

NOTE: Chevron orientation as related to

“A” & “B” plates.

Porthole designations shown apply to all

units purchased after June 1, 2002. Refer to

unit drawing or previous IOM (SC-IOM-9) for

older UX, SX, S, GC or TW series.

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Velocity Edge GX325 Manual de usuario Pagina 24

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