Velocity Edge GX325 Instrukcja Użytkownika Pobierz pdf (Strona 15)

Figure 18

Flow arrangement.

A side

B side

*No number indicates that ﬂ uid passes through

all four holes in the plate.

Drains

T h e r e a r e t h r e e m e t h o d s u s e d f o r d r a i n i n g

SUPERCHANGER units:

1. One pass/one pass (also two pass/two pass with all lower

nozzles, but not shown) units can be drained by opening

the piping to the lower nozzles or by opening drain valves

that can be provided in the ﬁ eld in the connecting piping.

See Figure 19.

2. Multi-pass units may require factory installed drains, i.e., an

additional nozzle in the end frame. These must be factory

installed. See Figure 19.

3. If the number of passes is greater than four as in Figure 20,

the above options require the addition of small holes in

plate corner sections as shown in Figure 22. The amount

of by-pass through these holes is negligible and there is

no possibility of ﬂ uid intermix. These drain holes in the

element composition diagram (Figure 21) are noted by

•

as the small hole is always placed in the corner without a

passage hole. For example, 1204 is changed to 12

•

4 if

a drain hole is present. The size and position of the drain

hole is separately speciﬁ ed.

NOTE: On multi-pass units that are sized for a close temperature approach, these drain holes are not provided due to the small amount of

bypassing that occurs. Check the drawing to determine whether drains are present.

Figure 19

One pass—one pass.

B side

A side

Field supplied drain

Factory installed drains

through frame

Plate sequence no.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 47 48

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Velocity Edge GX325 Instrukcja Użytkownika Strona 15