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Victaulic Gasket Installation
1. Inspect supplied gasket to be certain it is suited for
intended service (code identifies gasket grade). Apply a
thin coat of silicone lubricant to gasket tips and outside
of gasket.
2. Install gasket, placing gasket over pipe end and making
sure gasket lip does not overhang pipe end. Refer to
the following figure for gasket configuration.
3. Align and bring two pipe ends together and slide gasket
into position centered between the grooves on each
pipe. No portion of the gasket should extend into the
groove on either pipe.
4. Open fully and place hinged Victaulic® flange around
the grooved pipe end with the circular key section
locating into the groove.
5. Insert a standard hex head screw through the mating
holes of the Victaulic® flange to secure the flange firmly
in the groove.
Table 12. Installation data for 150 psig (1034.2 kPaG) flange adapters (Style 741)
Nominal Pipe Size
in.
mm
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
(a)
Screw size for conventional flange-to-flange connection. Longer screws are required when flange washer must be used.
Screw-Tightening Sequence for
Water Piping Connections
This section describes a screw-tightening sequence for
flanges with flat gaskets or O-rings. Remember that
improperly tightened flanges may leak.
Note: Before tightening any of the screws, align the flanges.
Flanges with 8 or 12 Screws
Tighten all screws to a snug tightness, following the
numerical sequence for the appropriate pattern as shown
in the following figure. Repeat this sequence to apply the
final torque to each screw.
CDHH-SVX003C-EN
Assembly Screw
Number of Assembly
Size
(a)
Screws Required
in.
3/4 x 3-1/2
7/8 x 4
7/8 x 4
1 x 4-1/2
1 x 4-1/2
1-1/8 x 4-3/4
1-1/8 x 5-1/4
1-1/4 x 5-3/4
6. Tighten fasteners alternately and equally until housing
screw pads are firmly together (metal-to-metal); refer to
"Screw-Tightening Sequence for Water Piping
Connections," p.
fasteners.
Note: Uneven tightening may cause the gasket to pinch.
Figure 21. Typical Victaulic
configuration
Screw Pattern Diameter
in.
8
11.75
12
14.25
12
17
12
18.75
16
21.25
16
22.75
20
25
20
29.5
Figure 22. Flange screw tightening sequence (8 or 12
screws)
7
1
4
8
2
6
8 screws
Flanges with 16 or 20 Screws
Tighten only the first half of the total number of screws to a
snug tightness, following the numerical sequence for the
appropriate pattern as shown in the following figure. Next,
sequentially tighten the remaining half of the screws in
numerical order.
Installation: Water Piping
33. Do NOT excessively tighten
®
flange gasket
Weight
mm
lb
298
16.6
362
24.2
432
46.8
476
62
540
79
578
82.3
635
103.3
749
142
1
5
12
5
8
4
3
10
6
2
12 screws
kg
7.5
11
21.2
28.1
35.8
37.3
46.9
64.4
9
3
7
11
33
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