Azbil MCB10A, User Manual

Page: 34 / 114

Instrument installation Azbil Corporation
2-12 Model MCB10A
Gasket
The recommended gasket materials are joint sheet and PTFE. For the gasket internal
diameter, follow Table 2-2. We do not recommend rubber materials, but if you use
them, follow the following precautions:
~Note • Too small a gasket internal diameter may disturb the velocity
distribution and have an adverse effect on the accuracy.
• Too large a gasket internal diameter may bring about fluid leakage.
In the case where solid materials are contained in the measured
fluid, accumulations of the solid materials may cause between a
gasket and a flange and have an adverse effect on the accuracy.
Table 2-2 Recommended gasket internal diameter of full-face gaskets
(Unit: mm)
Bore diameter
Size
15 mm
(1/2 inch)
25 mm
(1 inch)
40 mm
(1½ inch)
50 mm
(2 inches)
65 mm
(2½ inches)
80 mm
(3 inches)
100 mm
(4 inches)
Internal diameter
16.5
±1
25.5
±1
40.5
±1
52
±1
65
±1
79
±1
104
±1
If you use rubber gaskets and install with a small tightening torque, provide rubber
gaskets with the inner and external diameters shown in Table 2-3.
For some grounding ring materials, two rubber gaskets of different thickness are
required. (See Figure 2-15 on page 2-19.)
Table 2-3 Internal and external diameter of rubber gaskets 0.5 to 1 mm thick
(Unit: mm)
Bore diameter
Size
15 mm
(1/2 inch)
25 mm
(1 inch)
40 mm
(1½ inch)
50 mm
(2 inches)
65 mm
(2½ inches)
80 mm
(3 inches)
100 mm
(4 inches)
Internal diameter
16.5
±1
25.5
±1
40.5
±1
52
±1
65
±1
79
±1
104
±1
External diameter
34
±1
50
±1
75
±1
91
±1
111
±1
121
±1
146
±1
Table 2-4 Internal and external diameter of rubber gaskets 3 to 4 mm thick (Unit: mm)
Bore diameter
Size
15 mm
(1/2 inch)
25 mm
(1 inch)
40 mm
(1½ inch)
50 mm
(2 inches)
65 mm
(2½ inches)
80 mm
(3 inches)
100 mm
(4 inches)
Internal diameter
16.5
±1
25.5
±1
40.5
±1
52
±1
65
±1
79
±1
104
±1
External diameter
34
±1
50
±1
68
±1
84
±1
104
±1
114
±1
139
±1