MIL-PRF-20042E
diameter of which shall be not less than the bore of the hub shown as diameter
"S" on figure 2. Unless otherwise specified (see 6.2), the silver brazing
alloy used shall conform to BCuP-5 of QQ-B-654. Machining details shall be as
specified in tables XVI and XVII. Dimensions noted on figures 1 and 2 shall
be as specified in tables VI through XV.
3.4 Type EF, without preinserted rings (end or face feed type). Type
EF flanges shall be chamfered at the outer end of socket a distance of 0.031
inch and at an angle of about 45 degrees with the axis at the socket.
3.5
Machining.
3.5.1 Flange finish. The machined surface finish of gasket mating
surfaces on the flanges shall be in accordance with ASME B46.1 and as follows:
(a)
For flanges of a nominal size of 12 inches or less, a finish
with a circular lay (concentric) of 500 to 1000
or (spiral) 125 to 250 roughness average (Ra) produced
by machining 30 to 80 serrations of uniform depth per inch
of flange face width.
(b)
For flanges over a nominal size of 12 inches, the require-
requirements shall be the same except that 21 to 80
serrations per inch of flange face width may be used.
Unless otherwise specified (see 6.2), flanges shall have the bore of the hub
and the waterway (diameters "S" and "T" as shown on figure 2) machined with a
finish of 125 or better. Flanges need not be finished on the rim, provided
they are cast smooth and true. The remaining external surfaces shall not be
finished except for bolt hole spot facing.
FIGURE 1.
Detail dimensions of groove for preinserted ring
of silver brazing alloy.
4
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