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Welding, brazing and allied
3.4.11 Welding, brazing, and allied processes
processes shall conform to MIL-STD-248 and MIL-STD-278.
3.4.12 Piping.  Piping connections shall be in accordance with MIL-STD-438
for submarine vessel applications and MIL-STD-777 for surface vessel applications.
3.4.13 Housing. Housings, casings, covers, and bases shall be constructed
of materials in accordance with table I.  For applications where weight is
critical, aluminum parts in accordance with table I may be used, if specified
(see 3.4.8 through  Housing guards shall be removable.
3.4.14 Lifting.  Provisions or arrangements shall be made for lifting parts
which weigh more than 35 pounds.
3.4.15 Weight.  Weight of clutches shall be plus or minus 5 percent of the
weight specified on the drawings.
3.4.16 Marking. Match marking.  Parts that may affect balance if not reinstalled to
their original position, or are individually fitted, shall be marked so that they
may be reinstalled in their original position. Part identificati on.  Major clutch parts and subassemblies shall be
marked to indicate contract number, manufacturer, date manufactured, and manufac-
turer's assembly or detail drawing number.  Proprietary marking may be added at
the discretion of the contractor. Mark application.  Marks shall be applied in accordance with
MIL-STD-792 in an area of low stress.  Depth of marking shall not exceed 0.020
Clutch special features shall be as specified
3.4.17 Special features.
(see 6.2).
Type I nonpositive drive hydraulic cl utch (fluid drive).
3.5.1  Construction.  The nonpositive drive hydraulic clutch (fluid drive)
shall consist of a driving rotor or simplified centrifugal pump runner, and a
driven rotor or simplified hydraulic turbine runner.  Each rotor shall consist
of a ring of approximately semicircular cross section.  An inner ring, of approxi-
mately semicircular cross section held concentrically with the first by a number
of radial ribs, may be used.  The two rotors together shall form a ring of
approximately circular cross section and a smaller similar ring within it. The
annular space between these two rings shall thus form a closed circuit or vortex
ring for the circulation of the liquid when the driving rotor is rotated.  Means
shall be provided to take the thrust developed by the clutch in both directions.
Primary and secondary rotors shall be separated to the extent necessary to allow
for thermal expansion and possible misalignment and shall be of welded construc-
tion, or machined from solid forgings, or cast of aluminum alloy, as specified
(see 6.2).  The clutch shall be of the twin type when necessary to reduce the
overall diameter.

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