 |
|||
|
|
|||
| ||||||||||
|
|  MIL-C-16645A(SHIPS)
(e) Satisfactory operation when inclined as follows:
(1) Up to 15 degrees in any direction (permanently inclined).
(2) With the ship rolling up to 45 degrees from the vertical to either side,
(3) With the pitching 10 degrees up and down from the normal horizontal
plane.
(f) Minimum space and weight.
3.3.2 Unless otherwise specified in the contract or order the following design conditions shall be
assumed:
(a) Ambient and intake air temperature -
Fahrenheit (F. ),
(b) Intake air pressure - 14.7 p.s.i. absolute.
(c) Relative humidity - 50 percent,.
F.
(d) Maximum permissible temperature of air leaving the aftercooler -
(e) Temperature of cooling w ater at inlet - 85 F,
(f) Kind of cooling water - sea (salt).
3, 3.3 Piston speed. - The piston speed shall not exceed 800 feet per minute.
3. 3.4 Gage board, drain valves and all features of an operational nature shall be located on or
operable from one side, designated as the operating side of the compressor, so as to be accessible
if the compressor is installed adjacent to a bulkhead.
2.5 The crank case, frame, housing, cylinders, and other fixed parts or attached components
of the assembly shall be rigidly secured and held in alignment by dowel pins, fitted bolts, keys,
rab beted or tongue and groove joints or other suitable means.
3. 3.6 Air cylinders and heads. - The cylinders and heads shall be provided with ample water-
jackets (see 3. 3.15. 1. 1). So far as practicable hand-holes shall be provided for access to the jacket
spaces. Cylinder liners shall be held rigidly in place. The liners shall be counterbored slightly at the
ends to permit the piston rings to override the working bore to avoid the formation of shoulders. The
design and machining of cylinders and liners shall be such that the complete piston assembly can be
removed and replaced. To this end all shoulders where piston rings may catch shall be avoided and
liners shall be properly beveled,
3. 3. 7 Connecting rods. - The lower end of connecting rods shall be arranged for renewal of crankpin
bearings which shall be of thin shell precision type, Bolts and nuts for securing crankpin bearings
shall be positively locked, The upper end of connecting rods connected to crossheads or pistons shall
be fitted with renewable bearings, Provision for adjustment shall be made as required for proper
operation and maintenance of the compressor. Any take-up bolts and nuts shall be positively locked.
Upper end of connecting rods snail be of one-piece construction.
3. 3.8 Crankshaft. - The crankshaft shall be a single forging. The cranks shall be arranged to
give the best possible running balance. Counterweights shall be fitted if necessary. The design of the
shaft shall be such as to permit convenient use of a portable tachometer.
3. 3.9 Flywheels. - Each compressor shall be equipped with a flywheel of sufficient size to provide
smooth running of the compressor and motor. Flywheels shall be keyed to the crankshaft and shall be
pressed or securely clamped thereon. A separate flywheel will not be required if ample flywheel effect
is provided by the sheave.
3.3.10 Main and thrust bearings. - Main bearings shall be readily renewable, The main bearing
shall preferably be of the tapered roller bearing type in accordance with Specification FF-B-185 which
shall be so arranged as to take up the thrust due to roll and pitch of the vessel. Consideration will be
given to the use of deep groove or angular contact type ball bearings in accordance with Specifica-
tion FF-B-171.
5
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals