Click here to make your Home Page

Page Title: Ordering data
Back | Up | Next

Click here for thousands of PDF manuals




Information Categories
.... Administration
Food and Cooking
Nuclear Fundamentals


6.1 Ordering data. - Procurement documents should specify the following:
Title, number, and date of this specification.
Service (see 1.2). Whether motor is for submarine service (see
Ambient temperature (see 3.1.1).
Voltage (see 3.1.3).
Duty (specified time of duty cycle) (see 3.1.7).
Enclosure (see 3.1.8, and 3.1.28.l(a)).
Horsepower and speed ratings (see 3.1.9).
R.p.m. and speed (see 3.1.10).
Type (see 3.1.11).
End shield design (see 3.1.17).
Type of bearings (see and if ball bearings are required, specify type (see
Class of insulation (see 3.1.27).
Encapsulation (see 3.1.28).
Number of motors per ship (see
(o) Repair sets of gears (see table VII).
(p) Degree of balance if other than standard (see
(q) Level of preservation, packaging, packing and marking required (see 5.1).
6.2 Definitions. - The following definitions shall apply to the various technical terms wherever such terms
appear in this specification:
6.2.1 Continuous duty. - Continuous duty is a requirement of service that demands operation at a sub-
stantially constant lead for an indefinitely long time (see
6.2.2. Intermittent duty. - Intermittent duty is a requirement of service that demands operation for
alternate intervals of (a) load and no-load, (b) load and rest, or (c) load, no-load, and rest (see
6.2.3 Varying duty. - Varying duty is a requirement of service that demands operation at loads and for
intervals of time, both of which may be subject to wide variation (see
6.2.4 Short-time duty. - Short-time duty is a requirement of service that demands operation at a sub-
stantially constant load for a short and definitely specified time (see
6.2.5 Constant-speed motor. - A constant-speed motor is one of which the normal speed of operation
is constant or practically constant; for example, a synchronous motor or an induction motor with small slip
(see 3.1.10).
6.2.6 Multispeed motor. - A multispeed motor is one which can be operated at any one of two or more
definite speeds, each being practically independent of the load. In the case of multispeed permanent-split
capacitor and shaded pole motors, the speeds are dependent upon the load (see 3.1.10).
6.2.7 Varying speed motor. - A varying speed motor is one the speed of which varies with the load,
ordinarily decreasing when the load increases, such as a high-slip motor (see 3.1.10).
6.2.8 Adjustable varying speed motor. - An adjustable varying speed motor is one the speed of which
can be adjusted gradually, but when once adjusted for a given load, will vary in considerable degree with
change in load, such as a wound rotor induction motor (see 3.1.10).
6.2.9 Front (of motor). - The front of a motor is the end opposite the coupling.
6.2.10 Back (of motor). - The back of a motor is the end which carries the coupling or driving pulley.
6.2.11 Capacitor-start motor. - A capacitor-start motor is a capacitor motor in which the capacitor phase
is in the circuit only during the starting period (see 3.1.11).
6.2.12 Permanent-split capacitor motor. - A permanent split capacitor motor is a capacitor motor having
the same value of capacitance for both starting and running conditions (see 3.1.11).

Privacy Statement - Press Release - Copyright Information. - Contact Us