| Features |
Included for all Rock 541TM
general purpose motors |
| 2.1.2 |
Motors are designed for continuous operation or long periods
of inactivity in petroleum / chemical plant environments. |
| 2.2.2.2 |
Motor winding brace system designed to substantially exceed
5000 full voltage starts. |
| 2.2.6.2 |
Three cold/two hot starting duty. |
| 2.4.5.1.2 |
Two pole motors utilize one-piece, heat treated forged steel. |
| 2.4.5.2.5 |
Connection of rotor bars to end rings through approximately
10,000HP is via induction brazing. |
| 2.4.10.5 |
Screens will be stainless steel. |
| 2.4.10.6 |
Fan systems will be non-sparking. |
| 2.4.10.7 |
Minimum stator core plate material will be C5. |
| Features |
Available for all Rock 541TM Motors |
| 2.1.3 |
Lower than conventional noise levels. |
| 2.1.7 |
Motors are available for hazardous locations. |
| 2.4.5.1.4 |
Shaft Forgings are ultrasonically inspected. |
| 2.4.6.1.3 |
Damped unbalance response analysis. |
| 2.4.6.2.1 |
Three plane balancing of the rotor. |
| 2.4.9.5 |
Testing with contract coupling and idling adapter or mass
moment simulator. |
| Features |
Some above and beyond API 541 requirement |
| 2.3.1 |
A single VPI treatment of the stator will meet the requirements
of this paragraph. The Rock 541TM will receive a minimum of
two complete VPI treatments followed by a durable coat of
epoxy varnish. |
| 2.4.5.2.2 |
As an alternate to copper/copper alloy, cast and fabricated
aluminum rotor cages are allowed by this API paragraph. The
Rock 541TM cage material will be premium copper/copper alloy
only. |
| 2.4.5.2.3 |
Jointed rotor end rings are allowed at some speeds by this
paragraph although it is noted that rings without circumferential
joints are preferred. The end rings of Rock 541TM Motors do
not contain circumferential joints at any speed. |
2.4.7.3 |
Conventional straight fit (liner to bearing housing) sleeve
bearing liners are allowed by this paragraph. Sleeve bearing
systems provided in all Rock 541TM Motors will be of the superior
spherical seated self-aligning type. |
2.4.7.21 |
Various options are discussed for shaft/bearing seals in
this API paragraph. All Rock 541TM sleeve bearing motors utilize
nonmetallic, floating, self-aligning seals that exceed the
requirements of this paragraph. |
