Comparing Bearings:
| EnviroPump | Goulds | Durco | Durco | |
| ANSI Group 1 | VIT-500 | ST/STX | Mark III | Mark II |
| Thrust Bearing | 7210 x 2* | 5306 | 5306 | 5305 |
| Radial Bearing | 6209 | 6207 | 6207 | 6206 |
| ANSI Group 2 | VIT-1000 | MT/MTX | Mark III | Mark II |
| Thrust Bearing | 7313 x 2* | 5309 | 5310 | 5310 |
| Radial Bearing | 6312 | 6309 | 6310 | 6310 |
* Double row bearings, with machined brass cages, mounted back
to back according to API-610 pump standard.
Compare Bearing Life:
(Dynamic Load Rating)
The higher the load rating (lbs), the longer the life.
Dynamic Load Rating (lbs)
| EnviroPump | Goulds | Durco | Durco | |
| ANSI Group 1 | VIT-500 | ST/STX | Mark III | Mark II |
| Thrust Bearing | 14300 | 9360 | 9360 | 6910 |
| Radial Bearing | 7460 | 5730 | 5730 | 4380 |
| ANSI Group 2 | VIT-1000 | MT/MTX | Mark III | Mark II |
| Thrust Bearing | 39100 | 16400 | 19200 | 19200 |
| Radial Bearing | 18400 | 11900 | 13400 | 13400 |
Compare Life Rating Factor:
This is calculated by the ratio of Dynamic Load Rating (Brg. A ÷ Brg. B)³.
Life Rating Factor:
| ANSI Group 1 | EnviroPump vs. Goulds |
EnviroPump vs. Durco III |
EnviroPump vs. Durco II |
| Thrust Bearing | 3.57 | 3.57 | 8.87 |
| Radial Bearing | 2.20 | 2.20 | 4.93 |
ANSI Group 2 |
|||
| Thrust Bearing | 13.53 | 8.46 | 8.46 |
| Radial Bearing | 3.71 | 2.58 | 2.58 |
In all cases, EnviroPump and Seal’s standard bearings will outlast Goulds or Durco
standard bearings by a minimum of twice as long.
Compare Bearing Frame Oil Volume:
(Pints-approx)
| EnviroPump VIT |
Goulds ST STX |
Durco Mark II/III |
|
| ANSI Group 1 | 3.1 | 0.4 0.7 | 0.5 |
| ANSI Group 2 | 3.9 | 0.8 2.6 | 1.7 |
| Lubrication | Oil Mist | Flood | Flood |
Large oil sump has a significant effect on bearing operating temperature.
Oil mist lubrication can reduce bearing temperature by as much as 70° F.
Bearing L10 life increases 2000 hrs. for every 10° F reductiion.