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Engineering Data

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.