Goulds Pumps 3355 - IOM - Manual (Page 46)

Maintenance
Area D - Gap between the impeller and diffuser
Pump size Nominal Gap "new" (inches) Maximum
diameter permissible gap
All iron and stainless fitted Stainless steel
Minimum Maximum Minimum Maximum
1.5 x 2.5-7 3.346 0.006 0.008 0.012 0.014 0.020
2.5 x 4-8 4.134 0.006 0.008 0.012 0.014 0.020
4 x 5-10 5.315 0.006 0.008 0.012 0.014 0.020
5 x 6-11 6.693 0.006 0.008 0.012 0.014 0.020
Area E - Gap between the shaft and discharge casing
Pump size Nominal Gap "new" (inches) Maximum
diameter permissible gap All iron and stainless fitted Stainless steel
Minimum Maximum Minimum Maximum
1.5 x 2.5-7 1.575 0.004 0.006 0.010 0.012 0.020
2.5 x 4-8 1.772 0.004 0.006 0.010 0.012 0.022
4 x 5-10 2.047 0.006 0.008 0.012 0.014 0.022
5 x 6-11 2.441 0.008 0.010 0.012 0.014 0.024
Area F - Gap between the bearing sleeve and bearing bushing
Pump size Nominal Gap "new" (inches) Maximum
diameter permissible gap
All iron and stainless fitted Stainless steel
Minimum Maximum Minimum Maximum
1.5 x 2.5-7 1.378 0.002 0.003 0.002 0.014 0.020
2.5 x 4-8 1.575 0.002 0.003 0.002 0.014 0.020
4 x 5-10 1.772 0.002 0.003 0.002 0.014 0.020
5 x 6-11 2.362 0.003 0.004 0.003 0.014 0.020
Nozzle loads
Direction of forces
• Fx = force along the x - axis
• Fy = force along the y - axis
• Fz = force along the z - axis
Direction of moments
• Mx = moment around the x - axis
• My = moment around the y - axis
• Mz = moment around the z - axis
Formula
44 Model 3355 Installation, Operation, and Maintenance Manual