Viking pump SG-04 SERIES Technical & Service Manual page 7

Fluttery, jumping or erratic reading would indicate:
1. The liquid is vaporizing.
2.
Liquid is coming in to the pump in slugs, possibly an air leak or insufficient liquid
above the end of the suction pipe.
3. Vibration from cavitation, misalignment, or damaged parts.
Pressure Gauge - Discharge Port
High reading would indicate:
1. High viscosity and small diameter and/or lengthy discharge line.
2. The strainer or filter is plugged.
3.
The pressure relief valve is set too high.
4. Valve in the discharge line partially closed.
5. Line partially plugged from build up on inside of pump, solidified product or foreign
object.
6.
Liquid in the pipe not up to temperature.
Low reading would indicate:
1. Pressure relief valve set too low.
2.
Pressure relief valve poppet not seating properly.
3. Pump mounting capscrews into torqued to specifications (GP-04 and GP-05
Series 12-15 ft.-lbs.).
4. Pump assembly bolts not torqued into specifications (GP-07 Series 50-55 ft.- lbs.).
5. The bypass around pump partially open.
6. Pump is damaged or worn.
7.
The pump has too much internal clearance.
Fluttery, jumping or erratic reading would indicate:
1. Cavitation.
2.
Liquid is coming to the pump in slugs.
3. Air leak in the suction line.
4. Vibrating from misalignment or mechanical problems.
SECTION TSM 340 ISSUE H PAGE 7 OF 10