Aastane hooldus

Pump performance should be inspected and documented in detail at least annually. A performance baseline should be established early in submersible vertikaalne turbiinpump operation, when parts are still in current (not worn) condition and have been properly installed and adjusted. This baseline data should include:

1. The head (pressure difference) of the pump measured at suction and discharge pressures under three to five working conditions should be obtained. Zero flow readings are a good reference and should also be included where possible and practical.

2. Pump flow

3. Motor current and voltage corresponding to the above three to five operating conditions points

4. Vibration situation

5. Bearing box temperature

When conducting your annual pump performance evaluation, note any changes in baseline and use these changes to determine the level of maintenance required to return the pump to optimal function.

While preventive and protective maintenance can keep yourvertikaalne sukelturbiinpumpoperating at peak efficiency, there is one factor that must be kept in mind: all pump bearings will eventually fail. Bearing failure is usually caused by lubricating media rather than equipment fatigue. That’s why monitoring bearing lubrication (another form of maintenance) can help maximize bearing life and, in turn, extend the life of your submersible vertical turbine pump.

>When choosing a bearing lubricant, it is important to use a non-foaming, detergent-free oil. The proper oil level is at the midpoint of the bull's eye sight glass on the side of the bearing housing. Over-lubrication must be avoided, as over-lubrication can cause as much damage as under-lubrication. 

Excess lubricant will cause a slight increase in power consumption and generate additional heat, which may cause the lubricant to foam. When checking the condition of your lubricant, cloudiness may indicate an overall water content (usually the result of condensation) greater than 2,000 ppm. If this is the case, the oil needs to be changed immediately.

If the pump is equipped with relubricable bearings, the operator must not mix greases of different properties or consistencies. The guard must be close to the inside of the bearing frame. When relubricating, make sure the bearing fittings are clean as any contamination will shorten the service life of the bearings. Overlubrication must also be avoided as this can lead to localized high temperatures in the bearing races and the development of agglomerates (solids). After regreasing, the bearings may run at slightly higher temperatures for one to two hours.

When replacing one or more parts of a failed pump, the operator should take the opportunity to inspect other parts of the pump for signs of fatigue, excessive wear and cracks. At this point, the worn part should be replaced if it does not meet the following part-specific tolerance standards:

1. Bearing frame and feet - Visually inspect for cracks, roughness, rust or scale. Check machined surfaces for pitting or erosion.

2. Bearing frame - Check the threaded connections for dirt. Clean and clean threads if necessary. Eliminate/remove any loose or foreign objects. Check the lubrication channels to make sure they are clear.

3. Shafts and bushings - Visually inspect for signs of serious wear (such as grooves) or pitting. Check the bearing fit and shaft runout and replace the shaft and bushing if worn or toler- ance is greater than 0.002 inches.

4. Housing - Visually inspect for signs of wear, corrosion or pitting. If the wear depth exceeds 1/8 inch, the housing should be replaced. Check the gasket surface for signs of irregularities.

5. Impeller - Visually inspect the impeller for wear, erosion or corrosion damage. If the blades are worn more than 1/8 inch deep, or if the blades are bent or deformed, the impeller should be replaced.

6. Bearing Frame Adapter - Visually inspect for cracks, warping or corrosion damage and replace if these conditions are present.

7. Bearing housing - Visually inspect for wear, corrosion, cracks or dents. If worn or out of tolerance, replace the bearing housing.

8. Seal Chamber/Gland - Visually inspect for cracks, pitting, erosion or corrosion, paying special attention to any wear, scratches or grooves on the seal chamber surface. If worn more than 1/8 inch deep, it should be replaced.

9. Shaft - Check the shaft for signs of corrosion or wear. Check the straightness of the shaft and note that the maximum total indicator reading (TIR, runout) at the seal sleeve and coupling journal cannot exceed 0.002 inches.

Järeldus

While routine maintenance may seem daunting, the benefits far outweigh the risks of delayed maintenance. Good maintenance keeps your pump running efficiently while extending its life and preventing premature pump failure. Leaving maintenance work unchecked, or putting it off for longer, can lead to costly downtime and costly repairs. Although it requires great attention to detail and multiple steps, having a strong maintenance plan will keep your pump up and running and reduce downtime to a minimum so your pump is always running in good condition.