Reliability of borehole pumping units: causes of failure and methods of their elimination

Summary

The most common causes of borehole pump failures and methods for eliminating them both at the stage of pump selection and during operation are considered. A significant number of pump failures are associated with incorrect selection of pumps for operating conditions, in particular, selecting pumps with characteristics that do not meet the system requirements resulting in the pump operating beyond the operating range. Examples of the most common errors in pump selection and their consequences are given. Monitoring the pump operating mode, in particular, monitoring the position of the operating point relative to the operating range provides for identifying the problem. Pump parameters are monitored both by direct methods by measuring the parameters, and indirectly. If the pump operating point is beyond the operating range, taking corrective actions aimed at remediating the situation is required. Following the proposed recommendations will help the staff operating pumping equipment to analyze the causes of borehole pump failures and develop corrective measures.

Key words

reliability , well pump , pump characteristic , pump operating range , pump control

Improving internal fire water supply systems in student dormitories

Summary

The need of conducting an expertise of the internal fire water supply systems in old buildings of student dormitories in accordance with the requirements of paragraphs 55 and 57 of the «Rules of the fire safety arrangements in the Russian Federation» is substantiated. Cases of inefficient use of the internal water supply system in such buildings in the event of a fire are considered. Based on the study of the internal fire water supply system of a dormitory building in order to improve similar systems, the following is proposed: to carry out a test calculation of the operating systems no less than the service life specified in the passport of the manufacturer of the boosting pump; for quick suppression of a possible fire (before the formation of critical parameters of fire hazards) the boosting pumps should be activated not by the remote start buttons but by the automatic fire alarm system with its start duplicating by the start button in the clock at the security desk of the dormitory; for the effective use of internal fire water supply systems with the simultaneous evacuation of students the boxes of fire hydrants should be equipped with filter self-rescuers (at least three).

Key words

student dormitory , fire , required head , pump characteristic , automatic fire alarm , firefighting water line