Category: PUMPX KNOWLEGE

  • Regular Submersible Motor Inspections

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    Daily Inspections (1) Check for excessive vibration and strange sounds.(2) Check working order(3) Check electric current values.Remarks Confirm that there are no sudden changes in current or pressure.Measure and record values regularly. Monthly Inspection (1) Measure insulation resistance.(2) Measure continuity. Check insulation resistance lower limits.Confirm U-V, V-W, W-U thermal protectors continuityConfirm that thermal protector coil…

  • Regular Diesel Engine Inspections

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    Daily Inspection (1) Inspect appearance.(2) Check for vibration and unusual sounds.(3) Check bearing temperature.(4) Check lubricating oil pressure.(5) Check lubricating oil level.(6) Drain air from tank.(7) Check exhaust gas color Monthly Inspection (1) Clean fuel filter.(2) Clean lubricating oil filter.(3) Oil all sliding parts.(4) If the unit has not been in use for an extended…

  • Understanding Pressure Drop in Valves: A Visual Guide

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    PRESSURE DROP/FLOW RATE DIAGRAM – BALL VALVE PRESSURE DROP ΔP DIAGRAM – CHOKE VALVE ( Butterfly valve) PRESSURE DROP ΔP DIAGRAM – FOOT VALVE ( Bottom valve) PRESSURE DROP ΔP DIAGRAM – BRASS CHECK VALVE PRESSURE DROP ΔP DIAGRAM – FLANGED CHECK VALVE IN CAST IRON PRESSURE DROP IN EQUIVALENT LENGTH OF PIPE IN METRES…

  • Effects of Sudden Changes on Pipe Pressure

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    DN = Nominal pipe diameterDi = Effective internal diameter of pipeFor the continuous pressure drop in the cone, consider an equivalent length of pipe of diameter DN1= L PRESSURE DROPS DUE TO SUDDEN ENLARGEMENT IN WATER COLUMN METRES PRESSURE DROPS DUE TO SUDDEN RESTRICTION IN WATER COLUMN METRES PRESSURE DROPS LOCALISED TO DIVERGENT ISO CONES…

  • ISO 9906: How to Select Efficient Pumps

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    The specifications given herein refer to the curves given in our catalogues and Data Books (see www.ebaraeurope.com). All performance curves have been calculated in compliance with ISO 9906 Annex A. Tolerances per ISO 9906 Annex A. The curves refer to the effective speed of the asynchronous motors at 50 Hz. The measurements were run at…

  • Pressure Drop and Fluid Dynamics in Pipes

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    This is the resistance opposed to the flow of the fluid by the walls of a pipe or by variations of diameter of the pipe, or at intersections with bends and valves in the circuit. It is also determined by the fluid temperature and geodetic height of the installation. It is generally expressed in watercolumn…

  • What is Pump Total Head? Key Factors in Fluid Mechanics

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    Determination of the HEAD (H) The head is the maximum total difference in level which a pump can elevate a fluid. The head includes the level difference between the pump and the supply tank, if located at a lower level, and the difference between the pumpand the destination tank at a higher level. The route…

  • Understanding IP Protection Ratings for Electrical Equipment

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    PROTECTION RATING This is identified as IP (Ingress Protection – the degree of protection against the ingress of foreign materials and agents). CEI EN 60529 (protection rating of housings – IP code) establishes the IP rating to indicate the protection of electrical equipment against access to live components and against penetration by water and foreign…

  • Understanding Direct and Star-Delta Motor Starting Techniques

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    Direct start Direct starting is the simplest method of starting and is obtained by connecting the motor’s rated voltage to the stator. In general, this is used for small motors which can run up to speed in short time.Fig. 1 shows the direct starting procedure, obtained by closingconnections “1”. The main disadvantages, as can be…

  • Understanding Fluid Flow Rate (Q) for Efficient Water Supply

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    Determining the FLOW RATE (Q)The quantity of fluid that passes through a section of area “A” in unit time. The first value to calculate when sizing a pressurisation unit is the total quantity of water it must supply to satisfy the maximum theoretical demand, given by the sum of the water demand at each point…

  • PUMP SUCTION HEAD

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    NPSH (Net Positive Suction Head) A pump installed above the water level can suck the water due to theatmospheric pressure on the surface itself, which is equivalent to about 10 m of water column. This means that, however great the suction power of the pump, the height from which it can draw up the fluid…

  • Regular Electric Motor Inspections

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    Frequency Inspection  Items Daily check (1) Inspect exterior Daily check (2) Check for vibration or unusual sounds. Daily check (3) Check bearing temperature. Daily check (4) Check frame temperature. Daily check (5) Remove any dirt or debris from slip rings and brush holder area. Annually check (1) Check bearing grease and lubricating oil levels and…

  • Regular Pump Inspections

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    (1) Inspect pump appearance. (2) Check for vibration or unusual sounds. (3) Check bearing temperature. Confirm that room temperature  is 40°C or less. (4) Check lubricating  oil pressure – for oil bath bearing (5) Check for excessive  generation  of heat in gland. (6) Check for water leakage from gland packing/ mechanical seal (7) Check pressure …