『Esko Flow Meter Maintenance: Sealing Water and Lubrication Oil Monitoring Checklists』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
Esko Flow Meter Maintenance: Sealing Water and Lubrication Oil Monitoring Checklists
Quick Answer: Check sealing water pressure daily and keep it 0.2 to 0.5 bar above process pressure. Replace lubrication oil every 2000 running hours or every 6 months, whichever comes first. Use the checklists below to catch seal wear, bearing damage, and flow reading drift before an unplanned stop.
Many Esko flow meter failures start with two small problems. Sealing water drops too low. Lubrication oil becomes dirty or old. A water treatment team in Vietnam ignored low sealing water flow for four days. The meter seal failed and the process line stopped for six hours.
This guide covers the daily, weekly, and monthly checks that field engineers actually use. Silver Automation Instruments supplies flow meters and spare parts for these applications in Southeast Asia, the Middle East, Latin America, Africa, and Oceania.
Why Sealing Water Monitoring Belongs on the Daily Log
Sealing water protects the shaft and bearing area from process fluid contact. On wastewater and slurry lines the process fluid is abrasive. A small drop in sealing water pressure can let solids enter the seal chamber. The damage is not instant. It shows up later as rough rotation, loud operation, or drift in the meter output.
Check the sealing water inlet strainer every day. A blocked strainer drops pressure without tripping any alarm. We have seen strainers filled with silt on sites in the Philippines and Nigeria. The pressure gauge before the strainer reads normal. The gauge after the strainer reads zero. That gap is the warning sign.
Daily Sealing Water Checklist
- Record sealing water inlet pressure at the meter skid
- Confirm sealing water flow between 0.5 and 2 L/min for meter sizes DN25 to DN80
- Compare pressure drop across the strainer and clean it if the drop is above 0.3 bar
- Check for water leaking from the seal drain port
- Verify that the water is clean and free of sand or fibers
Keep the log simple. One line per shift is enough. The key number is the differential pressure across the strainer, not the inlet pressure alone.
Lubrication Oil Checks That Catch Failures Early
Oil condition tells you what is happening inside the bearing housing. Dark oil is not always bad. Milky oil is always a problem because water entered the housing. If the oil level is above the sight glass center line and the oil looks grey, stop the meter and drain the housing. The seal water system has failed somewhere.
Use ISO VG 32 or ISO VG 46 oil for most Esko flow meter bearings. On high ambient temperature sites above 38 °C, ISO VG 46 holds viscosity better. Replace the oil every 2000 running hours or every 6 months. In dusty or humid coastal areas, shorten the interval to 1500 running hours.
Keep a small sample bottle from each oil change. Label it with the date, meter tag, and running hours. If the oil turns dark quickly between two changes, check bearing clearance. Silver Automation Instruments can help with bearing kits and oil specifications if you send the meter tag and operating hours.
Weekly Lubrication Oil Checklist
- Check oil level at the sight glass center line with the meter stopped
- Look for water droplets or foam on the sight glass
- Wipe the filler cap before opening to avoid dust ingress
- Smell the oil for a burnt odor; this can indicate hot bearings
- Record the oil top up volume; if the volume increases week after week, inspect the seal
Monthly and Quarterly Maintenance Tasks
Monthly, remove and clean the sealing water strainer element. Replace the element if the mesh is defo
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Quarterly, check the oil with a simple crackle test. Most engineers skip the crackle test. Do it anyway. Put a drop of oil on a hot plate at 160 °C. If it crackles, water is present. You can also use a portable moisture meter for oil. When water content is above 500 ppm, drain and flush the housing. Then refill with fresh oil and run the meter for one hour before returning to service.
If the meter uses a grease lubricated bearing, do not mix lithium grease with polyurea grease. The wrong mix can harden and block the bearing. Check the nameplate or maintenance manual before greasing.
Common Failure Patterns and How to Spot Them
Sealing water pressure is normal but oil still turns milky. That points to a worn mechanical seal or a cracked seal face. Another pattern is rising bearing temperature with clear oil. That often means oil level is too high or the wrong oil viscosity is in use.
Vibration is the next clue. A healthy meter rotates smoothly. A rough sound during startup after a weekend shutdown often means solids settled in the seal chamber. Circulate clean water at low flow for 10 minutes before starting the process line. This small step prevents many seal failures.
Recommended Meter Types for Dirty and Wet Processes
For slurry, wastewater, and pulp stock, electromagnetic flow meters from Silver Automation Instruments work well because they have no moving parts. For clean oil and fuel batching, oval gear flow meters provide repeatable volume measurement. For compressed air and gas, thermal mass flow meters are a good fit. If you need sealing water monitoring, pair a pressure transmitter with a 4-20 mA HART output and a local display so the operator can see the differential at the skid.
Our team can supply flow meters, pressure transmitters, and paperless recorders for maintenance logs. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. We will recommend a meter and the correct sealing water or oil maintenance schedule.
FAQ
Q: What is the correct sealing water pressure for an Esko flow meter?
Keep sealing water pressure 0.2 to 0.5 bar above the process pressure at the meter inlet. If process pressure is 4 bar, set sealing water at 4.2 to 4.5 bar.
Q: How often should lubrication oil be replaced?
Replace oil every 2000 running hours or every 6 months. In high humidity or dusty zones, use 1500 running hours as the interval.
Q: What oil viscosity is best for Esko flow meter bearings?
ISO VG 32 or ISO VG 46 is common. Use ISO VG 46 when ambient temperature stays above 38 °C.
Q: Why does the lubrication oil turn milky?
Water entered the bearing housing. Inspect the seal, sealing water pressure, and drain port. Replace the oil after fixing the source.
Q: Can Silver Automation Instruments supply spare parts for Esko flow meters?
Yes. We supply sealing water strainers, sight glasses, bearing kits, pressure transmitters, and full meter replacements. Send the meter tag, operating hours, and site location.
Contact Silver Automation Instruments
Send your flow meter tag, operating hours, and site location. We help with sealing water strainers, oil types, and spare parts for Esko flow meter maintenance.
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
View flow meter options at flow-meter.com.au
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