Introduction
Flygt 3153.181 seal replacement and service can be done safely and consistently by following this field-ready SOP: lockout/tagout, inspection, disassembly, installing the new mechanical seal, refilling the oil chamber, and commissioning with measured checks.
Nameplate & Operating Context
- Model: Flygt 3153.181 (submersible sewage pump)
- Manufacturer: Xylem (Shenyang)
- Typical nameplate values (per your photo): 50 Hz, 13.5 kW, 1455 rpm, IP68, IEC 60034-1; max liquid temperature 40 °C.
Safety & Preparation for Flygt 3153.181 Seal Replacement
Before Flygt 3153.181 seal replacement, verify LOTO and handling steps to control risk.
Lockout/Tagout (LOTO) & Handling
First,Isolate power and apply LOTO; verify zero energy.
Next,Close valves as applicable; lower liquid level to prevent backflow.
Then,Lift vertically on the guide rails using rated rigging; secure on a service stand.
Finally,Photo-log cable terminations; megger/hipot before opening the terminal box.
Tools & Consumables
- Torque wrench set (M6–M16 range), caliper, feeler gauge.
- Solvent and lint-free wipes.
- New mechanical seal set (as in your second photo) + all O-rings/gaskets.
- Seal chamber oil (OEM grade/equivalent) + new drain plug gasket.
- Fine emery (≥1200#) for minor burrs on the sleeve—never on seal faces.
Typical Symptoms & First Checks
First,Plan Flygt 3153.181 seal replacement only after initial checks confirm a sealing issue.
- Amps/power up, flow down: likely impeller clogging or hydraulic wear.
- Moisture/Leakage probe alarm: suspect mechanical seal or cable entry; sample oil for water.
- High bearing temperature/vibration: bearing wear, misalignment, imbalance, or hydraulic pulsation.
- Frequent trips: insulation drop, water ingress in terminal box, damaged cable, or severe clogging.
Disassembly Sequence for Flygt 3153.181 Mechanical Seal
Before Flygt 3153.181 seal replacement, drain and sample the oil chamber to check for emulsified oil (milky appearance).
1) Motor side – open terminal box; check desiccant and any water marks; record insulation values.
2) Oil chamber – clean around plug → drain slowly, collect 100–150 mL sample; milky/oily-water implies seal failure.
3) Hydraulics – remove guard; lock rotor; remove impeller nut and shims; record shim count/thickness.
4) Seal removal – release circlip/retainer evenly; do not pry on faces. For scaled sleeves, apply penetrant and pull straight off.
5) Clean & renew elastomers – replace all O-rings/gaskets; wipe bore and seat clean and dry.
Installing the New Flygt 3153.181 Seal
This section describes installing and verifying the new seal to complete the Flygt 3153.181 seal replacement.
Incoming QC
- Verify materials (e.g., SiC/Carbon or SiC/SiC), springs/wave springs intact, faces unscratched.
- Wipe faces only with lint-free cloth + anhydrous alcohol; do not fingerprint faces.
Installation Essentials
First,Lubricate & seat O-rings and bore with compatible lube (or small amount of chamber oil); insert vertically, avoid cocking.
Next,Retain & tighten with circlip/retainer; tighten in stages to final torque.
Then,Axial setting/preload – after impeller and shims are back, hand-rotate; verify smooth feel. Check spring compression/preload per manual.
Finally,Fill oil chamber to spec; renew drain plug gasket.
Torque values: use the official table for this model (IEC 60034-1 motor standard reference: https://webstore.iec.ch/publication/261). If unavailable, calculate by bolt grade/lube and choose the conservative (lower) side; re-check after a short soak.
Reassembly & System Checks
- Renew cable entry seals; crimp terminals; repeat insulation (phase-phase/phase-ground) and hipot.
- Clean guide-coupling faces; verify O-ring condition; test a dry “dip-couple” before lowering.
- Rotation check: jog run; confirm arrow direction (for VFDs, test at low frequency).
- Verify leakage probe/alarm circuits and trip thresholds.
Commissioning After Flygt 3153.181 Seal Replacement
This completes the Flygt 3153.181 seal replacement setup prior to reassembly and commissioning.
First,No-load bump (< 10 s) – listen for abnormal noise.
Next,Wet run – ramp to duty point; record amps, power, flow/head, and seal oil temp trend.
then,Early monitoring (24–72 h) – watch probe alarms, current stability, bearing temperature/vibration.
Finally,Follow-up – re-megger at day 7; check oil level if indicated.
(Brand background and product family: https://www.xylem.com/en-us/brands/flygt/)
(Vibration evaluation reference ISO 20816: https://www.iso.org/standard/72343.html)
Quick Troubleshooting
- Leak alarm after new seal → check drain plug, cable entry, terminal box gasket; meter the probe loop.
- Hard starting/high amps → impeller clog, bearing seizure, wrong phase rotation, bad joint.
- Loud running → casing contact, loose impeller nut, wrong shim height.
- Frequent clogging (fibrous media) → scheduled high-speed purge cycles; improve inlet calming/screens; match Dmax to smallest pipe bottleneck.
Maintenance Intervals & Spares
Seal oil sampling every 6–12 months; if emulsified → replace seal ASAP.
Bearing service per hours/starts log.
Consumables each service: O-rings, drain-plug gasket; keep spare impeller nut and circlip.
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