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SMC 108 S

Refrigeration Compressor (Reciprocating) · Refrigeration

Technical data from manufacturer or class sources · not yet verified by a person​‍‌‌​‌⁠​‍‍⁠⁠‍⁠⁠​⁠​‌​

Sabroe SMC 108 S — Large single-stage reciprocating compressor for heavy-duty industrial refrigeration, marine and offshore; R717, R22, R134a, R404A, R410A, R507.

Specifications

Technical data.

Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.

Reference values — not verified
Airflow (m³/h)452
Speed (1/min)700–1500
Weight (kg)740
Cylinders8
Bore x stroke (mm)100 x 80
Cylinder bore100 mm
Stroke80 mm

Source: cooltech.fi · not checked against a manufacturer datasheet

Inspection

Inspector Detail

Common issues

  • Discharge valve plate wear or breakage causing capacity loss and knocking
  • Oil carryover into the refrigeration system, reducing evaporator/condenser efficiency
  • Liquid slugging damage from flooded starts or poor superheat control
  • Crankcase heater failure leading to refrigerant migration and oil dilution at standstill
  • Capacity control (unloader) mechanism sticking
  • Shaft seal leakage of refrigerant or oil at the crankshaft

Inspection checklist

  • Check discharge valve plates for wear/leakage via capacity and discharge temperature trend
  • Check crankcase oil level, condition, and for refrigerant dilution
  • Compare suction and discharge pressures/temperatures against the expected curve for the refrigerant in use
  • Inspect the shaft seal for leakage
  • Check capacity control/unloader operation at each step
  • Verify safety devices (high pressure cutout, oil differential pressure switch, low pressure cutout) trip at the correct settings
  • Check foundation bolts and vibration levels
  • Check belt/coupling alignment if belt-driven

Service intervals

Oil changetypically every 4,000-8,000 running hours, or per oil analysis recommendation, whichever comes first
Oil filter renewalevery 2,000-4,000 running hours
Valve plate inspection/overhaultypically every 8,000-12,000 running hours depending on duty and refrigerant - confirm against Sabroe's schedule for the SMC 108 S
Safety device (HP/LP cutout, oil pressure) function testevery 6-12 months

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Cylinder bore wear/ovalityassessed against Sabroe's own maximum oversize/rebore limit for this 100 mm bore class - confirm the current limit in the SMC series service manual before deciding to rebore
Piston ring end gaptypically in the order of 0.3-0.6 mm per 100 mm of bore for reciprocating refrigeration compressors of this class - confirm against Sabroe's own tolerance table for the SMC 108 S

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • Discharge/suction valve plate set
  • Cylinder head gasket set
  • Shaft seal
  • Oil filter element
  • Capacity control (unloader) components
  • Safety relief valve, renewed/tested per class interval

Safety

  • Ammonia (R717) systems present a toxic and flammable gas hazard - breathing apparatus and gas detection must be available near the machine
  • Do not work on the pressurized refrigerant circuit without confirming isolation and pump-down
  • Crankcase heater must be energized before start after standstill to avoid liquid slugging
  • Hot surfaces on the discharge line and cylinder heads

Class survey

Refrigeration compressors on cargo or provisions duty are subject to periodic survey of safety devices (HP/LP cutouts, relief valves); for ammonia systems, class pays particular attention to gas detection and emergency shutdown. Overhaul records and relief valve test/renewal status are expected.

Estimated lifetime: major overhaul (valve plates, rings, bearings) typically falls due in the 8,000-15,000 running hour range depending on refrigerant and duty; with proper maintenance the compressor block commonly remains in service 20+ years - confirm against Sabroe's own service schedule

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