Sabroe SMC 104/106/108/112/116 Cylinder Liner

Sabroe SMC 104 / 106 / 108 / 112 / 116 Compressor Cylinder Liner

The Sabroe SMC 100 reciprocating series—encompassing the 104, 106, 108, 112, and 116 model variants across Mk1 through Mk5 generations—serves as the workhorse for marine reefer plants, cargo hold refrigeration, provisioning chillers, and industrial freezing plants. Operating under demanding pressures with continuous duty cycles on R717 (Ammonia), R22, and modern low-GWP hydrofluorocarbons/HFO blends, cylinder liners are subjected to severe frictional loads, rapid thermal cycling, and boundary lubrication during start-up.

This cylinder liner assembly is centrifugally cast from dense pearlitic gray flake cast iron with closely monitored lamellar graphite distribution. This metallurgy provides self-lubricating dry-running capabilities during oil-wash situations, exceptional damping capacity against high-frequency piston slap, and wear resistance along the stroke line. Each liner is precision-machined to OEM tolerances and finished with a multi-angle plateau hone to maintain hydrodynamic oil retention without driving up crankcase oil carry-over.

Technical Details:

Key Features

1. Centrifugally Cast Pearlitic Alloy: Formulated with high-strength alloyed cast iron (HB 200–240) to eliminate micro-porosity, preventing refrigerant bypass under 28-bar maximum discharge pressures.
2. Precise Unloader Collar Interfacing: Machined guide collars and port profiles guarantee smooth travel of capacity unloader lifting mechanisms (hydraulic unloader fingers and spring-actuated rings).
3. Direct Interchangeability: 100% geometric dimensional compliance with Sabroe OEM drawing dimensions ensures direct, drop-in fitment into the compressor crankcase upper deck without in-situ machining.
4. Dual-Gas Metallurgy Compatibility: Resistant to chemical degradation, stress cracking, and cavitation when operating with R717 (anhydrous ammonia), synthetic POE/PAG oils, and mineral lubricants.

Part Number Cross-Reference

• OEM Bare Cylinder Liner (S/L): 3112.065 / 3112-065
• OEM Extended Stroke Liner (E-type): 3112.080 / 3112.081
• OEM Low-Pressure Stage Liner (R717): 3112.085
• OEM High-Pressure Stage Liner (R717): 3112.087
• Suction Valve Ring Gasket: 2356.111 / 2353.140
• Cylinder Liner Sealing O-Rings: 1331.085 / 1331.543
• Unloader Capacity Lifting Ring Assembly: 3135.054 / 3135.173

Primary Applications

• Vessel Reefer Cargo Plants: Multi-compressor installations controlling cargo hold temperatures on container vessels, fish processing factories, and fruit carriers.
• Marine Provision Refrigeration: Domestic provision store condensing units on deep-sea commercial vessels, offshore support vessels (OSVs), and drilling rigs.
• Blast Freezing & RSW (Refrigerated Sea Water) Systems: High-load RSW plants on pelagic trawlers, purse seiners, and dockside processing barges.
• Industrial Ammonia Cold Storage: Single- and two-stage distribution cold storage warehouses, dairies, breweries, and meat production facilities.
• CO2 / NH3 Cascade Secondary Systems: Industrial refrigeration stages utilizing low-pressure ammonia loops with TSMC multi-stage compressors.

Frequently Asked Questions

What is the bore diameter for the Sabroe SMC 100 series cylinder liner?

The nominal internal diameter for all Sabroe SMC 100 series reciprocating compressors (including SMC 104, 106, 108, 112, and 116) is exactly 100 mm. Maximum allowable cylinder wear or ovality before reboring or replacement is 0.10 mm.

How do I distinguish between an S-stroke, L-stroke, and E-stroke cylinder liner?

Standard S (Short: 80 mm) and L (Long: 100 mm) strokes utilize interchangeable base liners (OEM part number 3112.065). The E-stroke (Extended: 120 mm) variant features a deeper stroke length and specific cylinder skirt dimensions (OEM part number 3112.080 / 3112.081) to prevent the bottom piston ring from emerging past the lower liner landing. Always verify the stroke suffix stamped on your compressor nameplate before ordering.

Can this cylinder liner be used for both R717 (Ammonia) and Freon systems?

Yes. The pearlitic flake cast iron metallurgy is chemically inert to anhydrous ammonia (R717) and fully compatible with halocarbon refrigerants (R22, R134a, R404A, R507) and polyolester (POE), alkylbenzene, or naphthenic mineral compressor oils. Verify your valve plate seal rings and elastomeric O-rings match the specific refrigerant in charge.

Are these liners supplied with the capacity unloader pin assemblies?

Standard liners are provided as a bare precision sleeve with the suction valve seat finish. Unloader lifting rings, unloader guide pins, tension springs, and suction valve plates can be supplied individually or pre-assembled as a full overhaul drop-in kit upon request.