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Many LPG (propane & butane) and agricultural ammonia piping systems do not provide ideal net positive suction head (NPSH) conditions for liquid pumps. As a result the poor NPSH conditions lead to excessive pump maintenance. Since reciprocating compressors are exposed to vapors only, poor NPSH conditions are not a factor. Many LPG and agricultural ammonia pressurized tanks such as tank cars and buried tanks have top unloading connections. A reciprocating compressor is the perfect solution for transferring liquids in this type of application.

Most of Corken's vertical LPG reciprocating compressors have single packed piston rods and none offer oil-free gas compression. The only exception is the model D891 which has two sets of packing (one V-ring and one segmented); however, but it is not oil free. Single packed, non oil-free compressors are typically used in non-corrosive and non-toxic applications where oil-free service and leakage containment are not critical. Typical application include propane, butane, agricultural ammonia, and natural gas.

LPG Reciprocating
Compressors (Non Oil Free)

  • Utilizes one set of V-ring packing per piston rod and 
  • No distance piece between the cylinder and crosshead guide
  • Not oil free
  • Single stage compression
  • Ideal for non-toxic, non-corrosive applications where oil-free gas and leakage containment are not critical
Operating Specifications
Piston displacement: up to 117 cfm (198.8 m3/hr)
Working pressure: up to 450 psi (31 bar g)
Brake horsepower: up to 45 hp (34 kW)
Maximum outlet temperature: 350°F (177°C)

Overview
Single packed compressors are typically used in non-toxic, non-corrosive applications where oil-free gas and leakage containment are not critical. LPG (propane & butane), agricultural ammonia, and natural gas applications are where a single packed compressor fits well.

  • One packing set per piston rod
  • Does not offer oil-free compression
  • Utilizes a V-ring packing design (V-rings, a male and female packing ring, washers, and a spring)
  • Single stage design only (exception: model 891 offer two-stage compression)
  • Four single-acting models (91, 291, 491 & 691) and one double-acting (D891)
  • Cylinder sizes are 3.0", 4.0", and 4.5"
  • Available with NPT or Class 300 RF connections
  • Head and cylinder: Ductile iron
  • Crosshead guide, crankcase, flywheel and bearing carrier: Gray iron
  • Valve seat and bumper: stainless steel or ductile iron
  • Valve plate: PEEK or stainless steel
  • Valve spring: Stainless steel
  • Pistons: Ductile iron, gray iron, stainless steel
  • Piston rings: PTFE (glass and moly filled)
  • V-ring packing: PTFE (glass and moly filled)
  • Packing cartridge: Ductile iron
  • Crankshaft: Ductile iron
  • Connecting rod: Ductile iron
  • Connecting rod bearing: Bimetal Babbitt
  • Wrist pin: Steel
  • Wrist pin bushing: Bronze
  • Main bearing: Tapered roller
  • O-rings: Buna-N, Neoprene® (Registered trademark of the DuPont)
  • All cylinders and heads are made of ductile iron for maximum thermal shock endurance
  • A single packed compressor is a great low cost option for applications where oil-free gas and leakage containment are not critical
  • Valve design offers quiet operation, high efficiency and greater durability
  • The step-cut design of the self-lubricating piston rings provides higher efficiencies during the life of the piston ring
  • Positively locked pistons allows end clearance to be precisely set to provide maximum efficiency and long life
  • Packing sets are a spring loaded seal design that self adjusts to compensate for normal wear
  • Adjustable packing screw ensures maximum sealing capacity throughout the life of the packing (exception: model 891)
  • Cast iron crossheads provide superior resistance to corrosion and galling
  • Pressure-lubricated crankcase with filter keeps the internals well lubricated at all times and minimizes premature wear
  • Agricultural ammonia
  • Butane
  • Natural gas
  • Propane
  • And many more
  • Vapor recovery
  • Liquefied gas transfer
  • Pressure boosting
  • Tank evacuation
  • Rail car loading and unloading
  • And many more