Skip to content

Ajax Integral Engine-Compressors

OVERVIEW

AJAX Engines, the Clear Choice for Your Compression Needs.

Robust, reliable AJAX engines have been manufactured in the United States longer than any other brand of compression engines. Continuous innovations and technologies add compliance, strength, and simplicity to the original design. AJAX integrals with ratings of 148 – 845 bhp (110 – 650 kWb) feature a slow-speed, two-cycle engine design that results in less wear and fewer moving parts and offers greater reliability and efficiency than high-speed separable units. As a result, operating costs are substantially lower over the life of your equipment. The AJAX integral engine-compressors are the economic choice for a variety of applications, including gas gathering, injection, processing, transmission, and fuel gas boosting.

50 years of reliable, efficient, long-lasting service

The Ajax Competitive Advantage

After nearly 50 years of reliable, efficient, long-lasting service, AJAX integral engine-compressors continue to earn their distinguished reputation for being as close to worry-free as any compressor product in the world. The AJAX product line, from 147 to 845 horsepower (110 to 630 kW), and a cylinder line-up capable of handling a wide range of pressures, from vacuum to 5,500 psi (379 bar), offers up to six ratios of capability and the lowest brake horsepower per million flows for a wider range of applications, including sour gas. Thanks to its unique two-stroke design, the AJAX integral engine-compressor virtually eliminates problems typically caused by the presence of sour gas, handling H2S content up to 3.0 mol%.

Ajax Applications

AJAX integral engine-compressors are available from 147 to 845 hp (110 to 630 kW) and are ideally suited for:

  • Gas gathering
  • Gas transmission
  • Storage
  • Gas re-injection
  • Gas processing
  • Propane processing
  • Helium processing
  • Coal Bed Methane processing

Frame Ratings

Integral Engine-Compressor

 DPC-2201DPC-2202DPC-2801DPC-2802DPC-2803DPC-2804
ModelSTDLESTDLESTDLESTDLESTDLESTDLE
Powera bhp
(kWb)
148
110
148
110
296
221
296
221
192
143
192
143
422
315
384
286
634
473
600
447
845
630
800
597
BSFC Btu/bhp-hr8,0007,8008,0007,8008,2007,8008,2007,8008,0007,8008,0007,800
NOx g/bhp-hr10.00.5-2.0b10.00.5-2.0b5.50.5-2.0b5.50.5-2.0b12.00.5-2.0b12.00.5-2.0b
Maximum Speed rpm440440440440440440
Minimum Speed rpm300300300300300300
Number of Power Cylinders121234
Number of Compression Throws 121223
Rod Load lbs/kN 30,000 / 13333,000 / 14730,000 / 14733,000 / 14740,000 / 17840,000 / 178
Rod Diameter in/mm2.5 / 63.52.5 / 63.52.5 / 63.52.5 / 63.52.5 / 63.52.5 / 63.5
Stroke in/mm11 / 27911 / 27911 / 27911 / 27911 / 27911 / 279

Notes:
a Rating @100°F ambient and 1,500ft FASL
b Rated for 2.0 g/bhp-hr NOx but can achieve 0.5 g/bhp-hr NOx
c Rated for 0.5 g/bhp-hr NOx

Separable Compressor

C-302
Number of throws2
Frame power (hp)
(kW)
300
223
Stroke (in/mm)11 / 279
Max RPM455
Gas rod load lbf/kN
Tension30,000 / 133
Compression 30,000 / 133
Main bearing diameter (in/mm)7 / 178
Piston rod diameter (in/mm)2.5 / 63.5
Crankshaft materialForged Steel
Connecting rod materialForged Steel
Frame weight (lbs)
(kg)
18,000
8,165