NORWALK Compressors

Establishment in 1864 as the “Iron Works of Norwalk”, Norwalk Compressors has designed, manufactured and serviced its “NORWALK” brand piston type, reciprocating gas compressors until 2023.

Having made many significant contributions to the advancement of compressor technology, including its patent for the world’s first multi-stage compressor in July 1881, NORWALK during its company history continued its commitment to engineering innovation of first-rate products.

Markets served include: Industrial Gas, Petro-Chemical Gas, Process/Specialty Gas, CNG, Hydrogen, Manufacturing, Pharmaceutical, Polysilicon, Nuclear, Aerospace, and Offshore.

In July 2020, NEUMAN & ESSER acquired NORWALK Compressors with all of its manufacturing assets, products, trademarks and the workforce. The integration of all of its manufacturing assets, products, trademarks and the workforce has been completed in February 2023. Customers are now served through NEAC Compressor Service USA, Inc.

NORWALK Reciprocating Compressors

Norwalk Compressors are exclusively piston reciprocating type, with configurations as horizontal or vertical, single or two throw, and single or multistage compression. They were engineered, manufactured, assembled and tested in Stratford, Connecticut, USA.

Packaging and Designs available range from basic bare compressor blocks to complete packaged skids. Packaged systems include pressure vessels, heat exchangers, interconnecting piping, filtration, and analog or PLC based fault detection systems. Drive trains configurations include v-belt, gear reduction, or direct coupled. Drivers may be electric induction motors, diesel, or natural gas engine drives up to 500 HP, designed as constant or variable speed. Materials applied are application specific and in accordance with industry standards, such as ASTM, NEMA, IEC, ISA, API, CENELEC, etc.

Century Series

Designed and built by NORWALK for long term reliability and efficiency, Century Series balance opposed horizontal compressors meet all demands for continuous, heavy duty applications, up to 400 hp (300 kW).

Slimline Series

Slow and conservative rotating speeds are the basis of every Slimline Series compressor, keeping service continuity and minimum maintenance in mind. Single and multistage, single throw, horizontal configurations available to compress gases up to 25,000 psig (1720 Barg) for oil-lubricated configurations and 5,000 psig (345 Barg) for non-lubricated, up to 350 hp (260 kw). The Slimline compressor is balanced-opposed and water cooled, and available in both electric motor and engine drive configurations.

Charger Series

As NORWALK’s only vertical configuration, every Charger Series compressor is designed with maximum productivity in intermittent to continuous duty applications up to 40 hp (30 kW). Charger series compressors offer a compact, vertical design, water cooled unit designed specifically for small and medium sized natural gas fueling stations.

NORWALK Acetylene Compressors

Conservatively designed, silent in operation, and well known for their exceptionally reliable performance, Norwalk acetylene compressors are slow speed, water cooled, reciprocating piston compressors suitable for continuous service.

Three Standard Size Compressor capacities are available as 7800 SCFH (210 NCMH), 3200 SCFH (85 NCMH), and 1800 SCFH (48 NCMH):

Slimline Series: TR-S3T / 12x10 / 7800 SCFH / 210 NCMH

“12 x 10” Maximum capacity 7800 SCFH @ 8 PSIG

COMPRESSOR PARAMETERS:

Rated suction pressure: 8 PSIG
Allowable suction pressures: 0 – 8 PSIG
Rated suction temperature: 60 DEG F
Rated discharge pressure: 400 PSIG
Rated delivery capacity: 130 SCFM
Brake Horsepower: 42.4 HP
Recommended Motor Horsepower: 50 HP
Maximum Compressor speed: 125 RPM
Minimum Compressor speed: 80 RPM
Recommended Motor speed: 900 RPM
Piston stroke length: 10 inches
Piston Rated Speed: 208 FPM

Slimline Series: TR-S3T / 9x8 / 3200 SCFH / 85 NCMH

“9 x 8” Maximum capacity 3200 SCFH @ 8 PSIG

COMPRESSOR PARAMETERS:

Rated suction pressure: 8 PSIG
Allowable suction pressures: 0 – 8 PSIG
Rated suction temperature: 60 DEG F
Rated discharge pressure: 400 PSIG
Rated delivery capacity: 53 SCFM
Brake Horsepower: 20 HP
Recommended Motor Horsepower: 25 HP
Maximum Compressor speed: 125 RPM
Minimum Compressor speed: 80 RPM
Recommended Motor speed: 900 RPM
Piston stroke length: 8 inches
Piston Rated Speed: FPM 166

Charger Series: NQ-SH3 / 5-1/2 x 4 / 1800 SCFH / 48 NCMH

“5-1/2 x 4” Maximum capacity 1800 SCFH @ 8 PSIG

COMPRESSOR PARAMETERS:

Rated suction pressure: 8 PSIG
Allowable suction pressures: 0 – 8 PSIG
Rated suction temperature: 60 DEG F
Rated discharge pressure: 400 PSIG
Rated delivery capacity: 30 SCFM
Brake Horsepower: 12 HP
Recommended Motor Horsepower: 15 HP
Maximum Compressor speed: 260 RPM
Minimum Compressor speed.: 180 RPM
Recommended Motor speed: 1200 RPM
Piston stroke length: 4 inches
Piston Rated Speed: 173 FPM

NORWALK CNG Compressors

NORWALK has three basic configurations for natural gas fueling stations:

Quick Fill: Similar to using a regular gas pump, the CNG (Compressed Natural Gas) compressor fills a cascade and gas is transferred to a vehicle via dispenser.

Time Fill: During refilling a fleet of vehicles at a central location simultaneously a compressor fills all the vehicles via hose pole. Time fill hose assembles come in single, dual or 4 hose versions and are normally not metered.

Combination: As its name implies, this system blends both quick and time fill layouts. The appropriate fueling method is determined by fleet and customer needs. While facility size and design may vary, the same basic features are usually incorporated into each layout.

Other Components of Natural Gas Fueling Station

Storage cascades are used to store gas at a higher pressure. Cascades are available as either DOT bottles or ASME vessels, depending upon what storage capacity is needed. Cascades can also be connected together to increase storage.

The priority/emergency shutdown (ESD) panel redirects gas from the compressor to the appropriate fueling “station” and isolates storage cascades should an emergency occur.

Gas dryers are used to remove water vapor from the gas to meet local “dew point” conditions.