Oxygen Nitrogen Plants

Safe and economical, the SANGHI Oxygen Plant, with an efficient expansion engine, lowers operating pressures to a remarkable 30 kg/cm2 , cuts power consumption and adds to safety.

Sanghi Plants are supplied with very efficient reciprocating four-stage air compressor, which consumes low power. Sanghi Plants are supplied with a specially designed highly efficient cascade cooler, which eliminates the need for chilling unit and saves on recurring maintenance and power cost.

A Molecular sieve Battery drier unit for separation of moisture and carbon dioxide is another money saving device in the SANGHI plant. It removes acetylene and other hydrocarbons from the process air, thus eliminating the need for separate acetylene absorbers, and moreover it eliminates recurring caustic soda costs.

Capable of simultaneously producing oxygen and High purity nitrogen, the SANGHI plant has an internal compression liquid oxygen pump to fill dry gaseous oxygen in cylinders. The plant can also be fitted with a separate liquid Nitrogen pump to fill dry Nitrogen directly into cylinders. Plants to produce liquid Oxygen/ Nitrogen can also be offered. We also undertake supervision of Installation and Commissioning of the plant.

Salient features of Oxygen / Nitrogen plants
  • Leak-proof Argon welded Column
  • Skid Mounted Version available
  • Oversize Molecular Sieve Dryer
  • Quick start for fast cooling
  • Very simple to operate
  • No raw material is required.
  • Trouble free operation for years
  • Easy availability of spare parts
  • Low power consumption. Less than 1 unit per cu.m of gas.
  • Production of oxygen & nitrogen simultaneously using separate liquid pumps (no bulky gas holder, no oxygen compressor)
  • Latest molecular sieve technology without recurring cost of chemicals
  • Very compact & sturdy.
  • Low working pressure
  • Option for Liquid Nitrogen withdrawal facility
  • Option for Liquid Oxygen withdrawal facility
  • Option for PPM grade nitrogen i.e., less than 10 PPM
  • Very low maintenance
  • Raw material – Free Atmospheric Air for producing oxygen / Nitrogen gas / liquid
  • Hydraulic type Expansion Engine for Oxygen / Nitrogen Plant with bursting disc and solenoid valve for safe operation
  • Highly efficient Heat-Exchanger for recovery of waste cold energy to reduce operating cost.
  • The oxygen gas plant is supplied complete as per standard scope of supply.
  • Special bypass valve is provided for quick production and better cooling.
  • Foolproof digital temperature indicating system
  • Option for filling of Oxygen as well as Nitrogen in Single Pump
  • Option for separate Nitrogen & Oxygen Pumps.

Plant Specifications

Production Capacity – The plant is very versatile and can be set to produce varying combinations of Oxygen & Nitrogen in gaseous and liquid form.

Plant Model
Get Quantity

Oxygen / Nitrogen

Gas Purity Product Pr.
80 cu.m./Hr
150/220 Kgs/cm2
110 cu.m./Hr
150/220 Kgs/cm2
150 cu.m./Hr
150/220 Kgs/cm2
170 cu.m./Hr
150/220 Kgs/cm2
200 cu.m./Hr
150/220 Kgs/cm2
250 cu.m./Hr
150/220 Kgs/cm2
300 cu.m./Hr
150/220 Kgs/cm2
400 cu.m./Hr
150/220 Kgs/cm2
500 cu.m./Hr
150/220 Kgs/cm2
600 cu.m./Hr
150/220 Kgs/cm2
800 cu.m./Hr
150/220 Kgs/cm2
1000 cu.m./Hr
150/220 Kgs/cm2
Process Description of SANGHI Oxygen Plant

The free atmospheric air is sucked in by a multi-stage air compressor through a filter and compressed to the working pressure. After each stage, intermediate coolers and water separators are provided. The compressed air then passes through the cascade cooler and then to the molecular sieve battery where the moisture and carbon dioxide are removed from the process air. It then passes through the exchanger No. 1 where it is cooled by the out-going waste nitrogen and product oxygen. A part of this cold air then flows through an expansion machine and the balance through the 2nd heat exchanger. An expansion valve, R1 Both these streams of air then unite in the lower pressure column where it partially liquefies, controls the ratio of the two air streams. The liquid air (rich air) then passes through the expansion valve R2 to the upper column, which is at a lower pressure than the lower column. Similarly the liquid nitrogen (poor liquid) travels from the lower column to the upper column through an expansion valve R3 where the separation of oxygen and nitrogen occurs. Nitrogen being more volatile passes out as a gas from the top of the column and this waste nitrogen flows through both the heat exchangers cooling the in-coming air. Similarly product oxygen is also passed through the two heat exchangers to cool the in-coming air and then to the filling manifold via a liquid pump. If a small amount of air is vented out from the upper column, higher purity nitrogen can also be obtained from this plant. R4 Valve is provided in order to fasten cooling during start-up.

  • Expansion Engine

    Expansion Engine is a vertical reciprocating machine which can expand air adiabatically from operating air pressure to 5 Kgm / cm2 to produce the required cold for the Oxygen / Nitrogen plant. It greatly helps to reduce power consumption.

  • Oxygen / Nitrogen Liquid Pump

    The liquid pump is a horizontal reciprocating pump. It can pump cryogenic liquids such as Liquid Oxygen, Nitrogen and Argon upto 165 Kgm/Cm2 pressure normally and 250 Kgm / Cm2 pressure in special cases. The pumps are simple and requires least maintenance.

  • Air Seperation Unit / Cold Box

    Air Seperation Unit / Cold Box consists of Distillation Column with Heat Exchangers for heat transfer between the incoming air and the out going cold Nitrogen and Oxygen. It is equipped with Expansion valves for controlling the operation of the plant. Control panel for the cold box is provided with the plant. Defrost heater for thawing plant is also provided on the cold box. It is also equipped with liquid oxygen pump which is a single cylinder equipment and delivers Bone-dry Oxygen upto pressure 165 Kg/Cm2. Cold box is insulated withperlite for minimizing cold losses and reducing power consumption.

  • Sanghi Water Softner Plant

    Custom built water softner plants with flow Capacities ranging from 0.7m3 / Hr to 12m3 / hr with an output per regneration ranging from 8.1m3 to 20.3m3 max. working pressure 3.0 kg / cm2.

  • Sanghi Valves for cylinders

    Oxygen / Nitrogen / Acetylene / Argon Cylinder valves with SS304 spindle & Teflon. This cylinder valve is fixed to a gas cylinder by screwing & its essential functions are as under :

    – To enable filling of gas into the cylinder.
    – To ensure proper storage of the gas – inside the gas cylinder.
    – To release the gas as and when – required.
    – To act as a safety device for the cylinder if valves are provided with safety.

  • Sanghi-Cooling Tower

    Induced draft Rotary sprinklers in FRP casings with electric motor 3 HP / 960 RPM with or without basin in different capacities from 500 LPM to 1000 LPM.

  • Vaporizers

    High Pressure Atmospheric Vaporizer for LOX/LIN Design.
    Construction of Tubes : SS/Copper
    Construction of Frame : Aluminium/Steel

    Operating Pressure & Design Pressure will vary depending upon the users requirement. However, the Vaporizers from operating pressure of 8 Kg/cm2g to 300 Kg/cm2g are available.

    The Vaporizers are used for converting the liquid form of product (i.e. O2,N2,Argon) to the gaseous form. This transformed gas can be supplied in pipe line through Low Pressure Vaporizer or can be filled in cylinders through High Pressure Vaporizers

  • Analysers

    We offer online, digital, electronic analyzers with mounting & portable type for monitoring purities of Oxygen, Nitrogen, Argon and other gases. This indicator is a convenient and handy instrument for field applications where a quick, easy and accurate measurement of oxygen is required. The sensor being located within the instrument requires the gas sample to be delivered to inlet port.

    This instrument is ideal where the sample is available at a slight positive pressure.

  • Foot Mounted Air Compressor

    Air Compressor – Type – Reciprocating, Horizontal, Balance opposed, water jacketed, 3 / 4 / 5 stages, depending upon operation cycle. The air compressor is complete with interstage coolers, separators, motor and starter.

  • Gas Compressors

    This is a reciprocating machine, with crank gear, piston rod, piston, cylinders. The machine is used for building up pressure of Oxygen, Nitrogen, Nitrous Oxide gas for filling the gas into Cylinders. These are available in various capacities and consist of following : Control Panel consisting of Pressure Gauge for All the Stages and Oil Pressure, and manual unloading Valves, Gas Coolers after all the three stages, Safety Valves for all the three stages, N.R.V. at Delivery, Belt Guard, Tool Box, Flywheel, Fiber Buckets for all the three stages, Motor Pulley.