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.

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. 

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.

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.

SKID MOUNTED AIR COMPRESSOR

SKID MOUNTED compressor can be offered on request.

This is a battery of two vessels filled with Molecular Sieve type 13-X to absorb Carbon Dioxide and Moisture from process air. One vessel will be online and the other will be regenerated by Dry Nitrogen. Regeneration Heater is also provided.

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.

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.

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

Salient features of Oxygen/Nitrogen plants

w Leak Proof argon welded column
w  Column available in Copper/Stainless Steel
w  Very compact & sturdy oxygen and nitrogen plants
w Low working pressure Oxygen gas plants
w Very low maintenance for producing oxygen gas
w Raw material -Free Atmosphere Air for producing oxygen/nitrogen gas/liquid
w Latest molecular Sieve absorption of Zeochem, Switzerland.
w  Built in Liquid Oxygen / Nitrogen pump with internal gas vaporizer for filling of bone dry and
     high purity Oxygen/Nitrogen gas in cylinders.                        
w Hydraulic type Expansion Engine for Oxygen/Nitrogen plants
w Highly efficient Heat-exchanger for recovery of waste cold energy to reduce operating cost.
w  The oxygen plant is supplied complete as per standard scope of supply.

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 3.0kg / cm2.

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.

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

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

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.

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.

LGC's are small liquid cylinders with in built pressure building & evaporating coil to allow both gas as well as liquid withdrawal. It can be transported to & from customers site with liquid filled in just like high pressure gas cylinder. This facilitates larger quantity of product transfer in liquid form than in Gaseous form. It is ideal for Liquid N2, Oxygen, Argon CO2 & N2O.

We offer gas cylinders for various gases - Oxygen, Nitrogen, Argon, Carbon Di-Oxide, Hydrogen, Helium etc. with working pressure from 150 bar to 250 bar.