Compressors
The compressor is made according to the requirements of the relevant international standards. The engineering department carefully selects all the materials that were used in the production of all components. The equipment is a ready-to-use unit with all the technological parts necessary for the process of natural gas compression (cooling system, controlling system, automation, lubrication, strapping, fittings, safety system and so on).
All equipment is tested for compliance with operating parameters and configuration, run-test directly at the factory before shipping to the customer. Provide protocols for checking the assembly, test ran, functionality, vibration control equipment. For more than 40 years, the production and improvement of the design of compressor equipment, the exploitation of equipment on the CNG own network in Argentina and Brazil have made it possible to simplify the design and place the technological units on the compressor frame in order to ensure that their maintenance, dismantling and installation are simple, taking minimal time and effort. There is no need for a specialized tool, except for the key for valves, is included in the spare parts inventory, all the rest are standard widely used tools and keys.
The dimensions of the equipment frame are smaller than similar equipment from other manufacturers, for convenient transportation by different means. Air cooling with a fan built into the compressor. Zero costs for servicing the air system against other systems.
Cooling radiators
A wide range of models will allow customer to select the appropriate model for the required range of inlet pressure and capacity. The design technology of the compressor allows to minimize the power consumption for compressing 1 m3 of gas, among the lowest compare to analogues. Energy-saving materials and electrical equipment with the appropriate explosion-proof class are used. The package includes protective flexible hoses for cable wiring.
Compliance with the safety level of Class 1, Division 1, Group D according to the American system NEC 500. The main motor and fan motor are explosion-proof, all connections are made from explosion-proof rigid or flexible explosion-proof pipes with seals in accordance with relevant safety standards. All insecure junction boxes are explosion-proof, all sensors are intrinsically safe or operate through the barriers of sparks of protection.
Automation and control
The system of automation, adjustment of operation, control and management of equipment is localized on the control panel. A user-friendly interface allows you to see both the operating parameters and the archive of alarms. The state of the inlet and discharge valves is shown. The configuration with the Modbus TCP option allows you to report the operating parameters of the equipment using open communication protocols.
The automatic control system for starting and stopping the equipment is based on the gas pressure at the compressor or storage, the pressure sensor, which allows you to configure and synchronize simultaneous or sequential automatic start of several compressors in one CNG station. For example, starting the first compressor with gas pressure in the supply system at the gas compressor station is 23 MPa, and if the capacity of the 1st compressor does not hawk for refueling, the gas pressure in the supply system will continue to fall, the second compressor will start automatically at a gas pressure of 22 MPa. Similarly, the threshold stop values of both compressors are set, until the pressure reaches 24.6 MPa.
Automatic discharge of pressure from all stages at each compressor stop, the gas pressure is equalized on all stages to the value of the inlet, the gas goes to the blown down tank without venting or gas pipeline. Run without load in recirculation mode.
On the compressor frame there is a panel of instruments for monitoring the gas pressure temperature at the inlet, outlet and at stages. As well as equipment, sensors are installed to monitor the operation of the oil system, vibration, output and output parameters of the gas. There are options for connecting gassing and flame sensors.
The electric drive of the compressor is started through a soft start system, which minimizes the requirements for starting currents. The equipment protection system also includes monitoring the number of starts and stops of the compressor per hour. If the customers did not provide or installed a small volume of the Gas Battery Unit: for models with a capacity of 500 m3 / h, a minimum of 2000 liters, and for models with a capacity above 500 m3 / h to 1200 m3 / h, 3.000 liters.
Drainage
The system of interstage condensers drain liquids knock down tank for venting and subsequent draining. At the gas outlet from the cooling system of the last stage, the condenser is equipped with a coalescent filter, with an oil filtration level of <5 ppm for a higher quality of CNG.
Operating temperature
The system for monitoring the operating temperature range of oil in the crankcase:
For normal start-up of equipment at low temperatures, from minus 40 0С, there is a system for keeping operating temperature of the oil, during idle time, with the maximum temperature limit of the heating body being limited to avoid burning oil. In order to maintain the working temperature range of the oil in the crankcase, during the operation of the compressor, there is a system for pumping oil cooling, which proved to be effective at an air temperature of “plus” 40 ° C and above.
Lubrication system
A separate circuit of the compressor lubrication system allows to increase the service life before overhaul for more than 40,000 operating hours and a total service life of at least 20 years. The system consists of a separate oil tank, pump, pressure control devices, level and intensity of lubrication with an oil consumption of up to 50 g per hour of operation. The requirements for the quality of the gas at the inlet are not too high: the dew point of the gas entering the compressor must always be at least 5ºC lower than the air temperature and the filter with a purification degree of not more than 4 microns.
Vibration conditions
The compressor itself is balanced with the horizontally opposed arrangement of the cylinders to minimize the vibration of the equipment, well below the permissible values of the standards of this type of equipment, ISO 10816-6, 1995-12-15, “Mechanical vibration – vibration assessment of a machine based on non-rotating parts” part 6, “Reciprocating machines with power above 100 kW.” The compressor frame is mounted on the vibration support, without the need to attach them to the foundation, as well as the flexible hoses (vibro-compensators) at the inlet, outlet and ventilation are supplied together by the equipment. And also the sound power levels do not exceed 75 dBa at a distance of one meter of the frame of the compressor equipment.
All moving parts of equipment are fenced, warning signs and inscriptions are placed.