Ammonia (R717) system condensing unit

Technical specification

To increase the capacity of the cooling supply system of shop №5, it is necessary to purchase two screw compressor units. The refrigerant is R717.

Required technical specifications:

1. Compressor unit №1 (Appendix №1) Cooling capacity 1000 kW (Δ=±5%)

• at a boiling point of -10°C; condensation of +35°C;

• oil cooling-thermosiphon;

• ECO port from an existing economizer with a boiling point of 0°C;

• electric motor power up to 355 kW, speed up to 3600 rpm IP55;

• the unit must be equipped with strapping fittings, a power and control cabinet, and a frequency converter.

2. Compressor unit №2 (Appendix №2) Cooling capacity 380 kW (Δ=±5%)

• at boiling point -42°C; condensation -10°C;

• oil cooling-thermosiphon;

• electric motor power up to 110 kW, speed up to 3600 rpm IP55, IE4;

• the unit must be equipped with strapping fittings, a power and control cabinet, and a frequency converter.

Both units must also meet additional requirements in accordance with Appendix №1 and №2.

Requirements for the unit №1 -10/+35

The compressor unit must have factory pipes and frame connections, including the oil separator,

oil cooler, shut-off valves, valves, control panel, auxiliary fasteners, etc., mounted and integrated in the combined base steel frame with painting.

the design of the unit according to the CU TR standards

must be vibration-free, shock absorbers (silencers) maybe required to prevent vibrations, in this case they are included in the delivery package

reinforced frame of the unit

100% non-destructive testing of welds of pressure vessels at

least 10% non-destructive testing of unit pipes

set of operational documentation in Russian

availability of a double safety valve with three-way tap

manufacturer of the screw unit (compressor) - MYCOM

availability of shut-off and control valves that allow disconnecting the unit from the system:

• suction (shut-off valve, filter and check valve)

• discharge (check valve)

• economizer (shut-off valve, filter, electrically operated shut-off valve, pressure sensor, temperature sensor)

• input/output to the thermosiphon oil cooler (shut-off valves)

presence of pressure sensors on the suction and discharge pipelines of the unit, as well as oil pressure (after pump and after filters)

availability of temperature sensors on the suction and discharge lines of the unit, as well as oil temperature (after the oil cooler and in the oil collector)

availability of pressure gauges with shut-off valves for visual monitoring of oil pressure, suction and discharge

availability of separate protective relays for lowering/exceeding pressure, with manual reset for low and high (double) pressure

possibility of working with oil MOBIL GARGOYLE ARCTIC 300

oil circulation and regeneration system available:

• electrically driven oil pump

• oil heater with thermostat

• thermostatic 3-way valve for maintaining the oil temperature

• shell-and-tube thermosiphon oil cooler at Tc=+35°С(with 10% margin)

• oiloilseparator (oil entrainment no more than 15ppm)

• set of pre-commissioning filters with spare gaskets

overall dimensions of the unit (length / width/height, mm): 4300/ 1800/ 2400

Electric motor:

• energy efficiency class of the electric motor (not lower than IE3)

• forced air fan for electric motor

• possibility of working with variable speed and at a frequency of 60 Hz

Control panel:

availability of its own controller that provides all the functions of starting/stopping in offline and remote mode, including safety functions, preliminary emergency notification and control of compressor unit performance

availability of a control panel (screen)

Modbus data transmission capability Modbus

power supply for the controller, screen, control circuits, alarm and security is implemented using a UPS with internal automatic and external service bypass

cable binding of the compressor unit with a control panel on one frame included in the delivery package

Power cabinet with frequency converter:

• compliance with the requirements CU TR 004/2011

• cable entry (and exit) into the cabinet from below

• electricity metering at the cabinet entry

• frequency converter manufacturer – Danfoss or analogues of equal quality

• presence of a higher harmonic filter in the frequency converter

• manufacturer of power and modular automatic switches, contactors -- Siemens / ABB / Schneider / Eaton / Noark or analogues of equal quality

Requirements for the unit №2 -42 / -10

The compressor unit must have factory pipes and frame connections1 , including the oil separator, oil cooler, shut-off valves, valves, control panel, auxiliary fasteners, etc., mounted and integrated in the combined base steel frame with painting.

the design of the unit according to the CU TR standards

must be vibration-free, shock absorbs (silencers) maybe required to prevent vibrations, in this case they are included in the delivery package

100% non-destructive testing of welds of pressure vessels at

least 10% non-destructive testing of unit pipes

set of operational documentation in Russian

availability of a double safety valve with a three-way tap

manufacturer of the screw unit (compressor) - MYCOM

availability of shut-off and control valves that allow disconnecting the unit from the system:

• suction (shut-off valve, filter and non-return valve)

• discharge (non-return valve)

• input / output to the thermosphere oil cooler (shut-off valves)

presence of pressure sensors on the suction and discharge pipelines of the unit, as well as oil pressure (after the pump and after filters)

availability of temperature sensors on the suction and discharge lines of the unit, as well as oil temperature (after the oil cooler and in the oil collector)

availability of pressure gauges with shut-off valves for visual monitoring of oil pressure, suction and discharge

availability of separate protective relays for lowering/exceeding pressure 1 with manual reset for low and high (double) pressure

availability of a circulation and regeneration system electric oil

• pump

• oil heater with thermostat

• thermostatic 3-way valve for maintaining the oil temperature

• shell-and-tube thermosiphon oil cooler at Tc=+35°С(with a 10% margin)

• fine oil separator (oil entrainment no more than 15ppm)