Table of Contents

SF6 Gas Recovery Unit Overview

The SF6 Gas Recovery Unit is professional and integrated equipment specially developed for maintenance of SF6 high‑voltage electrical equipment such as GIS, circuit breakers and switchgears. It integrates functions of gas recovery, filtration, purification, compression, storage and refilling in one unit.

The device effectively recycles waste and residual SF6 gas during equipment overhaul, removes moisture, impurities and decomposed substances through multi-stage filtration and purification, and restores the gas to reusable standard. It realizes cyclic utilization of expensive SF6 gas, greatly reduces gas waste and environmental emissions, and ensures safe, efficient and economical operation of power substation equipment.

Product Features

Sulfur hexafluoride (SF₆) is an insulating gas featuring non-toxicity, non-flammability and superior insulating performance. Its dielectric strength is far higher than that of conventional insulating gases, coupled with excellent arc-extinguishing capability, which makes it widely adopted in SF₆ electrical equipment. Nevertheless, SF₆ gas is costly, and toxic byproducts will be generated via its decomposition under the effects of electric arcs, electric sparks and corona discharge. For this reason, SF₆ gas must be recovered during the operation of SF₆ electrical apparatuses. This dedicated device is specially designed for the recovery and refilling of SF₆ gas during the manufacturing and maintenance processes of SF₆ electrical equipment.

Main Component Performance Parameters

No.	Parameter Name & Unit	Unit
1	Power Supply AC	V	380V (3-phase 5-wire, automatic phase sequence switching)
2	Rated Maximum Gas Storage Pressure (20℃)	MPa	≤4
3	Ultimate Vacuum Degree	Pa	≤10
4	System Vacuum Holding Performance	Pa	When maintained at 133 Pa for 24h, vacuum rise ＜ 400 Pa
5	Compressor Pumping Speed	m³/h	12
6	Vacuum Pump Pumping Rate	m³/h	60
7	Allowable Inlet Initial Pressure of Recovery Unit (20℃)	MPa	0~1.0
8	Final Recovery Pressure for Electrical Equipment (20℃)	MPa	≤53 kPa
9	Residual Oil Content of Recovered Gas	μg/g	Domestic oil content ＜ 10
10	Annual Air Leakage Rate of Unit	%	＜ 1
11	Continuous Trouble-Free Operating Time	h	≥1000
12	Cumulative Trouble-Free Operating Time	h	≥5000
13	Noise Level	dB(A)	Whole machine ≤75
14	Theoretical Liquid Storage Capacity	KG	50
15	Refrigeration Liquefaction Compressor	—	Dongbei Brand
16	Storage Tank Volume	L	50
17	Moisture Content of Recovered Gas (PPM/V)	PPM/V	60
18	Oil Content of Recovered Gas (PPM/V)	PPM/V	10
19	Drying & Filtration Mode	—	Vacuum heating regeneration
20	Initial Charging Pressure	Pa	≤133
21	Final Charging Pressure	MPa	0.8
22	Gas Charging Rate	m³/h	≥5
23	Vaporization Mode	—	Electric heating with automatic temperature control
24	Overall Structure	—	Hand-push mobile trolley type
25	Cooling Method	—	Air cooling

Brief Parameter Summary Table

Item	Specification
Model	HF-WC-627
Vacuum Pump Displacement (m³/h)	60
Ultimate Vacuum Degree (Pa)	10
Vacuum Pump Type	Domestic dual-stage rotary vane vacuum pump
SF6 Recovery Compressor Displacement (m³/h)	12
Working Pressure (MPa)	2.5
Filter Filtration Particle Size (μm)	0.02
Oil Removal Efficiency (PPM)	High-efficiency
Acid Content (PPM)	0.1
Hydrolyzable Fluoride Content (PPM)	0.2
Biological Toxicity	Non-toxic
Moisture Content (PPM)	≤60
SF6 Gas Purity	≥99.9%
SF6 Storage Tank Capacity	50 L
SF6 Storage Tank Material	Carbon Steel
Refrigeration System	High-efficiency premium compressor
Vacuum Gauge	Digital display
Valves	Proprietary technology with built-in butterfly sealing structure, zero air leakage after frequent opening & closing

Main Technical Parameters

No.	Category	Parameter Description	Specification
1	Gas Recovery	Allowable initial recovery pressure	≤0.8 MPa
2	Gas Recovery	Final recovery pressure	≤53 kPa
3	Gas Recovery	Recovery Time	For 1 m³ SF6 gas with initial pressure 0.8 MPa, time taken to recover down to 53 kPa shall be less than 2.5 hours
4	Gas Charging	Charging Time	For 1 m³ SF6 gas space at initial pressure 133 Pa, charging up to 0.8 MPa takes less than 0.8 hours
5	Vacuum Pumping	Ultimate vacuum of the unit	≤10 Pa
6	Vacuum Pumping	Pump-down Time	Time required to evacuate 1 m³ space from initial pressure 0.1 MPa down to 133 Pa is less than 1.0 hour
7	Gas Storage	Volume of storage vessel	0.051 m³
8	Gas Storage	Nominal liquid SF6 storage capacity	50 kg
9	Gas Storage	Maximum storage pressure	3.8 MPa
10	Purification	Purification treatment capacity	SF6 gas with initial moisture content below 1000 PPM (volume ratio) can be purified in one cycle by this unit
11	Purification	Gas indexes after purification	Moisture content ＜ 60 PPM (mass ratio), oil content ＜ 10 PPM (mass ratio)
12	Leakage Performance	Annual Leakage Rate	≤1% of nominal storage volume
13	Noise	Noise Level	≤75 dB(A) sound pressure level
14	Ambient Condition	Operating Ambient Temperature	-10℃ ~ +40℃
15	Power Parameter	Total Power Consumption	≤5 kW
16	Power Parameter	Power Supply	AC 3-phase 5-wire system, 50Hz, 380V ±10%

SF6 Gas Recovery Unit – FAQ

Q1: What is the main function of an SF6 gas recovery unit?

A1: The SF6 gas recovery unit is specially designed to recover, purify, store and refill SF6 gas during the installation, maintenance and overhaul of SF6 electrical equipment. It avoids SF6 gas emission, reduces operation costs and meets environmental protection requirements.

Q2: What is the working pressure range for SF6 gas recovery?

A2: The unit can recover SF6 gas from an initial pressure of ≤0.8 MPa down to a final recovery pressure of ≤53 kPa, ensuring nearly full gas recovery from electrical equipment.

Q3: How fast can the machine recover SF6 gas?

A3: For a 1 m³ gas chamber with an initial pressure of 0.8 MPa, the unit can recover the gas down to 53 kPa within 2.5 hours.

Q4: What is the SF6 gas charging speed?

A4: It can charge a 1 m³ vacuum chamber from 133 Pa up to 0.8 MPa within 0.8 hours, providing fast and efficient gas filling for switchgear.

Q5: What is the ultimate vacuum degree of the device?

A5: The ultimate vacuum reaches ≤10 Pa. It can evacuate a 1 m³ space from 0.1 MPa to 133 Pa within 1 hour, meeting high-standard vacuum treatment requirements for power equipment.

Q6: Can the unit purify impure SF6 gas?

A6: Yes. The equipment can purify SF6 gas with initial moisture content below 1000 PPM (V/V) in one cycle. After purification, the moisture content is less than 60 PPM and oil content is less than 10 PPM, which meets reusable SF6 gas standards.

Q7: What is the storage capacity and maximum storage pressure?

A7: The storage vessel volume is 0.051 m³ with a nominal liquid SF6 storage capacity of 50 kg. The maximum working storage pressure is 3.8 MPa.

Q8: Is the equipment airtight and reliable?

A8: Yes. The annual air leakage rate is less than 1% of the nominal storage volume, ensuring long-term stable gas storage without frequent pressure drop.

Q9: What is the noise level during operation?

A9: The overall operating noise is ≤75 dB(A), which is low noise and suitable for substation and indoor workshop operation.

Q10: What are the working ambient conditions?

A10: The unit can work stably in an ambient temperature range from -10℃ to +40℃, adapting to most indoor and outdoor power operation scenarios.

Q11: What is the power supply and power consumption?

A11: It adopts 380V ±10%, 50Hz, 3-phase 5-wire AC power supply. The total power consumption is ≤5 kW, which is energy-saving and efficient.

Q12: Is the machine portable and easy to move?

A12: Yes. The whole machine adopts hand-push mobile trolley structure, flexible for on-site movement and convenient for field maintenance work.

Q13: How is the drying and filtration system regenerated?

A13: It adopts vacuum heating regeneration mode for the drying and filtering system, which realizes automatic regeneration of adsorbent, no need for frequent replacement of filter materials and reduces maintenance cost.

Q14: Is the recovered SF6 gas reusable?

A14: Absolutely. After professional purification, dehydration and deoiling treatment, the recycled SF6 gas reaches national and international reusable standards and can be directly refilled into electrical equipment.

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