Hydrogen Sulfide Compressor

Hydrogen sulfide (H₂S) is a highly toxic, flammable, explosive, and strongly corrosive gas. Its compression poses a key challenge in natural gas purification, petroleum refining, and the chemical industry. The corrosion is primarily driven by two mechanisms: wet H₂S environments cause electrochemical corrosion and hydrogen-induced cracking; at high temperatures (≥230 °C), H₂S directly reacts with metals, with hydrogen further accelerating the corrosion. If chloride ions are also present, the risk of stress corrosion cracking in stainless steel increases. Therefore, an H₂S compressor must feature absolute sealing, excellent corrosion resistance, and comprehensive safety protection.

DIAPHRAGM COMPRESSOR

PISTON COMPRESSOR

Advantages of Hydrogen Sulfide Diaphragm Compressor:

01

Absolute Sealing and Zero Contamination:

A metal diaphragm is used to completely physically isolate the process gas from the hydraulic oil, forming a static seal. This fundamentally eliminates the risk of toxic gas leaking into the environment and prevents lubricating oil from entering the process system where it could be contaminated by or react with H₂S, ensuring both gas purity and operational safety.
02

Excellent Resistance to Complex Corrosion:

All flow-wetted components, including the diaphragm head chamber, cover plate, and inlet/outlet valve assemblies, can be specifically constructed from high-grade corrosion-resistant alloys. This allows for a flexible design that effectively addresses electrochemical corrosion, hydrogen permeation, and potentially accompanying Cl⁻ corrosion in wet H₂S environments.

Key Design Points for Hydrogen Sulfide Diaphragm Compressor:

01

Full Anti-Corrosion Materials for the Diaphragm Head and Flow-Wetted Parts:

Material selection must be strictly in accordance with standards such as SH/T 3096, based on specific H₂S partial pressure, temperature, water content, and Cl⁻ concentration. Typically, 316L stainless steel, with its better pitting resistance and resistance to Cl⁻ stress corrosion cracking due to its molybdenum content, is the preferred basic choice. For extremely harsh conditions, duplex stainless steel or nickel-based alloys must be used. All components should have clearly specified material grades and ensure sufficient corrosion allowance (typically ≥ 2 mm).
02

Special Material Selection and Monitoring for the Core Diaphragm:

As a critical dynamic component, the diaphragm must simultaneously possess very high fatigue strength, flexibility, and corrosion resistance. Materials like Inconel 718, a high-strength corrosion-resistant alloy, are commonly selected. A diaphragm rupture monitoring and alarm system must be provided. In the event of a pinhole leak or rupture, the system should immediately alarm and trigger a shutdown to prevent oil-gas mixing and safety accidents.
03

Integrated Safety and Surface Protection Design:

The compressor skid should be integrated with a high-efficiency inlet gas-liquid separator to ensure the gas entering the compressor is as dry as possible, mitigating wet corrosion at the source. All exposed metal parts must undergo professional surface anti-corrosion treatment to resist atmospheric corrosion. The safety valve discharge port must be connected to a closed flare system or caustic scrubber; local venting is strictly prohibited.

Certificate

MODEL SELECTION

Model G70Z/G95Z/G110Z/G130Z	Piston Stroke 70mm~130mm	Maximum Piston Force 10KN~30KN
Maximum Discharge Pressure 70Mpa	Flow Range 1~500Nm³/h	Motor Power 2.2KW~30KW
Crankshaft Speed 420rpm	Cooling Method Water Cooled/Air Cooled

Model G70V/G95V/G130V	Piston Stroke 70mm~130mm	Maximum Piston Force 10KN~30KN
Maximum Discharge Pressure 50Mpa	Flow Range 1~200Nm³/h	Motor Power 2.2KW~30KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Model G110L/G130L	Piston Stroke 110mm~130mm	Maximum Piston Force 20KN~40KN
Maximum Discharge Pressure 100Mpa	Flow Range 10~1000Nm³/h	Motor Power 7.5KW~90KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

High Efficiency H2S Diaphragm Compressor

Model G110D/G130D/G150D/ G180D/G182D/G210D	Piston Stroke 110mm~210mm	Maximum Piston Force 20KN~160KN
Maximum Discharge Pressure 100Mpa	Flow Range 30~2000Nm³/h	Motor Power 22KW~200KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Diaphragm type compressor

Piston stroke 70mm

3.5

Flow(Nm3/h)

Inlet pressure(barg)

Outlet pressure(barg)

No.	Model	Cooling water	Flow	Inlet pressure	Outlet pressure	Dimensions L×W×H	Weight	Motor Power
No.	Model	(L/h)	(Nm³/h)	(MPa)	(MPa)	(≈mm)	(≈kg)	(kW)
1	GZ-3.5/2-15	500	3.5	0.2	1.5	1000×800×1100	800	4
2	GZ-30/0.15-5	1000	30	0.015	0.5	1200×900×1200	800	7.5
3	GZ-66/2.5-15	1000	66	0.25	1.5	2200×1700×1600	2500	11
4	GV-24/2.5-20	1000	24	0.25	2	1400×900×1200	1000	5.5
5	GV-30/(0.1-1)-3	1000	30	0.01-0.1	0.3	1400×900×1200	900	7.5
6	GV-120/3.5-12	2000	120	0.35	1.2	2030×1045×1700	3000	22
7	GL-150/1-2.5	1000	150	0.1	0.25	2200×1800×1600	3000	11
8	GL-60/1-15	1000	60	0.1	1.5	2300×1300×1200	3000	15
9	GL-110/4.5-14	2000	110	0.45	1.4	2400×1300×1300	3000	18.5
10	GD-991/8.5-12	3000	991	0.85	1.2	3200×1800×1900	4000	30
11	GD-587/(0.2-0.25)-1.4	8000	587	0.02-0.025	0.14	4200×4000×2200	12000	55
12	GD-1352/5-12	8000	1352	0.5	1.2	3800×2200×2000	6000	75

The equipment size and weight are for reference only, and the final design shall prevail.

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CASE STUDY

Russia
UNITED STATES
Spain
Kazakhstan

Advantages of Hydrogen Sulfide Reciprocating Compressor:

01

High Single-Unit Capacity and Wide Operating Condition Adaptability:

Reciprocating compressors can achieve very large gas handling capacities. With multi-stage compression, they can flexibly adapt to a wide pressure range from atmospheric to high pressure, meeting the large-flow sour gas compression needs of large natural gas processing plants and refining units.
02

Mature Technology and Extensive Maintenance Experience:

As a conventional machine type, its design, manufacturing, operation, and maintenance have a deep global track record. The spare parts supply chain is relatively well-established, making it particularly suitable for use in oil and gas fields and refineries with existing mature systems.

Key Design Points for Hydrogen Sulfide Reciprocating Compressor:

01

Special Materials and Hardness Control for Critical Moving Components:

This is the core defense against Sulfide Stress Corrosion Cracking (SSC).

Piston Rod: Must be made of SSC-resistant materials, such as precipitation-hardening stainless steel 17-4PH, with its surface hardness strictly controlled within the ideal range of HRC 37–41. It typically requires an ultra-hard, dense coating such as High Velocity Oxygen Fuel (HVOF) sprayed Tungsten Carbide (WC) to ensure wear resistance and act as a barrier against hydrogen permeation.

Cylinder and Cylinder Liner: Depending on the pressure rating, a solid stainless steel cylinder (304/316) or a cast iron/cast steel cylinder lined with a 316L stainless steel liner can be used. The liner must undergo precision machining and surface treatment.

Gas Valves: Valve plates and springs must be made of special corrosion-resistant, fatigue-resistant alloys such as 17-7PH or Inconel X-750.
02

Oil-Free Lubrication and Special Packing Seal System:

To prevent the lubricating oil from being contaminated or degraded by H₂S and forming corrosive by-products, a completely oil-free lubrication design is prioritized. Piston rings and rider rings use self-lubricating materials such as filled Polytetrafluoroethylene (PTFE) or Polyetheretherketone (PEEK). The packing system must be designed with a nitrogen purge or buffer seal to direct any potentially leaking trace amounts of H₂S to a sealed collection vessel and ultimately to a flare, preventing it from entering the crankcase or the atmosphere.
03

Systematic Corrosion Control and Safety Protection:

Strict Medium Pretreatment: A high-efficiency separation and deep drying device must be installed upstream of the compressor inlet to strictly control the liquid water and impurity content in the intake gas.

Precise Temperature Control: By optimizing inter-stage cooling and cylinder cooling design, the cylinder wall temperature and discharge temperature are precisely controlled to prevent them from falling below the water dew point, thereby avoiding condensate formation and minimizing wet corrosion to the greatest extent possible.

Comprehensive Monitoring and Safety Interlocks: In addition to conventional pressure, temperature, and vibration monitoring, fixed H₂S gas concentration detectors and alarms must be installed around the compressor and in low-lying areas, interlocked with the emergency ventilation system. All electrical instrumentation must be designed to an explosion-proof rating of IIC T4 (or higher). An independent Safety Instrumented System (SIS) should be provided to implement emergency shutdown for hazardous conditions such as overpressure, overtemperature, and gas leakage.

Certificate

MODEL SELECTION

Z Type

V / W Type

M Type

D Type

Hydrogen Sulfide Reciprocating Compressor

Piston stroke 80mm, 95mm	Piston force 10KN～25KN
Power 7.5KW-55KW	Number of cylinder banks 1/2
Crankshaft speed 740 rpm, 980 rpm	Number of compression stages 1/2/3/4
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm, 95mm, 105mm, 120mm	Piston force 25KN, 45KN, 65KN
Number of compression stages 1/2/3/4	Number of cylinder banks 2/3/4
Crankshaft speed 740 rpm, 980 rpm	Power 15KW-220KW
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm~315mm	Piston force 45KN~660KN
Number of compression stages 1/2/3/4	Number of cylinder banks 4
Crankshaft speed 300rpm~980rpm	Power 160KW-3000KW
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm~315mm	Piston force 25KN~200KN
Number of compression stages 1/2/3/4	Number of cylinder banks 2
Crankshaft speed 300rpm~980rpm	Power 30KW-1000KW
Drive mode Electric motor, diesel engine, natural gas engine

Vertical type

Oil-free / F: Air-cooled

Actual volume flow (m3/min)

Inlet pressure(barg)

Outlet pressure(barg)

S/N	Model	Flow	Inlet pressure	Outlet pressure	Motor power
S/N	Model	(Nm³/h)	(Mpa)	(MPa)	(kW)
1	ZW-3/2-3	480	0.2	0.3	11
2	ZW-5.5/2-6	900	0.2	0.6	45
3	ZW-2/20	110	atm	2	22
4	VW-7.0/0.1-1.0	400	0.01	0.1	18.5
5	VW-2.0/2-36	300	0.2	3.6	45
6	VW-0.84/5-40	250	0.5	4	45
7	DW-3.37/4-35	900	0.4	3.5	135
8	D-1.47/10-30	800	1-1.2	3	110
9	D-1.1/10-35	600	1-1.2	3.5	75
10	MW-154/6	10500	0.05	0.6	1100
11	MW-6/15-21	6000	1.5-2.0	2.1	185
12	M-40/3-7	9000	0.3	0.7	450