Ammonia Compressor

Ammonia (NH₃) is a fundamental raw material in the chemical industry and an efficient refrigerant. Its explosion limit in air is 16% to 25%, and it can decompose explosively when exposed to open flames or high temperatures above 530°C. It also has a pungent odor, is toxic, and poses a corrosion risk to metals such as copper and zinc. In processes involving the compression and transportation of ammonia, such as fertilizer synthesis and refrigeration systems, it is essential to select compressors with superior safety and media compatibility. Our diaphragm compressors and piston compressors, specially designed for ammonia service conditions, provide a full-process safe compression solution from raw gas boosting to product filling.

DIAPHRAGM COMPRESSOR

PISTON COMPRESSOR

Ammonia Diaphragm Compressor Core Advantages:

01

Absolutely Oil-Free & 100% Media Purity Assurance:

The hydraulically driven metal diaphragm completes gas compression, achieving 100% oil-free lubrication in the compression chamber. This completely prevents lubricating oil from entering the process system, eliminating the risk of oil contaminating downstream catalysts or products. It is especially suitable for boosting synthesis gas for ammonia production and high-purity electronic-grade ammonia, ensuring final product purity and process stability.
02

Intrinsically Safe Zero External Leakage Seal:

Utilizing a static seal structure, the gas is fully enclosed within the chamber formed by the diaphragm, cylinder head, and valve plate, achieving zero external leakage by design. For ammonia, which is pungent, toxic, flammable, and explosive, this represents the highest level of safety protection, fundamentally eliminating the risks of fire, explosion, and personnel poisoning caused by leakage, and meeting the strictest environmental and safety regulations.

Key Design Points for Ammonia Diaphragm Compressors:

01

Explosion-Proof Electrical System with Class BT Certification:

The entire electrical system, including the drive motor, control cabinet, and field instruments, is designed for ammonia environments and meets Class BT explosion-proof requirements. The motor typically adopts Ex d IIB T4 or a higher rating to ensure safe operation in potentially explosive gas atmospheres. All electrical interfaces comply with flameproof or increased safety standards.
02

Multi-Level Diaphragm Rupture Monitoring & Safety Interlock:

A three-layer diaphragm structure is adopted, equipped with a diaphragm rupture alarm device. When any layer of the diaphragm is damaged, causing abnormal pressure in the middle layer, a pressure switch immediately triggers an audible and visual alarm and an automatic shutdown interlock to prevent oil and gas from mixing and causing a more serious incident. This system is the core active safety protection of the diaphragm compressor.
03

Corrosion-Resistant Material Selection & Surface Treatment:

All wetted parts in contact with ammonia, such as the cylinder head, diaphragm, gas valves, and piping, are preferentially made of 304 or 316L stainless steel. These materials offer excellent resistance to ammonia corrosion. Key components undergo strict degreasing and passivation treatment to remove processing oils and form a stable passive film on the surface, further enhancing corrosion resistance and preventing material failure that could lead to leakage.

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

Explosion-Proof NH3 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

Flow(Nm3/h)

3.9

Inlet pressure(barg)

5.5

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-40/3.9-5.5	500	40	0.39	0.55	1200×800×1100	900	4
2	GZ-66/14.6-18.6	500	66	1.46	1.86	1200×800×1100	900	5.5
3	GZ-60/10-23	1000	60	1	2.3	2400×1800×1600	2600	15
4	GV-150/10.5-30	2000	150	1.05	3	2600×1800×1600	3000	15
5	GV-11/0.027-18	1000	11	0.0027	1.8	1200×800×1100	1000	11
6	GV-100/8-80	2000	100	0.8	8	2600×1800×1600	3000	18.5
7	GL-60/0.05-4	4000	60	0.005	0.4	2400×1800×1600	3000	15
8	GL-60/4	4000	60	Atmospheric	0.4	2400×1800×1600	3000	15
9	GL-40/6.5	4000	40	Atmospheric	0.65	2400×1800×1600	3000	15
10	GD-280/1-3	2000	280	0.1	0.3	3000×2000×1800	4000	22
11	GD-300/1-6	5000	300	0.1	0.6	3500×2300×1800	4500	45
12	GD-600/1.5-5	5000	600	0.15	0.5	3500×2300×1800	4500	45

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

Ammonia Piston Compressor Advantages:

01

Broad Pressure Coverage & High Discharge Pressure Capacity:

The piston compressor can easily achieve stable compression from low pressure to high pressure, perfectly covering the full pressure range of ammonia applications from low-pressure recovery and process boosting to high-pressure liquefaction. Its robust crankshaft and connecting rod mechanism, combined with multi-stage compression design, ensures long-term operational reliability under high loads.
02

Mature Explosion-Proof & Safety Integration Design:

Targeting the flammable and explosive characteristics of ammonia, the piston compressor can be integrated with a complete set of proven explosion-proof safety solutions. From Ex d IIB T4 explosion-proof motors to intrinsically safe control systems, nitrogen purge connections, and combustible gas concentration monitoring, all can be configured modularly to form a complete safety barrier. This makes it particularly suitable for installation in complex hazardous areas such as oil and gas fields and chemical plants.

Key Design Points for Ammonia Piston Compressors:

01

Precisely Matched Explosion-Proof Rating & Temperature Class:

Based on the characteristic that ammonia is a Class IIB explosive gas with an auto-ignition temperature of approximately 530°C, the supporting electrical equipment for the compressor must meet at least the Ex d IIB T4 explosion-proof rating. Simultaneously, by optimizing cooling and design, it ensures that the equipment surface temperature remains below the 135°C required by the T4 temperature class under all operating conditions, providing a sufficient safety margin.
02

Strict Discharge Temperature Control & Efficient Cooling:

To prevent ammonia from decomposing at high temperatures or accelerating material corrosion, the discharge temperature at each stage must be strictly controlled. Design-wise, this is achieved by optimizing the compression ratio and employing efficient inter-stage coolers and cylinder jacket cooling systems to ensure the discharge temperature remains far below the safety limit. The control system is equipped with a high discharge temperature alarm and a high-high shutdown interlock, providing dual protection.
03

Reliable Packing Seal & Safe Disposal of Leaked Gas:

For the dynamic seal of the piston rod, low-friction, self-lubricating PTFE or carbon fiber composite material packing rings are used. For higher-risk applications, a nitrogen buffer seal system can be designed. This injects a trace amount of nitrogen into the packing box, forming a gas barrier. Any potentially leaked ammonia mixed with nitrogen is then directed to a closed recovery pipeline or a safe vent/flare system, rather than leaking into the plant environment. The crankcase is equipped with positive pressure ventilation to prevent ammonia from entering.

Certificate

MODEL SELECTION

Z Type

V / W Type

M Type

D Type

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

Explosion-Proof Ammonia Piston Compressor

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

0.4

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)	(MPag)	(MPag)	(kW)
1	ZW-0.4/10-16	24	1	1.6	5.5
2	ZW-2/10-16	120	1	1.6	30
3	ZW-0.8/16-24	48	1.6	2.4	11
4	VW-7.0/0.1-12	400	0.01	1.2	18.5
5	VW-2.0/2-36	300	0.2	3.6	45
6	VW-3/20	165	0	2	37
7	DW-8.8/4 -18	2050	0.4	1.8	132
8	D-11.8/8-12-35	6250	0.8 - 1.2	3.5	400
9	DW-6.7/38-30	14450	3.9	3	250
10	MW-154/6	10500	0.05	0.6	1100
11	MW-6/15-21	6000	1.5-2.0	2.1	185
12	MW-130/1.5	6800	0	0.15	250