Anshan Libang: define the gas and inlet conditions before selecting a compressor
The official profile traces the business to 2002; the company's uploaded business-license copy records 8 January 2003 as the company establishment date. These describe different parts of the company history.
Its premises are in Anshan's high-technology development zone, laser industrial park. The manufacturer describes an oil-free compressor engineering research center and related group businesses formed from 2012. Identify the actual manufacturer and contracting entity on the order.
The wider catalog covers nitrogen, hydrogen, oxygen and other process gases, recovery equipment, air compression, treatment and storage. Each gas duty has its own configuration and acceptance requirements.
N₂ · boxed reciprocating range
For nitrogen, keep normal flow and upstream pressure on the same line
The nitrogen page describes process boosting, pressure stabilization and purge duties. Its family envelope is 0–1 MPa(G) suction and up to 10 MPa(G) discharge.
The actual table below uses Nm³/h. State nitrogen purity and impurities, supply pressure across operating conditions, normal flow, downstream pressure and hours. Request the normal-volume reference temperature and pressure.
Controller functions include protective shutdown for high discharge temperature, low inlet pressure and high discharge pressure. Remote display/control is a customer-specified option.
| Model | Normal flow | Inlet → outlet | Rated power |
|---|---|---|---|
| WWZTD-20/6-25 | 20 Nm³/h | 0.6 → 2.5 MPa | 4.0 kW |
| VWZTD-20/6-30 | 20 Nm³/h | 0.6 → 3.0 MPa | 4.0 kW |
| VWZTD-20/6-40 | 20 Nm³/h | 0.6 → 4.0 MPa | 5.5 kW |
The 2.5 MPa example lists an Rc 1/2 connection; the 3.0 and 4.0 MPa examples list Rc 1. All three list 1,250 × 720 × 1,200 mm, with masses of 225, 225 and 252 kg respectively. Obtain actual connection and maintenance-access drawings.
Nitrogen model facts and quotation inputs →H₂ · oil-free reciprocating range
Hydrogen selection begins with gas composition and a defined process boundary
The manufacturer names hydrogen-production, process reaction and circulation applications. Its family envelope is 0–0.6 MPa(G) suction and up to 5 MPa(G) discharge.
The reviewed table labels flow in m³/h, not the nitrogen table's Nm³/h. Request reference conditions before comparing volumes between families.
Give actual hydrogen concentration, impurities, inlet temperature and pressure variation, required output, process connection and installation environment. Agree gas-side materials, sealing/leakage acceptance and applicable assembly protection documents with the project engineer.
| Model | Source flow | Motor power | Mass |
|---|---|---|---|
| VWZ-10/0.5-10 | 10 m³/h | 3 kW | 300 kg |
| VWZ-30/0.5-10 | 30 m³/h | 7.5 kW | 380 kg |
| SWZ-90/0.5-10 | 90 m³/h | 18.5 kW | 485 kg |
O₂ · oil-free reciprocating range
Two 30 m³/h oxygen entries have different inlet conditions and packages
The oxygen page gives a family envelope of 0–1 MPa(G) suction and up to 5 MPa(G) discharge. For the same source 30 m³/h and 1.0 MPa outlet entry, the inlet pressure and model change.
These are separate configurations. Confirm pressure/volume reference conditions and actual upstream oxygen pressure before selecting one.
Make the gas package and acceptance basis reviewable
Describe the process stream
Gas composition, purity/impurities, inlet temperature, minimum/normal/maximum inlet pressure, required flow with its reference basis, discharge pressure and operating hours.
Define the supplied equipment
Exact model, stages/cylinders, materials/sealing, cooling, motor/supply, connections, treatment/storage and control/interlock arrangement. Identify the actual manufacturer and contracting entity.
Agree measurable acceptance
Pressure-qualified performance, flow reference conditions, gas-side leakage, cleanliness and applicable approval scope. Request current drawings, inspection/test records and model-specific manuals.
Assign installation and support
Qualified commissioning, installation interfaces, destination compliance responsibilities, original wear parts and service terms. Agree scope before purchase rather than assuming a complete process plant is included.
Standards-project participation
The national standards platform lists Anshan Libang among the drafting organizations for 20256140-T-604, Process compressors—Technical requirements. The reviewed status is approval in progress.
This is a standards plan and drafting role, not an issued standard or product certificate. The actual package still needs its relevant current technical and acceptance documents.
Prepare a gas-specific Libang enquiry
Choose nitrogen, hydrogen or oxygen and include the inlet state, required delivery and project boundary. Attach the process duty sheet so the model and documents can be matched to the same conditions.
Prepare a Libang gas-compressor enquiry →Libang process-gas selection questions
Are nitrogen and hydrogen table flows on the same reference basis?
The nitrogen image labels flow as Nm³/h; the hydrogen and oxygen images label m³/h. Obtain the reference temperature/pressure and selected duty before comparing volumes.
Does the nitrogen family maximum apply to every model?
No. The description gives an envelope; the reviewed 20 Nm³/h rows are separate models at 0.6 MPa inlet and 2.5, 3.0 or 4.0 MPa outlet.
Why must an oxygen enquiry state inlet pressure?
The two 30 m³/h examples at 1.0 MPa outlet use 0.15 or 0.4 MPa inlet and different models, power, dimensions and mass. Match the actual source pressure and reference conditions.
Does a component Ex marking prove the whole hydrogen assembly is approved?
No. Agree applicable protection documentation for the actual assembly, gas and installation environment, together with qualified project review.