Wuhu · Anhui · Diaphragm gas compressors
Zhongding Hengsheng · specify the gas and the pressure envelope
中鼎恒盛气体设备（芜湖）股份有限公司 develops and manufactures diaphragm gas compressors in Wuhu. Its history begins with Beijing Zhongding in 2008; an original listed-company disclosure separately records the Wuhu legal entity's establishment on 9 November 2009.
The G0–G5 catalogue spans compact/process configurations and large diaphragm machines. Gas composition, inlet conditions, outlet pressure and flow must be selected together. A family code alone does not define a usable gas duty.
G5 · same delivery and outlet pressure, different inlet conditions
750 Nm³/h at 21 MPa(g) does not tell the whole story
These two named G5 rows show how a different inlet pressure changes the listed motor, cooling-water requirement and machine weight. Select the actual duty; do not apply the smaller drive to the lower-pressure suction condition.
GD5-750/6-210
0.6 → 21 MPa(g)
- Published normal-volume flow
- 750 Nm³/h
- Motor / speed
- 160 kW · 420 rpm
- Cooling water / weight
- 12,000 L/h · 16,000 kg
GD5-750/15-210
1.5 → 21 MPa(g)
- Published normal-volume flow
- 750 Nm³/h
- Motor / speed
- 110 kW · 420 rpm
- Cooling water / weight
- 10,000 L/h · 14,000 kg
Read the conditions beside the rating
Both rows list 4300 × 3200 × 2200 mm. Obtain the current project drawing and actual gas selection. These are separate model points, not a guaranteed operating range of one machine.
MPa(g) is gauge pressure. Nm³/h needs its normal reference temperature and pressure. Agree cooling-water temperature/pressure, suction variation and total-package electrical data.
G5 references and installation requirements →Compact and medium process routes
Keep each model's inlet, outlet and medium together
G0 · two distinct small-machine points
| GZ0-2/0.6-10 | 2 Nm³/h 0.06 → 1 MPa(g) 1.5 kW · 750 rpm 1000 × 600 × 870 mm · 300 kg |
|---|---|
| GZ0-26/180-200 | 26 Nm³/h 18 → 20 MPa(g) 1.5 kW · 750 rpm Water: 300 L/h 1200 × 780 × 1050 mm · 450 kg |
The same motor rating accompanies different flow and pressure conditions. G1 and G2 need their own named selection; neither inherits these G0 ratings.
Compact/process family details →
G3 and G4 · separate pressure/flow points
| GZ3-50/10-150 | 50 Nm³/h · 1 → 15 MPa(g) 11 kW · 400 rpm Water: 1000 L/h 2400 × 1400 × 2000 mm · 3500 kg |
|---|---|
| GD4-200/15-350 | 200 Nm³/h · 1.5 → 35 MPa(g) 55 kW · 360 rpm Water: 4600 L/h 3800 × 2600 × 1800 mm · 9000 kg |
Layout before purchase
Allow space to remove components, not just fit the skid
The catalogue publishes family maintenance provisions. The component lifting requirement differs from shipping or whole-machine weight. Use the current ordered configuration's service drawing to confirm the final layout.
- G0 maintenance
- At least 1 m around machine
60–70 kg maintenance component - G4 maintenance
- At least 1.5 m around machine
Approximately 1000 kg maintenance component - G5 maintenance
- At least 2.5 m around machine
Approximately 5000 kg maintenance component
Agree lifting equipment, overhead clearance, component removal path, floor/foundation loads, isolation and maintenance procedure. A G5 reference's 14–16 tonne machine weight and its 5 tonne service component answer different planning questions.
Match the manufacturing and test scope to your gas duty
Assembly and diaphragm process
The company describes automated assembly with manual assistance, diaphragm heat/surface treatment and cylinder-head geometry adapted to medium and pressure. Request the actual material, diaphragm revision, inspection and traceability scope for the offered machine.
Test medium and operating point
Zhongding describes a hydrogen test facility that simulates customer conditions. Agree the test medium, inlet/outlet envelope, duration and acceptance records for your order. The facility description does not prove identical hydrogen testing for every machine.
Prepare a gas-duty brief that can be engineered
- Medium and inlet supply
- Gas composition, impurities and required purity; minimum/normal/maximum inlet pressure and temperature; supply variation and hazardous-area requirements.
- Required delivery
- Outlet pressure and load range; normal-volume flow with reference temperature/pressure; operating hours, starts and demand profile. Daily filling kilograms alone are insufficient.
- Plant interfaces
- Cooling-water availability and conditions, electrical supply, controls integration, layout, foundation and component lifting route.
- Acceptance and handover
- Current materials/diaphragm and drawings; agreed leak monitoring and protective functions; test medium/conditions and records; wear parts, startup training and destination support responsibilities.
Zhongding selection questions
Why do two 750 Nm³/h G5 records list different motor powers?
The published inlet pressures differ: 0.6 versus 1.5 MPa(g), with the same 21 MPa(g) outlet. Keep the entire named duty point together and obtain current selection for your actual inlet range.
Is the reported 220°C inlet temperature a G2 series limit?
It is a condition in one manufacturer-reported hydrogen/ammonia-mixture project. Obtain explicit engineering confirmation for your gas, temperature, materials, seals and protective functions.
Does “5000 kg maintenance component” mean the G5 machine weighs 5 tonnes?
No. The two selected G5 catalogue rows list 14,000 and 16,000 kg whole-machine weights. The separate component value concerns lifting during maintenance.
Can a hydrogen filling target in kg/day select the compressor?
Provide hourly demand and its flow basis, actual gas, suction pressure/temperature range and required outlet pressure, alongside cooling and controls. The daily total alone does not define the compression duty.