Nanjing Jiangning
Verified Nanjing manufacturing history, distinct DSP and SDS-U catalogue cases, pressure/flow conditions and the actual quoted production identity.
南京日立产机有限公司 · NANJING, JIANGSU
The Jiangsu provincial workplace-assessment notice of 19 May 2022 also identifies the Nanjing company. That is dated company/workplace evidence, rather than model performance or current certification.
50 HZ · FIXED SPEED · TWO DIFFERENT COOLING ARRANGEMENTS
| Configuration | 0.75 MPaG | 0.86 MPaG | 1.0 MPaG |
|---|---|---|---|
| DSP-90A5N2 Air cooled · 90 kW nominal motor | 16.4 m³/min | 13.9 m³/min | 13.4 m³/min |
| DSP-110W5N2 Water cooled · 110 kW nominal motor | 20.8 m³/min | 18.0 m³/min | 17.2 m³/min |
The brochure lists 380/400/415 V, 50 Hz and inlet ambient 0–45°C. The 110W example requires a listed 180 L/min cooling-water flow with inlet water ≤35°C.
Its 2150 × 1520 × 1820 mm dimensions and 2200 kg mass differ from the 90A’s 2150 × 1520 × 1970 mm and 2130 kg. Add the actual ventilation and maintenance envelope to the installation drawing.
Open the DSP NEXT II selection notes →SDS-U IS FIXED SPEED · SDS-UV IS A DIFFERENT SELECTION
These examples use the brochure’s 50 Hz, 20°C inlet, 0% relative humidity and 0.1 MPa absolute atmospheric pressure basis. They are separate configurations, rather than one unrestricted operating curve.
| Model | Pressure | Capacity |
|---|---|---|
| SDS-U90-C | 0.7 MPaG | 16.7 m³/min |
| SDS-U90-CH | 0.8 MPaG | 15.0 m³/min |
| SDS-U90-CU | 1.0 MPaG | 13.7 m³/min |
The U90-C row lists 12 m³/h cooling water. Its 60 Hz capacity is 16.8 m³/min, which must not replace the 50 Hz figure. Confirm the selected water temperature, pressure and quality, rather than designing from the quantity alone.
Open the SDS-U comparison notes →Send receiving-point pressure, network pressure loss, demand cycle, reference flow and site ambient/altitude. Obtain selected capacity and full/part-load package input at the agreed conditions.
Specify moisture, particles and oil limits at the receiving point, dryer/filter and piping scope, sampling and acceptance. Oil-free compression is not a complete downstream air-treatment specification.
Match exact model to manufacturer/origin. Agree utilities, electrical protection, ventilation, condensate, service access, commissioning, genuine spares, conformity and warranty responsibilities.
No. Obtain the quotation’s manufacturing company and plant. The August 2025 China DSP brochure names a Changshu entity; the Nanjing history records earlier production.
No. Ask for total package input and its load/control conditions, including auxiliaries. Motor output and package electrical input are different quantities.
Only after agreeing the flow reference and conversion. These catalogue quantities are referred to inlet conditions; normal-volume conditions must be specified separately.
Include pressure and flow basis, demand cycle, supply frequency, cooling utilities and point-of-use air quality. Ask the offer to identify the actual manufacturer and origin.
Prepare the Hitachi selection RFQSpecification pages
| Duty | Write on the RFQ |
|---|---|
| Compressor for a food factory | Food air is a validation file. Class, test point and treatment matter as much as kW. A general 8 bar screw without papers is not a food quote. |
| Compressor for a pharmaceutical plant | Pharma procurement is a document pack: IQ/OQ support, material certs, residual oil. The machine is the easy part if the RFQ lists the papers. |
| Class 0 oil-free compressor | Class 0 means a stated test method at a stated point in the air system. An oil-free airend without a paper is not Class 0 on this desk. |
| Oil-free screw compressor manufacturers in China | Oil-free screw is a different factory from oil-injected screw. Dry airends and water-lubricated airends are also different quotes. Name the architecture. |
Information reviewed 2026-10-08. Specifications apply only to the models and conditions stated.
Hitachi IEC: Verified Nanjing manufacturing history, distinct DSP and SDS-U catalogue cases, pressure/flow conditions and the actual quoted production identity.
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