Shanghai United / United OSD
- Founded
- 2002
- Company address
- Nanxiang, Jiading, Shanghai
- Business
- Air compressors · Compression air ends · Compressed-air energy services
United describes in-house screw-profile development and air-end production, alongside complete compressor engineering. Its published workflow combines basic technology research, product development, collaborative technical documents and pilot validation.
Hitachi Industrial Equipment Systems records a 30% investment in Shanghai United OSD in September 2013. This historical relationship does not make every current United model a Hitachi-manufactured machine.
Three existing equipment routes
Start with demand, pressure and air quality
UD-VPM screw
Single-stage oil-injected compression with a permanent-magnet variable-speed drive.
Selection question: What pressure-matched delivery and package input does the exact model provide over your demand profile?
OSD dry oil-free
Two-stage dry screw construction with manufacturer-described Hitachi air ends.
Selection question: What model evidence and downstream treatment meet the complete point-of-use quality requirement?
Gear-driven centrifugal
Multi-shaft, gear-driven compression with separate air and lubrication seal arrangements.
Selection question: What operating map and control strategy suit normal, peak and low demand?
Single-stage micro-oil screw
UD-VPM · 5.5–55 kW family
- Published working pressure
- 7–10 bar
- Published working air quantity
- 0.9–10.6 m³/min
- Drive
- Permanent-magnet variable speed
These are family ranges, not a single model's simultaneous ratings. Obtain the pressure-matched air delivery, reference conditions and test basis.
The description identifies an oil-injected air end and integrated drive arrangement. IP65 is a motor enclosure reference in this range's description; confirm the offered motor and drive, rather than assigning that rating to the whole machine.
Review UD-VPM selection information →Dry oil-free screw
OSD · 37–500 kW family
- Published working pressure
- 2–10 bar
- Published working air quantity
- 5.3–80 m³/min
- Construction / control
- Two-stage dry compression · ITCS described
The manufacturer describes Hitachi air ends, rotor/casing coating, seals separating the compression chamber from lubrication, and interstage/after cooling. Confirm the offered cooling circuit, drive and control interfaces.
Pressure, air quantity and power are family ranges. Require a complete model selection for your duty, including package input and permitted operating conditions.
Review OSD equipment and quality inputs →
Specify the whole air-quality requirement
| Quality | What belongs in the enquiry |
|---|---|
| Oil | Required oil content/class, exact model evidence and applicable test scope |
| Water | Pressure dew point and drying duty under the installation's conditions |
| Particles | Required particle quality and downstream filtration/distribution boundary |
| Process-specific quality | Any microbiological or other process requirement and its acceptance method |
Oil-free compression does not establish sterile air or the entire purity specification. Include treatment and distribution in the supply boundary.
Gear-driven centrifugal route
Select a machine and its operating map
- Gearbox
- Horizontally split, multi-shaft H-layout; low-speed gear drives the high-speed compression shafts.
- Bearings
- The description identifies high-speed tilting-pad bearings and a combined radial/thrust arrangement on the low-speed side.
- Seals
- Separate oil/gas labyrinth seals with a vented buffer space between them.
Request selected pressure/delivery, inlet conditions, minimum stable delivery and the control/anti-surge or recycle strategy. Define operation with other station equipment during low demand and transitions.
This gear-driven route is separate from United's YB/YC high-speed centrifugal technology. Identify the construction in the offer.
Review centrifugal procurement information →Build the station enquiry around actual operating cases
Demand and pressure
Provide demand over time, minimum/normal/peak delivery, point-of-use pressure, known system losses, schedule and standby needs.
Site and quality
State power supply, ambient/ventilation or cooling utilities, complete air-quality requirements, drying/filtering duty and measurement points.
Equipment and integration
Identify compressor configuration, receivers, treatment, pipework, controls/interfaces, utilities and site work included.
Acceptance and handover
Agree selected-duty performance/input evidence, applicable model documents, control/interlock records, commissioning, training, service and spares.
United also lists refrigerated and adsorption drying equipment. Select treatment for the actual duty; a compressor family maximum is not a station design.
Questions before selecting United equipment
Do the family ranges describe one machine?
No. Pressure, working air quantity and power are ranges across the published family. Require the exact model's pressure-matched delivery, reference conditions and input.
Does oil-free mean the process air is sterile?
No. Define oil, water, particles and any process-specific microbiological requirement at the measurement location. Agree model evidence, treatment and distribution accordingly.
Are all United centrifugal machines the same construction?
No. The gear-driven multi-shaft route and the separately listed YB/YC high-speed technology are different. The complete model, construction and operating map should appear in the offer.
Does the 2013 Hitachi investment identify the machine's manufacturer?
It establishes a historical corporate relationship. The offered air end, machine manufacturer, manufacturing site and documents must be identified separately for the order.