Where is 30 bar portable air needed?
30 bar sits at the top of the normal portable-compressor range. In bar and psig terms, 30 bar(g) is 435.1 psig, and 28 bar is 406.1 psig. Typical work in this class includes:
- Very deep borewells and hard-rock DTH drilling, where the column of water and cuttings demands high pressure. Our borewell machines work at 200–400 psig (13.8–27.6 bar), with special units up to 35 bar (507.6 psig).
- Exploration, geothermal and reverse-circulation drilling.
- Pipeline drying, purging and pigging support on oil and gas projects, under the client’s procedures.
- Feeding nitrogen generation units and process equipment that need a high inlet pressure.
- High-pressure blowing and testing support where the test medium and procedure are set by the client’s engineer.
Define the duty first: “30 bar at the process connection for eight hours a day” is a different requirement from “a booster with a 30 bar outlet rating”. The first describes what you need; the second describes one item that might form part of the answer.
Option 1: a standalone high-pressure portable compressor
Some portable compressors are built to reach about 30 bar directly from atmospheric air. They typically use a two-stage oil-injected screw airend and a large diesel engine, often with variable-pressure control so the operator can choose lower pressure and higher flow. Published data for such machines usually shows a working-pressure range, for example from mid-teens to 30 bar, with a flow figure at maximum pressure that is lower than at minimum pressure.
Advantages are simplicity and mobility: one machine, one engine, one set of controls, one tow. The drawbacks are size, weight and fuel consumption, because compressing from atmosphere to 30 bar in one package takes a lot of power. About 7% more power is needed for each extra bar of discharge pressure, so running at 30 bar when the job only needs 24 bar wastes fuel.
Option 2: compressor plus booster
A booster takes air that has already been compressed, typically to around 7–10 bar (101.5–145 psig) or more, and raises it to the final pressure. Boosters are commonly reciprocating machines, though some are screw-based. Because the feed air is already dense, the booster is smaller than a compressor working from atmosphere, but it cannot work on its own.
A booster rating is always linked to its inlet pressure. A unit listed as “30 bar outlet at 7.5 bar inlet” will not give 30 bar at its rated flow if the feed falls to 6 bar. The feed compressor must supply the booster’s inlet flow at the required pressure, plus any losses in the dryer, filters and hoses between them.
Flows do not add together. The final delivery is set by the booster at its outlet, not by the sum of the compressor and booster labels. In practice, a booster arrangement often makes sense where site air at 7–14 bar already exists, or where the job needs moderate flow at high pressure for a long period.
Comparing the two arrangements
| Item | Standalone 30 bar compressor | Compressor and booster |
|---|---|---|
| Final delivery | Flow at 30 bar from the compressor data | Booster outlet flow at its stated inlet pressure |
| Feed air | Atmospheric intake | A suitable compressed-air feed at the booster inlet pressure and flow |
| Energy | One large engine or motor | Two drives; check both power supplies or fuel needs |
| Air treatment | At the final duty | At the booster inlet as well as the final duty |
| Connections | Compressor to point of use | Intermediate connection plus final delivery, all rated for their pressure |
| Footprint and transport | One large unit | Two or more units, often lighter individually |
| Responsibility | One package to confirm | One party should confirm the complete combination |
| Best fit | Remote drilling, mobility, simple set-up | Existing site air, long runs at moderate flow |
Neither option is better for every project. The comparison only works when both proposals are evaluated against the same delivered duty, measured at the same point and on the same pressure basis.
How to frame a 30 bar enquiry
- State the required pressure, in bar(g) or psig, and where it applies: at the tool, the process inlet or the compressor outlet.
- State the flow required at that pressure, in cfm or m³/min of free air.
- Describe the air quality needed: whether water, oil or particles matter, and whether an ISO 8573-1 class is specified.
- Give the duty pattern: continuous, intermittent, or short peaks, and the hours per day and project length.
- Say whether site compressed air exists, with its pressure, flow and availability during the work.
- Give site constraints: access, power supply, fuel logistics, noise limits and ambient conditions.
With this information a supplier can propose either arrangement and explain why. Without it, quotations tend to describe isolated machines, and the gaps appear on site.
An incomplete booster proposal, and how to fix it
Consider an invented enquiry for 30 bar air at a drilling connection. A proposal offers only a booster with a 30 bar outlet rating and a stated 7.5 bar inlet, assuming “site air” will feed it. On review, the site has no compressed air at the location, and the nearest plant compressor runs at 7 bar with no documented spare capacity.
The proposal is incomplete, not necessarily wrong. To complete it, the supplier must add a feed compressor that delivers the booster’s inlet flow at 7.5 bar or above, the treatment between them, rated hoses and a single party responsible for the combination. Only then can it be compared fairly with a standalone 30 bar portable compressor.
Safety at 30 bar
- Every hose, valve, manifold and coupling must be rated above the maximum working pressure and the safety-valve setting.
- Use whip checks or restraints on every hose joint, and keep people out of the line of pressurised hoses.
- Depressurise fully before breaking any connection; trapped pressure between a booster and its feed compressor is a common hazard.
- Check safety valves, shutdowns (high discharge temperature, low engine oil pressure, high coolant temperature) and gauges before mobilisation.
- Pneumatic pressure testing stores very high energy; the client’s approved procedure and engineer govern any test, not the air supplier.
Running high-pressure packages in Indian heat and dust
Higher pressure ratios mean higher discharge temperatures, and summer ambients of 40–45 °C across Telangana and Andhra Pradesh, and above 45 °C on open sites, leave little margin. Keep coolers clean, check cool-box seals and orientation relative to the wind, and watch filter restriction on dusty drilling sites. A booster fed with hot, wet air will run hotter still; an aftercooler and separator between stages protect both machines.
How Reddy Compressors helps
We sell (new and used/refurbished), rent and service portable compressors of ELGi, Atlas Copco, Ingersoll Rand, KAESER, Chicago Pneumatic, Doosan and other makes as an independent multi-brand specialist, not an authorised dealer of any brand; brand names and trademarks belong to their owners. We have tie-ups with all major and reputed brands.
For 30 bar work we offer high-pressure portable compressors and booster compressors for sale, rent from our own fleet (50–2,000 cfm, 2–30 bar, diesel and electric), and service, overhaul and supply spares for existing machines. We look at the whole supply arrangement, compressor, booster if needed, treatment and hoses, and explain why one arrangement suits your duty better than the other. For long projects we can supply brand-new machines to site, with operators from our team of over 20 service engineers and technicians.
Our project experience includes a temporary air package for a natural-gas development at Kakinada, with compressors rated 1,100 cfm at 300 psig, 1,000 cfm at 275 psig and 750 cfm at 150 psig, supplied, commissioned and operated by our team.
Our office is at Srinilayam, 12-13-200, First Floor, Street No. 1, Tarnaka, Secunderabad 500017, and we have served industry since 2002. Call +91 99590 60718 or +91 92468 88812, WhatsApp +91 99590 60718, or email reddycompressors@gmail.com. Our service teams cover the whole of Telangana and Andhra Pradesh, and we supply compressors, rentals and spare parts across India.
What to send us
- Required pressure with unit and where it applies
- Flow required at that pressure and the duty pattern
- Air quality needs or ISO 8573-1 class, if specified
- Any site compressed air available, with pressure and flow
- Project duration, location and site access
- For existing equipment: make, model, serial number and nameplate photo
Frequently asked questions
What is 30 bar in psi?
With 1 bar equal to about 14.5 psi, 30 bar(g) is 435.1 psig. On the same basis, 400 psig is 27.6 bar and 500 psig is 34.5 bar. Make sure both figures are gauge pressure; absolute pressure adds roughly one bar of atmosphere, so 30 bar(a) is only about 29 bar(g). Keep the unit and basis in every document.
Do I need a booster for 30 bar air?
Not always. Some portable compressors reach about 30 bar directly from atmospheric air, so a booster is not automatically required. A booster makes sense when suitable feed air already exists or when moderate flow at high pressure is needed for long periods. Compare both options against the same delivered pressure and flow before deciding.
Can a booster run without a compressor?
No. A booster raises the pressure of air that is already compressed. Its rating is tied to a specific inlet pressure and flow, so it needs a feed compressor or a site air supply that meets those conditions. If the feed pressure falls, the booster’s outlet flow and pressure fall too. The feed source must be part of the proposal.
Why is flow lower at 30 bar than at 20 bar on the same compressor?
A variable-pressure portable has a fixed engine power. Compressing air to a higher pressure takes more energy per unit of air, roughly 7% more power per extra bar, so at maximum pressure the machine delivers less flow. Always read the flow figure at the pressure you will actually use, not at the lowest selectable pressure.
Can I rent a 30 bar compressor for drilling in Andhra Pradesh?
Yes. Our rental fleet covers 2–30 bar and 50–2,000 cfm in diesel and electric versions, and we serve all of Telangana and Andhra Pradesh from our Tarnaka office, with supply to projects across India. We can provide operators and service the machine every 300 running hours on hire. Send the depth, hammer and duty details.
Is it safe to use 30 bar air for pressure testing pipelines?
Pneumatic testing at high pressure stores a large amount of energy, and a failure can be violent. Whether air may be used, the test pressure, hold time and exclusion zone are decided by the client’s engineer and approved procedure.
Related pages
Technical content reviewed by D. Srinivas Reddy, Managing Partner and service engineer, Reddy Compressors. Last updated 17 October 2026. How our engineering content is reviewed.