Diesel portable compressor for sale in Hyderabad: new, used, refurbished

Size classes: match the machine to the job, not the brochure

Most buying mistakes start with the wrong class. A buyer sees a cheap 185 cfm unit and expects it to run two breakers and a sandblast nozzle, or buys a 14 bar drilling machine for road work and pays for engine power he never uses. Choose the class from the tools and the working pressure first. The table gives the classes buyers in Telangana and Andhra Pradesh usually look at.

Pressure and flow are separate choices. A 10 bar machine needs roughly 7% more shaft power per extra bar than a 7 bar machine of the same flow, and at a given engine size the flow falls as pressure rises. If your tools work at 6–6.5 bar at the tool, a 7 bar machine with well-sized hoses is usually right. The deeper theory of classes and pressure is on our diesel portable compressor engineering guide.

Matching the compressor to common site jobs

Breakers and road works

A hand-held breaker of the 20–30 kg class typically uses about 50–70 cfm at around 6 bar; check the tool plate, because heavier breakers and worn tools use more. Road works in Hyderabad and the district towns usually mean two or three breakers, a road cutter and sometimes a blower for cleaning before patching. That points to the 185–250 cfm class at 7 bar(g).

Sandblasting

One No. 6 nozzle (about 3/8 inch, 9.5 mm bore) uses about 200 cfm when new at 7 bar. Nozzles wear quickly, and a worn nozzle passes much more air. In practice a single No. 6 nozzle is normally run from a 300 cfm compressor at 7–8 kg/cm² (6.86–7.85 bar). Two nozzles need the 600 cfm class. Blasting also needs an aftercooler and moisture separator, because wet air spoils the profile and the paint; in monsoon humidity this is not optional.

DTH drilling and borewells

DTH hammers need both high pressure and high flow, and the requirement rises with depth and water ingress. Borewell machines sit in the 1,000–1,300 cfm class at 17–25 bar(g) and above; a 185–450 cfm portable is not a borewell compressor. Use our DTH compressor selection guide before buying for drilling.

Piling and foundation work

Air is used on piling jobs for air-lift cleaning of bored piles, DTH drilling of rock sockets and general site tools. Air-lift cleaning usually suits the 300–450 cfm class at 7 bar(g); rock-socket DTH work moves into the high-pressure classes. Size from the hammer or air-lift maker’s figure, not from the rig size alone.

Worked example: sizing a road-works compressor (illustrative)

A municipal contractor runs three 25 kg breakers at the same time and wants spare air for a blower.

1. Breakers: 3 × 65 cfm = 195 cfm (5.52 m³/min).
2. Allowance for tool wear and hose leakage, 10%: 195 × 1.10 = 214.5 cfm, say 215 cfm (6.09 m³/min).
3. Blower used only between breaker runs, so not added to the peak.
4. Choice: a 250 cfm, 7 bar(g) machine. A 185 cfm unit would leave the third breaker starved; a 400 cfm unit would idle much of the day and burn fuel unloaded.

Worked example: sizing for sandblasting (illustrative)

1. Two No. 6 nozzles new: 2 × 200 cfm = 400 cfm at 7 bar.
2. Allow for nozzle wear before replacement, about 30% more air: 400 × 1.30 = 520 cfm (14.72 m³/min).
3. Add aftercooler and separator pressure losses: run the machine at 7–8 kg/cm².
4. Choice: a 600 cfm class machine. Rule of thumb holds: about 300 cfm per No. 6 nozzle.

New, refurbished or used: which should you buy?

All three are sound purchases when the machine suits the duty and its condition is known. They differ in capital, risk and how long the machine will stay economical. Our definitions are fixed: used means sold as inspected, with its condition reflected in the price; refurbished means worn parts beyond routine items have also been replaced or overhauled; ask for the list of work done. Full details are on our used and refurbished compressors page.

Two engine questions matter more than buyers expect. First, emission stage: newer diesel engines are built to tighter emission stages, often with electronic fuel injection and, on some engines, after-treatment such as an oxidation catalyst, particulate filter or urea dosing. They are cleaner and often quieter, but need correct fuel quality, a working diagnostic link and a technician who can read fault codes. Older mechanical engines are simpler to repair on a remote site but smoke more and may be refused on sites with stricter environmental rules. Ask the main contractor what the project accepts before you buy. Second, spares availability: check that filters, injectors, belts, sensors and controllers for that engine model are obtainable in India, not only for the airend. A cheap machine whose engine parts take weeks to arrive costs far more in lost days than it saved.

Chassis, towing and transport

How the machine moves on your jobs should shape the purchase as much as cfm.

• Two-wheel towable chassis: common up to the medium classes; quick to move between road-work spots. Check tyre condition, wheel bearings, the towbar eye, parking brake and the jockey wheel.
• Four-wheel chassis: more stable on long tows and heavier machines; check the turntable steering and brakes.
• Skid-mounted: usual for large high-pressure drilling machines and machines that stay put on one site. Must be moved by truck or trailer; check lifting eyes and fork pockets.
• Truck-mounted: common on borewell rigs; check mounting bolts and frame cracks where the package sits on the chassis.
• Road towing: towing on public roads needs working lights, a safety chain and a vehicle rated for the gross weight. Check the gross weight on the maker’s plate, not a dealer’s estimate.
• Transport cost: include delivery from the seller to your yard and the first site. For distant districts it is a real line item.

Ownership cost per hour worked

The price of the machine is only one part of what each working hour costs. Fuel dominates on busy machines; capital dominates on idle ones. The example below uses a 400 cfm, 7 bar(g) machine and takes the shift-average fuel use of 15.0 litres per hour from the fuel estimate on our diesel portable compressor guide. All rupee figures are illustrative; not anyone’s price.

Worked example: cost per working hour (illustrative; not anyone’s price)

Assumptions: capital ₹24,00,000 for a new machine; resale value 35% after 5 years; finance cost 10% a year on average capital; service and spares ₹150 per hour; diesel ₹95 per litre at 15.0 L/h; insurance and yard costs ₹30 per hour.

1. Depreciation at 1,500 h/yr: ₹24,00,000 × (1 − 0.35) ÷ (5 × 1,500) = ₹15,60,000 ÷ 7,500 = ₹208 per hour.
2. Finance: average capital (₹24,00,000 + ₹8,40,000) ÷ 2 = ₹16,20,000; × 10% = ₹1,62,000 a year; ÷ 1,500 = ₹108 per hour.
3. Fuel: 15.0 × ₹95 = ₹1,425 per hour.
4. Total: 208 + 108 + 150 + 1,425 + 30 = ₹1,921 per working hour.

What the numbers say: at 1,500 hours a year, fuel is about three-quarters of the cost, so engine condition and correct sizing matter more than a small difference in price. At 500 hours a year, the fixed cost per hour of a new machine triples, and a refurbished machine, or hiring, closes much of the gap. Run your own figures in the rental versus ownership calculator.

Pre-delivery inspection checklist for the buyer

Whether you buy from us or anyone else, check these points before the machine leaves the yard. A seller who will not run the machine loaded for you is telling you something.

For a deeper method, see our used compressor technical due diligence guide. If the machine is already in service and has faults, our diesel portable compressor troubleshooting page explains what each symptom points to.

Indian site conditions to plan for

• Heat: Telangana and Andhra Pradesh afternoons reach 40–45 °C, hotter in direct sun on open ground. Ask what ambient temperature the machine is rated for at full load. A machine rated for a cooler climate will trip on high temperature in May.
• Dust: quarry, road and construction dust blocks air filters and cooler cores. Two-stage air filtration with a dust evacuator and easy access to cooler cores are worth paying for.
• Monsoon humidity: more condensate in the air lines. For blasting, painting and pneumatic tools, add an aftercooler and moisture separator.
• Fuel quality: water and dirt in diesel damage injection systems, especially on newer engines. Fit and drain a water separator daily.
• Altitude: Hyderabad sits around 500 m, with the atmosphere at about 0.950 bar(a) against 1.01325 bar(a) at sea level. Most machines are within their engine rating at this height, but check the maker’s derating if you also work on hill sites.

Hire before you buy

If you are unsure of the size class, the pressure or how many hours a year you will use the machine, hire first. A few weeks on hire, with an hour meter and a fuel log, gives you the real duty: average load, peak flow, pressure at the tool and fuel per day. That data makes the buying decision much safer. Our own fleet covers 50–2,000 cfm and 2–30 bar, with special high-pressure DTH and borewell units up to 35 bar. Read diesel or electric rental air first if a grid supply might be available on your site, because an electric machine on a stable supply usually costs far less per hour to run.

How Reddy Compressors helps

• Sells new, used and refurbished diesel portable compressors of all major makes; independent multi-brand suppliers since 2002, not an authorised dealer, with tie-ups with all major and reputed brands.
• Used and refurbished compressors carry a 6-month warranty from the delivery or invoice date, covering the whole compressor; excludes consumables, misuse or wrong oil, service by others, and accident or site damage.
• Own rental fleet from 50 to 2,000 cfm and 2 to 30 bar, plus high-pressure DTH and borewell units up to 35 bar, so you can hire before you buy.
• Service, AMC and spare parts for all major makes, with 20+ service engineers and technicians.
• Coverage across Telangana, Andhra Pradesh and districts within about 300 km of Hyderabad; supply across India.

What to send us

• The tools or job: breakers, blast nozzles, DTH hammer and bit size, piling method, and how many run at once.
• Working pressure needed at the tool and hose lengths.
• Expected hours a year and project length.
• New, refurbished or used preference, and any emission or noise rules on your sites.
• Delivery location and how the machine will move between sites (towed, trailer or truck).
• If you are replacing or adding to a fleet: nameplate photos of your existing machines and their hour meters.

Frequently asked questions

Where can I find a diesel portable compressor for sale in Hyderabad?

Reddy Compressors in Tarnaka, Secunderabad, sells new, used and refurbished diesel portable compressors of all major makes and supplies them across Telangana, Andhra Pradesh and India. Tell us the tools, the working pressure and the hours you expect, and we will match the size class rather than push a particular unit. Call or WhatsApp 99590 60718, or 92468 88812; we are open seven days, 8:30 to 20:30.

What decides a diesel air compressor price?

Mainly flow (cfm), pressure rating and engine size, then the engine’s emission stage, chassis type, controller, aftercooler and separator, and for used machines the hours and condition. A 10 bar machine costs more than a 7 bar machine of the same flow because it needs more engine power, and high-pressure drilling machines cost much more again. Compare quotes on the same free air delivery at the same pressure, and on what is included, not on headline cfm alone.

Is a second hand diesel compressor a good buy?

Yes, when the machine suits your duty and its condition is checked under load. The main risks are a worn airend, a tired engine and a doctored hour meter. Ask for a loaded run of at least 30–60 minutes, a flow check, shutdown tests and the service history. From us, used and refurbished compressors carry a 6-month warranty from the delivery or invoice date. For very high annual hours, compare the cost per hour of a new machine first.

What should I check before buying a used portable compressor?

Match nameplates and serial numbers to the paperwork, compare the hour meter with records and wear, start it from cold, and run it loaded at rated pressure for at least half an hour. Check delivered flow, discharge and coolant temperatures, engine oil pressure, smoke, blow-by and oil carry-over at the service valve. Test the safety shutdowns, look at the separator vessel nameplate and the cooler cores, and check tyres, brakes and towbar. The checklist table above gives the pass point for each.

Which portable air compressor is best for sandblasting?

Size by nozzle. One No. 6 nozzle uses about 200 cfm when new at 7 bar, and is normally run from a 300 cfm compressor at 7–8 kg/cm² to allow for nozzle wear and losses. Two nozzles need about 600 cfm. Add an aftercooler and moisture separator, because wet air ruins the blast profile and coating, especially in the monsoon. A 185 cfm unit is too small for continuous blasting with a No. 6 nozzle.

Should I buy a new or refurbished portable compressor?

Buy new if the machine will run 1,500 hours a year or more for several years, or if your client specifies new plant and a current engine emission stage. Buy refurbished for steady contract work where capital matters; ask for the list of work done and what was not done. In our illustrative cost example, at 500 hours a year a refurbished machine cost about ₹2,208 per hour against ₹2,553 for new (illustrative; not anyone’s price).

Can I use a 185 cfm portable compressor for a borewell?

No. DTH borewell drilling needs high pressure and high flow, typically the 1,000–1,300 cfm class at 17–25 bar(g) and above, depending on depth, hammer size and water. A 185–250 cfm, 7 bar machine is a breaker and road-works compressor. Using it for drilling will stall the hammer, fail to lift cuttings and overheat the machine. See our DTH selection guide before buying for drilling.

Related pages

• Diesel portable compressors: engineering guide
• Used and refurbished compressors for sale
• Used air compressors for sale in Hyderabad
• Diesel portable compressor troubleshooting
• Diesel or electric rental compressor
• Portable air compressors
• Used and reconditioned borewell compressors
• Air compressor rental in Hyderabad