The district from a compressed-air point of view
Rayalaseema is dry. Rainfall is low and unreliable, groundwater is deep and falling, and the rigs that chase it drill 600, 800 and 1,000 feet through granite and limestone. That single fact drives the largest share of our Kurnool work: rig compressors and boosters, their service, their spares, and the sizing arithmetic that decides whether a rig can finish a hole. Around it sits heavy industry: limestone quarrying and cement manufacture along the Nandyal–Banaganapalle–Dhone belt, slab-stone and granite quarrying, the Orvakal industrial hub with its pharmaceutical, chemical and engineering plants and its airport-area logistics, and the seed, cotton and oil-milling economy of Adoni, Yemmiganur and Nandyal. Kurnool town itself has workshops, hospitals, colleges and construction. The heat is severe: Kurnool’s May highs are among the highest in the state, and every compressor here is specified with a summer margin.
| Area | Approximate road distance from Tarnaka | Typical route | What we are usually asked for there |
|---|---|---|---|
| Kurnool town and Orvakal | 205–225 km | NH 44 | Industrial-hub plants, workshops, hospitals, construction, rigs |
| Dhone and Banaganapalle | 240–270 km | Via Kurnool | Limestone and slab-stone quarries, cement, drilling |
| Nandyal and Allagadda | 260–290 km | Via Kurnool | Cement plants and contractors, seed and oil processing, rigs |
| Adoni and Yemmiganur | 250–280 km | NH 44 then west | Cotton ginning, seed processing, oil mills, rigs |
| Towards Anantapur and Kadapa | 280–350 km | NH 44 / NH 40 | Drilling, quarries, cement, horticulture processing |
Deep borewells: The duty that defines Rayalaseema
A rig working the Kurnool uplands is asked for depth that rigs elsewhere never see, and the compressor must be chosen for it. The hammer’s maker specifies a pressure and flow for the hole size; the water column the hole makes at depth takes a share of the compressor’s pressure before the hammer sees any; the engine and the airend both derate in 44 °C heat; and the flow must be enough to lift cuttings and water out of the annulus at a velocity that keeps the hole clean. The DTH drilling guide and the booster-assisted drilling page set out the method, and the annular velocity tool gives the flow check.
| Hole and depth | What the hammer needs | What the water column takes | What the rig needs |
|---|---|---|---|
| 6.5 inch to 400 ft, modest water | About 17–20 bar g at the hammer | Small | A 25 bar g compressor with margin for heat |
| 6.5 inch to 700 ft, water standing 300 ft | About 20 bar g at the hammer | About 9 bar | A 25 bar g compressor is marginal; a 30–35 bar g machine or a booster is the answer |
| 6.5 inch to 1,000 ft, water standing 500 ft | About 20 bar g at the hammer | About 15 bar | A compressor and booster pair at 35 bar g and above, with the flow checked for annular velocity |
The commonest mistake in the district is to buy a rig compressor by its nameplate pressure and then find the hammer stalling at depth when the hole makes water; the second is to run a booster without checking that the base compressor’s flow is still enough to lift cuttings. We size the pair, we supply new rig compressors and boosters through our tie-ups, we supply inspected used rig compressors from our yard with their test sheets and a plain statement of their pressure margin, we service rig compressors and boosters of every make, and we supply the spares that rigs consume.
Cement, limestone and slab stone
The Nandyal–Banaganapalle–Dhone belt quarries limestone for cement and lime, and Banaganapalle and Dhone quarry the slab stone that paves much of the south. Quarry drilling is wagon drills and DTH hammers at 7 to 25 bar g in white, alkaline dust and open sun; the cement plants need contractor air for maintenance, blasting and painting, and standby or supplementary air to a written standard during outages. Intake filtration a grade heavier than the manual, intakes away from haul roads, cabinet filters and inspection-based cleaning intervals apply, and rental sets for plant work are specified against the plant’s requirement and commissioned on site against the acceptance checklist.
Orvakal and the industrial hub
The pharmaceutical, chemical and engineering plants at the Orvakal hub need instrument-quality and process air to written standards, with documented maintenance; we supply and commission against the specification, test the installed set, run maintenance contracts with records, and supply standby or rental sets during audits and expansions. The food-grade and oil-free air page explains the air-quality classes. The hub’s heat is the design condition: dryers are sized for a 45 °C inlet, compressor rooms have real outlets for hot air, and coolers are cleaned on an inspection calendar.
Seeds, cotton and oil mills
Seed processing around Kurnool, Nandyal and Adoni cleans, grades, treats and packs seed on pneumatic equipment that must see dry air; cotton ginning and pressing at Adoni and Yemmiganur runs presses and gates in a lint-laden atmosphere that blocks coolers; oil mills use air for pneumatic valves and packing. In each case the dryer, filtration, drains and intake placement decide the result, and we design them with the compressor.
Key facts for a Kurnool site
- Distance: about 210 km from Tarnaka to Kurnool by NH 44; Nandyal and Adoni 250–290 km. A planned visit or delivery is a day; Kurnool is the nearest Andhra district to Secunderabad.
- Climate: very hot and dry; May highs around 44 °C and heatwave days above that; a light, unreliable monsoon. Heat and dust are the design conditions, and every machine is specified with a summer margin.
- Groundwater: deep and falling; rigs drill to 1,000 feet and boosters are common.
- Dust: limestone dust in the cement belt, stone dust at quarries, lint at ginning units, red-soil dust at rig sites.
- What we do here: sales of new machines through our supply tie-ups, inspected used and refurbished machines from our Secunderabad yard, rental from our own fleet, service and repair of all makes, maintenance contracts, overhauls of airends, engines and boosters, spares, dryers and filters.
Sales: New, used and refurbished
A driller choosing between a 35 bar g machine and a compressor-plus-booster rig, a quarry contractor buying a drilling compressor, a hub plant specifying instrument air, a ginning unit replacing a worn piston machine: each is sized from the job. We have supply tie-ups with all major makes, we are not the authorised dealer of any, and we recommend from the duty and the environment; for rigs and quarry machines the comparison is on pressure margin, heat rating and specific fuel consumption, for plants on air quality and energy. The selection guide explains the method, and the used compressors page sets out what an inspected, load-tested refurbished machine from our yard comes with: a test sheet and a six-month warranty.
Rental in Kurnool and Rayalaseema
Kurnool’s closeness makes rental more flexible than in the coastal districts: a machine can be delivered, swapped or supplemented at short notice, planned with you. Our fleet supplies portable diesel compressors for drilling, quarry, construction and shutdown work, and skid-mounted electric screw compressors, with dryers and filtration, as standby or supplementary air for plants and processors. Machines arrive with hoses and a commissioning check; fuel for a diesel machine is the hirer’s. The own-or-hire calculator lets a contractor run the decision with their own hours and fuel figures, and in Rayalaseema’s heat the fuel figure deserves attention.
Service, repair and maintenance contracts
| Situation | What we need first | What then happens |
|---|---|---|
| Rig compressor or booster losing pressure, hammer stalling at depth | Nameplate, hours, gauge readings under load, hammer, hole depth and water level | A service engineer with filters, valves and instruments tests under load on site; often a sizing answer as much as a repair |
| Quarry compressor overheating | Nameplate, hours, photographs of the cooler and filters, gauge readings | A visit with cooler-cleaning equipment, filters and the likely thermostatic element or sensor |
| Plant air out of specification at the hub | Compressor, dryer and filter nameplates, the specification, recent results | Instruments on site to test dew point and oil content; the fix in the dryer, filters or drains |
| Overhaul, airend, engine or booster rebuild | Hours, noise and vibration history, oil analysis if available | The unit goes to our Secunderabad workshop; a rental or loan machine covers the site |
| Maintenance contract | Machine list with nameplates, hours, criticality, season dates | A visit calendar from hours and seasons, consumables carried, dryers and drains included, follow-up visits practical because of the distance |
For a hub plant a contract with records is the normal arrangement; for a quarry or a fleet of rigs it is what turns unplanned trips into planned ones. The AMC page explains the structure.
Spare parts to Kurnool
Intake filters, separator elements, oil, belts, inlet and minimum-pressure valves, thermostatic elements, booster valves and seals, hammer and hose fittings, dryer filters, drain valves and controller sensors are what the district consumes, and heat and dust shorten every interval. Parts travel with the service engineer for planned work or by road for a customer’s own fitter, planned with you. We identify a part from the nameplate and a photograph of the component, not from the canopy name; the spare parts page explains what to photograph. A drilling contractor should hold a season’s intake filters, belts, a thermostatic element and booster seals on site.
A worked example: A rig for 1,000-Foot bores near Dhone
A driller working around Dhone with a 6.5 inch hammer on a 25 bar g, 25 m³/min compressor finds the hammer stalling below about 650 feet when the hole stands 400 feet of water, and asks for a bigger compressor. The hammer wants about 20 bar g at its inlet; the 400 foot column takes about 12 bar; line and hammer losses take more; and the 25 bar g machine, derated in May heat, has nothing left. A larger compressor of the same pressure class would not help. The answer is a booster taking the 25 bar supply to 40 bar g for the deep sections, with the base machine’s 25 m³/min checked against the annular velocity needed to lift cuttings and water from a 6.5 inch hole around the drill pipe, which it passes with margin. We supply and commission the booster, set its unloading pressure for the hammer’s limit, service both machines under a contract with the intake filters changed on an inspection calendar, and the rig finishes the district’s deep holes without stalling.
Common mistakes at Kurnool sites
- Buying a rig compressor by nameplate pressure without counting the water column of a deep Rayalaseema bore.
- Asking for a bigger compressor when the answer is a booster.
- Running a booster without checking that the base compressor’s flow still lifts cuttings.
- Choosing a quarry compressor with no margin for a 44 °C bench and a dusty cooler.
- Sizing a hub plant’s dryer from the nominal flow at a cool inlet.
- Ordering a part by the canopy name rather than the number on the component.
How Reddy Compressors helps
Kurnool is the nearest Andhra district to Secunderabad and one where our deep-drilling and booster experience was built. We are an independent, multi-brand business with supply tie-ups across all major makes, our own rental fleet, our own yard of inspected used machines, a workshop for airend, engine and booster work, and more than 20 service engineers and technicians, all working from Tarnaka.
What to send us
- A photograph of the compressor nameplate and, for a fault, the gauges or controller under load.
- Where the site is: the quarry, plant, processing unit, village or landmark.
- For a rig: the hammer size, the usual hole depth, the water level you meet, and the compressor and booster on the rig.
- For a plant: the air-quality specification and the list of air users with hours.
- For rental: the duty, pressure, flow, air quality, period, and whether the site has three-phase power.
Frequently asked questions
Do you have a branch in Kurnool?
No. Our only office and yard is at Tarnaka, Secunderabad, about 210 km away by NH 44. Service engineers, rental machines and parts travel from there, and day visits are practical.
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My hammer stalls at depth. Do I need a bigger compressor?
Usually not; you need more pressure at the hammer, which a booster gives. Send the hammer size, depth and water level and we will size the pair and check the flow.
What pressure do I need for 1,000-Foot bores?
With a deep water column, well above 30 bar g at the compressor and often 40 bar g with a booster. The water column, not the depth alone, sets the figure.
Do you rent portable compressors for quarry and drilling work in the cement belt?
Yes, from our own fleet, delivered by road on a planned day, commissioned on site and hired by the month. Fuel is the hirer’s.
Can you supply audit-ready instrument air for a plant at Orvakal?
Yes. We supply and commission against a written air-quality specification, test the installed set against it, and run maintenance contracts with records.
Can you service a booster or compressor of a make you did not supply?
Yes. We service and repair every major make of compressor and booster and supply parts for them. Send the nameplates.
Is a used rig compressor sensible in Rayalaseema?
For a known depth, yes, provided its pressure margin is honest. Inspected used rig compressors from our yard come load-tested with a test sheet and a plain statement of the depth they suit.
Do you cover Anantapur and Kadapa from Kurnool?
Yes. Rigs, quarries, cement contractors and processors across Rayalaseema are served from Secunderabad by the same roads, with visits planned around the distance.
Related pages
Technical content reviewed by D. Srinivas Reddy, Managing Partner and service engineer, Reddy Compressors. Last updated 4 November 2026. How our engineering content is reviewed.