TL;DR — Direct answer: A brick and tile plant needs dust-tolerant air at 7 to 8 bar for pressing, kiln controls, glazing and packing, with a pressure dew point of 3 degrees C and filtration to 0.01 micron so no oil or water reaches a press valve or a kiln damper. Size on the coincident peak of pressing and packing, commonly 6 to 14 cubic metres per minute for a mid-size plant, and use a variable speed drive because presses and packing lines run in batches. QiAir, a Chinese screw compressor manufacturer and supplier, builds fixed and variable speed machines with heavy-duty intake filtration for brick and tile plants.
A brick and tile plant is a hot, dusty, heavy-duty environment, and the air system has to survive it. Clay is pressed into bricks and tiles, dried, fired in kilns at over 1,000 degrees C, glazed, sorted and packed, and compressed air sits behind most of it: it drives press valves and ejectors, feeds kiln damper and burner controls, powers glazing spray guns, runs sorting and packing lines, and operates the cleaning lances that keep the plant running. A pressure dip at the wrong moment can stall a press mid-cycle, leave a kiln damper short of its stroke, or stop a packing line, and on a line that turns out thousands of bricks an hour, a small stoppage compounds fast. QiAir is a Chinese manufacturer and supplier of screw air compressors, and its machines for brick and tile plants are specified around dust tolerance, heat tolerance and intake protection first and flow second.
The trap in brick and tile manufacturing is sizing air like a clean factory utility. Pressing is cyclical with sharp peaks at ejection, kilns run continuously, and packing peaks at the end of the shift when the day's output is boxed. The compressor must cover the coincident peak without sagging below 7 bar at the farthest press, and the intake must survive fine clay dust and the heat radiating from the kilns. This guide maps the air users on a brick and tile line, explains how to size for pressing and packing peaks, sets the dust standard that protects the compressor, and shows what to put on a sizing sheet for a China supplier.
Where Air Is Used: Pressing, Kilns, Glazing and Packing
Pressing is the heaviest user and the most cyclical. Hydraulic and pneumatic presses form clay into bricks and tiles, using air for valve actuation, mould ejection and cleaning, and the demand arrives in sharp bursts at the end of every press cycle, when several presses eject together. A pressing hall with four to ten presses can pull its peak in the first seconds after ejection, and a compressor sized on average flow will sag exactly then. Keep the pressure at the press within a narrow band, and fit a dedicated receiver near the pressing hall if the header run is long, because a local receiver is cheaper than upsizing the whole system.
Kilns, glazing and packing take the rest of the air. Kilns use it for damper control, burner-valve actuation and cooling-fan dampers, glazing lines need dry air for spray guns, and sorting and packing lines use it for clamps, conveyors and strapping. Kiln areas are hot, so air lines near the kiln need heat-resistant routing and the compressor room must stay cool and ventilated. A plant that maps every user, including the small air tools used for cleaning, usually finds 15 to 25 percent more demand than the original estimate, and that gap is where pressure problems start.
- Pressing: valve actuation, mould ejection and cleaning with sharp peaks at the end of every cycle.
- Kilns: damper control, burner valves and cooling-fan dampers that run continuously in high heat.
- Glazing and packing: spray guns, sorting, clamps and strapping that need dry air at stable pressure.
Sizing for Pressing Cycles and Packing Peaks
List every line with its flow at ejection and at steady running, because the two differ sharply in brick and tile work. A mid-size plant with four to ten presses, a tunnel kiln and two to four packing lines typically peaks at 6 to 14 cubic metres per minute at 7 to 8 bar, which is roughly a 45 to 90 kW screw compressor, and the peak usually lands when several presses eject together and the packing line is at full load. A variable speed drive earns its keep here: it follows the cyclical pattern instead of loading and unloading a fixed-speed machine dozens of times a shift, and it holds pressure within the narrow band that presses prefer.
Keep the pressure drop to the farthest press under 0.3 bar at peak flow, and fit a receiver of 500 to 1000 litres per 10 cubic metres per minute to absorb ejection spikes. A ring main helps when the pressing hall, kiln and packing shop sit in different wings of the building. Log pressure at the pressing hall during a full production run for a week, because that log is the honest record of whether the compressor is big enough, and it settles arguments faster than any catalogue figure. Never raise the set point to mask a sag: every extra bar adds roughly 7 percent to power use and hides the real fault, which is usually a clogged filter or an undersized pipe.
- Size on the ejection peak when several presses cycle together, not on steady-state average flow.
- Use a variable speed drive for cyclical pressing loads, and keep far-end pressure drop under 0.3 bar.
- Log pressing-hall pressure during production for a week to prove the sizing in real use.
Clay Dust, Kiln Heat and Compressor Protection
Clay dust is the defining problem of a brick and tile plant. It is fine, abrasive and everywhere, so the compressor intake must sit on the clean side of the building, away from the pressing hall and the raw-material intake, and ducted if necessary so the machine breathes relatively clean air. A standard intake filter clogs fast in a brick plant; fit a heavy-duty pre-filter or a cyclone separator upstream of the intake, check it weekly, keep a spare on the shelf, and watch the pressure drop across it, because a choked intake raises discharge temperature and power draw at the same time.
Kiln heat is the other half of the problem. A compressor room next to a tunnel kiln can reach 40 degrees C or more in summer, and a machine that breathes hot air loses capacity and runs hotter itself, so site the compressor room away from the kilns, ventilate it well, and duct cool intake air from outside if the room cannot be kept cool. Fit a refrigerated dryer to a 3 degree C pressure dew point with a coalescing filter to 0.01 micron, drain condensate with automatic zero-loss drains, and slope lines to drain legs so no moisture reaches a press valve or a kiln damper.
- Put the compressor intake on the clean side of the building, with a heavy-duty pre-filter or cyclone separator.
- Site the compressor room away from kilns, ventilate it well, and duct cool intake air from outside in summer.
- Check the intake filter weekly, keep a spare in stock, and watch pressure drop across it.
Buying from China: Sizing Sheet for a Brick and Tile Plant Compressor
QiAir is a Chinese manufacturer and supplier of screw air compressors, and a brick and tile order should start with a sizing sheet that names the dust level and the heat. Send the supplier the number of presses and packing lines, the coincident peak at 7 to 8 bar, the dust level and ambient temperature in the compressor room, and the distance to the farthest press. Ask for a quotation that states the intake filtration, dryer type and filter grades explicitly, and ask whether a heavy-duty intake pre-filter or a cyclone separator fits the dust load better, with the cost and maintenance difference spelled out.
Agree the acceptance test before shipment: a full-load run at rated pressure, a dew point reading at the dryer outlet, and a pressure reading at a simulated far-end load. On arrival, install on a level plinth with clear airflow around the cooler, connect the drains before the first run, and run a pressure survey at the farthest press during the first full production week. Keep a simple log of pressure, temperature and filter changes, and it will tell you months ahead when a service is due.
- Send the supplier press and packing line counts, coincident peak, dust level, ambient temperature and farthest-press distance.
- Ask for intake filtration, dryer type and filter grades in writing, and compare pre-filter against cyclone on total cost.
- Accept on a full-load test plus dew point and far-end pressure readings, then survey pressure again in week one.
Frequently asked questions
What size screw compressor does a brick and tile plant need?
A mid-size brick and tile plant with four to ten presses, a tunnel kiln and two to four packing lines typically needs 6 to 14 cubic metres per minute at 7 to 8 bar, roughly a 45 to 90 kW screw compressor. Size on the ejection peak when presses cycle together, add a 500 to 1000 litre receiver per 10 cubic metres per minute, and verify pressure at the farthest press under full load.
Why does clay dust damage compressors?
Clay dust is fine and abrasive, so a standard intake filter clogs fast and a choked intake raises discharge temperature and power draw. Put the intake on the clean side of the building, fit a heavy-duty pre-filter or cyclone separator, check it weekly, and keep the compressor room away from the kilns and well ventilated.
How do I keep kiln damper controls working in a brick plant?
Kiln dampers need dry air at stable pressure, so fit a pre-filter, refrigerated dryer to a 3 degree C pressure dew point and coalescing filter to 0.01 micron in series, keep far-end pressure drop under 0.3 bar, and route air lines away from kiln heat. A pressure dip or a drop of moisture can leave a damper short of its stroke and disturb the firing curve.
Related reading
- Single-Stage vs Two-Stage Screw Compressors: Which One a China Manufacturer Recommends
- Buying Screw Compressors from China: A Ranking Checklist for Choosing a Supplier
QiAir is a Chinese manufacturer and supplier of screw air compressors. If you are sourcing a screw compressor from China — for a factory, a food plant, a construction site or a new production line — contact QiAir for a sized quotation, documented performance data and export support.