Plant Engineering · Since 1972
Capacity curves · moisture correction · baghouse CFM · burner BTU · silo storage — the selection path procurement engineers walk before locking a continuous mix or batch plant class.
Define seasonal tonnage and peak daily t/h for highway or municipal mix.
Lock aggregate moisture design and cold-feed bin count against stockpile reality.
Size drum diameter and burner BTU for target mix temperature windows.
Select baghouse CFM and filter media for stack permit particulate loading.
Confirm silo storage and loadout lane geometry for truck cycle times.
Issue type-test pack: capacity curve, burner map, AS 4024 guarding list.
Procurement teams often reopen the continuous-versus-batch debate mid-tender. Continuous drum lines sustain higher output capacity (t/h) with fewer operators when the recipe is stable across a corridor week; tower batch plants still justify themselves when RAP percentage swings or five-plus mix codes rotate daily. Astec publishes both capacity curves with the same aggregate moisture derate table so the mechanical engineer of record can score the options against haul-road truck cycle time and stack permit particulate loading — not against brand slogans.
Limitation we disclose: at design moisture above 5%, continuous throughput must be derated before comparing brochure peak tons; batch plants absorb short moisture spikes with longer dry cycles but lose seasonal average t/h. Hydraulic system pressure on plant gates and silo valves is verified to working setpoints during commissioning; operating weight of portable modules is listed per transport package so bridge permits are not discovered after fabrication.
Share moisture design, peak t/h and stack permit limits — engineering returns a drum class shortlist with baghouse and burner notes.
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