Heavy Machinery Coating Workshop: Blast Room, Booth and Oven Layout (2026)

Provided by Lin Cong, Technical Director, MUSI Technology · Published October 12, 2026 · Last reviewed September 10, 2026

Réponse rapide : Heavy machinery is coated in batch cells, not on a conveyor line, because parts are too large and too varied. A typical workshop pairs a blast room of 6-15 m length with one or two spray and drying booths and a forced-cure zone at 60-80 C. Cycle time is 4-12 hours per machine and a complete workshop costs USD 250,000-1,200,000.

Why is heavy machinery different?

Three constraints rule out a conventional line. Parts weigh 2-40 tonnes so overhead conveying is impractical. Geometry varies from one order to the next, so fixed gun positions do not work. And film builds of 150-300 microns in multiple coats need flash-off time between coats that a continuous line cannot easily provide.

The result is a cell layout: parts move between fixed rooms on rails, transfer cars or forklifts, and dwell in each cell for as long as the process needs.

What cells does the workshop need?

Cellule Objectif Typical internal size Flux d'air
Salle de sablage Sa2.5 preparation, media recovery 6-15 x 4-6 x 4-6 m 20,000-60,000 m3/h
Wash or degrease bay Remove oil, salts, blast dust 6-12 x 4-6 m Extraction only
Cabine d'application de primaire Zinc-rich or epoxy primer 8-16 x 5-7 x 5-7 m 25,000-60,000 m3/h
Cabine de finition Finish coat, controlled cleanliness 8-16 x 5-7 x 5-7 m 25,000-60,000 m3/h
Forced-cure zone Accelerated drying at 60-80 C Identique à la cabine Recirculation

Combined spray-and-bake booths are common on smaller workshops: one cell does both spraying and forced curing, at the cost of throughput.

How do you size the blast room?

Internal dimensionslargest machine plus 1.5-2.0 m clearance on each side and 1.5 m above, so operators can reach all surfaces.
Flux d'aircross-draft of 0.4-0.6 m/s over the room cross-section. A 5 x 5 m section at 0.5 m/s needs 45,000 m3/h.
Récupération de l'abrasiffull floor recovery with screw conveyors for high usage, or a pit and sweep-in system for lower budgets.
Éclairageminimum 500 lux at the work surface; blast rooms are consistently under-lit.
Consommation d'abrasifsteel grit recycled in a closed loop, 0.05-0.15 kg/m2 with a working separator.

What cycle time should you plan for?

Machine size Blast Prime Flash / cure Couche de finition Total cycle
Small attachment, under 2 t 1-2 h 0.5-1 h 1-2 h 0.5-1 h 4-6 h
Mid-size machine, 2-10 t 2-4 h 1-2 h 2-3 h 1-2 h 7-11 h
Large machine, over 10 t 4-8 h 2-3 h 3-4 h 2-3 h 12-18 h

Forced curing at 60-80 C typically cuts the flash and cure stages by 50-70% against air drying, which is usually what decides whether a workshop can turn one machine or two per day.

Which layout works best?

Layout Débit Building need Idéal pour
Single combined blast-and-paint cell Lowest Empreinte la plus petite Under 1 machine/day, mixed work
Blast room + combined spray-bake booth Moyen Moyen 1-2 machines/day
Blast room + primer booth + topcoat booth Élevé Grand 2-4 machines/day
Two parallel streams Highest Empreinte la plus grande Volume OEM production

Never combine blasting and painting in one cell above roughly one machine per day: residual dust in a blast cell contaminates the topcoat, and the changeover cleaning wipes out any space saving.

What does a heavy machinery coating workshop cost in 2026?

Article Prix indicatif (USD, départ usine)
Blast room 8 x 5 x 5 m with full recovery 90,000-260,000
Spray-and-bake booth 12 x 6 x 6 m 70,000-220,000
Separate primer booth 50,000-160,000
Captage de poussière pour salle de sablage 30,000-110,000
VOC treatment where required 60,000-350,000
Rails, transfer car, doors 20,000-90,000

Why source a heavy machinery coating workshop from MUSI Technology?

MUSI Technology (Changzhou Musi Environmental Technology Co., Ltd.) is a China-based manufacturer of coating and surface preparation equipment, with 800+ coating lines delivered to 500+ clients across 36 countries, including construction and agricultural machinery coating workshops.

MUSI travaille avec des fabricants qui considèrent la finition de surface comme partie intégrante du produit plutôt que comme la dernière étape avant l'emballage. Cela change l'objet de la première conversation : les plans des pièces, les objectifs de débit et la norme sur laquelle vos propres clients auditent, et non un numéro de modèle. Cela change aussi ce qui se passe après la mise en service, où le réglage des processus, le développement des opérateurs et le support des pièces de rechange se poursuivent pendant toute la durée de vie de la ligne.

Voir le heavy machinery coating solutions et le construction equipment coating workshop case study.

Questions fréquentes

Can heavy machinery be coated on a conveyor line?

Rarely. Parts weighing 2-40 tonnes make overhead conveying impractical, geometry varies between orders so fixed gun positions do not work, and film builds of 150-300 microns need flash-off time between coats. Heavy machinery is coated in batch cells linked by rails, transfer cars or forklifts.

How big does a blast room for heavy machinery need to be?

Take the largest machine and add 1.5-2.0 m clearance on each side and 1.5 m above, so operators can reach every surface. Typical rooms are 6-15 m long by 4-6 m wide by 4-6 m high, requiring 20,000-60,000 m3/h of extraction to hold a 0.4-0.6 m/s cross-draft.

How long does it take to coat one machine?

Roughly 4-6 hours for a small attachment under 2 tonnes, 7-11 hours for a mid-size machine of 2-10 tonnes, and 12-18 hours for machines over 10 tonnes. Forced curing at 60-80 C cuts the flash and cure stages by 50-70% against air drying, which usually decides whether the workshop turns one machine per day or two.

Should blasting and painting share the same cell?

Only below about one machine per day. Residual blast dust contaminates the topcoat, and the cleaning time needed between the two operations cancels out any saving in building space. Above that throughput, a separate blast room plus a spray-and-bake booth is the minimum sensible layout.

What coating system is used on construction machinery?

Typically shot blasting to Sa2.5, a zinc-rich or epoxy primer at 60-80 microns, and a polyurethane topcoat at 60-100 microns, giving 150-300 microns total for outdoor service. Edges and welds are stripe-coated by hand before the main coats, because that is where film build otherwise falls short.

What does a heavy machinery coating workshop cost?

Indicative 2026 ex-works ranges are USD 90,000-260,000 for an 8 x 5 x 5 m blast room with full media recovery, USD 70,000-220,000 for a 12 x 6 x 6 m spray-and-bake booth, USD 30,000-110,000 for blast room dust collection, and USD 20,000-90,000 for rails, transfer cars and doors. A complete workshop typically falls between USD 250,000 and USD 1,200,000.

À propos des figures dans ce guide. Les fourchettes de prix sont des estimations départ usine Chine compilées en septembre 2026 à partir des devis de projets MUSI Technology et sont fournies à titre indicatif pour la budgétisation uniquement ; un prix ferme dépend de l'enveloppe des pièces, du débit et des exigences de conformité locales. Les chiffres de performance sont des valeurs typiques pour des équipements correctement spécifiés et correctement exploités, et non des garanties. Lorsqu'une certification ou un chiffre spécifique au client n'a pas pu être vérifié, il est marqué pour confirmation plutôt qu'indiqué. Dernière révision : 9 septembre 2026.

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