Neometrix / Surface Preparation & Precision Cleaning Systems / Vapour Degreasing & Blast Cleaning Line / NMX-VDB-29

NMX-VDB-29 · ENGINEERED-TO-ORDER CLASS — SOLVENT FIRST · PRESSURE BLAST · FLAMEPROOF LINE

Vapour Degreasing & Blast Cleaning Line. You cannot blast oil off. You can only blast it in.

Name: Vapour Degreasing & Blast Cleaning Line
SKU: NMX-VDB-29

Abrasive blasting does not remove oil and grease. It smears them into the roughened surface and contaminates the abrasive that is recycled for the next part.

So the solvent stage comes first, the blast stage second, and the hand-off to coating third. In this line, the order is the product.

Discuss a cleaning line Capability note (PDF)

An open-top vapour degreasing station with cooling coils around the inside of the rim and a hinged lid stood open, with a large plain flanged cylindrical steel component lifted clear above the tank on two slings, and no people

Fig · 01 — A vapour degreasing station with a large cylindrical component lifted clear above it — illustrative render.

The first stage

solvent vapourdegrease before you blast

The second stage

pressure blastabrasive recovered, dust captured

The handling

rotator or manipulatorfor large components

The safety basis

flameproofdesigned as a hazardous area

Status

engineered to orderno unit yet delivered

ISO 9001ISO 14001SSPC-SP 1 solvent cleaning referenceISO 8501-1 cleanliness referenceIEC 60079 hazardous-area reference

Overview

Why the cleaning line's order matters more than either machine in it.

Because a perfect blast station in the wrong place in the sequence makes the surface worse, not better.

Fig · 02 — The line in one picture: solvent degreasing first, pressure blasting second, dust-off and hand-off last, with the solvent still and the abrasive recovery behind them.

A blast station cleans a clean surface. On an oily one, it only spreads the oil further.

What the line is actually for

It takes large cylindrical components to a surface that a coating or an adhesive will actually hold to: free of oil and grease, free of scale, and with a clean, even profile.

Why degreasing has to come first

Blasting drives oil and grease into the roughened surface, where a coating cannot bond to it, and coats the recycled abrasive in oil so that it contaminates every part after it. That is why solvent cleaning is specified before blast cleaning, not after.

Why vapour, not a dip tank

A dip tank gets dirtier with every part it cleans. In a vapour degreaser the clean solvent condenses on the part, dissolves the oil and runs back to the sump, so the last thing to touch every part is freshly distilled solvent, and it emerges dry.

Why large parts need a rotator or manipulator

A large cylinder cannot be cleaned evenly by a person walking around it. Presenting the part to the process with a rotator or manipulator makes coverage even and repeatable, and keeps the operator out of the blast zone.

Why the line's clock starts at the blast

A freshly blasted surface is at its cleanest and its most fragile. In humid air it can begin to rust within hours, so the line hands it on to coating quickly and in dry air, not after a wait.

Why the whole line is designed as a flameproof installation

Where the solvent is flammable, its vapour turns the degreasing area into a classified hazardous area. The electrics, the ventilation and the interlocks are designed for it from the start, not fitted afterwards.

The cycle

Load, degrease, dry, blast, dust-off, and hand on.

Six steps, and the two that transform the surface are the solvent stage and the blast stage, in that order and never the other way round.

FIG · 02VAPOUR DEGREASING & BLAST CLEANING LINE · LOAD / DEGREASE / DRY / BLAST / DUST-OFF / HAND ON — SOLVENT FIRST, THEN BLAST

The step people underrate is the hand-off. A perfectly cleaned surface starts losing its quality the moment the blast stops.

Fig · 03 — The same surface, three states: oily as received, clean after the solvent stage, and clean with an even profile after the blast — a drawing of the idea, with no values.

1 · Load

The component is set on its carrier or rotator, and the line's sequence is started from the control system.

2 · Degrease

Clean solvent vapour condenses on the component and carries the oil and grease away, so the surface is finished with fresh distillate.

3 · Dry

The component is lifted clear through the cooling coils, so it emerges dry and the solvent is recaptured, not lost.

4 · Blast

A pressure-blast station cleans and profiles the surface, with the part presented by a rotator or manipulator and the abrasive recovered.

5 · Dust-off

Dust is extracted and the surface is cleared and inspected before it leaves the enclosure.

6 · Hand on

The prepared component is handed on to coating quickly, in dry air, before the surface begins to deteriorate.

Work content

What the line contains, element by element.

Read it as a checklist: a line missing a row will buy that row back later, usually the first time a coating lifts and nobody can say why.

A large plain flanged cylindrical steel component lying horizontally on a powered roller rotator with two pairs of rubber-tyred rollers on a low steel base, and no people

Fig · 04 — A large cylindrical component on a powered roller rotator, ready to be presented to a process station — illustrative render.

Element	What it does	What matters
Vapour degreasing station	cleans with condensing solvent vapour	parts are rinsed by fresh distillate and emerge dry
Boil sump & heating	generates the solvent vapour	keeps the vapour zone stable
Condensing & freeboard coils	hold the vapour in and recapture solvent	keeps the solvent in the machine, not the room
Solvent recovery still	separates solvent from the oils by distillation	cleaner solvent and less waste
Pressure-blast station	cleans and profiles the surface	a nozzle or lance matched to the component
Blast pots & nozzles	meter abrasive into the air stream	a consistent profile from end to end
Component rotator or manipulator	presents large parts to the process	even, repeatable coverage, and the operator kept clear
Abrasive recovery & recycling	reclaims and cleans the abrasive	protected from oil by the degrease-first order
Dust collection	captures blast dust by cartridge filtration	clean air, and a clean surface at the end
Fume extraction & ventilation	keeps solvent vapour out of the work zone	sized for the solvent and the enclosure
Flameproof electrics & interlocks	protect against flammable vapour	designed to the classified hazardous area
Dry compressed-air supply	feeds the blast and the clean-up	dry air, so the fresh surface stays dry
Control system & HMI	sequences the stations and logs the run	the order cannot be skipped or reversed
Instrumentation & power control	measure temperature, pressure, flow and level	confirm the vapour zone, the air and the recovery
Testing & documentation	proves the line before handover	cleanliness and profile checks, with records

The row that decides whether the coating holds, not just whether the line runs, is never a machine. It is the control system. A perfect degreaser and a perfect blast station on a line that lets the order be reversed will, sooner or later, be run in the wrong order.

Fig · 05 — One line, three support systems: solvent recovery, abrasive recovery with dust collection, and dry compressed air.

Full specification — expand

System	A vapour degreasing station with boil sump, condensing and freeboard coils and a solvent recovery still; a pressure-blast station with blast pots, nozzles or lances; a component rotator or manipulator; abrasive recovery and dust collection; fume extraction and ventilation; flameproof electrics and safety interlocks; a dry compressed-air supply; a PLC control system with instrumentation; and testing and documentation before handover
The One Idea	You cannot blast oil off. You can only blast it in, so the solvent stage comes first and the order of the line is the product
Why Degrease First	Abrasive blasting smears oil and grease into the roughened surface and contaminates the recycled abrasive, which is why solvent cleaning is specified before blast cleaning
Why Vapour	In a vapour degreaser the part is rinsed by freshly distilled solvent condensing on it and emerges dry, so the last thing to touch the part is always clean solvent, unlike a dip tank that gets dirtier with every part
Why Flameproof	Where the solvent is flammable, its vapour makes the installation a classified hazardous area, so the electrics, ventilation and interlocks are designed for it from the start
Standards	SSPC-SP 1 for solvent cleaning ahead of blast cleaning, ISO 8501-1 for the visual cleanliness of the prepared steel, and the IEC 60079 series for equipment in hazardous areas are the public references this class is designed against. Acceptance of the finished line rests with the customer and their inspection authority
Configurations	A degreasing cell, a two-station line, and an integrated, interlocked line with a rotator and shared controls
Scope Boundary	This is a line built around solvent vapour degreasing ahead of a pressure-blast station. It is not a wheel-blast or shot-peening machine (see shot blasting and peening system) and not an aqueous hot-wash bay (see chemical cleaning bay)
Status	Neometrix engineers vapour degreasing and blast cleaning lines for large components to order, and no delivered vapour degreasing or blast cleaning line is claimed.

Configurations

One sequence discipline, three ways to build the line.

The solvent stage, the safety basis and the order of operations are shared. What changes is how many stations there are and how they are linked.

Degreasing cell

Solvent stage alone

The vapour degreasing station with its recovery still and flameproof design, for components that feed a separate process.

Two-station line

Degrease, then blast

A vapour degreasing station and a pressure-blast station, with the component moved from one to the next under a defined procedure.

Integrated line

Interlocked, with a rotator

Both stations, a rotator or manipulator, shared controls and interlocks, so the order cannot be skipped or reversed.

Fig · 06 — Three ways to build the line, one sequence discipline: a degreasing cell, a two-station line, or an integrated, interlocked line.

And the part that is not a station at all, yet decides all three: the hand-off procedure — the defined, timed step that moves a freshly cleaned component on to coating before its surface starts to lose quality.

Where it is used

Wherever a large component has to be clean before something is bonded to it.

The common thread is a surface that a coating, a lining or an adhesive has to hold to, and cannot if a trace of oil is left under it.

Ahead of coating & lining

Where a protective coating has to bond to bare steel, not to a film of oil on it.

Ahead of adhesive bonding

Where a joint is only as good as the cleanliness of the two surfaces it joins.

After machining, before preservation

Where cutting oils and coolants have to come off before a part is protected or stored.

Reworked & returned components

Where a component comes back oily and in an unknown state, and has to be brought back to a known one.

FAQ

Common questions.

Longer answers, for readers who want the reasoning.

Q · 01 Why can't abrasive blasting remove oil and grease by itself?

Because blasting is a mechanical process, and oil is not a mechanical problem. Abrasive particles strike the surface and remove scale, rust and old coating by impact, but a film of oil or grease is not knocked off that way - it is spread across the surface and pressed into the very profile the blast is creating. That profile is what a coating or adhesive is meant to grip, so oil trapped in it sits exactly where the bond has to form, and the coating fails there, often months later and for no visible reason. The oil also does damage on its way through the machine: in a system that recycles its abrasive, oil coats the grit, which then carries the contamination onto every part that follows and clogs the recovery equipment. This is why the recognised practice, and the reason a solvent cleaning standard exists, is to remove the oil and grease first and blast second. It is also why this line is built in that order and, in its interlocked form, will not run the other way round.

Q · 02 Why vapour degreasing rather than a solvent dip tank or a wipe?

Because a vapour degreaser always finishes a part with clean solvent, and a dip tank does not. In a dip tank, every part is cleaned in the same liquid, and that liquid carries away more oil with every part until it is itself the contamination. In a vapour degreaser, solvent is boiled in a sump and its vapour rises into a zone held in place by cooling coils. A part lowered into that vapour is colder than the vapour, so clean solvent condenses on it, dissolves the oil, and runs off into the sump. The liquid that touches the part is always freshly distilled condensate, never the dirty sump liquid. As the part is lifted through the cooling coils it emerges dry, and the solvent that would have evaporated into the room is recaptured. The same machine can double as a recovery still, separating the solvent from the oils it has collected so that the solvent can be reused, which keeps the solvent in the equipment and the waste small. A wipe cannot promise any of this, and cannot reach the whole surface of a large component evenly.

Q · 03 Why does the line need to be designed as a flameproof installation?

Because where the solvent is flammable, the space around the degreasing station is a place where a spark could ignite vapour, and equipment there has to be chosen and installed accordingly. Recognised practice is to classify the area according to how likely a flammable atmosphere is to be present, and to select electrical equipment, ventilation and interlocks that match that classification. The IEC 60079 series is the public reference for equipment in such areas. The important word is designed: retrofitting flameproof protection onto a line that was laid out without it usually means moving equipment, adding ventilation and rewiring, which costs more than doing it from the start. Not every solvent is flammable, and the right solvent depends on the contamination, the material and the environmental rules of the site, so the choice is made with the customer at design review. The point of stating it here is that the safety basis is decided first, and the layout follows from it.

Q · 04 How long can a blasted surface wait before it is coated?

Not long, and less in humid air. A freshly blasted steel surface is bare, chemically active metal, and it starts to rust as soon as moisture reaches it. In mild, dry conditions the accepted practice is to blast and coat on the same day, and in humid air a light rust film can begin within hours. Dust from the blast and the touch of a hand or glove also start to degrade the surface as soon as the blast is finished. That is why this line treats the hand-off as part of the process and not as something that happens afterward: dust is extracted and the surface cleared before it leaves the enclosure, the compressed air used for the clean-up is dry, and the component is passed on to coating under a defined procedure. This page states no exact window, because the right one depends on the steel, the site climate and the coating system, and belongs on the customer's own specification.

Q · 05 Is this the same as the shot blasting and peening page, or the chemical cleaning bay?

No, and the differences are worth stating precisely. The shot blasting and peening system page describes wheel-blast and air-blast rooms, cabinets and cells that prepare surfaces and peen them for fatigue life - it is about the blasting machine itself, and it says nothing about solvent. The chemical cleaning bay is an aqueous hot-wash bay, which cleans with heated water-based chemistry rather than a closed-loop solvent. This page describes a different thing: a line built around a solvent vapour degreasing stage that must come first, followed by a pressure-blast station, with handling for large components, a solvent recovery still and a flameproof design. The blast station in this line is the same class of equipment as on the shot blasting page and is not claimed a second time here; what is new is the solvent stage, the order of operations and the safety basis that goes with them.

Q · 06 Has Neometrix built one of these?

We would rather answer this plainly than let a page imply otherwise. Neometrix engineers vapour degreasing and blast cleaning lines for large components to order, and no delivered vapour degreasing or blast cleaning line is claimed. What stands behind the offer is adjacent: Neometrix engineers the neighbouring pieces this line is made of, including blast rooms with abrasive recovery and dust collection (see the shot blasting and peening system page), hot chemical cleaning bays (see the chemical cleaning bay page), and the compressed-air and control engineering that ties them together. So the honest position is this: the line is engineered to order, the neighbouring disciplines are in the building, and the first line of this exact type will be built around a customer's components, solvent and throughput rather than lifted off a shelf.

Q · 07 Which standards apply, and who decides how clean is clean enough?

SSPC-SP 1 is the public reference for solvent cleaning of oil and grease ahead of blast cleaning. ISO 8501-1 is the public reference for describing the visual cleanliness of prepared steel, and the IEC 60079 series is the public reference for equipment in hazardous areas. None of them, on its own, sets the cleanliness grade, the surface profile or the solvent for a specific job: those come from the coating or adhesive system being applied and from the customer's own specification, and they are not printed generically on a page like this one. Acceptance of the finished line, including any cleanliness and profile checks before handover, rests with the customer and whatever inspection authority they name.

Q · 08 What do you need from us to quote?

Six things, and most of them describe the components and the coating that follows. First, the components: their general form, material and the largest size the line must take. Second, the contamination to be removed: what oils, greases or compounds are on the parts as they arrive. Third, the surface requirement that the coating or adhesive system sets after cleaning. Fourth, the solvent position: whether the customer has a preferred solvent or rules that restrict one, so the safety basis can be set early. Fifth, the throughput and configuration: a degreasing cell, a two-station line or a fully interlocked line, and how many components over what period. Sixth, the site: the space, the utilities and any hazardous-area rules that apply. From that we come back with a system definition you can check, a station and layout drawing, and a budgetary price.

The other surface preparation and cleaning systems, and how they differ from this one.

Three neighbours in the same surface-preparation and corrosion-protection family.

↗ The blasting machine itself

Shot Blasting & Peening System

Wheel-blast and air-blast rooms and cells for surface preparation and peening - no solvent stage.

↗ The aqueous alternative

Chemical Cleaning Bay

A hot chemical wash bay - water-based cleaning rather than a closed-loop solvent.

↗ Proving the surface worked

Salt Spray & Corrosion Test Chamber

The test that shows whether a coating held to the surface this line prepared.

Browse all Neometrix product lines.

Get a quotation

Tell us the components, the oil,
and what has to hold to the surface.

The projects desk replies within two working days with a system definition you can check, a station and layout drawing, and a budgetary quotation. Write to [email protected] or use the form.

Enquire — cleaning line Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED-TO-ORDER CLASS — VAPOUR DEGREASING & BLAST CLEANING LINE LOAD · DEGREASE · DRY · BLAST · DUST-OFF · HAND ON — SOLVENT FIRST, THEN BLAST ENGINEERED IN NOIDA · INDIA