Trelawny PPT Peening Preparation Tool
PPT - shrouded drum housing and vacuum port
The PPT takes steel back to bare metal and leaves an anchor profile behind it, using abrasive that stays attached to the tool. No blast pot, no containment, no spent media to recover. Two cutting widths, 50 mm and 100 mm, in compressed air or 230 V electric, all of them fully shrouded (TVS®) for extraction.
It is a flat-surface tool. Decks, tank walls, girders, hatch covers, bridge steel and factory floors are what it is for. Welds, corners and stiffeners are not.
✓SepcoTech is an authorised Trelawny distributor
Captive shot, two rollers and a shroud
Every figure on this page lives somewhere on the tool. Hover or tap a number to trace it to the hardware.
- 01ShroudTVS® shroudTwo height settings: upper slot for flaps, lower for cutters. With the rollers it sets the 55 mm wall distance.
- 02C-flapsCaptive shot3M™ Rotopeen™ C-flaps carry tungsten carbide shot bonded to the strap. Anchor profile up to 100 µm, as stated by Trelawny.
- 03RollersTwo rollersThey ride the surface and set the strike height: both down with C-flaps, only the rear with cutters.
- 04Extraction port40 mmFor an industrial dust collector of at least 2,000 W. Extraction also keeps the flaps from overheating.
- 05Air motor2,700 rpmNeeds 30 cfm at 6.2 bar. The 230 V electric version runs at 2,000 rpm.
- 06Hub50 or 100 mmTwo cutting widths. Swap C-flaps, star or beam cutters with one bolt and a spanner.
Build your PPT in three choices
Width, power and abrasive give you one exact Trelawny part number. We then list what the tool needs to run properly, so your quote arrives complete.
Already know your part number?
Skip the builder and order straight from the full list. Every model, cutter, hub and spare, with its Trelawny part number.
Authorised Trelawny distributor
The tool, its warranty and its documentation are Trelawny's; the EUR quote with no hidden import costs, the consumables and the support in your time zone are ours. Genuine parts only - Trelawny's warranty does not survive non-genuine consumables.
Why It's Specified
What the PPT does that a grinder, a needle scaler or a blast pot does not.
The abrasive stays on the tool
Carbide shot is bonded to the flap, so there is no spent media to collect. That is why it is used where blasting is ruled out: lead paint, nuclear, over water, live plant.
A profile you can measure
Trelawny's stated anchor profile with C-flaps, against the 25 µm minimum in SSPC-SP 11. SP 11 is judged on the measured profile, not the look.
It covers area
Trelawny's figure on flat steel. A rotary bristle tool does about 1–3 m²/h on its maker's figures. On a deck or tank wall, that is the working day.
Shrouded as standard
A 40 mm port takes an industrial dust collector. On lead paint it makes the job permissible; on any steel it stops the flaps overheating.
Choosing and Running the Media
A drum or hub strikes the surface, fractures the coating and drives a profile into the steel. Swap the media with one bolt and the tool changes character.
| 3M™ Rotopeen™ C-flapsGeneral paint and rust | Star cuttersThick coatings, heavy rust | Beam cuttersHard coatings | |
|---|---|---|---|
| Finish | Near-white metal, up to 100 µm profile | Fast removal, visible marking | Less aggressive, slight marking |
| Over weld seams | No Tears flaps and voids the warranty | Yes | Yes |
| Rollers on the surface | Both, before you start and throughout | Rear roller only | |
| Starting | Rollers down, then start | Up to speed clear of the surface, then lower the drum | |
| Shroud setting | Upper slot | Lower slot | |
Lifting a roller with C-flaps fitted changes the strike height and wears the flaps fast. The wrong shroud slot does the same.
Set-up Checklist
The tool alone won't do the job. Get these right before the first morning on site.
Air supply
- Flow
- 30 cfm at 6.2 bar
- Working range
- 5.5–6.9 bar
- Hose bore
- 13 mm minimum
- Hose run
- 30 m maximum
Every extra 15 m of hose costs about 0.21 bar. Outside the range, tips and flaps wear early.
Electric supply
- 230 V
- 13 A minimum
- Cable
- 2.5 mm², 30 m max
- 110 V
- 3.0 kVA centre-tap
- 110 V supply
- 16 A
On 110 V, plug nothing else into the transformer input.
Lubrication
- Lubricator
- Within 3 m of tool
- Daily
- A few drops in the inlet
- Oil
- Zinc-free air tool oil
For example Shell S22 or R10, or Castrol Hyspin ZZ32.
Add a lubricator in the builder ↑Extraction
- Collector
- 2,000 W minimum
- Port
- 40 mm
Too little flow and the flaps melt around the carbide tips. Extraction cools as much as it cleans. The K-series KAV30 is ATEX-approved for gas zone 1 and dust zone 21.
Add a collector in the builder ↑Vibration (HAVS)
3.1–7.8 m/s²Declared, by variant and mediaThis figure sets trigger time per operator, and it is the number your client's HSE officer will ask for. Plan exposure before the job starts.
Exposure calculator in our HAVS guide →Where It Doesn't Fit
Not faults, just what a rotary scarifier is. Cheaper to know before the order than on day two.
Weld seams with C-flaps
Bolts, rivets, seams and edges tear the flaps and damage the tips. That damage isn't covered by warranty.
The last 55 mm to a wall
The shroud and rollers set that distance on every variant. Corners, stiffeners, brackets and penetrations are out of reach.
Visible or thin steel with cutters
Star cutters leave visible marks; beam cutters leave slight marks. A consistent near-blast finish can take more than one device.
PPT: Common Questions
Does the PPT meet SSPC-SP 11?
SP 11 requires bare metal with no staining and a minimum 25 µm anchor profile, assessed against the SSPC-VIS 3 pictorial standard. Trelawny states the Rotopeen C-flaps produce a profile of up to 100 µm, well above the minimum. Whether a given job meets SP 11 depends on the operator, the substrate and the inspection - measure the profile with replica tape or a depth micrometer rather than judging it by eye, and check the coating manufacturer's data sheet, which may only require SP 3.
What size compressor does the 4" PPT need?
30 cfm (840 l/min, about 14 l/s) at 6.2 bar, the same as the 2". Allow headroom: the tool needs to hold 6.2 bar at the inlet, and a 30 m hose at 13 mm bore already costs you pressure. Trelawny's web page lists this figure as "30 l/s (840 cfm)", which is a units error in their table.
Can it prepare surfaces for coating without any dust extraction?
It should not be run that way. The manual names poor vacuum flow as the cause of flaps burning and melting around the carbide tips, so extraction protects the consumables as well as the operator. On lead-based paint or contaminated coatings, an extraction system with HEPA filtration is a legal requirement in most jurisdictions, not a preference.
Air or electric?
Air, if you have 30 cfm. The air head is lighter, runs at 2,700 rpm against 2,000 rpm, and has less to go wrong in a wet environment. Electric, if you are working inside a building with no compressor - bearing in mind the 110 V version needs a 3.0 kVA transformer and a 16 A supply, which is not a domestic socket.
Can the PPT be used on weld seams?
With cutters fitted, yes. Trelawny list peening and slag removal from weld seams as an application. With Rotopeen C-flaps, no. The manual is explicit that running C-flaps over bolts, rivets, weld seams or the edge of the work surface tears the flaps, damages the carbide tips and creates a dangerous working condition, and that the damage is not covered by warranty. If your scope is mostly seams, a needle scaler or a bristle tool is the better buy.
How close to a wall can the PPT work?
55 mm. The shroud and rollers set that working distance, and it is the same on all four variants. Corners, stiffeners, brackets and pipe penetrations need a second tool, such as a needle scaler, a bristle tool or hand preparation. If the whole area has to meet one grade, the specification has to allow for it being finished by more than one method.
How long do the flaps last?
A US reseller of the equivalent 3M flap quotes roughly 40 hours; Trelawny does not publish a figure. Real life depends on four things the manual lists: both rollers kept in contact, correct air pressure, correct shroud height, and flaps fitted the right way round. Get those wrong and the flaps are the expensive part of owning the tool.
Is there an ATEX version?
Not of the PPT itself. The KAV30 dust collector that pairs with it is ATEX-approved for gas zone 1 and dust zone 21. For hazardous areas, ask us - the right answer may be a different tool in the Trelawny ATEX range.
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