The most flexible form factor for bespoke wastewater pilot trials. Modular skids on welded steel frames, sized to the worst-case leg of the transport chain — helicopter sling, 4×4 trailer, light-truck flatbed, ATV sled. Bolted together on site, reconfigured mid-campaign as the trial question evolves.
A Practical Decision Driven by the Transport Chain
Skid-mounted pilots earn their premium where the last leg of the transport chain is the constraint. A trailer or container needs a road; a skid needs only a level pad and a way to lift it into position. Helicopter sling, 4×4-towed trailer, light truck on a forest track, sled on a glacier, even a porter team into a national park — all become tractable transport options once the heaviest single piece in the pilot fits inside that envelope.
Decomposing a complete treatment train into skids that each meet the worst-case lift turns an impossible logistics problem into a manageable one. The pilot is then bolted together on site over 1–3 days and wet-commissioned on day 4.
Why a Pilot in This Form Factor
Any single skid can be sized to fit the smallest available transport leg, from a 4×4 trailer at 1.5 t to a heavy-lift helicopter at 9–12 t. The pilot reaches sites that no other form factor can.
Quick-connect process, electrical and instrument links between skids let the trial team swap a coagulation skid for a different one, or add a polishing skid mid-campaign, without rebuilding the plant.
After a campaign, the same skids can be lifted out, returned to the workshop and re-deployed to the next site. The bespoke engineering is in the process choice; the skid hardware is fleet-reusable.
Open-frame skid construction lets the trial team see every pump, valve and instrument. Easier to troubleshoot, easier to teach, easier to photograph for the project record.
No surplus container shell to ship. A 3 m³ skid often weighs half of an equivalent process volume housed in a 10′ container, reducing transport rate and crane requirement.
Common-parts catalogues (peristaltic pumps, ISO-flange fittings, DIN-rail electricals) mean a single spare-parts box covers every skid in the fleet.
Worst-Case Lift Sets the Largest Single Piece
| Transport mode | Max single piece | Typical use |
|---|---|---|
| 4×4 trailer (3.5 t rated) | 1.5 t per piece, 3.0 × 1.5 × 1.5 m | Forest tracks, ranch roads, established gravel |
| Light truck (5–7 t) | 5 t per piece, 4.5 × 2.0 × 2.0 m | Single-track roads, mountain passes |
| Helicopter internal (medium utility) | 2.0–2.5 t per piece, 3.0 × 1.5 × 1.5 m | Mountain refuges, polar field camps |
| Helicopter sling external (medium utility) | 3.5–4.5 t per piece, 4.5 × 2.0 × 1.8 m | Same access, larger pieces, longer flight |
| Heavy-lift helicopter sling | 9–12 t per piece | Where heavy-lift charter is justified by the duty |
| ATV / quad sled | 0.4–0.8 t per piece | Snow tracks, ice roads, beach landings |
| Pack animal / porter team | 0.05–0.10 t per piece | National-park or expedition delivery |
What Goes Wrong With Skid-Mounted Pilots, and the Fix for Each
Skid frames are open. Rain and dust find every fitting, snow loads the upper instruments, UV degrades cable insulation.
Removable tarpaulin or canopy during transport; permanent canvas or fabric awning bolted to the skid frame on site. All electricals rated IP66 minimum; cable trunking clipped to the frame and over-strapped for vibration.
Open construction makes the pilot a tempting target at unsecured sites.
Lockable canvas covers, perimeter intrusion sensors tied into the SCADA, CCTV with motion-triggered upload. For remote sites, livestock-grade fencing erected as part of mobilisation.
Quick-connect process and electrical links between skids fail more often than welded permanent equivalents.
Camlock or storz couplings rated for the working pressure; plug-and-socket electricals with IP68 connectors and lockable retention rings. Visual leak indicators on every connection. Daily walk-round check.
An open frame on a glacier or in a desert needs more thought than a sheltered industrial building.
Heat-tracing on every wet line for cold climates; reflective shrouds and shaded electrical cabinets in deserts. Climate envelope stated explicitly in the design report.
Where the pilot trial involves flammable feed (oil & gas pilots), open skids cannot use the inerting strategies available to closed containers.
ATEX-rated electricals (Ex-d or Ex-e) on every component, intrinsically-safe instrumentation, fixed gas detection with audible alarms. If the duty truly requires inerting, use the containerised form factor instead.
Skid layouts that look fine in CAD can be awkward when an operator needs to change a peristaltic head at 2 am.
Layout reviews with an operator in the loop. Every routinely-serviced component sized for one-handed access and 600 mm clearance. Tool kit and spares cupboard located on a dedicated services skid.
Building Blocks Bolted Together to Make the Pilot
Inlet pump, strainer, flow meter, equalisation tank (collapsible bladder for transport).
In-line mixer, flash mixer, dosing pumps, day-tank rack for coagulant and polymer.
Compact inclined-plate clarifier or skid-mounted DAF cell for solids and oil removal at pilot scale.
Multimedia, GAC or cartridge pilot columns logging head-loss and breakthrough.
Compact MBBR or SBR with adjustable carrier fill and DO setpoint.
UV reactor, hypochlorite generator or chlorine dosing skid with day-tank.
PLC, HMI, satellite modem, UPS in a single compact cabinet skid.
Generator, batteries, transformer and MCC in a single shared skid for the fleet.
All five form factors and the engineering approach behind them.
Hub PageWhen the trial duration justifies the larger enclosed footprint.
Read MoreRoad-legal towable for fastest on-site setup.
Read MoreLightweight space-frame for maximum reconfigurability.
Read MoreThe constraints every remote pilot has to solve.
Read MoreSame skid philosophy applied to permanent installations.
Read MoreThe broader pilot-testing service hub.
Read MoreSkid fabrication, FAT and shipping logistics.
Read MoreTell us the worst-case transport leg and the treatability question — we will engineer the skid decomposition and estimate within two weeks.
Our expertise spans multiple industries with sector-specific water treatment solutions.