The carrier that rides existing line. A module-train carrier sized to the bore that rides pipe, culvert and conduit already in the ground, on the flow, on its own drive or on a tether.
Five figures size the carrier. Four reasons explain why an operator sends it down the line instead of opening the ground.
It enters at a fitting the line already has and leaves at another. The line stays in service throughout, and the ground above it is never touched.
Flow-driven in a live line, self-propelled in a dead one, tethered where the run needs a fixed speed and a hard stop on command. Propulsion, payload and the comms plan are selected before insertion rather than fixed at the factory.
A modular bay amidships of ~8–15 kg and ~10 L takes the inspection package as its baseline, and carries sensors, relays, fibre and service fluids through the same interface. Nothing energetic is a permitted payload class.
The cylindrical form, the sealing discs and the trap handling come from a decades-old industrial tool class, and the group's pipeline practice runs bi-directional pigs for cleaning and gauging today. The carrier is the new engineering; the pigging is not.
The product specification and the systems engineering behind it, grouped the way an integration lead reads an in-line carrier: the body family, what it is made of, how it moves, how it seals, what it carries, how it navigates and reports, and how it goes in and comes out.
Body familyMaterialsPropulsionSeals and pressurePayload bayNavigation and commsLaunch, recovery and operating rulesClassification
| Parameter | Value | Basis |
|---|---|---|
| Configuration | Cylindrical pipeline and conduit-class carrier with sealing discs and a modular payload bay | the product specification table |
| Body diameter range | ~150–600 mm (~6–24 in) nominal bore classes, disc-set matched | design value, the product specification table |
| Length | ~1.1–1.6 m (class-dependent) | design value, the product specification table |
| Mass | ~35–90 kg (class-dependent) | design value, the product specification table |
| Architecture | A train of short cylindrical modules on articulated joints | bend passage is governed by the longest rigid element, not by the whole vehicle |
| Module order, nose to tail | Payload bay · electronics and battery · drive module · tail cup or tether terminus | the module-train layout |
| Centring | Every module carries its own cups or discs | the train stays centred through fittings |
| Family scaling | Made per bore size; electronics, payload interface and software common; cups, chassis rings and drive arms scale | the family scaling rule |
| Parameter | Value | Basis |
|---|---|---|
| Chassis rings, module shells, joint hardware | Glass-filled nylon | loads are compressive and abrasive rather than aerodynamic |
| Cups and discs | Cast polyurethane-class elastomer | the pipeline trade's standard pig material for abrasion life; the elastomer is the consumable |
| Covers, end fairings, training bodies | Recycled PET, non-structural | nothing recycled carries load or seals pressure |
| Electronics housing | Sealed external-pressure vessel, rated above the line's maximum operating pressure with margin | the vessel is loaded from outside, so the question is stability rather than containment |
| Parameter | Value | Basis |
|---|---|---|
| Propulsion modes | Flow-driven · self-propelled · tethered, selected per mission | the product specification table |
| Flow-driven | Sealing discs ride the pressure differential of a live product flow | the product specification table |
| Flow-mode speed control | Adjustable bypass port through the body; deployable friction shoe as the brake | the standard speed-control answer in gas service |
| Self-propelled | Wheels or tracks under its own power, for dry or non-flowing conduits | the product specification table |
| Self-propelled traction | Spring-loaded arms press the drive wheels to the wall, on guide discs | the crawl-mode mechanism |
| Tethered | Controlled pull on a fibre-composite umbilical from a surface winch: fixed speed and a hard stop on command, power and comms down the tether | the product specification table and the tethered-mode mechanism |
| Speed, flow-driven | ~0.5–2 m/s, line-speed dependent | design value, the product specification table |
| Speed, self-propelled | Up to ~0.8 m/s | design value, the product specification table |
| Run length, flow-driven | Up to ~20 km, logged run (class-dependent) | design value, the product specification table |
| Run length, tethered | Up to ~5 km (class-dependent) | design value, the product specification table; the bend count also limits a tethered run |
| Tethered reach limit | Cumulative bend angle: tether tension multiplies exponentially over the bends | the capstan relation; the route survey counts bends before anyone mobilizes |
| Parameter | Value | Basis |
|---|---|---|
| Sealing discs | Rated to the line-pressure design case, nominal ~700 kPa (~100 psi) | design value, the product specification table |
| Flow-mode elastomer set | Dished sealing cups, oversized to the bore | the differential energizes the lip: the harder the line pushes, the tighter the seal |
| Self-propelled and tethered elastomer set | Flat guide discs, near line-to-line, deliberately non-sealing | centring at a fraction of the drag where no differential exists |
| Changing mode | Same chassis, different elastomer set | a tooling change rather than a redesign |
| Parameter | Value | Basis |
|---|---|---|
| Payload bay | Amidships, modular: ~8–15 kg / ~10 L | design value, the product specification table |
| Baseline suite | Inspection package: wall-thickness and corrosion gauging, geometry and deformation mapping, run odometry | the product specification table |
| Payload classes | Inspect · emplace · lay fibre · treat | one bay, four classes, all non-kinetic |
| Mechanical interface | Standard module length per bore size · common chassis-ring bolt pattern · common articulation coupling | the bay interface, defined once for every class |
| Electrical interface | One connector: regulated power · data bus · safety-interlocked actuate line | the bay interface, defined once for every class |
| Payload class boundary | Non-kinetic only: no warhead, no fuze, no energetic material and no terminal-effect device, in any module | a design exclusion written on the interface |
| Parameter | Value | Basis |
|---|---|---|
| Navigation | One-dimensional: distance along the line | position in a pipe is a single number |
| Odometry | Spring-loaded odometer wheels, several and voted; the drive wheels in self-propelled mode | the standard in-line inspection method |
| Drift correction | Girth-weld detection re-zeros the count; a small inertial unit adds attitude and bend detection | passive corrections against the pipe itself |
| Surface truth | A crew or above-ground markers confirming passage by passive magnetic detection | nothing is emitted to find the carrier |
| Comms, tethered | Fibre tether: real-time control and data | the product specification table |
| Comms, untethered | Position and sensor data logged onboard, offloaded at the receiver or exit point | the product specification table |
| Radio and GNSS | None: no radio, no GPS; pipe and conduit are RF-dead environments by nature | the product specification table |
| Untethered autonomy | A pre-planned script against odometry waypoints; the vehicle cannot roam | a person authorizes every actuate event before insertion |
| Parameter | Value | Basis |
|---|---|---|
| Launch and receive | Standard pig launcher and receiver-style trap access points | the product specification table |
| Gauge run | Never enters a line a gauge run has not been through first | an operating rule inherited from the group's pigging practice |
| Gas service | No emplacement without the tether or the self-propelled mode | a stuck-then-released carrier in gas accelerates violently |
| Line access | Settled by ownership and permission before any run; counsel first on third-party infrastructure | outside the engineering boundary |
| Parameter | Value | Basis |
|---|---|---|
| Munitions classification | Carrier, not a munition: never itself armed, carries nothing energetic | the product specification table |
| Boring scope | CS-410 and Aquifer CS-411 make the hole; CS-460 never bores | the product specification table |
| Patent status | Patent pending | the product specification table |
| Export control | Export-controlled; international transfer subject to Canadian government permits; counsel first | the product specification table |
Boring is expensive, disruptive and slow, and most of the network a utility, a pipeline operator or a facility needs inspected or serviced is already in the ground and ready to carry a vehicle.
CS-460 sits apart from the rest of the Underground family. Every other platform there enters ground that has to be made, found or opened; this one rides pipe, culvert and conduit that is already open, carrying the sensor or the tool through it without touching soil. CS-410 and Aquifer CS-411 make the hole.
The form comes from a decades-old industrial tool class, the pipeline inspection gauge the trade calls a pig: a cylindrical device run through a live line for cleaning, product batching or inspection. Canadian Shield did not invent that tool class. The carrier keeps its form, its sealing discs and its launcher-and-receiver handling and builds them out for sensing and payload modules rather than one fixed tool.
No trench is dug to reach the line or to leave it, and the ground over the run stays as it was.
In flow-driven mode the product flow that keeps the line in service is the propulsion, and the run happens inside normal operation.
It goes where a hazardous, confined space would otherwise mean sending a person in after it. Nothing about it is launched: it is inserted, driven and received.
A live line gives propulsion away, a dead conduit gives none, and a run that has to stop on command wants a wire.
| Mode | How it moves | Where it fits | What limits it |
|---|---|---|---|
| Flow-driven | Sealing cups take the differential of a live flow; a bypass port bleeds flow past the body to set speed | A live, flowing, trap-equipped line; no onboard propulsion energy | A dead, dry or unserviced conduit has no differential to ride |
| Self-propelled | Spring-loaded arms press drive wheels to the wall, on guide discs | Dry, low-flow and dead line, culverts and conduits, and wherever stop-and-hold matters | The battery bounds the range |
| Tethered | Pushed and pulled on a fibre-composite umbilical from a surface winch, with power and comms down the wire | Power, bandwidth and a retrieval that is a pull on a wire | Cumulative bend angle bounds the reach |
Flow-driven, the carrier travels at line speed, about 0.5–2 m/s, and a logged run reaches up to about 20 km, class-dependent. Under its own power it moves at up to about 0.8 m/s. A tethered run reaches up to about 5 km, class-dependent, and the bend count on the route limits it as well. Class-dependent figures move with the bore served and the disc set fitted.
Bend passage is governed by the length-to-diameter ratio of the longest rigid element rather than of the whole vehicle, and that one fact sets the architecture.
The carrier is a train of short cylindrical modules linked by articulated joints of universal or flexible-coupling class, the standard in-line inspection architecture and standard for the same reason. Nose to tail the train runs payload bay, electronics and battery, drive module, then a tail cup or the tether terminus. Every module carries its own cups or discs, so the train stays centred through a fitting instead of dropping a shoulder into it.
A carrier is made per bore size rather than stretched across sizes. The electronics, the payload interface and the software are common across the family; the cups, the chassis rings and the drive arms scale. The family's sizing logic is a crossover: flow-driven thrust grows with bore area, so flow drive gets easier as the pipe gets bigger, while a crawler's battery burden grows with diameter, so self-propulsion favours the small end.
Sealing cups, for flow drive. Dished elastomer, oversized to the bore, presenting a flexible lip that the differential pressure presses against the wall. The harder the line pushes, the tighter the cup seals, and that is what lets a carrier ride a live line. Cups are also the main source of drag aboard, a cost the line pays for.
Guide discs, for wheels and wire. Flat, near line-to-line and deliberately non-sealing, they centre the carrier at a fraction of the drag. Where no differential exists and every newton of drag is battery or winch load, the carrier keeps its centring and gives up a seal it cannot use.
Changing mode is the same chassis with a different elastomer set: a tooling change rather than a redesign. The sealing discs are rated to the line-pressure design case, nominal about 700 kPa (about 100 psi).
Driving force is the pressure differential across the sealed face times the area of that face, so available thrust grows with the bore.
In a live line, propulsion costs nothing aboard, and the engineering at this end is speed control. The answer is the standard one from gas service: an adjustable bypass port through the body bleeds flow past the carrier to regulate its speed, with a deployable friction shoe to brake it. A run that reaches the right place at the wrong speed has neither placed its payload nor measured the wall.
Gas service adds a hazard with its own standing rule. The gas column behind a stuck carrier behaves as a spring, and a carrier that sticks and then releases accelerates violently. Nothing is emplaced in gas service without the tether or the self-propelled mode.
In gas service the line sets the speed and a stuck carrier can release violently, so precision work runs on the tether or on the carrier's own drive.
On guide discs the drag is mechanical rather than pressure-energized, and the carrier's own pack pays for every metre.
Spring-loaded arms press the drive wheels to the wall, and the wheels give odometry at the same time. Traction is set by that preload, and every newton of preload is also rolling drag, so preload is spent rather than simply applied. Under its own power the carrier moves at up to about 0.8 m/s, and it can stop and hold, which is what emplacement and treatment need.
The battery bounds the run, so the conclusion is a scoping one: the mode serves short, dry and dead line and hands long lines to flow drive or the tether.
Tether tension multiplies over cumulative bend angle rather than adding up along the length. It is the capstan relation, and it is exponential.
A route with many bends can bring a modest straight-line pull to a large load at the winch, so the route survey decides a tethered run before anyone mobilizes, and the number that matters in it is the bend count rather than the distance. A low-friction jacket and traction assist from the carrier buy margin; neither repeals the exponent. The product specification gives a tethered run of up to about 5 km, class-dependent.
The fibre and the payout discipline that manages it are shared with the family's own tether work, so one payout competency serves the boring plant, the tethered mode and the lay-fibre payload.
The electronics live inside a line under pressure, and that makes the housing a pressure-vessel problem rather than a gasket.
The housing is rated above the line's maximum operating pressure with margin. It is the reverse of the usual case: the vessel is loaded from outside, so the design question is stability rather than containment. The same sealing that keeps the product out keeps heat in. Battery and motor heat has no airflow to reject into, only conduction to the shell and on to the pipe wall, and that path is the whole thermal design.
The structural life is abrasion, external pressure and bend-cycling fatigue at the joints. With no launch shock, no aerodynamic load and no impact requirement anywhere in the design, the structure is sized against what the pipe does to it.
Chassis rings, module shells and joint hardware. The loads are compressive and abrasive, a materially easier case than any flying structure.
The trade's standard pig material for abrasion life, cast at low pressure on moulds the group cuts in its own shop. The elastomer is the consumable, by design.
Non-structural covers, end fairings and training bodies. Nothing recycled carries load or seals pressure.
Handling mirrors the pipeline trade's own pigging practice, because the fittings on a serviced line were built for exactly this operation.
Inserted at a pig launcher or an equivalent access point, with the payload module fitted and the mode chosen for the line: flow-driven if it is live, self-propelled if it is not, tethered if the run needs a fixed speed and a hard stop.
It rides the flow, its own drive or the tether, carrying and sensing the length of the run. Data streams over the fibre where a tether is fitted and is logged aboard where it is not, and the line stays in service.
Retrieved at a receiver or exit point, or pulled back on the tether. Logged data comes off at the receiving end, the way an inspection gauge has always come home.
The line itself is the hazard list, and every item on it is a known class with a known answer. Girth-weld root beads, mitred joints, unbarred tees where a cup can dive into a branch, reduced-port valves, dents, ovality, wax, scale and diameter transitions are met with bumper noses, disc spacing that always keeps two supports in the barrel, and a minimum-bore gauging run first. That last is a rule inherited from the group's pigging practice: CS-460 never enters a line a gauge run has not been through.
Whether a given line may be entered at all is not an engineering question. On line an operator owns or holds contracted access to, entry is a commercial fact and a permit to work; on any other infrastructure it is a legal question first, and it goes to counsel before a run is scoped.
The bay sits amidships at ~8–15 kg and ~10 L, and its interface is defined once, so a new payload is a tooling change rather than a new vehicle.
Wall-thickness and corrosion gauging, geometry and deformation mapping and run odometry, with camera, laser profilometry, leak and gas sensing, and pressure and temperature logging on the same bay.
Sets down a seismic or acoustic node, a relay or a marker at a surveyed point, through a bay door and an ejector commanded at an odometry waypoint.
Pays out optical fibre as the carrier travels, the family's fibre-conduit work carried through pipe that already exists.
Discharges internal sealant, corrosion inhibitor or repair material at a defect an inspection run found, from a tank through a pump and valve set to an applicator ring.
Mechanically the interface is a standard module length for each bore size, a common chassis-ring bolt pattern and a common articulation coupling. Electrically it is one connector carrying regulated power, a data bus and a safety-interlocked actuate line. Wall-thickness sensing is where a carrier has to be exact about what it buys: magnetic flux leakage is the industry workhorse and its magnet and yoke mass weighs on the bay budget, conventional ultrasonics need a liquid couplant, which suits a liquid line and not a gas one, and electromagnetic acoustic transducers work without one. Canadian Shield builds the carrier and partners the sensing physics.
The bay volume and the actuate line are engineered for sensors, relays, fibre and service fluids. No warhead, no fuze, no energetic material and no terminal-effect device is a permitted payload class, in any module, for any customer.
What changes between the builds is the elastomer set, the drive module and the tail, and every build shares the electronics, the payload interface and the software.
For a live, flowing, trap-equipped line. The flow is the propulsion, the bypass port sets the speed, the friction shoe brakes, and a logged run reaches up to ~20 km, class-dependent.
For dry, low-flow and dead lines, culverts and conduits, and any run that must stop and hold. Up to ~0.8 m/s, with the drive wheels doubling as odometry.
For runs that need live control, a fixed speed, a hard stop on command and a retrieval by pull. Power and comms come down a fibre-composite umbilical from a surface winch.
Made across nominal bore classes of ~150–600 mm with the disc set matched to the bore. Cups, chassis rings and drive arms scale; the electronics, the payload interface and the software stay common.
The lines that hold in every mode, in every module and for every customer.
The page this sheet specifies, and the sheets beside it in the line.
The page this sheet specifies, with the pictures and the reasoning.
A first conversation needs the bore class, the product in the line, the operating pressure, the bend count and the traps the line already has.
Not an offer. Enquiries are screened, international transfer is subject to Canadian government permits taken per shipment, and all designs, systems and technologies shown are patent pending.
