Manufacturing line/Pipelines/Line pipe
Autonomous · Pipelines

Line pipe

Steel that reports on itself, every metre, for fifty years.

Phase 8 · 2035+Concept design
Diameter
48 in
Pressure
150 bar
Sensing
Every 1 m
Design life
50 years
I · Blueprint
Buried line and line site, live systems
ELEVATION · LINE SITE AND BURIED LINE · HORIZONTAL SCALE COMPRESSEDWARNING TAPEGAS FLOW 690 kg/s →COVER0.9 mOD1,219 mmDOUBLE JOINT 24.4 mANODE WELL60 m→ NEXT LINE SITE 32 kmSplice closureSensing cable on the crownCold field bend ≥ 40 D, robot-passableBall valve — full boreGas tap & regulatorCamera & radio mastLine-site cabinetsCP test postAccumulatorsProtective current flows from the anodethrough the soil onto the coated pipeAA01031502041314050616070809101112SECTION A–A · PIPE IN THE TRENCHDETAIL B · WALL BUILD-UPDETAIL C · ROBOTIC GIRTH WELDtapeCOVER0.9 mTRENCH 2.0 m3-layer PE coatflow out of pageOD 1,219 mmID 1,169 mmSensing cable — DAS · DTSInternal flow coat — epoxy 80 µmX80 steel — 25 mm, yield 555 MPaFusion-bonded epoxy — 0.4 mmCopolymer adhesive — 0.3 mmPolyethylene — 3.0 mmSensing cable strapped at the crownbore (gas) ↓Hoop stress at 150 bar: 150 × 1,219 ÷ (2 × 25) = 366 MPa= 66% of yield · hydrotest 188 bar = 82%Layers shown thicker than scaleRoot — internal welderHot passFill — orbital headsCap25 mmEvery weld: 100% automated ultrasonic test,recorded against the joint’s serial number
01Line pipe — 48 in, X80, 25 mm wallPipe
02Three-layer polyethylene coat, 3.7 mmProtection
03Girth weld — robotic, 100% ultrasonicPipe
04Field-joint sleeve — induction-bondedProtection
05Sensing cable on the crown — DAS · DTSSensing
06Splice closure — every 4 kmSensing
07Mainline ball valve — 48 in, full boreValve & power
08Actuator — electro-hydraulic, 30 s strokeValve & power
09Accumulators — 4 × 100 L, three strokesValve & power
10Line-site cabinets — CP, interrogator, computeValve & power
11Fuel cells — 2 × 1 kW on line gasValve & power
12Battery — 30 kWh LFP, 48 VValve & power
13Deep-well anode groundbed — 60 mProtection
14CP test postProtection
15Sand padding and 0.9 m coverPipe
16Camera and radio mastSensing
II · Power & drivetrain

A line with no engine still needs power.

The pipe moves 30 MW of compressed gas and spends 0.6 kW of its own at each line site: cathodic protection, a fibre interrogator, compute and a valve that closes on command. Every 32 km a line site makes that power from the gas it guards.

Line-site power and valve unit — rotating view
A pressure tap on the pipe crown feeds two solid-oxide fuel cells through a regulator. They hold a 48 V bus and a 30 kWh battery that runs the cathodic-protection rectifier, the fibre interrogator, the compute and the valve’s hydraulic pump. The anode well sits 60 m down beside the line.
01Line pipe — 48 in, 150 bar
02Mainline ball valve — full bore, trunnion
03Actuator — electro-hydraulic, 375 kN·m
04Accumulators — 4 × 100 L at 210 bar
05Fuel cells — 2 × 1 kW solid-oxide, line gas
06Battery — 30 kWh LFP, 48 V bus
07CP rectifier — 50 V / 20 A, running 8 A
08Interrogator and compute — DAS · DTS, 2 AI modules
09Deep-well anode — 60 m
10Sensing cable — on the pipe crown
Ball valve — quarter turn
Bore1,169 mm, full bore, robot-passable
Rating150 bar
Break-out torque250 kN·m
Actuator output375 kN·m
Stroke90° in 30 s
Stored energy3 strokes, 2.0 MJ
Isolation≤ 45 s from leak to closed valves
Naked power chain — line gas to protection, sensing and a closed valve
III · How it is put together

Rolled, coated, welded, buried, switched on.

Plate becomes pipe in the mill, pipe becomes a string on the right-of-way, and the string becomes a line when the line site powers up. The loop below replays the build order.

PLATE 25 mmU-PRESSO-PRESS · SEAM WELDEXPANDED · TESTED · COATEDDOUBLE 24.4 mRIGHT-OF-WAYORBITAL WELDLINE SITE ON
I
Plate formed and seam-welded, 12.2 m joints
II
Expanded, hydrotested, coated inside and out
III
Double-jointed to 24.4 m in the pipe yard
IV
Welded into the string by robots, sensing cable strapped on
V
Lowered, padded and backfilled; line site switched on
IV · Specification

Design specification.

Design specification for the IC 48-inch gas line and its line sites.

Outside diameter
48 in (1,219 mm)
Wall thickness
25 mm
Steel
X80, 555 MPa yield
Max operating pressure
150 bar
Hoop stress
66% of yield
Hydrotest
188 bar
Joint
12.2 m · 24.4 m double
Mass
736 kg / m
Coating
Three-layer PE, 3.7 mm
Throughput
≈ 83 million m³ / day
Gas velocity
4.8–6.7 m/s
Compressor spacing
250 km
Line sites
Every 32 km
Site power
0.6 kW from line gas
Leak location
±1 m within 10 s
Metal content
≈ 98% of line pipe
Onboard compute
Two small modules per line site listen to 32 km of fibre
Modules2 light AI modules per line site + 1 certified safety controller (SIL 3); one line site every 32 km
CPU16 cores (2 × 8), plus 2 lockstep real-time cores per module
AI throughput3,000 TOPS per site (2 × 1,500, INT8 / FP4 sparse)
Memory2 × 64 GB LPDDR6, 300 GB/s per module
Power draw82 W compute; ≈ 0.37 kW with the fibre interrogator, cameras, gas detectors and radio, inside the 0.6 kW site
Process node2 nm-class SoCs; safety controller on a mature 16 nm node, 15-year supply. Compute is a line-replaceable unit, swapped at mid-life.
RedundancyEvery sensor is wired to both modules. Each module is primary for its zone (16 km of fibre upstream or downstream) and hot standby for the other. A software fault can never drive the line outside its certified safe envelope.
Safety channelThe SIL 3 controller closes the valve on its own sensors: two-out-of-three pressure transmitters each side of the valve, valve limit switches and actuator pressure switches
SensorsDAS and DTS on 32 km of fibre (32,000 channels at 1 m), 6 pressure and temperature transmitters, gas detectors, valve position; 2 mast cameras on automotive Ethernet through a camera aggregation switch
LinkFibre in the same cable to the next site and The Brain, 10 Gbit/s; satellite backup. The pump drive closes its own current loop at 1 kHz.
The modules turn 1 Gbit/s of fibre signal into a few events a minute: a strike, a leak, a vehicle on the right-of-way. The Brain sets pressures for the whole line each second. Nothing that protects the line waits for it: the certified controller closes the valve on its own sensors.
Today vs IC
Pipe and monitoring: today’s trunklines beside the IC design
Today · interstate gas trunklineIC design
Pipe30–48 in, 0.5–0.6 in wall, X52–X80 steel, FBE or three-layer PE coat48 in, 25 mm X80, three-layer PE outside, flow coat inside
Pressure500–1,800 psi (34–124 bar)150 bar, 66% of yield
CompressionStations every 50–100 mi (80–160 km)Stations every 250 km
Throughput2.0 Bcf/d in a 42 in line at ≈ 7 m/s≈ 83 million m³/day (2.9 Bcf/d) at 4.8–6.7 m/s
MonitoringSCADA at stations and valves; patrols on the right-of-wayFibre sensing every metre; a line site every 32 km
InspectionIn-line inspection at least every 7 yearsA robot through every segment every day
The IC column is the design shown on this page. Sources for the Today column are listed in BUILD_NOTES.md.
Runs on The Brain
Every valve, rectifier and fibre channel on this line is planned by The Brain, mirrored in the network’s digital twin, and re-planned the moment reality drifts.
See how it works →
Continue
Compressor station →← Track system