Case Studies

Why does a high-sulfur gas pipeline demand stricter intrusion and leak detection than an ordinary one? Hydrogen-sulfide-bearing service is corrosive, hazardous to people and environmentally sensitive, so any third-party activity near the right-of-way must be identified early and located precisely. On this PetroChina pipeline, Landsub Global's DAS system was evaluated in a multi-vendor field trial alongside a leading global vendor — and Landsub Global's system achieved 100% on-site event recognition during the field test, after which it replaced the incumbent international vendor on the line. For the operator, the result demonstrated that the full in-house chain — optical path, demodulation and AI event classification — could outperform an established supplier under the most demanding service conditions, on the customer's own asset and on the customer's own test protocol.

What does it take to monitor a CO₂ pipeline for carbon capture, utilization and storage? CCUS CO₂ pipelines are a young asset class: the transported fluid is dense-phase, odorless and harder to trace than natural gas, so third-party intrusion and leak early-warning has to come from the sensing system itself. Landsub Global delivered the intrusion and leak early-warning system for PetroChina's CCUS CO₂ long-haul pipeline — the first application of third-party intrusion and leak early-warning on a CCUS CO₂ long-haul pipeline in China. The deployment extended distributed fiber optic sensing from conventional hydrocarbon service into carbon-management infrastructure, and it was followed by further first-of-kind applications, including high-sulfur pipe-in-pipe monitoring for Sinopec described below.

Across these references, three practices repeat on every project:

1. Field calibration before go-live. Alarm thresholds and AI event models are tuned against real signatures on the customer's terrain — soil, traffic, farming, construction — before the system takes operational duty.
2. Verification against ground truth. Every acceptance figure in this page is the product of alarm-by-alarm checking against actual events, recorded by the customer's own test or acceptance protocol.
3. Long-term operation, not one-off demos. The 95% and ≥96% effective alarm rates were sustained over continuous service on live pipelines, which is a harder test than any trial.

Do these results only apply to oil and gas pipelines? No — the underlying platform is the same. The DAS units that delivered 100% field-test recognition on a high-sulfur pipeline and 95% effective alarm rate across 59.14 km are the same hardware and AI stack that Landsub Global deploys on power cable tunnels, railway and highway structures, conveyor systems and live optical cable networks. What changes between sectors is the event model and calibration, not the sensing chain. For example, the largest cross-section highway tunnel we monitor uses our structural monitoring approach on the DTSS-BOTDR side, while in-service fiber monitoring keeps telecom and composite cables under 7×24 watch to 100 km with ±1 m fault location. When you evaluate us for a new sector, the pipeline references on this page serve as engineering evidence of range, sensitivity and alarm discipline — and our job in the proposal is to show how the same field-calibration method maps onto your asset.