For more than half a century, pressure testing, also known as hydrotesting, has been a cornerstone of pipeline pre-commissioning. Before any new pipeline, or pipeline that transports hydrocarbons, can operate, it must prove that it can safely handle its intended operating pressure without leaks, structural compromise, or integrity concerns. Existing or in-service pipelines are often required to be pressure tested under specific conditions to verify integrity, satisfy regulatory requirements, or re-establish maximum allowable operating pressure (MAOP).
It’s a simple concept on paper: fill, pressurize, hold, and verify. But in practice, it’s one of the most technically demanding, time-consuming, and risk-sensitive operations in the entire commissioning sequence.
Historically, the procedure has relied on manual observation, pressure charts, and subjective interpretation – methods that, while serviceable, have changed little since the 1970s. Yet the pipeline industry around it has transformed. Digital twins, real-time data feeds, and predictive analytics are now standard elsewhere in the lifecycle. It was only a matter of time before pressure testing caught up.
That transformation is now underway.
Why pressure testing matters in pre-commissioning and startup
Pressure testing is more than a regulatory checkbox; it’s the final proof of construction integrity before a pipeline goes live. Conducted after fabrication, welding, and cleaning, the test simulates the pipeline’s operational conditions and verifies its ability to maintain pressure without leaks or material deformation.
Regulatory bodies such as the Pipeline and Hazardous Materials Safety Administration (PHMSA) and standards like API RP 1110 and ASME B31.4 mandate pressure tests as part of a commissioning program. For operators, the test not only validates workmanship and design but also provides baseline data that informs future integrity assessments. In high consequence areas, this process is critical to environmental protection and community safety.
The traditional workflow is well known; fill the pipeline, raise pressure gradually to the specified test value, hold it for a defined duration (often eight hours), then depressurize and dewater. Throughout the process, pressure and temperature are monitored, with data logged and interpreted to confirm whether any drop indicates a true leak or a natural thermal shift.
Yet this simplicity masks a complex challenge: the relationship between pressure and temperature is nonlinear. A 1° temperature change can mimic a pressure loss that appears to signal a leak. Engineers have spent decades trying to distinguish the two through manual corrections and experience. That guesswork has often led to unnecessary re-tests, project delays, and millions of wasted costs.
The problem with ‘good enough’ testing
For decades, pressure testing technology has stagnated. Operators relied on analog gauges, periodic digital readings, and hand-written notes that were later entered into spreadsheets. Data density was low, interpretation was delayed, and conclusions were sometimes ambiguous. If a pressure drop was seen, teams might halt the test, suspect a leak, and re-pressurize, only to discover the issue was thermal contraction.
In this subjective paradigm, testing outcomes depended heavily on operator judgement. The margin for error wasn’t just scientific; it was human. In large, multi-segment projects, a single retest could mean several days of schedule slip, additional labor mobilization, and costly water management activities. The environmental footprint and safety exposure from repeating fill-and-bleed cycles also grew with each uncertainty.
This was the environment that Charps set out to change.
Building on a legacy of integrity
For over 25 years, Charps has been a trusted name in pipeline construction, maintenance, and integrity management across North America. From coating rehabilitation to valve replacements, anomaly digs to system upgrades, the company has earned its reputation by executing with precision, transparency, and safety at scale. Our philosophy is simple: integrity management is a continuous lifecycle, not a one-time project.
The teams approach each pressure test as both a verification event and a learning opportunity. Every weld, every joint, every piece of documentation contributes to a larger integrity story. Our commitment to disciplined project management and rigorous QA/QC ensures compliance with 49 CFR Parts 192 and 195, while emphasis on safety aligns with API RP 1173 and ISO 45001 frameworks.
Yet even the most experienced contractors knew that testing process itself, including data collection, interpretation, and approval, was overdue for innovation. The opportunity came when Charps partnered with PipeSense to integrate advanced sensing and analytics into their field operations.
Bringing data-driven precision to pressure testing
PipeSense was founded with a mission to eliminate the uncertainty that has long defined leak detection and hydrotesting. The company’s PipeTest service, featuring its HydroView dashboard, reimagines the pressure test from start to finish. Instead of sparse manual readings, PipeTest captures ultra high-frequency data — pressure, temperature, and stabilization trends — every second, all visualized in real time through a client dashboard.
Where a traditional hydrotest produces a few dozen data points, PipeTest generates hundreds of thousands. And with that granularity comes insight.
PipeTest integrates:
– Real-time temperature correction, using ground and fluid sensors to distinguish true pressure loss from thermal drift.
– AI-driven leak detection and localization, pinpointing leak events often within ±30 yards in under two minutes.
– Interactive visualization, allowing inspectors and engineers to monitor every aspect of the test live from any connected device.
Redefining pressure testing
The collaboration between Charps and PipeSense represents a convergence of field expertise and data science. Charps brings decades of practical experience executing pressure tests safely and efficiently, and PipeSense adds advanced analytics and automated intelligence that remove ambiguity from the process.
Together, the companies have created a system where every stage of pressure testing — planning, execution, verification, and reporting — is digitized, traceable, and instantaneous. Engineers no longer wait hours to interpret charts. Supervisors no longer debate whether a pressure decline is thermal or structural. The answer is right there, in the data.
For operators, this partnership means:
– Integrated planning tests are developed and reviewed between all parties, ensuring safety, efficiency, and cost-effectiveness of execution by aligning resources, schedules, and controls.
– Faster turnaround times – tests can be approved or flagged in real time, often saving full days on the schedule.
– Reduced resource use – fewer retests mean less water handling, less energy consumption, and smaller environmental impact.
– Improved compliance – digital records are auditable and align with PHMSA documentation requirements.
– Increased confidence – clear, temperature-corrected data removes the guesswork from pass/fail decisions.
This approach transforms what was once a reactive process into a predictive one. It brings the same level of intelligence that operators expect from leak detection or pig tracking into the pre-commissioning phase, closing the loop on lifecycle integrity.
How pressure testing actually works — and how it’s changing
At its core, a pressure test involves four key phases:
Preparation
The pipeline is cleaned, filled, and instrumented with pressure and temperature sensors. Valves are secured, and test limits are set.
Pressurization and hold
Pressure is raised gradually to the target test level and held for a defined period, during which stability is monitored.
Monitoring and verification
Pressure and temperature data are collected continuously to assess stability and identify anomalies.
Depressurization and evaluation
Once the test passes, pressure is released, and data are compiled for final reporting.
Traditionally, the monitoring and verification phase relied on intermittent manual readings. Now, with systems like PipeTest, data is captured continuously, analyzed in real time, and corrected automatically to ambient and fluid temperature. This innovation virtually eliminates false indications and allows operators to see the precise moment of stabilization.
Instead of waiting until after depressurization to determine success, engineers can make data-driven decisions during the test itself. This real-time visibility not only accelerates commissioning but also strengthens safety by enabling immediate response if a true leak event occurs.
The operational and economic impact
The benefits of modernized pressure testing extend well beyond engineering convenience. The implications touch nearly every aspect of project delivery and asset management:
– Schedule efficiency: eliminating retests can shorten commissioning timelines by days or weeks — an advantage that compounds across multi-segment projects.
– Cost reduction: accurate, temperature-corrected analysis prevents unnecessary re-pressurization and resource waste.
– Regulatory readiness: the HydroView dashboard’s digital audit trail simplifies compliance documentation and third-party review.
– Environmental stewardship: less water usage, fewer emissions from retesting, and minimized site disturbance align with corporate ESG goals.
– Stakeholder confidence: operators, regulators, and contractors share one transparent dataset, ensuring mutual understanding and accountability.
In short, what was once an opaque, uncertain process is now a transparent, data-validated demonstration of pipeline readiness.
Field-proven performance
Charps and PipeSense have collaborated on multiple live projects across North America, applying PipeTest technology alongside Charps’ field expertise. Results have included:
– Retests were reduced by more than 70%, thanks to early identification of micro leaks and temperature-related anomalies.
– Real-time approvals, with test outcomes verified immediately upon stabilization.
– Fewer false positives, leading to measurable savings in time, water, and labor.
A data ecosystem for the entire pipeline lifecycle
The modernization of pressure testing is only one piece of a broader transformation. Additional technologies for continuous leak detection, blockage identification, and pig tracking extend the same real-time visibility into every stage of pipeline operation.
For Charps, this integration enhances our core mission of maintaining safe, reliable, and compliant pipelines throughout their service life. What begins as a pressure test evolves into a continuous data stream that supports future inspections, maintenance, and regulatory reporting.
This ecosystem approach — combining field execution with edge computing and AI analytics — creates a future where pipeline integrity is not just validated periodically but monitored continuously.
The human element: expertise still matters
While technology has transformed pressure testing, success still depends on skilled professionals who understand the nuance of pipeline behavior. Certified crews, with decades of field experience, remain essential in ensuring tests are performed safely and in compliance with regulations. PipeSense’s systems don’t replace that expertise; they amplify it.
By equipping technicians with real-time insight, they can make better, faster, and safer decisions in the field. It’s a synergy of human judgment and digital precision — one that keeps people and assets protected.
Looking ahead: the future of pre-commissioning
As the energy sector accelerates toward lower-carbon operations, emerging fuels like hydrogen and CO₂ demand even more stringent verification protocols. Pressure testing will only grow in importance and complexity. Modernized, data-driven systems are already proving essential in these new applications, providing the accuracy and transparency regulators and communities expect.
For Charps and PipeSense, the mission is clear: bring clarity where uncertainty once ruled, and efficiency where delays were inevitable. Together, they prove that pressure testing doesn’t have to be a slow, manual ritual. It can be a precise, intelligent process that accelerates safe startups and ensures long-term integrity.
Pressure testing remains the unsung hero of pipeline commissioning — a critical safeguard before the first molecule of product ever moves. But like so many legacy practices in the energy sector, it was overdue for reinvention.
By combining field excellence with advanced analytics, pressure testing has entered the digital age. The result is faster startup, better data, lower costs, and — most importantly — greater safety and confidence. In an industry built on precision, the message is simple: pressure testing has finally caught up with the 21st century.
Joe Van Vynckt, CEO, Charps, PipeSense, Norminn Industrial