Pipeline Integrity Testing
Each year thousands of pipelines break across all industries, from energy to municipal, causing millions of dollars in damage and downtime. The best way to avoid this problem is to take a proactive approach through pipeline integrity testing. Integrity testing is used to examine the structural integrity of a pipeline system. This type of testing is a universal method that can apply to almost any pipeline.
One of the main types of pipeline integrity testing is hydrostatic testing. Typically, hydrostatic testing is required to install a new pipeline system. Using this type of testing, you can ensure that your new pipeline systems will operate at maximum fitness.
American Pipeline Solutions provides professional pipeline integrity testing services nationwide, helping operators evaluate pipeline strength, detect leaks, and maintain reliable infrastructure.
From municipal water mains and wastewater force mains to industrial, oil, and gas pipelines, APS delivers hydrostatic pressure testing, pipeline inspection, and condition assessment support. Our experienced team helps clients verify pipeline performance, reduce operational risks, and make informed maintenance decisions.
American Pipeline Solutions’ Pipeline Integrity Testing Process: Hydrostatic Testing
The first step that APS takes when performing hydrostatic testing is to fill your pipeline. Our team uses high flow pumps during this filling process. Once the pipeline has been filled, the pipeline’s pressure is brought to the appropriate pressure level for testing. APS does this by using what is called a “squeeze” pump.
When the pipeline reaches a good line fill, our APS technicians monitor your pipeline’s pressure. This is achieved through the use of monitoring equipment, including calibrated deadweights, digital gauges and recorders.
After testing has been completed to industry standards, APS begins the process of depressurizing your pipelines. The depressuring process is carefully done to ensure the safety of the pipeline. In addition, this process is necessary to maintain compliance with industry code and standards.
What is Pipeline Integrity Testing?
Pipeline integrity testing refers to various processes, hydrostatic testing, used to test the structural integrity of a pipe.
Hydrostatic testing is used to test certain pressure vessels, such as plumbing systems or pipelines. This test aims to examine the strength of a vessel, which is a pipeline in this context. Through hydrostatic testing, you can determine the overall operational fitness of your pipeline. In addition, hydrostatic testing allows you to identify leaks in your pipeline. Because of this leak detection capability, hydrostatic testing is an important process to utilize when testing your pipes.
One scenario where hydrostatic testing is necessary is when you install a new pipeline. Once you’ve installed a new pipeline, you are sometimes required to undergo hydrostatic testing to test your pipe’s integrity.
When it comes to the testing of existing pipelines, integrity testing is required for certain asset owners. Let’s say you’re the owner of a natural gas company, and you transport your gas through pipeline systems. In this scenario, you would be required to test your pipelines every 3-5 years. The frequency of this testing depends on where your pipes are located.
Why Pipeline Integrity Testing Matters
Pipeline integrity testing plays a critical role in ensuring the safe and efficient operation of pipeline systems across various industries. From water and wastewater systems to high-pressure energy pipelines, proactive testing helps detect weaknesses or defects before they lead to costly failures. By simulating operational pressures or flow conditions, integrity testing allows operators to validate the pipeline’s structural strength and identify vulnerabilities early.
The main purpose of this testing is fourfold: to ensure safety, maintain operational efficiency, meet regulatory compliance, and extend the service life of assets. Preventing pipeline ruptures or leaks safeguards people, the environment, and property. At the same time, consistent testing reduces the likelihood of unexpected downtime and maintains optimal flow. In many industries, testing is also required to comply with safety standards and regulatory frameworks. Over time, routine integrity testing helps asset managers make informed maintenance decisions and preserve the long-term health of pipeline infrastructure.
Common Signs Your Pipeline Needs Integrity Testing
Even if your pipeline is functioning now, certain warning signs indicate that integrity testing is overdue. Ignoring these early indicators can lead to costly breakdowns, non-compliance, and safety hazards. If you’ve noticed any of the following, it’s time to schedule an inspection:
Unexplained pressure drops or reduced flow rates: These could point to hidden leaks or internal damage.
Visible signs of wear or corrosion: Joint leaks, rust, or degradation on the exterior of the pipeline may suggest internal weakness.
Environmental or structural disturbances: Ground shifts from nearby construction, floods, or earthquakes can compromise pipeline stability.
Missed testing deadlines: If it’s been more than 3–5 years since your last integrity test, you may be out of compliance with industry regulations.
Regular testing helps catch minor issues before they escalate — and ensures your operation stays efficient, safe, and compliant.
Our Pipeline Integrity Testing Methods
APS evaluates each project's testing requirements, pipeline configuration, and operating conditions before recommending an appropriate approach. Different methods provide different information, making proper selection essential for reliable results.
Hydrostatic Pipeline Testing
Hydrostatic testing evaluates pipeline strength and leak-tightness by filling an isolated section with water and increasing the pressure to a specified test level.
APS uses high-flow pumps for controlled filling, pressure pumps for pressurization, and calibrated instrumentation to monitor test conditions. Technicians observe pressure behavior throughout the required test period and document results against established acceptance criteria.
The procedure is frequently used for newly constructed pipelines, major modifications, and qualifying existing pipeline assessments.
A properly planned hydrostatic test accounts for pipe construction, test pressure, water temperature, air removal, hold time, and safe depressurization.
Pipeline Inspection And Condition Analysis
Pressure testing provides important evidence about containment performance, but it does not identify every form of deterioration.
Pipeline inspection and condition analysis can provide additional information about corrosion, wall loss, structural weaknesses, and other potential integrity concerns.
APS evaluates pipe construction, accessibility, internal conditions, and inspection objectives to determine which technologies are suitable. The resulting information helps operators prioritize maintenance, investigate defects, and develop longer-term integrity plans.
Smart Pigging And Inline Inspection
Smart pigging, also called inline inspection or ILI, uses instrumented tools that travel through a pipeline and collect information about its condition.
Depending on tool capabilities, inspection technologies may include magnetic flux leakage, ultrasonic testing, electromagnetic sensors, and geometry measurement systems.
These methods can identify certain metal loss, corrosion, wall thickness, and deformation concerns that pressure testing alone cannot characterize.
APS supports smart pigging services, including inspection preparation, tool selection, field execution, tracking, and condition analysis.
Additional Pressure And Leak Testing Methods
Some pipelines require testing methods beyond conventional hydrostatic procedures. Nitrogen pressure testing may be appropriate for certain moisture-sensitive systems, while acoustic inspection can help identify potential leakage under suitable operating conditions.
The correct method depends on pipeline design, previous service, accessibility, operating restrictions, and required test objectives.
APS reviews these factors to help clients choose an appropriate testing and inspection strategy.
What Pipelines Can be Tested?
Pipeline integrity testing can be performed in any type of pipeline. Examples of these types of pipelines include:
PVC
Cast iron
Ductile iron
PVC
Steel
HDPE
APS has experience performing integrity testing in numerous types of pipeline systems. These pipeline systems include:
New gas pipeline systems
New water pipeline systems
Natural gas pipelines
Water or wastewater lines
This is by no means an exhaustive list. Customers are welcome to contact the APS team to find an appropriate integrity testing solution for their pipelines.
How APS Performs Pipeline Integrity Testing
Successful integrity testing begins before the pipeline is pressurized. APS follows a structured field process focused on preparation, controlled execution, monitoring, and documentation.
The following workflow describes a typical hydrostatic testing project. Inspection-based assessments are planned according to their specific technologies and requirements.
Step 1: Pipeline Review And Test Planning
APS begins by reviewing the pipeline's diameter, length, construction, operating pressure, available access points, and project specifications.
Our team identifies isolation requirements, test boundaries, potential safety concerns, and the equipment needed to complete the work. This preparation helps establish appropriate testing conditions and reduces avoidable delays.
Step 2: Pipeline Preparation And Isolation
Before testing, the pipeline must be properly isolated and prepared for controlled filling and pressurization.
Depending on the project, preparation may include cleaning, gauging, flushing, and verification of valves and connections. Removing debris and trapped air helps establish suitable test conditions and improves pressure monitoring.
APS can coordinate pipeline cleaning services with testing when deposits, construction debris, or internal restrictions require attention.
Step 3: Controlled Filling And Pressurization
APS uses high-flow pumps to fill the selected pipeline section and appropriate pressure pumps to bring the system to the required test pressure.
Technicians monitor the process with calibrated deadweights, digital pressure gauges, and recording equipment. Pressurization follows project-specific procedures designed to protect personnel and pipeline infrastructure.
Step 4: Pressure Monitoring And Test Verification
Once the required conditions are established, the pipeline undergoes the specified test period.
APS monitors pressure behavior and relevant operating conditions while checking results against the applicable acceptance criteria. Temperature changes, trapped air, instrumentation issues, and leakage can all influence readings and must be considered during evaluation.
If the results indicate a potential problem, additional investigation may be required before the pipeline is accepted.
Step 5: Depressurization And Final Documentation
Following testing, APS carefully depressurizes the pipeline and coordinates water handling, dewatering, or drying when required.
Test records provide documentation of the procedure, observed conditions, and results. This information helps clients complete project closeout requirements and determine whether further inspection or corrective work is necessary.
When Does Your Pipeline Need Integrity Testing?
Integrity testing is important during new construction, after certain repairs, and throughout the operating life of a pipeline when conditions or applicable requirements call for assessment.
Common reasons for scheduling pipeline integrity testing include:
New pipeline installation before commissioning
Major repairs, replacements, or system modifications
Suspected leakage or unexplained pressure loss
Corrosion, wall deterioration, or structural concerns
Changes in operating conditions or intended service
Integrity management and regulatory assessment requirements
Unexplained pressure changes should not automatically be treated as evidence of structural failure. Equipment issues, operational changes, and other factors can produce similar symptoms.
The appropriate response depends on the system's condition and the potential consequences of failure. For new infrastructure, testing may also be coordinated with pipeline pre-commissioning activities to confirm readiness before operation.
Pipeline Integrity Testing For Different Industries
American Pipeline Solutions supports pipeline owners across municipal, industrial, utility, and energy sectors. Our testing approach considers each industry's operating conditions, infrastructure requirements, and potential failure consequences.
Municipal Water Mains
Municipal water transmission and distribution systems are essential to public health and daily operations. Aging water mains, joint deterioration, corrosion, and pressure fluctuations can affect system reliability.
APS provides pipeline integrity testing and related inspection support for municipal water infrastructure. These services help utilities evaluate pressure containment, investigate suspected weaknesses, and support water main rehabilitation or replacement planning.
Our experience with pipeline inspection and condition analysis also helps owners determine when pressure testing should be supplemented by a more detailed evaluation of pipeline condition.
Wastewater And Force Mains
Wastewater force mains operate under pressure and can experience challenging conditions, including internal corrosion, sediment buildup, hydraulic fluctuations, and limited access.
Failures can cause environmental releases, service interruptions, and expensive emergency repairs. Integrity testing helps utilities evaluate pressure performance and identify circumstances that require further investigation.
APS supports wastewater operators with pipeline testing, cleaning, inspection preparation, and maintenance services tailored to system conditions.
Industrial And Utility Pipelines
Industrial facilities depend on reliable pipelines for process water, cooling systems, utility distribution, and other critical operations.
APS supports pressure testing and pipeline assessment during facility upgrades, equipment changes, scheduled shutdowns, and new installations.
Our team works with facility operators and project contractors to plan testing around operating restrictions, access limitations, and commissioning schedules.
Oil And Gas Pipelines
Natural gas, crude oil, and refined product pipelines require careful integrity management due to operating pressures and potential safety or environmental consequences.
APS supports hydrostatic testing, pipeline inspection preparation, smart pigging, and related services for suitable energy pipeline projects.
Testing methods and assessment intervals are selected according to pipeline characteristics, operator requirements, and applicable regulations, including relevant U.S. Department of Transportation pipeline safety rules.
Safety And Compliance During Pipeline Integrity Testing
Pipeline pressure testing requires careful planning because stored energy, pressurized water, temporary connections, and equipment failures can create serious hazards.
APS prioritizes controlled pressurization, suitable test boundaries, calibrated monitoring equipment, safe isolation, and disciplined depressurization.
Testing requirements vary by pipeline type and intended service. Municipal water systems may be subject to applicable AWWA standards and project specifications, while regulated energy pipelines may fall under PHMSA requirements and relevant engineering codes.
APS works within the applicable project requirements to support safe field execution and reliable documentation.
Why Choose American Pipeline Solutions?
American Pipeline Solutions combines decades of industry experience with comprehensive pipeline testing, cleaning, inspection, and maintenance capabilities.
As a member of the Pigging Products & Services Association (PPSA), APS maintains a strong focus on professional field practices, technical capability, and dependable project execution.
Our service approach provides several advantages:
Nationwide pipeline testing and field support
Experienced technicians and specialized testing equipment
Hydrostatic testing and complementary inspection capabilities
Integrated cleaning, pigging, dewatering, and commissioning support
Practical planning for municipal, industrial, and energy projects
APS understands that testing is often one stage of a larger pipeline project. Our team helps coordinate preparation, execution, and follow-up work so clients can move forward with greater confidence.
FAQs:
What is pipeline integrity testing?
Pipeline integrity testing is the process of evaluating whether a pipeline can safely operate at its intended pressure and conditions. It typically involves methods like hydrostatic testing, inline inspection (ILI), or direct assessment to verify structural strength, identify leaks, and detect corrosion or defects. The goal is to confirm that the line is fit for service and compliant with applicable standards.
How does hydrostatic testing work for pipeline integrity?
In hydrostatic testing, the pipeline is filled with water and pressurized above its normal operating pressure using high-flow and “squeeze” pumps. Technicians then monitor the pressure using calibrated deadweights, digital gauges, and recorders over a defined test period. Any pressure loss or visible leakage indicates a potential defect. After the test, the line is carefully depressurized to protect the asset and maintain code compliance.
When should a pipeline be integrity tested?
New pipelines are often required to undergo hydrostatic testing before being placed into service to verify strength and leak-tightness. Existing pipelines are typically tested on a recurring schedule based on product type, location, and regulatory requirements—commonly every 3–5 years for certain natural gas systems. Testing may also be triggered by operational changes, suspected damage, or missed inspection intervals.
What are common signs that my pipeline needs integrity testing?
Unexplained pressure drops, reduced flow rates, or unstable operating conditions can signal internal damage or leaks. Visible corrosion, joint leaks, or external rust may point to underlying structural weakness. Ground movement from construction, flooding, or seismic activity, along with overdue inspection intervals, are strong indicators that integrity testing should be scheduled as soon as possible.
What types of pipelines can be hydrostatically tested?
Hydrostatic testing can be applied to a wide range of materials, including PVC, cast iron, ductile iron, steel, and HDPE. It’s used on new and existing systems such as gas pipelines, water mains, and wastewater lines. The specific procedure is tailored to the pipe material, diameter, operating conditions, and applicable codes.
How is hydrostatic testing different from inline inspection (ILI)?
Hydrostatic testing pressurizes the pipeline with water to confirm strength and leak-tightness at or above a target pressure. Inline inspection (or smart pigging) uses internal tools equipped with sensors—such as ultrasonic or magnetic flux leakage technology—to detect wall loss, corrosion, and geometric defects while the line is in service. In many integrity programs, both methods are used together: hydrotesting to prove pressure containment and ILI to map and monitor defects over time.
Why is pipeline integrity testing important for safety and compliance?
Integrity testing helps prevent pipeline failures that could harm people, the environment, and property. By simulating operational or elevated pressures and recording system response, operators can verify that the pipeline meets design and regulatory requirements. Regular testing also supports compliance with industry codes, reduces unplanned downtime, and provides documented evidence for audits and integrity management plans.
What other methods are used besides hydrostatic testing?
Beyond hydrostatic testing, operators may use inline inspection (smart pigs), direct assessment, ultrasonic testing (UT), magnetic flux leakage (MFL), and acoustic emission monitoring. These methods can detect corrosion, metal loss, cracks, and other anomalies without permanently altering the line. The right combination depends on pipeline design, accessibility, regulatory requirements, and whether the system can accommodate internal tools.
How often should natural gas pipelines be integrity tested?
For many natural gas transmission systems, integrity assessments are required on a recurring basis, often every 3–5 years, depending on class location, operating pressure, and regulatory frameworks. If conditions change—such as population growth near the right-of-way, construction activity, or evidence of corrosion—more frequent testing or additional assessment methods may be needed.
Can APS help determine the right integrity testing method for my pipeline?
Yes. APS evaluates pipeline material, age, location, operating conditions, and regulatory obligations to recommend an appropriate integrity testing approach. That may include hydrostatic testing, inline inspection support, or complementary techniques. The objective is to select methods that verify structural integrity, support compliance, and minimize downtime for your specific system.
Want to learn how pipeline integrity testing can benefit your pipeline systems?
Contact the team at American Pipeline Solutions today to find the best solution for your needs.
