Pipeline & Tank Hydrotest Water Remediation & Treatment
The National Leader for On-Site Pipeline Hydrotest Water Treatment
Envent Corporation is the premier national provider of on-site water treatment solutions for pipeline hydrostatic testing within the petrochemical, refining, and midstream sectors. We specialize in the complex remediation required to convert contaminated test water into permit-compliant discharge.
As the operator of the largest mobile water treatment fleet in North America, Envent delivers engineered systems designed to remove specific contaminants while adhering to strict discharge permit requirements for water quality, volume, and flow velocity. Since 1992, we have provided the technical expertise necessary to manage the environmental risks associated with high-volume hydrotest water disposal.
Turnkey Hydrostatic Test Water Remediation Services
Every pipeline and tank hydrotest project presents unique chemical profiles and volume challenges. Envent’s hydrotest water treatment services cover the entire project lifecycle from initial permitting to final discharge reporting. Our engineers design site-specific treatment trains that address:
- Contaminant Removal
Targeted extraction of hydrocarbons, heavy metals, suspended solids, and chemical additives. - Advanced Technology Integration
Utilization of Dissolved Air Flotation (DAF) units, air strippers, oil/water separators, and particulate filtration. - Specialised Media Management
Expert loading and extraction of activated carbon, zeolite, and organoclay media to reach non-detect levels. - Operational Accountability
Comprehensive system setup, 24/7 onsite operation, media disposal, and real-time discharge monitoring.
Comprehensive Contaminant Mitigation & Media Chemistry
- Hydrocarbon & BTEX Polishing
We use high-grade, virgin coconut shell activated carbon to remove Benzene, Toluene, Ethylbenzene, and Xylene to non-detect levels, meeting the strictest municipal and federal discharge limits. - Heavy Metal Sequestration
For legacy pipelines or sour service tanks, we employ specialized Zeolite and Ion-Exchange resins to target and capture dissolved lead, chrome, and copper. - Emulsified Oil Separation
When standard gravity separation is insufficient, our Advanced Oil/Water Separators and DAF (Dissolved Air Flotation) units break down stable emulsions, removing free-phase and dispersed oils before they reach the polishing stage. - Suspended Solids Management
Multi-stage bag and sand filtration units manage Total Suspended Solids (TSS), preventing downstream media fouling and verifying that the final effluent meets turbidity standards.
Strategic Permitting & Discharge Strategy
Navigating the regulatory landscape for NPDES discharge requires more than just clean water; it requires a defensible data trail. Envent acts as a technical liaison between the operator and regulatory agencies like the EPA, TCEQ, or ECCC.
- Permit Feasibility Analysis
We review your site-specific permit limits to determine the most cost-effective treatment flow, whether it involves discharging to a local waterway, a POTW, or reinjecting for future use. - Real-Time Data Capture
Our systems are equipped with digital flow meters and totalizers, providing an audit-ready log of exactly how much water was treated and at what velocity. - Batch vs. Continuous Flow
We offer the flexibility to manage large-volume “batch” treatments in temporary storage tanks or “continuous flow” remediation for high-diameter pipeline segments, optimizing your project timeline.
24/7 Mobilization & Regulatory Compliance Expertise
Envent provides mobilization for terminals, refineries, and pipeline stations. We bridge the gap between operational needs and environmental mandates by working directly with your environmental engineers to navigate the complexities of NPDES (National Pollutant Discharge Elimination System) and POTW (Publicly Owned Treatment Works) permitting.
Our team manages the critical path of your water treatment project:
- Permitting Support
Assisting with the acquisition of necessary discharge permits. - Technical Specification
Matching equipment to the exact chemical demands of your test water. - Analytical Verification
Coordinating with certified laboratories to verify that water quality meets all testing requirements. - Reporting
Filing precise discharge reports to maintain 100% regulatory transparency.
Engineering Support for High-Stakes Projects
For engineering firms and project managers, Envent serves as a technical partner rather than a simple equipment provider. We offer deep-tier support for researching equipment specifications and drafting Safe Work Plans and Operations Manuals. Our project managers prioritize safety and precision, allowing your team to focus on the integrity of the pipeline while we handle the complexities of the water cycle.
Beyond equipment mobilization, we provide specialized Front-End Engineering Design (FEED) support to verify your water management strategy is optimized for both cost and compliance. Our team assists in developing Piping and Instrumentation Diagrams (P&IDs) and site-specific layout plans that integrate seamlessly into refinery or terminal infrastructure. By providing data-backed media life-cycle projections and flow-rate analysis, we help project managers mitigate the risks of downtime or breakthrough, keeping high-volume hydrotests on schedule and under budget.
What Our Clients Say
Featured Case Studies
The Problem: A refinery needed to stop a mobile MTBE plume from spreading into the local water table. The project required a system to pull both groundwater and soil vapors at high vacuum to halt the plume’s migration.
What We Did: Envent deployed a Multi-Phase Extraction (MPE) system paired with a Mobile Thermal Oxidizer (EMTOS). This setup uses high-vacuum pumps to extract liquid and vapor, routing gases to the oxidizer for destruction at 1,400°F with 99.99% efficiency.
The Result: Since 2008, the system has halted the plume and kept the site in 100% compliance. By destroying toxins at the source, Envent continues to protect local groundwater with over 15 years of proven reliability.
The Problem: A manufacturer found a leak in a pressurized 12-inch propane pipeline. They needed to clear a 16-mile segment (12,000 barrels) fast, but flaring was banned due to strict emission rules and proximity to populated areas.
What We Did: Envent arrived within hours with a 20 MMBTU/hr Mobile Thermal Oxidizer (EMTOS) and dual vaporizers. We converted the liquid propane into vapor to fuel the oxidizer, destroying it at 1,600°F with 99.99% efficiency and zero visible flame.
The Result: The project was finished 4x faster than flaring, marking the fastest documented 16-mile degas in the U.S. We met all EPA standards with zero reportable emissions, allowing repairs to start ahead of schedule without community impact.
Pipeline & Tank Hydrotest Water Treatment: Frequently Asked Questions
What types of contaminants can Envent remove from hydrotest water?
Can Envent handle high-flow discharge for large-diameter pipelines?
Does Envent assist with NPDES or POTW permitting?
How do you verify the water is safe for discharge?
What is the difference between batch and continuous flow treatment?
Do you provide the filtration media and handle its disposal?
Yes. Our turnkey service includes the provision, loading, and extraction of all media such as activated carbon, zeolite, and organoclay. Once the project is complete, we manage the manifest and proper disposal of the spent media.
Can your equipment operate in tight facility footprints?
Our mobile and skid-mounted units are designed for rapid deployment and versatility. We can configure treatment trains to fit within the limited space available at refinery units, terminal racks, or narrow pipeline rights-of-way.
