Choose a geomembrane for an oil and gas project from the actual fluid mixture, temperature, contact duration and containment duty. HDPE, LLDPE and specialized formulated membranes require product-specific evidence. A generic chemical-resistance chart, carbon-black percentage or GRI-GM13 declaration does not prove zero leakage, resistance to every hydrocarbon or a guaranteed service life.
Define what the liner must contain
Distinguish continuous primary containment, produced-water storage, drilling-fluid pits and secondary spill containment. A liner exposed to liquid continuously may face different requirements from one intended to retain a spill until cleanup. Include startup, upset, cleaning and empty-pond conditions.
| Information to provide | Selection consequence |
|---|---|
| Fluid composition | Identify hydrocarbons, salts, dissolved constituents, surfactants, biocides and other additives. |
| Concentration and units | State mass fraction, mg/L or another defined basis; do not substitute pH for composition. |
| Temperature and duration | Identify continuous exposure and credible short-term peaks. |
| Geometry and foundation | Address settlement, uplift, corners, anchors and pipe details. |
| Exposure and loading | Review UV, weather, cleaning, cover and equipment contact. |
| Acceptance basis | Identify applicable permits, design requirements, test program and approval responsibility. |
Concentration example: 200,000 mg/L is 200 g/L. It is not automatically 20% by mass. If the measured solution density were 1.15 kg/L, the corresponding mass fraction would be 200 ÷ 1,150 × 100 ≈ 17.4%. The density is an assumed calculation input here. For concentrated produced water, mg/L and ppm by mass should not be silently treated as equal.
Compare specific products rather than polymer rankings
HDPE may be appropriate for a proposed containment duty, but hydrocarbons can interact with polymers through sorption, diffusion and changes in properties. Absence of visible swelling does not prove absence of permeation. LLDPE’s conformability can be useful for some geometries, but it is not a substitute for chemical and strain assessment.
Flexible PVC and reinforced or alloy membranes must be evaluated by their exact formulation and application limits. Do not infer that all PVC is prohibited, that all reinforced membranes have the same fuel resistance, or that one named polymer always performs several times better than another. Compare reports using the same liquid, temperature, duration, thickness and evaluation methods.
See HDPE geomembrane options and LLDPE geomembrane options for the offered products. An offer should identify any requirement for which compatibility has not yet been established.
Use a chemical-compatibility program with agreed acceptance criteria
ASTM D5747/D5747M addresses testing and reporting for chemical-resistance assessment of geomembranes. It does not itself supply a universal pass/fail percentage or a field-life prediction. Laboratory immersion procedures are addressed separately by ASTM D5322. EPA Method 9090A is another relevant reference where specified.
- Identify the exact sheet formulation, surface, thickness, seams and other exposed components.
- Select representative fluids and credible worst-case conditions with the project reviewer.
- Define exposure temperatures, durations, controls, replicate sampling and measurements.
- Agree which changes are acceptable before testing; do not choose thresholds after seeing the results.
- Review physical changes, mechanical retention and relevant permeation or durability evidence together.
- Record acceptance, rejection or unresolved limitations for the specific duty.
Mass-change percentage is (exposed mass − initial mass) ÷ initial mass × 100. A positive value can indicate uptake, while a negative value can indicate loss of constituents; conditioning and the test procedure also matter. A change alone does not identify the chemical mechanism. Strength retention is exposed strength ÷ unexposed strength × 100, using comparable specimens and test conditions.
Separate thickness, permeability and installed leakage
State thickness in the contract’s governing units. 60 mil = 1.524 mm; 100 mil = 2.54 mm. Selection also depends on loads, support, durability and details. Greater thickness cannot by itself make an incompatible formulation acceptable or eliminate leakage through a damaged joint.
A diffusion coefficient in m²/s, hydraulic conductivity in m/s and permeation flux in g/m²/day describe different quantities. Do not compare their numerical values directly or use them to promise zero leakage from the complete installation. A test for water-vapor transmission cannot automatically establish resistance to benzene or a mixed fuel.
Assess groundwater uplift, gas accumulation, unsupported transitions and concentrated loads before choosing the protection system. Geotextile cushioning must be matched to contact materials and load conditions; nominal GSM alone does not establish protection against a specific aggregate.
Understand what manufacturing tests establish
GRI-GM13 addresses HDPE manufacturing quality, while project compatibility and installed containment need additional evidence. Carbon black, stress-crack resistance and OIT results should be traceable to the offered formulation. They are not an oil-service certification.
OIT is measured under specified laboratory conditions. Standard and high-pressure results are not interchangeable, and ASTM D8117 cautions about extrapolating OIT to life expectancy. A retention percentage should not be relabeled “percentage of service life remaining.”
Specify the complete secondary-containment system
For US facilities subject to the relevant SPCC provisions, EPA explains secondary-containment capacity requirements, including the largest single bulk-storage container and sufficient precipitation freeboard where applicable. This is a system requirement, not approval of a particular liner brand or thickness. The facility’s applicable rules, permit and approved plan control.
Include berms, walls, penetrations, drains and cleanup access in the review. Confirm that the chosen material can perform for the anticipated contact period and cleanup conditions. Do not use a generic 110% volume rule as a substitute for the applicable capacity and rainfall assessment.
Require installation records and an operating inspection plan
Approve seam procedures and trial welds for the material and field conditions. Document nondestructive continuity checks, destructive seam-strength tests where specified, repairs and retests. Select leak-location methods appropriate to the installed layer arrangement. A seam test does not prove chemical compatibility, and an immersion test does not prove installation integrity.
Define inspections after spills, maintenance or unusual loading, together with routine checks required by the operating plan. Record liquid removal, liner condition, drainage and repairs. Access to contaminated areas and repair procedures must follow the site’s safety and operating requirements.
Send the fluid analysis, temperature envelope, drawings and specification to Jinseed for a product and quotation review. Clearly identify pending compatibility work before material approval or procurement.
