Secondary Containment:
From A Contractors Point of View
Secondary Containment:
Advances in Technology
Last 10 years
What is Secondary
Containment:
Primary (Tanks) vs Secondary
(Undertank Liners or Dikes)
The Original Secondary
Containment
Types of Advances
•
•
•
•
Materials
Seaming Equipment
Testing Equipment
Technician Training
Materials
• HDPE (High Density Polyethylene)
• Alloys (XR-5, 1932 PTF (polyurethanes)
• GCL’s (Geosynthetic Clay LinersBentomat, No longer making Claymax)
• Others (Concrete Canvas, Spray Appliedpoly-ureas,etc)
HDPE
• Advances in resins?
• Initial resins were pipe grade (not flexible)
• Resins over last 10 years have been
improved to be more flexible and chemical
resistant
• Wide flat dies on extruder as opposed to
blown film
Alloys
•
•
•
•
•
•
XR-5
Manufactured in wider rolls
Less seaming
Embed is now available
Improved Walkway material available
Polyurethanes (1932 PTF)
GCL’s
• Claymax-Original GCL, no longer produced
• Newer GCL’s
• Bentomat 200R-Needle punched to prevent
migration of bentonite granules
• Bentomat CL-Layer of membrane on back
• Aqua Shield-Layer of membrane, Pond
usage, etc
Others
•
•
•
•
•
•
CONCRETE CANVAS
Concrete still not considered impermeable liner
Product has it’s uses
Cover over membrane
Small dike area, etc.
SPRAY APPLIED (better spray equipment, robot
spray equipment now available, Factory sheets
shipped to site, less field seaming)
• Polyurea’s etc.
Seaming Equipment
• Fusion Welders(faster-15’ per foot easy,
lighter, smarter)
• Extrusion Welders (Alloy extrusion
welding, HDPE-faster-6-9’ easy,lighter)
Testing Equipment
• Vacuum Box
• Air Channel
• Air Lance
Temporary Containment
Temporary Dikes
•
•
•
•
Extruded Products readily available
Larger dikes now available
Materials can be cleaned & re-used
Other quick systems(metal with liner, etc)
Technician Training
• Great strides in training of personnel
IAGI (International Association of
Geosynthetic Installers)
FML Manufacturers approval and
certification available
Installer training (reputable installers)
• FML Inspector Certification available(GAI)
PLS Crack FML
Inspector
Completed Secondary Containment
Liner