FAQs
Flex-Protex Products
Where can it be used?
Various types of concrete pipe using steel joint rings with o-ring seals.
Can it be used for sub-aqueous and jacked tunnel pipe?
Yes – for these installations, poured grout is not possible.
Is the installation of the “Flex-Protex” ring possible under various weather conditions?
Yes – Rain, wet ditches will not affect the installation of the pipe.
How does it protect the steel from corrosion?
The “Flex-Protex” joint fillers have no less than 63% Portland cement. After installation the Portland cement hydrates, providing the alkaline environment that prevents corrosion of the steel rings.
Will the installation affect early settlement of the pipeline?
Unlike a poured joint, it will remain flexible for a time period much in excess of a poured mortar joint.
Is the cost competitive with alternative methods of joint protection?
Yes – The installation is similar to that of an o-ring. Also, diapers and the field preparation of grout are eliminated. In addition, immediate back filling of the pipeline is possible.
Intumescent Products
Which intumescent products expand at a lower temperature? The graphite or non-graphite based?
The non-graphite based products will begin to expand at lower temperatures. Generally they start at 250°F (122°C). The graphite based products start expanding at about 350°F (177°C.)
Which products will generate more volume during expansion at temperatures over 500°F (260°C).
The graphite based products will produce greater free expansion volumes over 500°F
At what temperature will the graphite based products stop expanding?
The graphite based products will expand when exposed to temperatures up to 900°F or 1652°F
Which products exert more pressure while expanding?
The graphite-based products typically create greater pressure at higher temperatures.
When a graphite material expands in a confined area what happens?
Typically, if there is Intumescent material to completely fill an area it will continually expand and compacting to form a dense barrier.