There is no inference to tolerances for the listed approximate dimensions. For additional information, contact NPT Products. Many factors, such as chemical resistance, specific gravity, external stresses, product geometry, environment and many others affect the suitability of a particular product. This failure is not a result of chemical attack. These are set up during some molding and fabrication processes.
Environmental conditions can add tensile stress, particularly if the tank is inadequately supported.
Use of an FRP casing will minimize tensile stress from added load and further decrease the likelihood of environmental stress-cracking. Relatively small concentrations of stress-cracking agent may be sufficient to cause cracking. This varies from plastic to plastic depending on several characteristics of the molecular structure. PVDF also has excellent stress-crack resistance. Temperature effects are directly dependent on the characteristics of the plastic resin, specific gravity of tank content, tank size and configuration, exterior support and wall thickness of the tank.