124 In the case of breakage, etc., you can easily check a leakage area with double contained pipes. Fluid to scatter to outside can be prevented. Safety Measure Environment Preservation It is to prevent leakage to the floor surface, etc. by preventing leakage of hazardous materials from piping, etc. or checking any leakage easily. Because of this, it shall be a material/structure required for prevention of leakage from piping, etc. or a piping layout that is easy to check any leakage visually. In both cases, it shall be that any abnormality or leakage can be easily checked visually in regular inspections. Piping, etc. includes the piping main unit, fittings, flanges, valves and pump equipment where water containing hazardous materials would flow. Double Contained Pipe ■ Overview ■ Revisions of the Water Pollution Prevention Act Double contained pipes are products of inner pipe (actual pipe) and outer pipe (protection pipe) combined together. With this structure, even if liquid leaks due to breakage of the inner pipe, the fluid is received by the outer pipe and scattering or leakage to outside can be prevented. You can identify a leakage directly and recover immediately by using transparent PVC pipe for outer pipe. Double contained pipes are effective for safety and environmental measures. Law to revise part of the Water Pollution Prevention Act was enacted on June 14, 2011, promulgated on June 22, 2011, and enforced on June 1, 2012. Based on this law, new regulations are added to this Act to regulate the installers of facilities using and storing hazardous substances (*1) to follow the standard for structure, equipment and use method of underground penetration prevention, conduct regular inspections, and keep records of the results. (*1) Hazardous substances subject to the regulations are in total of 28 items (as of June 2013) regulated in Article 2 of the Ordinance of Water Pollution Act such as cadmium, lead and trichloroethylene. ■ Measures (Effective Use of Double Contained Pipe) Piping, etc. accompanied with the facility itself (Above ground facilities) - Creation of a System Effective for Prevention of Underground Water Contamination in Advance -(Enforcement date on June 1, 2012) Double Contained Pipe