Final Decision to Certify Hazardous Waste Environmental Technologies
Double Containment Piping and Associated Fittings
Note: This certification expired on July 25, 1997
The following is excerpted from:
CALIFORNIA REGULATORY NOTICE REGISTER
The California Environmental Protection Agency, Department of Toxic Substances Control (Department) has made a final decision to certify the following company's hazardous waste environmental technology listed below:
A new law effective January 1, 1994 (Chapter 412, Statutes of 1993, Section 25200.1.5., Health and Safety Code, enacted by Assembly Bill 2060, Weggeland), authorized the Department to certify the performance of hazardous waste environmental technologies. Only technologies that are determined to not pose a significant potential hazard to the public health and safety or to the environment when used under specified operating conditions and which can be operated without specialized training and with minimal maintenance may be certified. Incineration technologies are explicitly excluded from the certification program.
The purpose of the certification program is to provide an in-depth, independent review of technologies at the manufacturers level to facilitate regulatory and end-user acceptance and to promote and foster growth of California's environmental technology industry.
The Department makes no express or implied warranties as to the performance of the manufacturer's product or equipment. The end-user is solely responsible for complying with the applicable federal, state, and local regulatory requirements. Certification does not limit the Department's authority to require additional measures for protection of public health and the environment.
By accepting certification, the manufacturer assumes, for the duration of certification, responsibility for maintaining the quality of the manufactured equipment and materials at a level equal to or better than was provided to obtain certification and agrees to be subject to quality monitoring by the Department as required by the statute under which certification is granted.
DTSC's notice to certify was published in the California Regulatory Notice Register Volume 94, No. 25-Z. The DTSC's final certification shall be effective from July 25, 1994 to July 25, 1997.
Additional information supporting DTSC's final certification decisions is available from:
A description of the technology to be certified, the final certification statement and the certification limitations for the technology follows:
The Poly-Flowlines Company manufactures double-containment pipes and associated fittings for carrying hazardous wastes or hazardous substances. The secondary pipe is intended to reduce the risk of harm to public health and the environment if the primary pipe should fail. The pipes and fittings are patented and have a unitary construction with integral ribs connecting the inner and outer walls. The piping and associated fittings are designed to accommodate a wide range of leak detection sensors, which can be installed to automatically detect and monitor a leak from the primary pipe. The pipes and fittings are joined, using the applicant's AutoWeld 400 that fusion-welds the inner and outer walls simultaneously. These pipes are also available with flange fittings without compromising their double-containment attribute. The pipes and fittings are made of thermoplastic materials, polypropylene or polyvinylidene fluoride, that have been shown to be resistant to a wide range of chemicals.
The Poly-Flowlines Company's double-containment piping system is hereby certified by the California Department of Toxic Substances Control (Department) as a Hazardous Waste Management technology when: 1) used in conjunction with a leak detection and monitoring system; and 2) selected, designed, installed, operated, monitored, and maintained according to the manufacturer's standards and specifications. This certification is specific to the use of double-containment pipe as a means of providing secondary containment for gravity drain and vent piping systems for hazardous wastes or hazardous substances that are compatible with the construction material of the pipe. The double-containment piping system can be effective for containing an uncontrolled release of hazardous waste or hazardous substance from the primary pipe.
Article 10 of Chapters 14 and 15, Division 4.5, Title 22, California Code of Regulations require secondary containment for ancillary equipment, such as a pipe. The secondary containment must include two components: 1) a secondary containment suitable to contain a release from the primary pipe; and 2) a leak detection and monitoring system to detect the release from the primary containment. The applicant's double-containment piping system provides one component of the secondary containment. The Department recognizes that there are several off-the-shelf leak detection and monitoring systems that can be installed with the double-containment piping system to detect a release from the primary pipe. Therefore when selected, designed, installed, operated, and maintained according to the manufacturer's specifications, the Poly Flowlines' double-containment pipe in conjunction with an appropriate leak detection and monitoring system can meet the current requirements set fourth in Sections 66264.193(f) and 66265.193(f) of Title 22, California Code of Regulations.
The Department makes no express or implied warranties as to the performance of Poly-Flowlines Company's product or equipment. Nor does the Department warrant that the Poly-Flowlines Company's products are free from any defects in workmanship or material caused by negligence, misuse, accident or other causes.
The Department does believe, however, that the manufacturer's product can achieve the performance levels set out in this certification. Said belief is based on a review of the data submitted by the manufacturer and interviews with end-users of the equipment when the product or equipment was used in accordance with manufacturer's specifications.
This certification is issued as part of the pilot project for the California Hazardous Waste Environmental Technology Certification Program. The purpose of the pilot project is to delineate the practical aspects of the program that will adopted in regulations which are under development. Consequently, this certification may be subject to the conditions which will be required in these regulations, including but not limited to the duration of a certification, the continuous monitoring and oversight requirements, and the certification amendment procedures, including decertification.
The end-user is solely responsible for complying with the applicable federal, state, and local regulatory requirements; the manufacturer's selection, design, installation, and monitoring specifications; and the established industry practices when using the double-containment piping system. This certification does not limit the Department's authority to require additional measures beyond the current regulatory requirements that would be protective of the public health and the environment.
The Department reviewed Poly-Flowlines Company's 1994 catalog that contains detailed information as to how these pipes and fittings can be assembled to install a leak detection and monitoring system, including the specification, design, engineering, and chemical compatibility data of the double-containment pipe. Further, the Department reviewed the efficacy of the double-containment pipe including its leak detection and monitoring system in complying with current secondary containment requirements (Sections 66264.193(f) and 66265.193(f) of Title 22, California Code of Regulations) for ancillary equipment, such as a pipe. Based on this review, the Department concludes that the double-containment pipe in conjunction with a leak detection and monitoring system does meet the secondary containment requirements as of the date of this certification.
The double-containment pipe and fittings are extruded with polypropylene copolymer or polyvinylidene fluoride polymer. These polymers have been shown to be compatible with a range of chemicals according to the literature of Hoechst-Celanese and Solvay Polymers, the polymer manufacturers, supplied to the Department by the applicant.
The Department conducted telephone interviews with five end-users who selected and used the double-containment pipe system(s) to contain a leak should the primary pipe fail. All but one of the end-users contacted did use a leak detection and monitoring system with their double-containment piping systems. The Department found that the end-users were satisfied with the performance of the double-containment piping system. None of the end-users had had an uncontrolled release of the hazardous waste or hazardous substance to the environment from the respective piping systems. The contacted end-users' experience ranged from a few months to over five years. The contacted end-users selected the double-containment pipes for a variety of reasons, such as cost effectiveness when compared to a pipe-in-a-pipe configuration, improved reliability of containing a release if the primary pipe leaks, compatibility of the fluid(s) being transported, and the quality of the fusion-weld. The end-users used the double-containment pipe for a wide range of services, ranging from a highly acidic service in a semi-conductor industry to industrial waste streams at a Department of Defense installation in California.
The Department representative also visited the Poly-Flowlines Company's production facility, located at 15392 Cobalt Street, Sylmar, California 91342, to observe how the double-containment wall piping components are manufactured and how the Autoweld 400 fusion-welding system operates.
The Poly-Flowlines Company manufactures the double-containment pipes and fittings of 1", 2", and 4" diameters (primary pipe) using thermoplastic materials, polypropylene copolymer or polyvinylidene fluoride polymer. The manufacturer uses the same material of construction for both the primary and secondary pipes and engineers identical wall thickness for the inner and outer pipes.
Several types of leak sensing instruments, such as float switches, optical probes, pressure switches and conductive probes, can be installed in the annular space of the double-containment pipe. The manufacturer's catalog provides detailed assembly instructions for installing leak detection and monitoring instruments onto the double-containment piping system. The catalog also includes detailed specifications for the pipes and fittings, piping design suggestions, a chemical resistance guide, engineering data, leak detection instrument installation procedures, and pipe fusion-welding protocols. The company exclusively relies on the end-users to determine the suitability of the Poly Flowlines products for their specific applications and to be responsible for complying with all applicable laws and regulations.
Requirement for Continued Quality Assurance
By accepting certification, the manufacturer assumes, for the duration of this certification, responsibility for maintaining the quality of the manufactured equipment and materials at a level equal or better than was provided to obtain this certification and agrees to be subject to quality monitoring by the Department as required by the law under which this certification is granted.
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File last updated: October 31, 1996