Double-See® Double Containment

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This vinyl double containment piping system is fast and easy to install, and is available with a complete selection of pipe, fittings, and valves. Additionally, an innovative "valve-in-valve" design is offered which allows full containment pressure rating. Double-See® is available in PVC and CPVC; either material may be primary or secondary (PVC x PVC, CPVC x PVC, CPVC x CPVC) with Clear PVC always being an option for the containment pipe. System size options range from 1/2" x 2" to 6" x 10", meeting virtually any application requirement. Installation versatility allows simultaneous joining throughout a system or in combination with patented closure couplings which enable practical compliance with the ASME B31.3  requirement for visual inspection of all primary joint connections during the pressure test before closing the secondary piping joint.

Double containment piping systems are ideal for ensuring safety when transporting corrosive, toxic, or otherwise hazardous media.

When a leak from the primary pipeline occurs in a double containment system, the fluid is safely contained by the secondary pipe. End-users typically implement a leak detection system to alert operators when a leak has occurred.

These systems can be used in multiple applications, primarily for handling chemical and effluent water transfers.


Product Overview

Technical Data:

Size Range:

  • ½"- 6" inner pipe
  • 2" - 10" outer pipe

Pressure Rating:

  • Varies by Size (primary)
  • PN4 (50 PSI) (secondary)

Operating Temperature:

  • Varies by pipe

Joining Technology:

  • Solvent (Cement) Weld

Standard Ratings:

  • ASTM D1784
  • ASTM D1785
  • ASTM D2467
  • ASTM F441
  • ASTM F439
  • NSF 14
  • NSF 61

Materials:

  • Polyvinyl Chloride (PVC) Grey
  • Chlorinated Polyvinyl Chloride (CPVC)
  • Clear Polyvinyl Chloride (Clear PVC)

Fields of Application:

  • Water and Wastewater Treatment
  • Chemical Processing, Delivery and Dosing
  • Microelectronics
  • Metal Plating and Surface Finishing
  • Life Sciences

Advantages:

  • Revolutionary closure coupling design for practical compliance with ASME B31.4
  • Innovative centralizer design for thermal expansion compensation
  • Broad use of vinyl materials and ease of installation
  • Pipe cut-length guidance system for easy installation
  • Double containment installation is fast and easy
  • Factory assembled and 100% tested fittings
  • Extensive standard part selection
  • Customer fabrications and pipe spooling available
  • Provides for chemical and effluent water process transfers
  • Improves safety by eliminating chemical interaction with employees
  • Multiple leak detection options
  • Double-See can be applied in either above or below-ground applications

Specification

Double-See PVC Specification (See CPVC below)

PART 2 - PRODUCTS – MATERIALS

2.1 SECONDARY CONTAINED PROCESS PIPE AND FITTINGS SYSTEM (Above and Below Slab)

  1. PVC primary and secondary pipe and fittings for the double containment process piping systems installed below grade shall be Schedule 80 joined by the solvent cement joining method. Pipe and fittings shall be manufactured of polyvinyl chloride (PVC). Material shall safely convey flow streams up to 140° F (60° C) at a pressure rating of 150 PSI.
  2. All piping (primary and secondary) for this system shall be marked with the following “+GF+ PVC 1120 SCH. 80 (size) xxxx PSI WP @ 73F ASTM D1785 NSF-pw-U.P. Code-G (control #) Made in USA”.
  3. All fittings (primary and secondary components) shall be legibly marked showing GF Piping Systems LLC trademark, fitting size, manufacturers part number and symbol indicating the material.
  4. PVC centralizers will be designed with enough space for pass through of leak detection cable in the event the system is specified for same (in this event it is suggested the installer provide a “pull” line in all pipe lengths and fittings for ease of cable installation within the interstitial space once the system is in place)..
  5. Any custom fittings which may need to be fabricated due to field conditions or requirements of horizontal and/or vertical dimensioning shall conform to the standards of this specification. Only custom fittings manufactured by GF Piping Systems LLC shall be acceptable for installation within the system. All valve and flange boxes required to suit project conditions shall be as catalogued and manufactured by GF Piping Systems LLC.
  6. System shall be Double-See®  PVC double containment pipe and fitting system as manufactured by GF Piping Systems LLC (or approved equal).

PART 3 - EXECUTION

3.1 INSTALLATION

  1. A factory representative shall assist the contractor in system layout and “take-off” prior to an order being placed with the factory, for the purpose of ensuring all required components of the system are understood.
  2. For projects requiring conformance with ASME B31.3, the unique closure coupling design of the Double-See® system allows for visual inspection of all primary joint connections during pressure testing before sealing the secondary pipe joint. Any other manufactured product submitted as an “or equal” to this specification must also meet the B31.3 requirements.
  3. Pipe and fittings shall be installed according to current Double See® installation instructions as delivered in print or found online at www.gfpiping.com . An on site installation seminar shall be conducted by GF Piping Systems personnel who are certified to conduct said installation seminars. Seminar shall include all aspects of product installation (storage, set-up, support spacing, centralizer spacing, system expansion, temperature considerations, solvent cement joining procedure, product testing procedures, etc.). At the conclusion of the installation seminar all installers will be a certification test and, upon successful completion of said test will be issued a certification card verifying they have met the requirements of this specification.
  4. Solvent Cement and Primer used for installation of Double See® PVC system must be compatible with GF Piping LLC requirements as outlined within product installation documentation.

3.2 Testing

  1. The system shall be installed in such a manner that will allow for the testing of the primary pipe independent of the secondary pipe. Simultaneous testing of both components of the system will not be accepted (Per paragraph “B” above).
  2. The system shall be tested in accordance with all local plumbing/mechanical codes having jurisdiction in the territory where the installation is to take place. All sections of the primary piping system shall be hydraulically tested to a maximum of  150% of the designed working pressure. All secondary piping (interstitial space) shall be tested pneumatically to a maximum of 5 PSI air or hydrostatically to 50 PSI or less. Strict adherence to the published testing procedures for the Double-See® must be made by the installer when testing the system.

Double-See CPVC Specification

PART 2 - PRODUCTS – MATERIALS

2.1 SECONDARY CONTAINED PROCESS PIPE AND FITTINGS SYSTEM (Above and Below Slab)

  1. CPVC primary and secondary pipe and fittings for the double containment process piping systems installed below grade shall be Schedule 80 joined by the solvent cement joining method.  Pipe and fittings shall be manufactured of chlorinated polyvinyl chloride (CPVC). Material shall safely convey flow streams up to 200° F (93° C) at a pressure rating of 150 PSI.
  2. All piping (primary and secondary) for this system shall be marked with the following “+GF+ CPVC 4120 SCH. 80 (size) xxxx PSI WP @ 73F ASTM F441 NSF-pw-U.P. Code-G (control #) Made in USA”.
  3. All fittings (primary and secondary components) shall be legibly marked showing GF Piping Systems LLC trademark, fitting size, manufacturers part number and symbol indicating the material.
  4. PVC centralizers will be designed with enough space for pass through of leak detection cable in the event the system is specified for same (in this event it is suggested the installer provide a “pull” line in all pipe lengths and fittings for ease of cable installation within the interstitial space once the system is in place)..
  5. Any custom fittings which may need to be fabricated due to field conditions or requirements of horizontal and/or vertical dimensioning shall conform to the standards of this specification. Only custom fittings manufactured by GF Piping Systems LLC shall be acceptable for installation within the system. All valve and flange boxes required to suit project conditions shall be as catalogued and manufactured by GF Piping Systems LLC.
  6. System shall be Double-See®  PVC double containment pipe and fitting system as manufactured by GF Piping Systems LLC (or approved equal).

PART 3 - EXECUTION

3.1 INSTALLATION

  1. A factory representative shall assist the contractor in system layout and “take-off” prior to an order being placed with the factory, for the purpose of ensuring all required components of the system are understood.
  2. For projects requiring conformance with ASME B31.3, the unique closure coupling design of the Double-See® system allows for visual inspection of all primary joint connections during pressure testing before sealing the secondary pipe joint. Any other manufactured product submitted as an “or equal” to this specification must also meet the B31.3 requirements.
  3. Pipe and fittings shall be installed according to current Double See® installation instructions as delivered in print or found online at www.gfpiping.com . An on site installation seminar shall be conducted by GF Piping Systems personnel who are certified to conduct said installation seminars. Seminar shall include all aspects of product installation (storage, set-up, support spacing, centralizer spacing, system expansion, temperature considerations, solvent cement joining procedure, product testing procedures, etc.). At the conclusion of the installation seminar all installers will be a certification test and, upon successful completion of said test will be issued a certification card verifying they have met the requirements of this specification.
  4. Solvent Cement and Primer used for installation of Double See® system must be compatible with GF Piping LLC requirements as outlined within product installation documentation.

3.2 Testing

  1. The system shall be installed in such a manner that will allow for the testing of the primary pipe independent of the secondary pipe. Simultaneous testing of both components of the system will not be accepted (Per paragraph “B” above).
  2. The system shall be tested in accordance with all local plumbing/mechanical codes having jurisdiction in the territory where the installation is to take place. All sections of the primary piping system shall be hydraulically tested to a maximum of  150% of the designed working pressure. All secondary piping (interstitial space) shall be tested pneumatically to a maximum of 5 PSI air or hydrostatically to 50 PSI or less. Strict adherence to the published testing procedures for the Double-See® must be made by the installer when testing the system.

Part Numbers / Dimensions

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