DOUBLE CONTAINMENT SYSTEM DESIGN
Spears® Double Containment (DC) Fittings are constructed from standard fittings that are to be assembled on the jobsite. Spears® DC fittings work with standard pipe for both Carrier and Containment lines. Carrier fittings are equipped with special extender couplings for connection to carrier pipe. Simple, slip-on centralizer brackets used on the carrier pipe support this assembly inside the containment pipe. This design allows the carrier fitting to "float" within the containment fitting, allowing ease of movement for installation while reducing problems associated with thermal expansion and contraction during operation. This simplified approach to double containment makes installation very easy. However, successful installation requires proper design and planning of system layout, a basic understanding of how Spears® double containment fitting design works, and specific attention to a proper sequence of general assembly. See Double Containment Design & Installation Guide for additional details on design, installation and different configuration applications. DC fitting sizes are listed through 12", but additional sizes are available on request.
CONFIGURATIONS
DC Pipe: Spears® DC Fittings can be used with any standard pipe of the corresponding size and schedule. As a result, pipe is not listed in this product Schedule.
DC Fittings: Each configuration includes all components to form an internal Carrier Fitting with applicable Extender-Couplings and an external Containment fitting. Each DC Fitting configuration is specified as Carrier Material & Schedule x Containment Material & Schedule. Refer to example below (additional information is found in specific fitting sections).
Note: Assembled carrier/containment pipe available on request. Contact Spears® for additional information.
Example
A Double Containment 90" Ell having a 1/2" Schedule 40 Carrier and 2" Schedule 40 Containment pipe would be listed as follows:
Product Name |
 |
Configuration Description |
 |
 |
Carrier Elbow
Containment Elbow
Extender Couplings
|
Part Number |
Size |
Prod Code |
DC06-A005-A020 |
1/2X2 |
470 |
Centralizer Brackets should be ordered separately for Carrier pipe support in runs of Containment pipe.
Valve Boxes: Like DC Fittings, Valve Boxes include all necessary components for connection to the designated Carrier x Containment system. Valve Boxes include the applicable True Union Industrial Ball Valve, Ball Check Valve, or Diaphragm Valve, with designated elastomer seals. Refer to example below (additional information is found in specific Valve Box sections).
Example
A Valve Box with True Union 2000 Industrial Ball Valve having a 1/2" valve with Schedule 40 Carrier and 2" Schedule 40 Containment pipe would be listed as follows:
Product Name |
 |
Configuration Description |
 |
 |
Carrier Valve
Containment Valve Box
Extender Couplings
|
Size |
EPDM |
FKM |
Prod Code |
1/2X2 |
VBA20-A005-A020 |
VBA30-A005-A020 |
470 |