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Secondary Containment Installation Instructions SEMON 2 (see Fig. 1). Thermoplastic snap-on centralizers are System Layout used for smaller sizes—up to 6"primary. Bond-on centralizers are used on larger sizes. Use%b"thick A. Primary Piping-Assemble primary piping accord- double-sided foam tape inside the thermoplastic ing to the installation instructions in Manual No. centralizers to hold them in place. Sand the prima- F6000 (F6010 for CHEM THREAD product). ry pipe O.D. before attaching bond-on centralizers. B. Containment Piping-In some cases, the proce- Note: Thermoplastic centralizers will be much stiffer dures for tapered joints from Manual No. F6000 in cold weather. Treat similar to adhesive;prewarm are required for assembling secondary contain- in cold weather before attempting installation. went joints. Shown in Figs. 2, 3, and 4 are cou- pling joints that may be either standard tapered Careful planning of the pipe layout will allow in- couplings or two-piece containment couplings. spection of the primaryjoints by moving the sec- Pipe ends joined to containment fittings must be ondary containment pipe along the primary pipe scarfed, while pipe ends joined to tapered cou- (see Figs. 5 and 6). During the layout planning, it plings must be tapered spigots. may be necessary to include a two-piece sec- ondary containment coupling in the layout to al- Containment pipe is placed over the primary pipe low additional clearance for inspecting the prima- during assembly of the primaryjoints. As the pri- ry joints. It is a good practice to obtain a few mary pipe is assembled,centralizers are bonded to extra two-piece couplings for the containment or snapped on the primary pipe depending on size. system in case it is necessary to provide clearance Smith Fiberglass supplies two types of centralizers for inspecting the inner pipe. Arn Product Piping FY . w.< Fi�2 R Figure 73 Figure 4 4