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• • Scarf O.D. of pipe so that the fitting halves fit together when assembled by hand. l If there is a gap between the fitting halves when assembled by hand, pipe must be scarfed more. FIGURE 2.2.2 Note: Sanded pipe ends must always fit snugly into the socket of the fitting. See Fig. 2.2.2. 2.2.3 Pipe Assembly The containment pipe must be positioned over the prod- uct pipe before bonding the product pipe. Pre -installa- tion of the secondary containment pipe (only) is best ac- complished at the same time the product pipe is dry -fitted together. This will speed up installation and prevent un- necessary delays. Where possible, temporarily place containment fit- ting halves around the product fit- tings. This mea- sure will help pre- vent foreign material from en- tering the contain- ment pipe (see Fig. 2.2.3). e o 0 0 0 Lay out system with all dry joints FIGURE 2.2.3 The containment fittings should be installed and the con- tainment system tested after the product piping system has been tested. Note: Do not leave rocks, pea gravel, sand, or other debris in the containment piping sys- tem. Typically, the length of the containment pipe is deter- mined from the following formula: L = OAL of product pipe - X1 - X2 Where: X1 = fitting #1 X2 = fitting #2 Using Table 2.2.1 and Fig. 2.2.4 as a guide, proceed as fol- lows: SECTION 2 ♦ System Preparation 1. Determine the length of the primary pipe. 2. Determine the fittings to be used on each end of the primary pipe. Find the corresponding numbers in Table 2.2.1 (X1 for first fitting, and X2 for the second fitting); subtract them from the OAL. This will be the length of the containment pipe. Example: If 2" (50 mm) product pipe is 20 ft., 6 in. (6248 mm) long, and you are using a 90° elbow on one end and a 45° elbow on the other end, then cut the containment pipe 20 ft,, 2 in. (6147 mm) long. Calculation: 20'6" - 2V (fitting #1, 90° elbow) - IV (fitting #2, 45° elbow) = 20'2" or 6248 mm - 54 mm (fitting #1, 90° elbow) - 48 mm (fitting #2, 45° elbow) = 6147 mm WARNING: Since every insertion of the primary piping may vary, dry fit all secondary containment connections to make sure that the insertion is approximately 3". Be sure that the containment pipe is not inserted too far into the containment fitting. The glossy O.D. of the pipe should not be seated in the containment fitting. Containment Product Pipe Pipe 1 X 7 ' 7 L OAL -i 1. X FIGURE 2.2.4 TABLE 2.2.1 Determining Length of Containment Pipe RED THREAD IIA Pipe & Fittings 23 X X X Product Coupling, 45° Termination Pipe Size 90° Elbow, Tee Elbow Fitting (in.) (mm) (in.) (mm) (in.) (mm) (in.) (mm) 2 50 2;s 54 1 % 48 4% 121 3 75 1% 48 2% 57 41/4 121 4 100 1% 48 2% 54 6 152 RED THREAD IIA Pipe & Fittings 23