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0 0 <br /> Secondary Containment Installation Instructions <br /> Table 6 Differential Expansion and c. Using a sander, coarse file, or sandpaper, re- <br /> Contraction Allowance move the gloss from both ends of the contain- <br /> Containment Max. Allowable ment pipe (nipples). The sanded area on either <br /> Size Expansion/Contraction end must be equal to the minimum scarf <br /> (In.) (In.) length, and the scarf diameter must be within <br /> 3 0.05 0.010" of the specified value. Note: A pi tape <br /> 4 0.05 (or other O.D. measuring device) will be re- <br /> 6 0.08 quired to check the scarf diameter. <br /> 8 0.10 Proceed slowly with the sanding operation to <br /> 10 0.15 maintain a uniform scarf O.D. <br /> 12 0.20 <br /> 14 0.25 d. Position the nipples between the new contain- <br /> 16 0.30 ment fitting and a containment sleeve cou- <br /> pling as shown in Fig. 13. It may be necessary <br /> to remove additional sections of the contain- <br /> SECT/OM S ment pipe to provide clearance for the cou- <br /> Repairs pling. Repeat the procedure for sanding nip- <br /> ples on the cut end of the containment piping. <br /> Note: DO NOT attempt to repair damaged fittings. <br /> If the failure is through the wall of the fitting, the fit- e. Bond the fitting and sleeve couplings into <br /> ting must be replaced. Repair procedures for failed place as shown in Fig. 13. <br /> bonds or pipe wall sections are as follows. <br /> A. Repairing Minor Pipe Damage-Follow the proce- <br /> dures in Manual No. F6000 for repairing pipe wall <br /> damage. ° <br /> e <br /> B. Repairing Extensive Pipe Damage-Containment o 0 <br /> sleeve couplings have a space in the center be- <br /> tween the socket joints. Therefore, adding a <br /> sleeve coupling to the system will increase the to- <br /> tal length and/or make up for removed sections of Cut <br /> pipe. In some cases, more than one sleeve cou- <br /> pling may be required to replace a damaged pipe <br /> section. To prepare the scarf nipples for installing <br /> sleeve couplings, refer to the following section for Figure 12 <br /> replacement of fittings. <br /> C. Replacing Failed Containment Joints-When <br /> cutting out and replacing a containment fitting, <br /> be careful not to cut the internal primary product Containment Elbow <br /> pipe (see Fig. 12). Containment <br /> Sleeve Coupling <br /> a. Dissect the containment fitting and the con- ° ° ° ° ° ° <br /> tainment pipe around the circumference as -e o-° o------ <br /> shown in Fig. 12. Remove the containment el- ° <br /> ° <br /> bow. ° ' <br /> I <br /> b. Create a pipe nipple at least twice the mini- ; ;° <br /> mum scarf length on either side of the primary ; ; <br /> ° Niles <br /> fitting by making another cut around the con- ; ; pp <br /> tainment pipe. <br /> Figure 13 <br /> 11 <br />