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Secondary Containment Installation Instructions D. Repairing Leaking Containment Fittings-Bond low points. Leaks to these wells can be detected leaks may be repaired by overwrapping the fitting visually with removable covers on the wells or with glass cloth and adhesives provided in the DS- electronically with detectors in the well. Several 8088 epoxy or DS-6088 vinyl ester adhesive main- types of detectors are available. The type chosen tenance kit from Smith Fiberglass Products. The will dictate the size and type of piping required overwrap procedures are similar to those for over- for installing the detectors. For large systems and wrapping a leaking joint as shown in Manual No. for ease of locating leaks,several detection points F6000. Exceptions to Manual No. F6000 are as may be used. follows: The most sophisticated system is the continuous • Overwrap for containment fittings must cover monitoring cable systems that can detect leaks 4"beyond both edges of the fitting, i.e. over- within about 12" of the failure. Systems using wrap starts 4" on one side of the fitting and monitoring cables require clearance for the cable continues to 4"on the other side. along the bottom of the annulus. A common di- mension is a minimum of/"clearance for cable • Overwrap must never be made over uneven connections. Pipe is typically assembled with pull surfaces such as the step at bell ends and tabs ropes to pull the cable in after the piping is tested. (flanges) on the sides of containment fittings. Electrical fish tapes can be used as an alternate to All tabs (flanges) must be cut off,and the sides pull the cable. This requires pull points be de- must be sanded to form a rounded surface. signed into the system. Wrapping over projections will create sharp breaks in the glass pattern. This practice will cre- B. Burial-Since two-piece fittings are designed to ate voids(weak areas) in the overwrap. For a reli- meet minimum stiffness required by AWWA C950 able overwrap,small pen grinders with rounded (American Water Works Association), burial in- cutting heads are recommended for bevels at the structions for secondary systems are the same as end of bells and for rounding of tabs. for primary systems. Refer to Manual No. F6000 for glass application C. Static Electricity-Refer to Manual No. E5000, procedures, keeping in mind that the glass cloth Section 7, Para. E, with consideration that the pri- must be overlapped from side to side when cover- mary pipe will not be in contact with the ground. ing the entire fitting and pipe. When handling nonconductive fluids at high ve- locities, it may be necessary to ground the prima- SECT/ON 9 ry pipe by wrapping the O.D. (outside diameter) Other Considerations with a conductive material (wire) and installing grounded metal components (such as commercial A. Leak Detection-Several methods of leak detection static eliminators) that make contact with the flu- can be used with the containment system. The id (liquid) stream. Using threaded saddles to ob- type of detection system may dictate the size of the tain access to the grounding devices in the prima- containment pipe and also the types and quantities ry system is practical for this type of application. of fittings for detection wells or pull points. The decision for type of detection should be made early D. Water Hammer-Systems with fluid (water) ham- in the design phase,and the manufacturers of leak mer surges significant enough to produce move- detection systems should be contacted for the de- ment in the primary pipe must be anchored to sign parameters required for their systems. prevent impact against the containment fittings. Refer to Manual No. E5000 for additional infor- The simplest system slopes back to a low point mation concerning fluid hammer (Section 7, where fluid from a leak will collect. Leaks can Para.J). then be detected with a sight glass or drain valve for above ground systems. For below ground sys- tems,wells or sumps should be constructed at the it is the policy of Smith Fiberglass Products to improve its products continually. In accordance with that policy,the fight is reserved to make changes In specifications,descriptions,and illustrative material contained in this bulletin as condi- ISO 1 tionswarrant The information contained herein is general In nature and is not intended to express any warranty of any type whatsoever,nor shall any be implied: ®Registered Trademarks of Smith Fiberglass Products Inc. 12 ®Copyright 1994 Smith Fiberglass Products Inc. PRINTED IN U.S.A.,497