COMPLIANCE INFO_1999-2005 - Laserfiche WebLink

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SECTION 6 ♦ Installation 1. Typically, all piping should slope at least X" (3 mm)per foot toward the tank. Support pipe properly to prevent traps or sumps. 'cJ ' c J . c 2. The piping should be separated by a , distance of at least four to six inches �� -' �� 4" (min.) T '' (100 mm-150 mm). See Fig. 1.6.3. For �1 �� 100 mm , _ 1L1 Table 1.6.1 double-wall secondary containment piping installations,refer to Part Two, Section 3, Fig.2.3.1 for proper dis- tances. t I _ 3. Compact backfill carefully over and i•7 AJ 1 - - _ ,-y_ 6"(min.) around the piping system (see Fig. 150 mm 1.6.1). When using tamping equip- �•7 r} 1 j}l`, }�1 i}�1®} ®� 1 } 1 ment, take care to prevent vibration from driving small stones into the pipe The pipe must completely wall. surrounded withh select backfill 6 (sand or 1/8"to 3/4" pea gravel). 150 mm FIGURE 1.6.3 The amount of compaction and the type of soil determines the soil modu- lus. For example, pea gravel has a typical modulus of backfill materials should never be used. In all cases,there 1,000 psi with no compaction,while sand requires must never be voids(areas that do not contain backfill)un- slight compaction (85%Proctor density)to achieve a der or around the pipe. Six inches(150 mm)of the fill must modulus of 1,000 psi. Refer to ASTM D3839 or AWWA be placed under the pipe as bedding material(see Fig. 1.6.3). C950 for further details. 1.6.3 Adhesive Bonding 4. Cover the pipe as soon as possible after successful test- ing to eliminate the chance of damage to the pipe,float- Several basic adhesive systems are available from Smith ing of the pipe due to flooding,or shifting of the line Fiberglass Products. They differ in operating characteris- due to cave-ins. If damage is suspected,the lines should tics and working time (pot life). See Fig. 1.6.4. be retested. Table 1.6.2 lists the adhesive kits, their recommended us- 5. Frozen earth age, and the approximate number of bonds per kit. The will eventually working life of each kit is based on an ambient tempera- thaw, leaving ture of 75°F(24°C). the pipe with insufficient 1. Cleaning the bonding surfaces support and voids around a. Smith Fiberglass Products has determined that the pipe. Take cleaning the bonding surface is required only when Ocare to remove the bonding surfaces, on either pipe or fittings, Backfill must ., y"' frozen lumps have been contaminated with grease, oil, dirt, fin- be tamped into shaded areas. from all backfill gerprints, etc. Freshly tapered spigots or factory- FIGURE 1.6.1 materials before fresh spigots and bells do not require solvent clean- backfilling(see ing unless visibly contaminated. DO NOT TOUCH Fig. 1.6.2). THE BONDING SURFACES OR ALLOW THEM TO BECOME CONTAMINATED. ,` Remember,in all cases,the pipe must Acceptable cleaning methods are as follows: be completely sur- rounded with select Sand all bonding surfaces until contaminated area is backfill(sand or X" removed. However, the sanding operation must be 0916 9Q to X"pea gravel). light enough to prevent changing the taper angle. Spacers used during YES NO installation must Cut off contaminated surface and replace with a new FIGURE 1.6.2 be removed before taper or sleeve coupling. backfilling. Native RED THREAD IIA Pipe & Fittings — 9