INSTALL_1999 - Laserfiche WebLink

Home Browse Search

• • 71 2. The piping should be separated by a distance of at least four to six inches (100 mm -150 mm). See Fig. 1.6.3. For double-wall sec- ondary containment piping installations, re- fer to Part Two, Section 3, Fig. 2.3.1 for proper distances. Compact backfill care- fully over and around the piping system (see Fig. 1.6.1). When using tamping equipment, take care to prevent vi- bration from driving small stones into the pipe wall. SECTION 6 + Installation �r+•�-r+•�-r+•ter+ r%,_for- (.6 }ILI }Ll }Ll �Ll }L) Table 1.6.1 ILI�• 4" (min.).1 t 700 mm _ 1 Table 1.6.1 1 } "I 'l - , - - - -- `i - 6 (min.) 150 mm The pipe must be completely surrounded with select backfill (sand or 1/8" to 3/4" pea gravel). 6" FIGURE 1.6.3 The amount of Com- I 150 Mm paction and the type of soil determines the soil modulus. For example, pea gravel has a typical modulus of 1,000 psi with no com- paction, while sand requires slight compaction (85% Proctor density) to achieve a modulus of 1,000 psi. Refer to ASTM D3839 or AWWA C950 for further de- tails. Cover the pipe as soon as possible after successful test- ing to eliminate the chance of damage to the pipe, floating of the pipe due to flooding, or shifting of the line due to Backfill must ,q "►iti be tamped into shaded areas. FIGURE 1.6.1 cave-ins. If damage is sus- pected, the lines should be retested. Frozen earth will eventually thaw, leaving the pipe with insufficient support and voids around the pipe. Take care to remove frozen lumps from all backfill materials before backfilling (see Fig. 1.6.2). Remember, in all cases, the pipe must be complete - RED THREAD IIA Pipe & Fittings ly surrounded with select backfill (sand or X" to %" pea gravel). Native backfill materials should never be used. In all cases, there must never be voids (areas that do not con- tain backfill) under or around the pipe. Six inches (150 mm) of the fill must be placed under the pipe as bedding material (see Fig. 1.6.3). 1.6.3 Adhesive Bonding Several basic adhesive systems are available from Smith Fiberglass Products. They differ in operating characteris- tics and working time (pot life). See Fig. 1.6.4. Table 1.6.2 Iists the adhesive kits, their recommended us- age, and the approximate number of bonds per kit. The working life of each kit is based on an ambient tempera- ture of 75'F (24°C). 1. Cleaning the bonding surfaces a. Smith Fiberglass Products has determined that cleaning the bonding surface is required only when the bonding surfaces, on either pipe or fittings, have been contaminated with grease, oil, dirt, fin- gerprints, etc. Freshly tapered spigots or factory - fresh spigots and bells do not require solvent clean- ing unless visibly contaminated. DO NOT TOUCH THE BONDING SURFACES OR ALLOW THEM TO BECOME CONTAMINATED. Acceptable cleaning methods are as follows: • Sand all bonding surfaces until contaminated area is removed. However, the sanding operation must be light enough to prevent changing the taper angle. 9