Download e-book for iPad: Fiberglass Pipe Design - Manual of Water Supply Practices, by American Water Works Association

By American Water Works Association

Fiberglass pipe has had vast attractiveness in potable water provide, due to its corrosion resistance, first-class power to weight ratio, dimensional balance, and occasional upkeep. This guide offers water provide engineers and operators a convenient unmarried resource for the entire info they want approximately fiberglass pipe and fittings. It covers layout, specification, buy, set up and upkeep, transport, handing, garage, becoming a member of, and hydraulics.

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Extra resources for Fiberglass Pipe Design - Manual of Water Supply Practices, M45

Sample text

Experience has shown that deflection levels of any flexible conduit can be higher or lower than predicted by calculation if the design assumptions are not achieved. 3 Deflection lag factor, DL. The deflection lag factor converts the immediate deflection of the pipe to the deflection of the pipe after many years. The primary cause of increasing pipe deflection with time is the increase in overburden load as soil “arching” is gradually lost. The vast majority of this phenomenon occurs during the first few weeks or months of burial and may continue for some years, depending on the frequency of wetting and drying cycles, surface loads, and the amount of original compaction of the final backfill.

When tabular data are not available or when additional accuracy is necessary, head loss in fittings (or valves) can be determined using loss coefficients (Kfactors) for each type of fitting. Table 4-1 provides the typical K factors. F Moody, Friction Factors for Pipe Flow, ASME, 345 E. , New York, NY 1001 7. 3 approach the K factor for each fitting is multiplied by the velocity head of the fluid flow. Equation 4-17 illustrates the loss coefficient approach. H f f = K (V2/2g) H f f = K (V2/2g) (4-17) Where: Where: H f f = equivalent fittings head loss, ft H f f = equivalent fittings head loss, m K = K factor for each fitting type from K = K factor for each fitting type from Table 4-1 Table 4-1 Many hydraulic handbooks provide K factors for various types of fittings and valves not included in this manual.

83 m (5-14) + LLDF (h)1/2 Where: Where: hint = depth at which load from wheels hint = depth at which load from wheels interacts interacts hint = (72 in. 83 m - t,)/LLDF Copyright (C) 2005 American Water Works Association All Rights Reserved (5-15) 56 FIBERGLASS PIPE DESIGN Calculation notes: 1. Equations as shown are for h in inches (meters). 2. AASHTO also specifies a surface lane load of 640 lb/ft (9,350 N/m) over a 10-ft (3-m) lane width. This lane load is ignored in these calculations because it has only a small effect on the total live load and may be added by the engineer if deemed appropriate.

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