EXTERNAL LOAD CALCULATIONS FOR DIRECT BURIED CONDUIT 25701 Science Park Drive Cleveland, Ohio 44122 216-464-3400 1-800-3CARLON (322-7566) EXTERNAL LOADS ON DIRECT BURIED PVC OR HDPE CONDUIT OR DUCT FALL
sand at 80% compaction, the A36 HDPE pipe with the lowest moment of inertia requires a minimum of 24 in. (610 mm) soil cover. The C48 HDPE pipe with the largest moment of inertia and all other pipes require a 12 in. (305 mm) minimum soil cover.
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For example, if a cover/rim fails at 3,000 kg (6,600 lb), then its maximum safe live load is 1,500 kg (3,300 lb) and it will be rated medium duty since the next smaller safe live load listed in Table 1 is 900 kg (2,000 lb) for the medium duty classifiion.
The objective of this paper is to evaluate the response of High Density Polyethylene (HDPE) pipes under various backfill conditions and 24-in. (610mm) cover. Eight full-scale field tests were conducted on 36-in. diameter HDPE pipes from two
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HDPE grades are specially designed to meet demanding appliions like high-pressure pipes, telecom ducts, carrier bags, woven sacks, and injection and blow-moulded products. LLDPE grades are used extensively in speciality films, milk and edible oil packaging, lamination films, cast films, stretch films and other appliions like rotational moulding and injection-moulded products.
The tests were designed to simulated surface live loads passing over the pipe with a concentrated load applied through a 12-in. (305 mm) square plate that provides very severe loading conditions.
Live Load (PL) = 2 3 2 3 r IfWW H = 2 3 2 (5.6) 3*3*16,000 *(2.5 ) ft lb ft = 65.0 psf The live load is 130 psf to account for two wheels. Where: H = Total Depth of Cover = 2.5 feet If = Impact Fator =3 (For an unpaved surface) Ww = Wheel Load = 16,000 Ibs
In this case, your joists are adequate to support a 30 psf live load and 10 psf dead load. Use span tables for progressively heavier loads until you find the limits of your floor. In this example, the table for a 40 psf live load/10 psf dead load floor shows that the joist in the example have a required Fb value of 1,644 and an E value of at least 2,400,000.
tical pressure adjacent to the liner due to earth load, water load, and surface live loads. The riser should be designed for this external pressure, just as if it were a horizontal pipe. Where the water table is below the riser, the vertical pres-sure, p v (psf), at anyH p v
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4/8/2008· RE: Buried pipe load bearing capacity calculations civilperson (Structural) 1 Aug 08 18:06 In all buried pipe types, the backfill type and quality is crucial in the capacity due to the soil/pipe interaction.
This theoretical live load (HL93), defined as the “Design Truck”, is an HS-20 load or 16,000 lbs. applied to a 10” x 20” surface load pad. This is one of the factors included in the standard, in addition to dead load (soil weight), surcharge loads, and all applicable load/safety factors.
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CHAPTER 5: DESIGN METHODOLOGY Both flexible and rigid pipe require proper backfill, although the pipe/backfill interaction differs. When flexible pipe deflects against the backfill, the load is transferred to and carried by the backfill. When loads are applied to
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Roof Live Load: Per code roofs need to be designed for minimum load of 20 psf. Pipe Carrying Capacities It is frequently desired to know what quantity of pipes of a given size are equal in carrying capacity to one pipe of a larger size.