Joint PerformanceAn infiltration rate of less than 25 U.S. gal./inch dia./mile/day can be assured using the CORR-21™ patented joint design. Diamond Plastics, CORR-21™ gasket provides a symmetricaldual three-point seal. Catch-basin cave-ins and sink holes are virtually eliminated because the CORR-21™ joint will not permit infiltration of fine bedding materials. The joint integrityis assured because it meets ASTM D3212. The manhole adapters supplied with CORR-21™ are equally tight.

Field Cutting and JoiningBecause the ribs are perpendicular to the axis of the pipe, the pipe can be cut between any corrugation. The rubber gasket can then easily be placed between the corrugationsand the pipe joined together to form a water-tight seal. Gasket material shall meet the requirements of ASTM F477Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe.

DimensionsP V C P I P E F O R T H E 2 1 s t C E N T U R Y

p a g e _ T W O

Before assembly, clean and lubricate bell I.D. to third corrugation,along with the gasket.

CORR-21 is supplied in 14 foot laying lengths.CORR-21TM PIPE DIMENSIONS

Nominal Pipe Size

Barrel Outside Diameter Inches

Bell Outside Diameter Inches

Minimum InsideDiameterInches

SpigotInsert Mark Inches

Minimum Wall Thickness (†)Inner WallT2 ( in Inches )

Outer WallT1 ( in Inches )

12 12.90 16-1/2" 11.687 7-1/4" 0.058 0.049 0.07215 15.71 18-1/2" 14.303 7-1/4" 0.077 0.055 0.09218 19.30 22-1/2" 17.510 7-1/4" 0.084 0.067 0.10321 22.78 26-1/2" 20.656 9" 0.095 0.073 0.11024 25.76 29-1/2" 23.412 10" 0.110 0.085 0.12327 29.16 33-1/2" 26.371 9" 0.120 0.091 0.13730 32.47 37 29.388 9-1/2" 0.130 0.105 0.14736 39.10 44-1/2" 35.370 11" 0.150 0.125 0.171

at ValleyT3 ( in Inches )

Properly assembled joint.

T2

T3

T1

Long Term Deflection of PVCThe chart below was developed to show acceptable burial conditions for CORR-21™ pipe. The areas shaded orange will resultin long term deflections of less than 7.5%. A 7.5% deflection limit provides a safety factor of 4.0 on the well established conservativePVC deflection performance limit of 30%.

Excluding the effects of live load and longitudinal bend-inding, the chart below gives the design engineer a ready reference without the need to calculate deflections.For example, an application that calls for depths of cover of14 feet or less, with native Class IV materials can be designedby checking the chart. For 14 feet of cover we note that thesquare across from Class IV material compacted to 65% is gray and therefore not recommended. However, for Class IVmaterial compacted to 75% or better, the square is orange under the 14 foot cover column. Therefore, the native soil may be used for haunching as long as it is compacted to 75% or greater.

The chart does not take into account live loads. When live loads are not a factor, the chart can be used directly to determine whether long-term deflection of the CORR-21™ is below 7.5%. When live loads must be considered, first determine the combined total external load on the pipe. Next, determine the equivalent prism load (without live load) for the particular pipe size involved. Determine the height of the cover (ft.) for the equivalent prism load. Using this height of cover with the bedding class and proctor density, use themaximum long-term deflection chart to determine the burialconditions which are acceptable. In working with these charts,it becomes apparent that:

1. Soil density in the pipe zone plays a greater role than soil type in the control of deflection in buried flexible conduits.

2. The amount of deflection is independent of pipe size.

Long Term Deflection of PVCP V C P I P E F O R T H E 2 1 s t C E N T U R Y

p a g e _ S E V E N

CORR-21TM Maximum Long-Term Deflection Chart

Minimum F/�y = 50 psi Note: Pipe size does not appear in the chart for maximum long-term deflections.

Note: Deflection values shown do not includeeffect of live load or longitudinal bending.1. No length of pipe installed under conditions specified will deflect more than is indicated; the pipe will deflect less than the amount indicated if specified density is obtained.2. External loading based upon soil weight at 120 lbs. per cubic foot.

3. Deflections predicted are based upon pipe which was initially circular prior to installation. Actual deflections may differ because of initial out of roundness caused by storage and/or handling. These variations should be taken into account when measured deflections are compared with those in the table.

4. Bedding classifications are as indicated in ASTM D2321.5. Deflections listed in table are maximum long- term values. The suggested maximum long-term value is 7.5 percent which is approximately equal to a 5 percent initial deflection.6. Initial deflection is deflection taken within the 1st 24 hours after trench is backfilled.

Gravel Class I 95%

Class II 90%

80%

Sand Class III 90%

85%

75%

65%

Clay Class IV 85%

75%

65%

Density(Proctor)AASHTOT-99

ASTMBeddingClassification (ft.) 1 3 5 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60

(m.) .25 .91 1.52 2.44 3.05 3.66 4.27 4.88 5.49 6.10 6.71 7.32 7.93 8.54 9.15 9.76 10.37 10.98 11.59 12.20 12.85 13.41 14.02 14.63 15.24 15.85 16.46 17.07 17.68 18.29

Peat Class V This soil class not recomended.

For minimum depths of cover as shallow as 1 foot, additional information should be obtained from your sales representative.

Height of cover (feet ) (meters) Deflections less than 7.5% Deflections equal to or greater than 7.5%