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ASTM design condition for CIPP

Fully deteriorated condition is designed to support hydraulic, soil, and live loads. The groundwater level, soil type and depth, and live load should be determined by the engineer.

Partially deteriorated condition is designed to support the hydraulic loads due to groundwater, since the soil and surcharge loads can be supported by the original pipe. The soil adjacent to the existing pipe must provide adequate side support. The pipe may have longitudinal cracks and up to 10% distortion of the diameter.

Fully Deteriorated Partially Deteriorated

Host Pipe Loading

Live loading conditions

Use this option to apply standard AASHTO Highway, Cooper railroad, or applied live loads. The values of the live load pressures are determined with respect to depth and include an impact factor to account for bumps and irregularities in the traveled surface.

See American Lifelines Alliance for additional details.

Applied Live Load

Applied Live Load (psi)

If the live load is known, enter the calculated live load as pressure applied directly to the host pipe in psi. External live loads are ignored in the partially deteriorated design condition.

Host Pipe Diameter

Average inside diameter of host pipe

Enter the inside diameter, in inches, of the host pipe to receive the CIPP.

Depth to Invert

Depth from surface to host pipe invert (ft)

Enter the depth from ground surface to invert of host pipe in feet. If depth varies, perform calculation on both extremes and select the most conservative CIPP design.

Groundwater Depth

Depth from surface to nearest evident groundwater (ft)

Enter the smallest depth from ground surface to highest evident water table in feet. Leave blank for unknown conditions (assumes groundwater at surface). To exclude groundwater pressures, enter a depth for the water table that is deeper than the host pipe.

Soil Density

Soil density (pcf)

Soil density in lbs/ft³

Soil Modulus

Modulus of soil reaction (psi)

Enter the modulus of soil reaction in psi. Typical values range from 700 to 1500 psi. Use 700 psi for unknown conditions (conservative). Use 1000 under traveled surfaces consolidated over time. Use 1500 for deep pipe in stable soils.
If soil data has been obtained from a site investigation, use table 5.8 of AWWA Manual of Water Practices M45, Second Edition.

Elastic Modulus

Design modulus of elasticity (psi)

Enter the modulus of elasticity in psi from the CIPP manufacturer. ASTM F1216-09 requires a minimum value of 250,000 psi as tested by ASTM D790. NASSCO recommends using 400,000 psi for enhanced composites.

Flexural Strength

Design flexural strength (psi)

Enter the design flexural strength in psi as provided by the CIPP manufacturer. ASTM F1216-09 has set a minimum value for field inspection of 4,500 psi as tested by ASTM D790. NASSCO recommends using 4,500 psi for standard and enhanced composites.

Safety Factor

Factor of Safety

Typically 2.0

Retention Factor

Long-term retention factor of design properties (%)

Enter the long-term retention factor as a percent of the design value. This value is determined by long-term tests or as approved by the owner/manufacturer. The typical range for long-term retention is 50%—75%.

Ovality

Host pipe ovality (%)

Enter the percent ovality of the host pipe as determined by the following equation.

Enhancement Factor

Enhancement factor (dimensionless)

The enhancement factor (K) is used for design in partially deteriorated conditions. ASTM recommends a minimum value of 7.0 where there is full support of the existing pipe. NASSCO designates that 7.0 shall be used for partially deteriorated design.

Poisson's Ratio

Poisson's ratio (dimensionless)

Poisson's Ratio should be taken as 0.3 unless otherwise determined by the engineer.

Host Manning's

Host pipe Manning's n-value

Enter the Manning's n-value of the host pipe to determine changes in flow capacity.

Liner Manning's

CIPP Manning's n-value

Enter the Manning's n-value of the CIPP pipe to determine changes in flow capacity.

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