DESIGN

For SURE-LINE rehabilitation, the two most common design cases are partially deteriorated and fully deteriorated pipe. Partially deteriorated pipe provides significant strength the to SURE-LINE HDPE liner because the existing pipe is still somewhat functional. In the fully deteriorated case, the original pipe is not structurally sound and cannot support the design parameters required. The fully deteriorated case is supported by: 1) missing sections of the original pipe, 2) the pipe no longer retaining its roundness, and/or, 3) the pipe being severely corroded.

SAMPLE CALCULATION OF REHABILITATION PRESSURIZED PIPE

Calculations for 8-inch SURE-LINE installed inside a pressurized pipe as specified by Client:

 

Tension:	Properties of SURE-LINE
Tensile strength	3,300 psi
Modulus of elasticity E	113,000 psi
Long term modulus of elasticity	84,750 psi

Flexure:
Flexure strength f	3,000 psi
Flexure modulus of elasticity E	136,000 psi
Long term modulus of elasticity	102,000 psi
Expansion coefficient of c(e)	0.000090 in/in/C

Other Properties :
Approximate operating temperature limit	160 ° F
Linear thermal coefficient of expansion	1.4 X 10- in/in/C
Hydrostatic design basis	1.600 psi
Water absorption in 24 hours	0.1%

Gas permeability:
	methane
	hydrogen

Permeability constant (K) as per AGA:

Methane	85
Carbon monoxide	80
Hydrogen	425