Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...

Tables 3-2 and 3-3 provide a combined summary of the field and laboratory measurements for both sites
at each of the Denver and the Columbus evaluations. A few variations in the proposed plan were
necessary due to project and site circumstances and these changes are noted in the tables.
The critical measurements for this research were identified to be the tensile stress, flexural stress, and
modulus of elasticity of the retrieved samples. These laboratory measurements were conducted on all of
the samples retrieved from the Denver and Columbus evaluations described in the following two sections.
The results of the laboratory testing were compared with the material specifications for the original
relining work or directly with as-installed test results where available. The tensile strength was measured
with a minimum of three samples for each pipe segment. The flexural stress and modulus of elasticity
were measured with a minimum of five samples for each pipe segment. The standard operating procedure
(SOP) outlined in each of the relevant ASTM standards listed in Table 3-3 was followed.
Table 3-2. Field Measurement Plans
Field
Test Standard/
Measurements No. of Measurements Sample Instrument Notes
Soil conditions Denver: 6 per site Grab samples See Table 3-3 Field visual inspection and
+ bedding Columbus: 6 per site
soil lab analysis
Liner + host 1 each Denver 8 in. N/A Shipped to TTC for further
pipe specimen
clay pipe (6 ft
length);
Columbus 8
in. clay pipe
(6 ft length)
testing
Liner only 3 total Denver 2 N/A Shipped to TTC for further
specimen
pieces each 2
ft × 2 ft;
Columbus 1
piece 2 ft ×
4.3 ft
testing
Visual liner Continuous N/A N/A Digital photos as applicable
inspection
and possible.
Liner thickness Denver: mobile
N/A ASTM E797-05 36 in. pipe: 3 meas. within
(Prior to equipment not available;
Ultrasonic panel ; 5 meas. in host pipe
Sample Columbus: 36 in. pipe 8
Thickness. (both spring lines, crown
Retrieval) measurement; 8 in. pipe 5
Measurement and 45° on each side)
× 2 = 10 measurements.
(Olympus 8 in. pipe: 5 meas. as above
Model 37DLP) on each cut face
Liner thickness Panel samples: 4
N/A Caliper / ruler Panels: 1 meas. on each
(After Sample 8 in. pipe samples: 8 × 2
edge
Retrieval) × 2 = 32
8 in. pipes: Meas. at 45° for
each cut face at each end of
sample
Annular gap Denver: 8 in. only 8 × 2 × N/A Feeler gauge 8 in. pipes: meas. at 45°
2 = 32 meas.
both cut faces, both ends.
Columbus:
36 in. pipe sample: 2 meas.
36 in. pipe: 4 × 2 = 8
on remaining liner at each
measurements
8 in. pipe: 8 × 2 = 16
measurements
edge of removed panel.
N/A = Not Available
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