Geotechnical Data and Pile Design - Offshore Structures: Design, Construction and Maintenance - page 227

TABLE 4.1 Accuracy Classes

Measured
Parameter

Minimum Allowable
Accuracy

Maximum Length between
Measurements (mm)

Class

1 Cone resistance 50 kPa or 3% 20

Sleeve friction 10 kPa or 10%

Pore pressure 5 kPa or 2%

Inclination 2 degrees

Penetration 0.1 m or 1%

2 Cone resistance 200 kPa or 3% 20

Sleeve friction 25 kPa or 15%

Pore pressure 25 kPa or 3%

Inclination 2 degrees

Penetration 0.2 m or 2%

3 Cone resistance 400 kPa or 5% 50

Sleeve friction 50 kPa or 15%

Pore pressure 50 kPa or 5%

Inclination 5 degrees

Penetration 0.2 m or 2%

During the sounding, zero readings should be taken with the probe tempera-
ture as close as possible to the ground temperature, and all sensors and other
electronic components in the data-acquisition system should be temperature
stabilized.

CPT Results
The reporting of results from CPTs should comply with IRTP (1999) .
For each cone test, the following information should be reported offshore
after each test and in the field report (either in tabular form or in the CPT
profiles):

location ●

test number

●

coordinates of test location

●

date of test

●

cone serial number ●

cone geometry and dimensions, with position and dimensions of filter stone ●