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Standpipe for Nearshore CPT Testing

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When doing a nearshore CPT test, a “standpipe” is to be used at all times. This pipe shall act as the major casing through which all other tubes will run, such as the CPT casing, the CPT sounding tubes and possible drill-string. The standpipe has to be lowered by means of a crane or alike and fixed into the seabed in such a manner that the flow has no influence on the standpipe. The best moment to place the standpipe is at neap tide when the influence of the tide is minimum. The standpipe is for obvious reasons be placed as vertical as possible.

In general the standpipe sinks some meters into the seabed as a result of its own weight. This has to be verified by comparing the length of the standpipe with the water depth and the elevation of the deck above water level. If the standpipe is not firmly in place, one risks that the standpipe will be moved by tidal influences or waves, making it impossible to continue the CPT test. A secure fixing of the standpipe to the deck of the working platform is paramount. The standpipe come for this reason complete with an hydraulic holding clamp, that prevents the standpipe of sliding further (e.g. by its own weight) into the seabed.

The standpipe (OD = 225, ID = 200 mm) has a total length of 25 meter and comes in elements of different lengths. This enables the CPT operator to compose a standpipe tailored for the water depth at the testing sport.

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Gouda Geo-Equipment B.V.
Satellietbaan 8
2181 MH Hillegom
The Netherlands

Tel.: +31(0).715.318.475
E-mail: info@gouda-geo.com

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