Analysis of Temporary Wooden Cribbing Blocks for Pipe Support

Proceedings Publication Date:

23 Jun 2017
Presenter
Dr. Diego D'Alberto
Company
Author
Dr. Diego D'Alberto, Dr. Agostino Napolitano, Dr. Salvatore Morgante, Dr. Angelo Rosato
Part of the proceedings of
Abstract
Pipeline industry doesn’t offer an uniform standard for temporary supports during onshore stringing and welding. Wooden cribbing blocks are still widely used during construction although new products have been introduced for their replacement providing cost effective solutions. Since poorly supported pipe strings may cause serious injuries or fatalities, it is mandatory to perform an engineering assessment to select the best temporary support. Destabilizing forces on the skid supports are mainly due to the transversal deformation of the pipe string generated by the environmental thermal conditions. The present technical paper provides results of a case study performed for a 48” pipeline temporary supported by wooden cribbing blocks, showing how thermal gradient between the two sides of the pipe can cause longitudinal and transversal movements on skid support that can lead to critical stability conditions. A sensitivity analysis has been performed to investigate the influence of pipe string configuration, presence of bends, construction sequence and daily sun irradiation. 3D FEM analyses have been performed on pipe & wooden skid assembly to understand failure mechanisms and to identify the most stable skid type in relation to their structural features and geometry. The material presented is considered to be of interest to pipeline and safety engineers to comprehend the wooden skid limitations, margins for improvement and safety confidence against the loads to be carried.

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