In hot strip rolling, the curvature of the camber varies longitudinally along the strip

This work presents the results of monitoring of a jacket docking over atemplate, which is provided with a pile guide system in 101 meters water depth. The measurements comprised the crane-ship motions, the jacket motions and theguide loads during the docking. The most important measurements were relatedwith the guide loads that reached values around 40mt. for the systemmonitored. Introduction Due to need for early oil product.ion in Brazil the jackets are usuallyinstalled over pre-drilled wells. These wells end up on a template at thebottom of the sea and they are provided with a system of pile-guides to helpjacket docking. From a series of seven jackets scheduled to be installed in NorthEast Poleof Campos Basin (Fig. 1) over templates, Pargo-1A was the first installed. The final positioning was achieved by coupling three guide-sleeves attachedto the jacket on three pile-guides fixed around the template. A crane-ship wasused for the jacket docking. The main dimensions of crane-ship and jacket are shown in table 1. A sketchof pile-guides position is shown in fig. 2. The water depth is 101m. The mainconcern of the measurements were the loads acting on the docking guides. Thedocking guide system have some particularities that should be highlighted. Theyshould be flexible enough to bend and absorb impact and oscillatory loads dueto jacket motion; but they should be rigid enough to work as a guide andguarantee the correct placement of the jacket over the wells.

The present report deals with the results of the vibration measurements of 32,000 ton d. w. super tanker in trial trips. All the natural frequencies of the flexural and torsional vibrations up to the blade frequency were observed involving those of small amplitude measured by the Geiger vibrographs and the optical one which has been made on trial. Since the measured critical frequencies of the flexural vibration of the hull are almost proportional to the number of node in both cases of ballast and loaded conditions, it is pointed out that the higher modes of the hull vibration are considered to be of the shearing vibration. The theoretical investigations on the present observations in details are not presented except one of the computed result of the vibration profile of the higher mode of the shearing vibration of the hull as an example.

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