Installation tool for helical strakes in marine riser vortex-induced vibration restraining test

Abstract

The invention discloses an installation tool for helical strakes in a marine riser vortex-induced vibration restraining test. The installation tool comprises helical line marking and locating rings and helical line adhesion locating rings, wherein the helical line marking and locating rings and the helical line adhesion locating rings are each formed by hooping and connecting two half rings. Multiple radial locating lines are distributed circumferentially from the inner edges of the helical line marking and locating rings at equal intervals. The number of the radial locating lines is the same as the number of the helical line marking and locating rings fixed to each thread pitch on a bare pipe in the helical line marking process. Multiple helical strake locating grooves are formed circumferentially in the inner surfaces of the helical line adhesion locating rings at equal intervals. The number of the helical strake locating grooves is the same as that of the helical strakes. The end face of each adhesion locating ring is provided with an adhesion locating ring locating line. By the adoption of the installation tool, the position marking work of the helical lines is simplified, it is conveniently guaranteed that the thread pitch of the helical strakes is accurate, a continuous helical line is located among marking points, and the helical strakes are convenient to install.

Description

technical field [0001] The invention relates to an auxiliary installation tool, in particular to a device for installing a marine riser vortex-induced vibration suppression spiral strake in a laboratory. Background technique [0002] With the rapid development of the economy, the improvement of productivity, and the increasing energy consumption, my country has changed from an oil exporter to an importer. Petroleum has become a bottleneck restricting my country's economic development. Offshore oil and gas development, especially deep-sea oil and gas development is an important field of energy development in the world, and it is also an effective way to solve my country's energy shortage. The offshore riser is an important part of the production and transportation system of deep sea oil and gas fields. Due to the deep water depth of deep-sea oil and gas exploitation, the length of the offshore riser is often thousands of meters, and its movement characteristics are very comp...

AI Technical Summary

Problems solved by technology

The paper "Experimental investigation of vortex-induced vibration of long marine risers" in the 21st issue of "Journal of Fluids and Structures" in 2005 (experimental research on vortex-induced vibration of slender marine risers) used glass fiber reinforced plastics to make spiral strake suppression pipes The model adopts one-time molding technology during processing, which directly leads to high test costs

The paper "Investigation on the effectiveness of helical strikes in suppressing VIV of flexible riser" in the 44th issue of "Applied Ocean Research" in 2014 (experimental research on the effect of spiral strakes on vortex-induced vibration suppression of slender flexible risers) used polychloride The suppression pipeline model was made of vinyl material, and the spiral strakes were pasted in a simple way artificially, so the accuracy of the pitch is difficult to guarantee

Due to the complicated bonding work of the helical strakes on the outer surface of the marine riser in the laboratory, it directly leads to the difficulty in ensuring the accuracy of the pitch of the pipeline model in actual operation or the high cost of the test, which will even affect the authenticity and quality of the experimental research results. reliability

Images