钢接触网立管焊接疲劳试验

im体育APP’s pipeline testing facilities perform 疲劳测试 on steel catenary risers in our laboratory and on-site at the point of fabrication. Our testing containers can quickly be mobilized to various locations, making im体育APP both flexible and faster than any other testing provider on the market.

Offshore oil companies commonly employ 钢 Catenary Risers (SCRs) as a means of connecting surface installations with subsea pipelines. 钢 catenary risers are subject to harsh environmental conditions that include cyclic loading as a result of wind and wave motion, 潮汐流, 涡激振动, 温度和压强的操作变化.

这些条件使焊缝形成, 以及其他应力集中的特征, 使用时对疲劳开裂敏感. 以减轻过早的故障，而在服务, fabricators are often required to test the 乏力 resistance of any proposed weld procedures before their use in SCR installations.

焊缝疲劳试验

Two approaches are used to assess the 乏力 sensitivity of welds; small-scale testing on extracted coupons, 对整个焊缝进行全面测试;

• 小规模的测试，虽然更便宜，但也有一些局限性. The residual stress profile of the weld is altered by coupon extraction, the applied stress profile is not representative of operation, and it can miss stress-sensitive features present in the original weld. 
• 全面的测试, 相反, allows the entire weld to be tested without alteration to its stress profile, using rotating bending stress that more accurately simulates the stress conditions seen in service. This stress can be applied by using large equipment to mechanical bend the welded pipe string, or by vibrating the test string near its natural resonant frequency (near resonance method). The advantage of this is that it can produce high-stress ranges in samples using relatively small, 低功率振动电机. 它测试了360度的周长焊缝, and it can provide higher cycle frequencies (generally: 25-30 Hz), 这加快了测试速度. 

im体育APP的移动疲劳测试解决方案

im体育APP的共振 疲劳测试 rigs are fully integrated into modified shipping containers, 使钻机自给自足, 模块化, 和移动. All containerized test rigs are capable of testing pipe strings ranging from 4.0米至10米.长度0米, 外径(OD)达24英寸(610毫米), while fixed rigs have the capacity to test beams with outside diameters up to 38 inches (965.2mm).

All rigs use state-of-the-art software developed in-house by im体育APP, which allows precise control of system parameters during testing, 如管道变形, 温度, 测试周期. Each container is equipped with its internal lifting system, 以及所有必要的设备, 测试和卸载准备好的测试字符串.

The containerized design has several benefits over conventional lab-based models:

• 它允许每个钻机 移动, allowing for quick and easy mobilization between im体育APP and Client sites.
• 它创建了一个 内在的障碍 between the test equipment and personnel by limiting access and improving security, 同时也增加了操作人员和现场工作人员的安全.
• 它使测试能够 远程监控 through the use of external workstations and CCTV cameras.
• It 消除了头顶吊装的需要 during sample loading due to the presence of integrated dual hoist systems.
• It allows the rigs to be located in uncovered areas outside of site buildings, 腾出宝贵的空间.

To find out how our experts can advise on weld 疲劳测试 on catenary risers, 或者要求报价, im体育APP 今天.