{"product_id":"l52058-evaluation-of-preheat-requirements-for-in-service-welding-1","title":"L52058 Evaluation of Preheat Requirements for In-Service Welding","description":"\u003cp\u003eAccurate control of preheat is often required during pipeline welding, both for new construction and for in-service welding (repairs and hot tapping). Conventional methods of applying preheat, such as gas torches, are difficult to control, and can be slow and inefficient. Additionally, the rapid cooling associated with in-service pipelines tends to limit the effectiveness of any form of preheat. New equipment for induction preheating offers the possibility of achieving excellent levels of control together with high thermal efficiency, rapid response, and minimal disruption of accessibility to the weld joint.\u003c\/p\u003e\n\n\u003cp\u003eThe objective of this project was to develop guidelines for preheating welds made onto in-service pipelines and determine the capabilities and limitations of methods of applying preheat using equipment suitable for in-service applications. Field trial experiments were carried out on a 34-in. (863.6-mm) diameter × 0.281-in. (7.1-mm) wall thickness crude oil pipeline to compare the performance of induction preheating and flame preheating under actual in-service conditions. In general, induction heating was found to be much more effective than flame heating. The field trial produced some interesting insights into preheating for in-service welding applications in general and the use of induction heating for this purpose in particular. Guidance was developed pertaining to the appropriate preheat.\u003c\/p\u003e","brand":"PRCI Store","offers":[{"title":"Default Title","offer_id":44367622471758,"sku":"15237","price":95.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/prci-store.myshopify.com\/products\/l52058-evaluation-of-preheat-requirements-for-in-service-welding-1","provider":"PRCI Store","version":"1.0","type":"link"}