The Drill & Tap (D&T) repair process has been used commonly in the Refinery, Petrochemical and Chemical plant sectors (Downstream) for more than 60 years. D&T repairs have been performed effectively and safely to repack valves of various types. One of the unique characteristics of a D&T repair is that it is performed under pressure with the line still in service, allowing the valve owner/end user to continue normal plant operations. Additionally, when performed properly while using an injectable packing, the valve remains operable and basic maintenance of the valve (tightening of Gland Flange Studs) can be continued as with traditional packing.
To read the full Valve World Americas tech talk, visit: https://www.valve-world-americas.com/webarticles/2020/06/04/a-fresh-perspective-on-the-use-of-the-drill-and-tap-process.html