NDLI: Confirmation of Validity of Hot Tapping Welding

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ogayu, Yasushi
Copyright Year	2009
Abstract	Branch connection to existing hydrocarbon pipelines are often attached by welding on the pipe while liquid or gas products are contained in or flowing in the pipe when it is not feasible, or impractical, to take the piping out of service. This procedure is called hot tapping. A problem, so-called “burn-through”, will occur when welding onto a pressurized pipe if the un-melted area beneath the weld pool has insufficient strength to contain the internal pressure of the pipe. It is reported by Battelle Institute that this burn-through problem will occur when inside surface temperature is in excess of 982 degree C regardless of internal pressure [1]. From the safety view points, this problem shall be avoided. In addition, the piping or equipment base metal thickness must provide support for the new connection and hot tapping machine. From these reasons, the minimum base metal thickness of approximately 5mm (to be precise 4.8mm) is recommended [2]. In this study, the validity of the minimum base metal thickness of 5mm was confirmed by means of “Thermal Analysis Computer Modeling for Hot-Tap Welding” developed by my company to confirm the effectiveness of the Thermal Analysis. This thermal Analysis can calculate the cooling rate and temperatures faithfully using heat elastoplastic finite element analysis. After the confirmation of that, we can determine the welding conditions and conduct the hot tapping operations safer. Prior to applying this thermal analysis tool to hot tapping models, reliability of this thermal analysis tool was confirmed by a preliminary experiment.
Sponsorship	Pressure Vessels and Piping
Starting Page	175
Ending Page	179
Page Count	5
File Format	PDF
ISBN	9780791843703
DOI	10.1115/PVP2009-77072
e-ISBN	9780791838549
Volume Number	Volume 7: Operations, Applications and Components
Conference Proceedings	ASME 2009 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2009-07-26
Publisher Place	Prague, Czech Republic
Access Restriction	Subscribed
Subject Keyword	Temperature Cooling Welding Computer simulation Pipelines Pressure Machinery Base metals Heat Thermal analysis Finite element analysis Safety Reliability Pipes
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in