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Technology Review

Pipeline Valves Technology, Material Selection, Welding and Stress Analysis

[+] Author and Article Information
Karan Sotoodeh

Sandakerveien 41, APT. 402 Oslo, 0477 Norway
karan_sqi@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4040139 History: Received February 22, 2018; Revised April 23, 2018

Abstract

Pipeline valves are the largest, heaviest, and most important valves on an offshore platform with long delivery time. A 30" pipeline ball valve in class 1500 and carbon steel body material was chosen for stress analysis in this paper. The valve was connected to the pipeline through pup pieces from both sides. The pup pieces were connected to the body of the valve through transition pieces The valve is designed based on the American Petroleum Institute (API) 6D Specification for Pipeline and Piping valves. The proposed formula of wall thickness calculation in this paper is based on the American Society of Mechanical Engineers (ASME) Section VIII, division 2, Boiler and Pressure Vessel Code (BPVC) instead of the ASME B16.34 standard. The wall thickness values given in the ASME B16.34 standard of "Valves Flanged, Threaded and Welding End" are very conservative and thick, which makes pipeline valves heavier and more expensive. These valves should withstand loads from pipeline systems such as axial, torsion, and bending moments. ASME B16.34 does not specify the body wall thickness of the pipeline valves under the pipeline loads and moments. This paper aims to create a model to prove that the 30" class1500 pipeline valve will withstand the loads and moments even if the thickness of the valve is calculated based on ASME Section VIII, division 2. The criteria and the model used to prove the suitability of the valve against the loads and moments are based on ASME Section VIII, division 2.

Copyright (c) 2018 by ASME
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