Session: DA-01-01 The Roger F. Reedy Memorial Symposium on Design & Analysis of Pressure Vessels and Components - 1

Paper Number: 106176

106176 - Application of Code Cases 2951 and 2964 for Elevated Temperature Design of Pressure Vessels Considering Load Durations 

The rules of ASME B&PV Section VIII Code provide (i) allowable tensile stress at elevated temperatures based on time duration of 100,000 hours; (ii) external pressure charts which do not account for reduction of buckling strength due to creep under short or long-term loads. For short term operating conditions for which component design governed by an allowable tensile stress based on long term (100,000 hours) creep properties is unrealistically conservative and may be non-conservative in the case of very long load durations (>100,000 hours). At elevated temperatures, the allowable compressive stress depends on magnitude of load and duration. The newly released code cases, Case 2951 ‘Alternative Approach for Operating Conditions (Including Occasional Loads) in the Time-Dependent Regime’ and Case 2964 ‘Allowable Compressive Stress in the Time-Dependent Regime’ provide procedures for elevated temperature design of pressure vessels considering load durations. In this paper, for successful implementation of these code cases, the key variables are reviewed and the inherent assumptions made in the development of these code cases are highlighted. Also, the code cases are applied for design of typical pressure vessel components and the results are compared with other relevant procedures which consider load duration into account.

Keywords: Elevated temperature, external pressure charts, pressure vessels, creep, load duration, code case 2951, code case 2964.

Presenting Author: Balaji Srinivasan ENGINEERS INDIA LIMITED

Presenting Author Biography: Mr. Balaji Srinivasan, Assisstant General Manager, has been working with Engineers India Limited, India, for past 15 years. He is ME in Engineering Design from Anna University (2007), Chennai, India. He is involved in linear and nonlinear analysis of various critical components, systems including pressure vessels, stiffened tanks, heat exchangers and piping components. He has carried out the advanced finite element analysis including transient thermal, fatigue, creep and creep-fatigue interaction analysis of pressure vessels, piping components, high pressure and high temperature reactors, coke drums, dryers, agitator vessels etc. His current area of interest includes creep-fatigue resistant design of high pressure-high temperature reactors, digital twins.

Authors:

Gurumurthy Kagita Engineers India Limited
Mahesh Babu Addala ENGINEERS INDIA LIMITED
Penchala Sai Krishna Pottem ENGINEERS INDIA LIMITED
Balaji Srinivasan ENGINEERS INDIA LIMITED
Venkat Krishnakant Pudipeddi ENGINEERS INDIA LIMITED
Subramanyam v.r.sripada ENGINEERS INDIA LIMITED