ASME Code Safety Valve Rules—A Review and Discussion

1995 ◽  
Vol 117 (2) ◽  
pp. 104-114 ◽  
Author(s):  
M. D. Bernstein ◽  
R. G. Friend
Keyword(s):  
Pressure Vessel ◽  
Safety Valve ◽  
Code Design ◽  
Pressure Relief ◽  
Pressure Tolerance ◽  
Asme Code ◽  
Pressure Relief Valves ◽  
And Function

Safety valve rules, i.e., rules for overpressure protection by the use of various pressure-relieving devices, vary somewhat among the five book sections of the ASME Boiler & Pressure Vessel Code which require such protection. This paper reviews those rules by discussing the following topics: Pressure relief device terminology and function. The problem of overpressure protection. Code rules for overpressure protection: rules for determining required relieving capacity; for allowable overpressure; for set pressure and set pressure tolerance; for blowdown. The various pressure relief devices permitted by the Code. Design of pressure relief valves. How relieving capacities are established and certified. The qualification of pressure relief device manufacturers. Installation guidelines. Concluding remarks.

Development of a Fatigue Design Curve for Austenitic Stainless Steels in LWR Environments: A Review

2002 ◽  
Author(s):  
Omesh K. Chopra
Keyword(s):  
Stainless Steels ◽  
Pressure Vessel ◽  
Type Strain ◽  
Nuclear Power ◽  
Austenitic Stainless Steels ◽  
Environmental Parameters ◽  
Light Water Reactor ◽  
Code Design ◽  
Fatigue Design ◽  
Asme Code

The ASME Boiler and Pressure Vessel Code provides rules for the construction of nuclear power plant components and specifies fatigue design curves for structural materials. However, the effects of light water reactor (LWR) coolant environments are not explicitly addressed by the Code design curves. Existing fatigue strain–vs.–life (ε–N) data illustrate potentially significant effects of LWR coolant environments on the fatigue resistance of pressure vessel and piping steels. This paper reviews the existing fatigue ε–N data for austenitic stainless steels in LWR coolant environments. The effects of key material, loading, and environmental parameters, such as steel type, strain amplitude, strain rate, temperature, dissolved oxygen level in water, and flow rate, on the fatigue lives of these steels are summarized. Statistical models are presented for estimating the fatigue ε–N curves for austenitic stainless steels as a function of the material, loading, and environmental parameters. Two methods for incorporating environmental effects into the ASME Code fatigue evaluations are presented. Data available in the literature have been reviewed to evaluate the conservatism in the existing ASME Code fatigue design curves.

Margins for ASME Code Fatigue Design Curve: Effects of Surface Finish and Material Variability

2003 ◽  
Author(s):  
O. K. Chopra ◽  
W. J. Shack
Keyword(s):  
Pressure Vessel ◽  
Nuclear Power ◽  
Environmental Parameters ◽  
Light Water Reactor ◽  
Code Design ◽  
Low Alloy Steels ◽  
Design Curve ◽  
Fatigue Design ◽  
Asme Code ◽  
Alloy Steels

The ASME Boiler and Pressure Vessel Code provides rules for the construction of nuclear power plant components. This Code specifies fatigue design curves for structural materials. However, the effects of light water reactor (LWR) coolant environments are not explicitly addressed by the Code design curves. Existing fatigue strain-vs.-life (ε-N) data illustrate potentially significant effects of LWR coolant environments on the fatigue resistance of pressure vessel and piping steels. This report provides an overview of the existing fatigue ε-N data for carbon and low-alloy steels and wrought and cast austenitic SSs to define the effects of key material, loading, and environmental parameters on the fatigue lives of the steels. Experimental data are presented on the effects of surface roughness on the fatigue life of these steels in air and LWR environments. Statistical models are presented for estimating the fatigue ε-N curves as a function of the material, loading, and environmental parameters. Two methods for incorporating environmental effects into the ASME Code fatigue evaluations are discussed. Data available in the literature have been reviewed to evaluate the conservatism in the existing ASME Code fatigue evaluations. A critical review of the margins for the ASME Code fatigue design curve is presented.

An Overview of ASME Section III Class 2 and 3 Valve Design and Service Loading Rules

2020 ◽  
Author(s):  
Ronald Farrell ◽  
Jason Lambin
Keyword(s):  
Pressure Vessel ◽  
Working Group ◽  
Historical Perspective ◽  
Local Stress ◽  
Code Design ◽  
Bending Stress ◽  
Valve Design ◽  
Design Rules ◽  
Stress Evaluation ◽  
Asme Code

Abstract In addition to providing an overview of the ASME Boiler and Pressure Vessel Code design rules applicable to Class 2 and 3 valves, where Class is defined in Section III of the ASME Code, Sub-Article NCA-2130, this paper offers some insight as to why the rules are as they are. The motivation comes from a request by the ASME Codes and Standards Committee, Components Subgroup, for the Valve Working Group to prepare this overview. The request came after discussing a question from a participant regarding how the “(Primary Membrane or Local) plus Bending” stress category should be addressed for a valve. The paper goes beyond a basic overview of Code rules as it includes a discussion of the underlying valve standard ASME B16.34, looks at the valve rules in relation with the rest of the Code, and contributes some historical perspective. From a perusal of the Code both in general and during preparation of this paper, it is concluded that the valve Code rules could benefit from a few clarifications; thus, changes are proposed, and the Working Group is encouraged to consider them. In answer to the underlying question regarding the primary local stress category, it is shown that the need for a local stress evaluation would be rare for a valve.

Dynamic Behavior of Transportation Pressure Relief Valves Under Simulated Fire Impingement Conditions

1999 ◽  
Vol 122 (1) ◽  
pp. 60-65 ◽  
Author(s):  
A. J. Pierorazio ◽  
A. M. Birk
Keyword(s):  
Dynamic Testing ◽  
Test Facility ◽  
Time Varying ◽  
Relief Valve ◽  
Pressure Relief ◽  
Flow Rates ◽  
Depth Analysis ◽  
Pressure Relief Valves ◽  
Accident Conditions ◽  
Insight Into

This paper presents the results of the first full test series of commercial pressure relief valves using the newly constructed Queen’s University/Transport Canada dynamic valve test facility (VTF) in Maitland, Ontario. This facility is unique among those reported in the literature in its ability to cycle the valves repeatedly and to measure the time-varying flow rates during operation. This dynamic testing provides much more insight into valve behavior than the single-pop or continuous flow tests commonly reported. The facility is additionally unique in its simulation of accident conditions as a means of measuring valve performance. Specimen valves for this series represent 20 each of three manufacturers’ design for a semi-internal 1-in. 312 psi LPG relief valve. The purpose of this paper is to present the procedure and results of these tests. No effort is made to perform in-depth analysis into the causes of the various behaviors, nor is any assessment made of the risk presented by any of the valves. [S0094-9930(00)01201-4]

Dynamic Instability Analysis of a Spring-Loaded Pressure Safety Valve Connected to a Pipe by Using CFD Method

2018 ◽  
Author(s):  
Feng Jie Zheng ◽  
Chao Yong Zong ◽  
Fu Zheng Qu ◽  
Wei Sun ◽  
Xue Guan Song
Keyword(s):  
Dynamic Instability ◽  
Safety Valve ◽  
Wave Force ◽  
Design Parameters ◽  
Instability Mechanism ◽  
Pressure Relief ◽  
Pressure System ◽  
System Pressure ◽  
And Performance ◽  
Cfd Method

As the ultimate protection of a pressure system, pressure safety valves (PSV) can respond in an instable manner such as flutter and chatter which will affect service life, reliability and performance. In order to study the dynamic instability caused by multi-source forces including the flow force, the spring compressing force and the pressure wave force, a more realistic CFD model containing a PSV and different connected pipes as well as the pressure vessel is developed, in which advanced techniques in Fluent such as User Defined Function (UDF) and Dynamic Layering method are combined to allow the PSV to operate. Based on this model, the process of the valve’s opening and reclosing is monitored to examine the influence of design parameters on the dynamic instability of the PSV. Specifically, the propagation of pressure waves along the connecting pipes is successfully captured, which is of great help to explain the instability mechanism and optimize the design and setup of pressure relief systems.

scholarly journals Design of an on-line check device for safety valve

2018 ◽  
Vol 232 ◽  
pp. 01045
Author(s):  
Zhipeng Yan ◽  
Qing Li ◽  
Muda Jin ◽  
Haijian Zhong
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Safety Valve ◽  
Motor Drive ◽  
Pressure Relief ◽  
Type Safety ◽  
On Line ◽  
Spring Type ◽  
Pulling Force ◽  
Upper Computer

As the main pressure relief component of the tanker, the spring type safety valve is indispensable for its periodic verification. An on-line check device is designed for the check problem of the safety valve. The check device is divided into mechanical structure, program control, motor drive, tension detection, displacement measurement, upper computer, etc., and the safety valve is verified according to the safety valve check principle and the determination method. Compared with the check device that uses the hydraulic system to provide the pulling force, the device has the advantages of simple operation, high speed, convenient disassembly, strong applicability, and the like, and has certain market application prospects.

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