Design of a High Pressure Relief Valve Comprised of Composite and Plastic Materials

2013 ◽  
Author(s):  
Adam Sederlund ◽  
Gary Krutz
Keyword(s):  
High Pressure ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Pressure Relief ◽  
Plastic Materials

Dynamic Performance of Spring-Loaded Pressure Relief Valve for High Temperature and High Pressure Steam

2016 ◽  
Author(s):  
Liu Yang ◽  
Chao Wang ◽  
Jian Zhang ◽  
Ronghua Lu ◽  
Xinhai Yu
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Dynamic Performance ◽  
Steam Pressure ◽  
Pressure Relief Valve ◽  
Small Scale ◽  
Relief Valve ◽  
Pressure Relief ◽  
High Pressure Steam ◽  
Pressure Steam

In this study, the complete dynamic performance of the high temperature and high pressure steam pressure relief valve (HTHP PRV) from pop up to reseating was simulated by CFD software which combined with moving mesh capabilities and multiple domains. An experimental setup was established for the testing of HTHP PRV in accordance with the standard of ASME PTC 25. The dynamic performance of HTHP PRV was recorded accurately. For the transient simulation of HTHP PRV, a domain with opening boundaries connected to the outlet of PRV was proposed to avoid the direct definition of the pressure at the PRV outlet and handle the critical flow. It also can describe the surrounding flow field and help us to understand the influence of the PRV discharge on the environment better. The simulation results were verified by experimental ones. The resultant force on the disk and the lift were monitored and analyzed. A detailed contour of the compressible steam flowing through the HTHP PRV was obtained, including small scale flow features in the back pressure chamber. The effect of the adjusting sleeve on the dynamic performance of HTHP PRV was also investigated in details. The blowdown increases linearly by 0.163% with the adjusting sleeve moves by each millimeter in the direction of departing from the disk. This study sheds a light of understanding of the dynamic characteristics of HTHP PRV.

Numerical Simulation of Pressure Transients in a PWR Main Steam Line System Due to Quick Operations of Pressure Relief Valve

2009 ◽  
Author(s):  
Jong Chull Jo
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Steam Line ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Pressure Relief ◽  
Pressurized Water ◽  
Line System ◽  
Main Steam Line ◽  
Main Steam

At a PWR (pressurized water reactor) nuclear power plant in Korea which was under being retrieved from the zero reactor power after a periodic overhaul in 2005, manual operation for opening the PORV (power operated pressure relief valve) was tried at a low speed to reduce pressure in the MSL (main steam line). Initially, one MSIV (main steam isolation valve) and five MSSVs (main steam safety valves) installed to the MSL remained all closed. To speed up the pressure reduction, the reactor operator in charge abruptly switched the operation mode from “Manual” to “Auto.” Just after the valve was opened fully in a very short time, rapid reduction of pressure in the MSL occurred. A little later on, the operator closed the valve quickly to mitigate the unexpected transient occurrence. In consequence of the result of the sudden discharge of high pressure steam to the atmosphere through the PORV, a curved pipe spool in the downstream was separated from both connections and blasted away into air. Then it collided with the outer wall of the RWST (refueling water storage tank) located about 50 m away, resulting in mechanical damage on it with the maximum permanent deformation of about 60 mm in the radial direction at a local part of wall. This paper describes a numerical simulation of the transient pressure responses to the quick opening and subsequent closing operations of the PORV on the PWR MSL initially maintained as a closed system at a high pressure, which has been performed to illustrate the incident scenario as well as to demonstrate its root cause. For computational efficiency, the pressure field to be solved has been modeled with a two-dimensional mathematical formulation. As the result, the simulation has shown realistically how the incident was initiated and developed.

Optimization of Operation Parameters for Direct Spring Loaded Pressure Relief Valve in a Pipeline System

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Hyunjun Kim ◽  
Sanghyun Kim ◽  
Youngman Kim ◽  
Jonghwan Kim
Keyword(s):  
Pressure Relief Valve ◽  
Pipeline System ◽  
Relief Valve ◽  
Pressure Relief ◽  
Computational Costs ◽  
Constant Degree ◽  
System A ◽  
Disk Mass ◽  
Analysis Scheme ◽  
Surge Control

A direct spring loaded pressure relief valve (DSLPRV) is an efficient hydraulic structure used to control a potential water hammer in pipeline systems. The optimization of a DSLPRV was explored to consider the instability issue of a valve disk and the surge control for a pipeline system. A surge analysis scheme, named the method of characteristics, was implemented into a multiple-objective genetic algorithm to determine the adjustable factors in the operation of the DSLPRV. The forward transient analysis and multi-objective optimization of adjustable factors, such as the spring constant, degree of precompression, and disk mass, showed substantial relaxation in the surge pressure and oscillation of valve disk in a hypothetical pipeline system. The results of the regression analysis of surge were compared with the optimization results to demonstrate the potential of the developed method to substantially reduce computational costs.

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