Relief Tanks: Parameters to Consider When Designing Relief Systems and Connections to Tanks

2020 ◽  
Author(s):  
Emma Perez
Keyword(s):  
Cold Weather ◽  
Transient Pressure ◽  
Relief Valve ◽  
Cold Temperatures ◽  
Oil Storage ◽  
Effects Of Temperature ◽  
Relief System ◽  
And Storage ◽  
Proper Operation ◽  
Stagnant Fluid

Abstract Oil Storage facilities (terminals) are usually designed with a pressure rating lower than the rating of the pipeline transporting the fluids. During abnormal operations, terminal piping can be subject to unexpected transient pressure surges that can exceed the allowed values. Mitigations are required a common one is installing a relief system. When a relief valve is installed, it is connected to a tank and the location of this relief tank is critical for the proper operation of the relief system and the overall mitigation of pressure surges. Relief design needs to take into account the length and layout of the piping. Facilities in the northern hemisphere contain pipes installed above ground and prone to experiencing cold temperatures during winter months. If the fluid is stagnant in these pipes, the cold weather increases the viscosity of the fluid. If the relief valve activates, the fluid that has been stagnant in the pipe needs to be pushed out of the pipe and into the tank. This requires a high pressure from the system and is directly affected by the distance of the pipe and the properties of the stagnant fluid. This paper will show how transient pressures change for length of pipe and for varied viscosities of the stagnant fluid. With these findings, engineers can improve their understanding of the effects of temperature and length on surge pressures and they can design safer systems for liquid transportation and storage.

The Effect of Reduced Design Margin on the Fire Survivability of ASME Code Propane Tanks

2004 ◽  
Author(s):  
A. M. Birk
Keyword(s):  
Pressure Vessels ◽  
Relief Valve ◽  
Pressure Relief ◽  
Mode Of Failure ◽  
Asme Code ◽  
Failure Scenario ◽  
Fill Level ◽  
Relief System ◽  
And Storage ◽  
Design Margin

The design margin on certain unfired pressure vessels has recently been reduced from 4.5 to 4.0 to 3.5. This has resulted in the manufacture of propane and LPG tanks with thinner walls. For example, some 500 gallon ASME code propane tanks have had the wall thickness reduced from 7.7 mm in 2001 to 7.1 mm in 2002 and now to 6.5 mm in 2004. This change significantly affects the fire survivability of these tanks. This paper presents both experimental and computational results that show the effect of this design change on tank fire survivability to fire impingement. The results show that for the same pressure relief valve setting, the thinner wall tanks are more likely to fail in a given fire situation. In severe fires, the thinner walled tanks will fail earlier. An earlier failure usually means the tank will fail with a higher fill level, because the pressure relief system has had less time to vent material from the tank. A higher liquid fill level at failure also means more energy is in the tank and this means the failure will be more violent. The worst failure scenario is known as a boiling liquid expanding vapour explosion (BLEVE) and this mode of failure is also more likely with the thinner walled tanks. The results of this work suggest that certain applications of pressure vessels such as propane transport and storage may require higher design margins than required by the ASME.

Well-Integrated Design of Surge Relief Systems in Oil Storage Facilities

2018 ◽  
Author(s):  
Emma Perez ◽  
Ashishkumar Mehta
Keyword(s):  
Transient Analysis ◽  
Integrated Design ◽  
Initial Pressure ◽  
Design Stage ◽  
Design Parameters ◽  
Operating Pressure ◽  
Relief Valve ◽  
Oil Storage ◽  
Relief System ◽  
Storage Facilities

Oil Storage facilities (terminals) that receive fluids from pipelines or inject fluid into them, are usually designed with a lower pressure rating than the actual pipeline between these facilities. This is mostly due to the fact that the pressure expected in the terminal is much lower than the pressure required to transport the oil. However, these terminals are still subject to pressure surges caused by abnormal transient events during normal operations. In cases where the surge pressures exceed the allowed operating pressure of the equipment, a relief system can be installed to mitigate these surges to acceptable levels. When constructing a new terminal or altering an existing one, the hydraulic calculations of these terminals are generally based on design values of the project, such as maximum and minimum flow rates. The hydraulic studies and simulations that are normally done by companies are based on steady state conditions, however, to design intrinsically safe facilities, the system’s entire operating envelope should be considered at the design stage of the project. Once transient analysis results show the need to install a pressure relief device, the proper location of this equipment is critical for the effectiveness of the surge relief system to mitigate overpressures properly. The effect of flow rate, piping configuration, and initial pressure profiles were simulated and compared to determine their impact on pressure surges and on the critical devices along the flow path. Secondly, simulations were done with the relief system installed in different locations along the terminal pipe and the resulting changes in maximum pressure surges. The objective of this paper is to show the importance of a detailed transient analysis based not only on design parameters but also on operational scenarios to mitigate surge overpressures in a more cohesive manner. The secondary objective of the paper is to discuss key parameters that need to be considered for selecting the location of the surge relief valve to ensure critical devices are safe during the upset conditions. The analysis presented in this paper is applicable across a broad configuration of oil facilities.

Effects of temperature, oxygen exclusion, and storage on the microbial loads and pH of packed ostrich steaks

Meat Science ◽  
2006 ◽  
Vol 73 (3) ◽  
pp. 498-502 ◽  
Author(s):  
Rosa Capita ◽  
Nuria Díaz-Rodríguez ◽  
Miguel Prieto ◽  
Carlos Alonso-Calleja
Keyword(s):  
Effects Of Temperature ◽  
And Storage

scholarly journals Pengaruh kemasan plastik dan suhu penyimpanan terhadap masa simpan buah manggis (Garcinia mangostana L)

2016 ◽  
Vol 1 (1) ◽  
pp. 977-984
Author(s):  
Nurita Agustia ◽  
Raida Agustina ◽  
Ratna Ratna
Keyword(s):  
Shelf Life ◽  
Storage Temperature ◽  
Economic Value ◽  
Garcinia Mangostana ◽  
Cold Temperatures ◽  
Plastic Packaging ◽  
And Storage

Abstrak. Merupakan salah satu komoditi buah-buahan yang memiliki nilai ekonomi dan banyak digemari masyarakat. Manggis merupakan salah satu buah yang memiliki umur simpan yang relatif singkat, setelah itu manggis akan menjadi busuk dan tidak layak lagi bila di simpan di ruangan, Oleh karena itu perlu dilakukan pengemasan dan penyimpanan pada suhu dingin untuk mempertahankan masa simpan buah manggis. Penelitian ini bertujuan untuk melihat pengaruh kemasan plastik dan suhu penyimpanan terhadap masa simpan buah manggis.Abstract. Is one of the commodities fruits that have economic value and much-loved community. Mangosteen is a fruit that has a relatively short shelf life, after that mangosteen will be rotten and unfit when stored in the room, therefore it is necessary for packaging and storage at cold temperatures to preserve the shelf life of the mangosteen fruit. This study aims to look at the effect of plastic packaging and storage temperature on the shelf life of the mangosteen fruit.

Quick Connection Couplings in the Permeated Gas Relief Systems of Flexible Riser End Fittings

2011 ◽  
Author(s):  
Alexandre S. Rabelo ◽  
Antonio M. R. Motta ◽  
Antonio P. G. Romero ◽  
Joa˜o Paulo C. e S. Nunes ◽  
Jose´ A. P. Padilha ◽  
...  
Keyword(s):  
Fluid Injection ◽  
Main Function ◽  
Monitoring And Control ◽  
Flexible Riser ◽  
Relief Valve ◽  
Monitoring And Control System ◽  
Fitting In ◽  
Relief System ◽  
And Control ◽  
Vacuum Testing

The objective of the paper is to present a new conception for the permeated gas relief system of flexible riser end fittings. The new conception is based on a multi-function gas relief system, depending on the requirements established by the operators. The main function of the system is to relief the accumulated gas in the riser annulus. Due to the interconnection of the annulus to the external environment through the top end-fitting, other functions of this system may be required such as to allow fluid injection into the annulus or vacuum testing, for example. The presented conception of the permeated gas relief system is based on the usage of quick connection and disconnection couplings. It was firstly developed focusing the particular cases of submerged top end fittings but it can be applicable in both situations where the riser top end fitting is located either at an emerged or a submerged position. In the course of its development, the conception has led to different patterns of the system, depending on the different required functions. The gas relief system was conceived in order to allow — in an easy and quick manner, without the risk of flooding the annulus with seawater — the execution of typical operations like those required for installing a monitoring and control system, for injecting fluids into the annulus, for vacuum testing or, additionally, for removing any damaged relief valve from the end fitting in order to substitute it for a new one. The paper describes the components of the gas relief system for each required function. The idea is to have many interchangeable items of standardized sets that meet specific requirements, case by case. The performance of the permeated gas relief system is an important issue for flexible riser integrity.

From the history of the problem of oil transportation and storage. Contribution of Shukhov V.G.

2021 ◽  
pp. 50-54
Author(s):  
L. R. Yurenkova ◽  
N. V. Bilash
Keyword(s):  
Oil Industry ◽  
Petroleum Products ◽  
Fuel Oil ◽  
Oil Pipeline ◽  
Oil Storage ◽  
Oil Transportation ◽  
Oil Pipelines ◽  
Steel Tanks ◽  
Cylindrical Steel Tanks ◽  
And Storage

A significant part of the oil consumed in the world is transported from production and processing sites to consumers via tankers and pipelines. According to experts' forecasts, the demand for oil and petroleum products in the coming years will be significantly higher than in 2020. In Russia, the oil transportation market is developing in several directions. The main directions are investing in pipeline transport and improving the design of tanks for storing oil and petroleum products. The article considers the contribution of the great Russian engineer V.G. Shukhov to the solution of the problem of oil transportation and storage and in general to the development of the oil industry. In the article "Oil Pipelines" (1884) and in the book "Pipelines and their application in the oil industry" (1894), V.G. Shukhov gave precise mathematical formulae for describing the processes of oil and fuel oil flowing through pipelines, creating a classical theory of oil pipelines. He is the author of the projects of the first Russian main pipelines: Baku-Batumi with a length of 883 km (1907) and Grozny-Tuapse with a length of 618 km (1928). Shukhov V.G. designed and then supervised the construction of oil pipelines of the companies "Branobel", "G.M. Lianozova and sons" and the world's first heated fuel oil pipeline. Working in the oil fields in Baku, Shukhov V.G. developed the basics of lifting and pumping oil products, proposed a method of lifting oil using compressed air — airlift, developed a calculation method and technology for the construction of cylindrical steel tanks for oil storage facilities.

scholarly journals An Unusual Cold February 2019 in Saskatchewan—A Case Study Using NCEP Reanalysis Datasets

Climate ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 87 ◽  
Author(s):  
Soumik Basu ◽  
David Sauchyn
Keyword(s):  
North Pacific ◽  
Storm Track ◽  
Surface Fluxes ◽  
Cold Weather ◽  
Storm Activity ◽  
Cold Temperatures ◽  
The North ◽  
Cold Snap ◽  
Extreme Cold ◽  
The North Pacific

In February 2019, central Canada, and especially the province of Saskatchewan, experienced extreme cold weather. It was the coldest February in 82 years and the second coldest in 115 years. In this study, we examine National Centers for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR) Reanalysis 1 data to understand the atmospheric processes leading to this cold snap. A detailed investigation of surface air temperature, sea level pressure, surface fluxes, and winds revealed a linkage between the North Pacific storm track and the February cold snap. A shift in the jet stream pattern triggered by the storm activity over the North Pacific caused a high-pressure blocking pattern, which resulted in unusual cold temperatures in Saskatchewan in February. This study demonstrates the potential for extreme cold in a warming climate; weather records in Saskatchewan show an increase in minimum winter temperature by 4–5 °C.

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