General Considerations

2021 ◽  
pp. 11-15
Author(s):  
Charles Becht
Keyword(s):  
High Pressure ◽  
Elevated Temperature ◽  
High Purity ◽  
Normal Category ◽  
Piping Systems ◽  
Lower Hazard

The Code includes six categories of fluid service, which provides a means of discriminating among possible degrees of hazard. Less stringent design, examination, and testing are permitted for fluid service of lower hazard (Category D) and more stringent requirements are applied for more hazardous fluid service (Normal, Category M, Elevated Temperature and High Pressure). High Purity fluid service provides requirements needed for piping systems requiring a certain level of cleanness.

High-Pressure Gelatinization of Barley Starch at Low Moisture Levels and Elevated Temperature

1993 ◽  
Vol 45 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Jukka Vainionpää ◽  
Pirkko Forssell ◽  
Teija Virtanen
Keyword(s):  
High Pressure ◽  
Elevated Temperature

scholarly journals High pressure synthesis of BN and BCN crystals and their functionalization

2014 ◽  
Vol 70 (a1) ◽  
pp. C751-C751
Author(s):  
Takashi Taniguchi
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Purity ◽  
Chemical Vapour ◽  
Attractive Potential ◽  
Luminescence Spectra ◽  
Hard Material ◽  
High Temperature Annealing ◽  
Electrical Insulator ◽  
Carbon Impurity

Hexagonal BN (hBN) and cubic BN (cBN) are known as the representative crystal structures of BN. The former is chemically and thermally stable, and has been widely used as an electrical insulator and heat-resistant materials. The latter, which is a high-density phase, is an ultra-hard material second only to diamond. Recently, some progresses in the synthesis of high purity BN crystals were achieved by using Ba-BN as a solvent material at high pressure crystal growth [1]. Band-edge natures (cBN Eg=6.2eV and hBN Eg=6eV) were characterized by their optical properties. The key issue to obtain high purity crystals is to reduce oxygen and carbon contamination in the growth circumstances. It should be emphasized that hBN exhibits attractive potential for deep ultraviolet (DUV) light emitter [2 ] and also superior properties as substrate of graphene devices [3]. In this study, the effect of carbon impurity in BN is investigated. Three types of experimental approaches were carried out; (1) synthesis of high purity hBN single crystals and its characterization with respect to residual carbon, (2) high temperature solid state diffusion of carbon into hBN and its characterization, and (3) high temperature annealing of turbostratic B-C-N(t-BCN) compound under high pressure. t-BCN flakes obtained by chemical vapour deposition process was annealed near 3000C and 2GPa so as to become well crystallized.At annealing near 3000C at 2GPa with graphite, carbon incorporation of 1E21/cm3 in hBN was achieved with exhibiting totally different Cathode Luminescence spectra feature with high purity hBN crystals. Since major carbon contribution may affect the crystal structure of the 2-D layers stacking in hBN system, phase stability of BCN ternary phase will be introduced by the experimental results of high temperature annealing. Furthermore, effect of carbon impurity upon the synthesis of wurtzite BN from highly crystalline hBN via martensitic phase transformation will also be introduced.

scholarly journals The significance of self-annealing at room temperature in high purity copper processed by high-pressure torsion

2016 ◽  
Vol 656 ◽  
pp. 55-66 ◽  
Author(s):  
Yi Huang ◽  
Shima Sabbaghianrad ◽  
Abdulla I. Almazrouee ◽  
Khaled J. Al-Fadhalah ◽  
Saleh N. Alhajeri ◽  
...  
Keyword(s):  
High Pressure ◽  
High Purity ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Purity Copper

scholarly journals 250 kWth high pressure pilot demonstration of the syngas chemical looping system for high purity H2 production with CO2 capture

2018 ◽  
Vol 230 ◽  
pp. 1660-1672 ◽  
Author(s):  
Tien-Lin Hsieh ◽  
Dikai Xu ◽  
Yitao Zhang ◽  
Sourabh Nadgouda ◽  
Dawei Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Co2 Capture ◽  
High Purity ◽  
H2 Production ◽  
Chemical Looping

Sufficiency of Reference Stress Solutions for FFS Evaluation of Crack-Like Flaws

2017 ◽  
Author(s):  
Kenji Oyamada ◽  
Naoki Miura
Keyword(s):  
High Pressure ◽  
Elevated Temperature ◽  
Comparative Study ◽  
Assessment Procedure ◽  
Bending Stress ◽  
Draft Guideline ◽  
Membrane Stress ◽  
Reference Stress ◽  
Standard Development

In Japan, a new standard of an assessment procedure for crack-like flaws in pressure equipment at elevated temperature is now under development in the High Pressure Institute of Japan (HPI). In this standard development, it is needed to adopt reference stress solutions for crack-like flaws in pressure equipment being subjected to membrane stress and/or bending stress. Such reference stress solutions have been proposed in various references such as ASME FFS-1/API579-1, BS7910, R5, FBR draft guideline, HPIS Z101-2, etc. A comparative study of those reference stress solutions was conducted in order to select appropriate one. As a result, reference stress solutions in HPIS Z101-2 were adopted. The sufficiency of adopted reference stress solutions was introduced in this paper. Also, the reference stress solutions for axially and circumferentially through-wall rectangular flawed cylinders, which were not provided in the HPIS Z101-2 standard but were utilized to derive those solutions adopted in the standard, were introduced in this paper. These solutions should be adopted in a new HPI standard for crack-like flaws in pressure equipment at elevated temperature.

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