Determination of reliability parameters for means of measurement during use

1982 ◽  
Vol 25 (8) ◽  
pp. 632-636
Author(s):  
V. S. Svintsov
Keyword(s):  
Reliability Parameters ◽  
Means Of Measurement

Quantitative Determination of Safety Integrity Level on Offshore Metering and Custody Transfer Facility

2003 ◽  
Author(s):  
Alejandro Di´az-Herna´ndez ◽  
Mari´a Eloisa Pe´rez Medina ◽  
Rafael Melo Gonza´lez
Keyword(s):  
Petroleum Industry ◽  
Fault Tree Analysis ◽  
Insurance Companies ◽  
Minimal Cut Sets ◽  
Reliability Parameters ◽  
Safety Integrity Level ◽  
Primary Element ◽  
Oil Tanker ◽  
Innovative Concept

A quantitative way for determining the Safety Integrity Level of Safety Instrumented System (SIS) on Offshore Metering and Custody Transfer Facility in Campeche Bay Mexico is presented in this work. The methodology that was employed in order to assess and determine the Reliability parameters of SIS; which was carried out in three steps: 1. Identify undesirable events that can damage to personnel using the API-14C and to, the facility and the environment (by oil spill in hoses when the oil tanker is filled), 2. Estimate the severity and consequences of risk, using safety layer matrix of ISA S84.01 and, 3. Quantify the severity of each risk identified with the fault tree analysis. This last step uses the minimal cut sets, an innovative concept in petroleum industry, this provides valuable information about possible combinations of fault events, that can result in a critical failure of the system. The period of maintenance of the main SIS components (sensors, logic solver and final element), was reduced applying redundancy in the primary element. Furthermore, the results obtained of this analysis can be used by insurance companies or institutions that certify under standards of process quality and safety.

Determination of thermal stress in concrete pavements by means of measurement of in-situ strains

Strain ◽  
1982 ◽  
Vol 18 (1) ◽  
pp. 15-27 ◽  
Author(s):  
TU HSIANG-TE
Keyword(s):  
Thermal Stress ◽  
Concrete Pavements ◽  
Means Of Measurement

Determination of the loss from metrological failure in means of measurement during product quality testing

1981 ◽  
Vol 24 (10) ◽  
pp. 903-905
Author(s):  
�. V. Min'ko ◽  
V. A. Poz ◽  
O. E. Lysov
Keyword(s):  
Product Quality ◽  
Means Of Measurement ◽  
Quality Testing ◽  
Metrological Failure

Determination of the Bearing Quality by Means of Vibroacoustic Response

2015 ◽  
Author(s):  
Stanislav Ziaran ◽  
Milos Musil ◽  
Ondrej Chlebo
Keyword(s):  
Quality Evaluation ◽  
Dynamical Response ◽  
Frequency Interval ◽  
Maximum Acceleration ◽  
Operational Conditions ◽  
Means Of Measurement ◽  
Damage Type ◽  
The Given

A signal of mechanical and acoustical vibration generated during a bearing’s quality testing contains variety of useful information about their operational conditions. At defined testing speeds, the bearings generate a periodical and a non-periodical vibroacoustic signal of different intensities, which are dependent on the quality of bearings and/or their damage type. A dynamical response of the tested bearings recorded in time characterizes also the nature of the unwanted noise of bearings. Therefore the dynamical response of the maximum acceleration recorded in time is one of the major criteria of bearing quality evaluation in terms of noisiness. The second criterion is a determination of statistically significant frequency interval for the equivalent acceleration value expressed in decibels. Consequently, from the effective acceleration value, the bearing quality can be determined in terms of its vibration severity, as well as its noise level. This objective methodology substitutes the evaluation bearing quality by means of measurement of the vibration acceleration on the given test device and simultaneously evaluation of the noise quality and its intensity auditorily. Verifying the proposed methodology 100 % conformity was achieved between the methodology currently used and the new methodology, which eliminates the subjective quality evaluation of bearings auditorily.

scholarly journals Determination of Ra-226 by means of measurement of Rn-222 radioactivity with a proportional counter.

RADIOISOTOPES ◽  
1975 ◽  
Vol 24 (3) ◽  
pp. 193-196 ◽  
Author(s):  
Katsuaki KAMETANI
Keyword(s):  
Proportional Counter ◽  
Means Of Measurement

scholarly journals Various Methods for Measurement of Resistive Leakage Current of Metal Oxide Surge Arrester

2021 ◽  
pp. 81-89
Author(s):  
Prof. Samruddhi Shaha ◽  
Yaseen Khan Anwar Khan Dakhani
Keyword(s):  
Metal Oxide ◽  
Leakage Current ◽  
Partial Discharges ◽  
Measuring Instrument ◽  
Means Of Measurement ◽  
Uneven Heating

Metal Oxide Surge Arrester (MOSA) does not require any ordinary maintenance. But MOSA is get affected from ageing due to the effect of discharging impulse currents, uneven heating and internal partial discharges. A leading cause of deterioration is ingress of moisture. The degradation of MOSA also correlated with the ageing level of the arrester. This is called degradation under surge. The ageing level with the degradation of MO surge arrester or the leakage current of the surge arrester is related to each other. The leakage current is directly proportional to the ageing level. If the ageing level is raise, the leakage current also will increase. So, various methods for determination of the condition of ZnO surge arrester by means of measurement of the arrester leakage current are discussed. A MSCM method, which is based on leakage current of the surge arrester presented. The measuring instrument Leakage Current Monitor is also discussed.

scholarly journals Determination of reliability parameters of HPL and VPL technical safety in the procedure of a non-precision landing approach NPA GNSS with using GPS and GLONASS navigation systems in air transport

2018 ◽  
Vol 188 (2) ◽  
pp. 176-186
Author(s):  
Kamil Krasuski ◽  
Damian Wierzbicki
Keyword(s):  
Air Transport ◽  
Security Level ◽  
Navigation Systems ◽  
Technical Standards ◽  
Reliability Parameters ◽  
Safety Parameters ◽  
Precision Landing ◽  
Technical Safety

The paper presents the results of determining the HPL and VPL safety parameters used to evaluate the reliability of aircraft positioning in air transport. The HPL and VPL security level parameters were determined using GPS and GLONASS systems for the NPA GNSS non-precision landing approach. The work also compares the HPL and VPL values with the technical standards published by ICAO.

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