1、274 M HW 2012-3-16 10:47:56yyyyyy http:/ 5 + y e?S1 p s5i vs 5_s yN s Y| 3 v_b 5 s1o E5r MT1 Z r 5_ #r 5_w b -5i_M t Hi 5 3_M HQT b “ - 5 s (L Er 5T s5 K7E5LW ! yN1% 5 B ! W = r %r W5b1 sY a #T/ 5h Y5b Er 5MT V7 sT h Y5q)A|r W !l h Y u Er 5 5 sZE b S F0Bs “ 2 Fv + + S F? K i b 5 sZE % cI| 1000-82412
2、01204-0274-05K1 5vs 5 s5 1o E5r MTbS= bu LC 5_MM) h _ VYV T 9LC“ u u 9 h r 4_ ) 5r MM E % LBb E % | %r 5M1“ VYVKvM LNr b 5 s em m r 5MQ1“ 5 s H r 3_ y b 5 sZELiu Shiaoet alStress analysis method of buried pipelinem 3r 5_K 5 h YM M m 55 US“5Lr yArs7 Ka Pa K b Tr M5Y v I nr Y Tr M5 vY 5 V r b r 9 _a _
3、 a _ _/Z_ $“BTMBXTLZFUBMSJDUJPOBOECFBSJOHMPBETPOCVSJFEQJQFT4PDJFUZPG1FUSPMFVN when the tank at the edge of a tank group suffers from leakage, the gas diffusion rate is higher with a larger infl uence area; when the leakage direction is vertically upward or vertically downward, the gas accumulates ea
4、sily in the tankfarm around the leakage opening, of which gas volume fractions can quickly reach the explosive limit, causing great risk. The research results can provide a reference to the development of emergency rescue plans for hazardous materials in tankfarm.Key words: oil tankfarm, heavy gas,
5、leakage, diffusionZhou Ning: Ph.D, associate professor, born in 1977, graduated from China University of Science and Technology, engineering mechanics with a doctors degree in 2007, mainly engaged in the research and teaching of oil Email:TRANSPORTATION PROCESS / DESIGN Email:Calculate the failure p
6、robability of urban gas pipeline based on Bayesian network modelHao YongmeiXing ZhixiangShen Minget alOGSTVol. 31 No. 4pp. 2702734/25/2012. ISSN 1000-8241 In ChineseBayesian network has a powerful processing capacity and the capacity in self-learning and upgrading on the uncertain problems. Applicat
7、ion of Bayesian network software can improve the effectiveness of risk prediction related to the network. In a urban gas pipeline case, Bayesian network-based model for the failure probability of urban gas pipeline is built to calculate the failure probability of polymorphism top event and structura
8、l importance containing failure factors by HUGIN and MSBNX software tools. By means of BNs reasoning ability, single-factor and two-factor corrections on the natural destruction factor and corrosion factor which cause failure of pipeline are respectively given. Corrected Bayesian network model is mo
9、re able to meet the actual conditions, which allows for better practical signifi cance in improving the systematicness, predictability and accuracy in failure quantitative analysis of urban gas pipeline, and also refl ects the unique advantage and applicability of the Bayesian network in dealing wit
10、h complex system risk analysis.Key words: urban gas pipeline network, Bayesian network, probability analysisHao Yongmei: senior engineer, born in 1970, and graduated from China University of Geosciences, safety engineering, in 1993, mainly engaged in the research and application of oil Email:Stress
11、analysis method of buried pipelineLiu ShiaoPu Hongyu Liu Shuwenet alOGSTVol. 31 No. 4pp. 2742784/25/2012. ISSN 1000-8241 In ChineseMost oil and gas pipelines are buried pipelines, and their stress analysis, different to the process pipelines, mainly depends on the correct simulation of interaction b
12、etween pipeline and soil. In combination with the worlds widely-used design ideas, CAESARII and AUTOPIPE software, this paper explains the theoretical basis and method of discretization for buried pipeline in the stress analysis model of buried 0(45Apr. 25, 2012 Vol.31 No. pipeline, simulates the th
13、eory of interaction between soil and pipeline and the calculation method of related data; analyzes the verifi cation requirements to pipeline stress in ASMEB31.4, ASMEB31.8, and related design codes in China regarding oil and gas pipelines; and deepens the stress analysis method of buried pipeline i
14、n combination with engineering examples, so it will be able to play an active role in pipeline stress analysis work and help to improve understanding of pipeline stress analysis and pipeline stress safety issues.Key words: buried pipeline, stress, binding, soilLiu Shiao: Engineer, born in 1963, grad
15、uated from Southwest Petroleum University, oil Email:Analysis of tensile and bending mechanical properties of offshore fl oating oil hoseXu HuiZhang Caiying Luo Yanshenget alOGSTVol. 31 No. 4pp. 2792822884/25/2012. ISSN 1000-8241 In ChineseOffshore fl oating hose is a combination section fl exible s
16、tructure with a complex manufacturing process, high performance and high cost. Based on the fi nite element method, by the use of ABAQUS software, non-linear relationships between axial tensile load and stretch rate and between curvature and bending moment of fi ve-layer adhesive offshore oil fl oat
17、ing hose under pressure and pressure-free conditions and formation mechanisms are analyzed and calculated. By analyzing the model, stress distribution characteristics for different layers of hose are obtained, and it is pointed out that the adhesive hose still has the non-linear equivalent section s
18、tiffness characteristics due to the non-symmetrical structure feature. Infl uences of spiral reinforcement layout angle, spiral reinforcement diameter, cord thread layout angle of cord thread-rubber composite layers, and other structural design parameters on the hose stretch rate under the axial loa
19、d are analyzed. It is considered that the relevant research results can provide a reference to the design of oil hose. Key words: fl exible adhesive pipe, fl oating hose, composite material, cord thread-rubber composite, tensile stiffness, bending stiffness, mechanical propertyXu Hui: associate prof
20、essor, MS.D, born in 1957, graduated from Tianjin University, ship and ocean engineering, in 1990, engaged in the ship and ocean engineering risk analysis and large-scale structures reliability design. Add: Ship and Ocean Engineering Laboratory of Tianjin University, Tianjin, 300072, P. R. China.Tel
21、: 13803018968; Email:Criterion for pipeline AC interference corrosion in the public energy corridorHao HongnaLi ZiliYi Hualeiet alOGSTVol. 31 No. 4pp. 2832884/25/2012. ISSN 1000-8241 In ChineseConstruction of high-voltage power lines and AC electrified railways speed up the formation of utility ener
22、gy corridor. This causes AC interference corrosion problems due to being crossed with, parallel to, or near buried oil and gas pipelines, which may threaten the safe operation of pipeline. Criterions and relevant standards for AC interference corrosion are promulgated in countries worldwide. For pip
23、eline systems without cathodic protection (CP), AC induction voltage and AC current density are more likely to be used. For pipeline systems with CP, the density ratio between AC current and DC current is more likely to be used. For new pipeline systems, the most direct method for avoiding AC interf
24、erence corrosion in the public energy corridor is to remove AC interference sources from high-voltage power lines, electrifi ed railways and other buried pipelines. For in-service pipeline systems, the AC interference corrosion is reduced by shielding or draining measures, or other measures. There a
25、re still many cognitive gaps to be fi lled on the effects of AC corrosion on CP systems and the use of AC voltage or AC current density for evaluation of AC corrosion rates. Meanwhile, standards for safe distance between high-voltage power lines, electrifi ed railways, and oil Email:EXPERIENCE EXCHA
26、NGE / ENERGY SAVING & ENVIRONMENT PROTECTION / ENGINEERING ECONOMYApplication of solar energy and heat pump technology in oil heating systemPei JunfengandChen GuangminOGSTVol. 31 No. 4pp. 2892914/25/2012. ISSN 1000-8241 In ChineseOil or gas-fi red heaters used to heat crude oil will result in energy waste and environmental pollution. A high-temperature heat pump which takes the solar energy and heat from re-injected water heat exchange as the low-temperature heat source and electric heater as the alternative
