installation and repair of major process equipment

... FOR INSTALLATION, MAINTENANCE, AND REPAIR OF SURFACE SAFETY VALVES AND UNDERWATER SAFETY VALVES OFFSHORE 3 I 5.2 OFFSITE 5.2.1 For continued assurance of quality, an offsite repair REPAIR OF ... Practice for Installation, Maintenance, and Repair of Surface Safety Valves and Underwater Safety Valves Offshore 1.1 One of the means of assuring positive wellstream shut- off is the use of the ... environment, and the safety and health of our employees and the public To make safety, health and environmental considerations a priority in our planning, and our development of new products and processes

Ngày tải lên: 09/12/2018, 11:57

... of thousands of hours Durability Industrial diesel engines come out of a conservative design tradition High ini-tial costs, weight, and moderate levels of performance are acceptable tradeoffs against ... similar cycles, consisting of intake, compression, expansion, and exhaust events Four-stroke-cycle engines of either type allocate one up or down stroke of the piston for each of the four events Two-stroke-cycle ... 30% of the heat liberated from the fuel to turn the crankshaft The remainder goes out the exhaust and into the cooling system and lubricating oil CI engines attain thermal efficiencies of 40% and

Ngày tải lên: 04/07/2014, 14:20

... scale) of the rate of fatigue crack growth per cycle of load da/dN versus the variation of the stress-intensity factor ∆K I . The parameter a denotes crack length, N the number of cycles, and ∆K ... Relation between dimensions of a discontinuity and the parameter ā for surface discontinuities. (Extracts from British Standards Institution 1980. Complete copies of the standard can be obtained ... Association of State Highway and Transportation Officials 1996; American Institute of Steel Construction 1994; EM 1110-2-2105). (5) Integrate the crack growth rate expression (i.e., Equations 6-8 and

Ngày tải lên: 05/08/2014, 11:20

... structural integrity of the spillway gate must be evaluated (a) Since an evaluation of the local buckling of the strut arms was conducted when it was first observed and the amount of buckling on the ... incorporating a factor of safety (FS), K If, is given by       • b FS a FS a 1.12 = where a = crack size k = function of a and b b = half-width of the plate (Tabulated values for k and stress ... exists This indicates that an immediate repair plan should be developed and implemented If the repair will be costly and/or substantially affect the function of the project, a more accurate analysis

Ngày tải lên: 05/08/2014, 11:20

... Structures Steel standards for the period when many hydraulic steel structures were constructed are of interest from both a structural evaluation and a repair and maintenance standpoint In a structural ... fracture and fatigue analysis of this example consists of three propagation steps (1) The first step is to analyze the crack propagation of a hemispheric surface crack having an initial radius of 1.6 ... yield point of 310 MPa (45 ksi) and tensile strength of 552 to 655 MPa (80 to 95 ksi)) through a high level of carbon (0.44 percent maximum) It also had limits on its phosphorus and sulfur contents

Ngày tải lên: 05/08/2014, 11:20

... fracture resistance and fatigue strength, bolted repairs are often preferable to welded repairs However, bolted repairs typically are more expensive and require more time to design and install Dimensional ... cracking problems (see paragraph 8-2a and paragraph 8-3) Repair of corroded areas is discussed in paragraph 8-2b, repair of cracks is discussed in paragraph 8-4, and rivet replacement is discussed ... grinding, peening, remelting, and hole drilling The appropriate repair method for a given situation is dependent on the size and location of the crack and the type of detail at which the cracking

Ngày tải lên: 05/08/2014, 11:20

... type of connection (intersection of bracing members, diaphragms, and girders) is a very common occurrence on lift gates, miter gates, tainter gates, and bridges Flanges of bracing members and ... Cause of cracking The crack was located in the tension flange of the vertical girder at the intersection of the bracket plate and the flange plate The weld that joins the bracket plate and flange ... shown that out-of-plane displacement and rigidity of end connections may also impose flexure in the bracing members (Commander et al 1994) Trang 4Figure 8-6 Cracked girder, diaphragm, and bracing

Ngày tải lên: 05/08/2014, 11:20

... flange at diaphragm of a lift gate (3) Repair alternatives (a) The ideal crack repair would also improve the fatigue strength of the detail and would eliminate the out-of-plane distortion However, ... recommended repair is a combination of crack repair procedures shown in Figures 8-3 and 8-4 First, repair the crack according to Figure 8-4 while following the guidelines for welded crack repair given ... (3) Repair The handrails were repaired with bolted tee and cross fittings fabricated to fit snugly around the intersecting pipes (Figure 8-18) The fittings consist of two pieces that sandwich

Ngày tải lên: 05/08/2014, 11:20

... the lock chamber water level and to opening and closing of gates The number of load cycles is a function of the number of lockages that occurs at the lock The number of load cycles due to gate ... dam and control the release of water Sources of repeated loading include changes in load due to pool fluctuations, operation of the hydraulic steel structure, flow-induced vibration, and wind and ... cracking of a component The most important factors governing the fatigue life of structures are the severity of the stress concentration and the stress range of the cyclic loading The fatigue life of

Ngày tải lên: 11/08/2014, 09:20

... Structures Steel standards for the period when many hydraulic steel structures were constructed are of interest from both a structural evaluation and a repair and maintenance standpoint In a structural ... exists This indicates that an immediate repair plan should be developed and implemented If the repair will be costly and/or substantially affect the function of the project, a more accurate analysis ... estimation of K Ic that may not accurately reflect the plane-strain fracture toughness of the material, and the approximation of K c from K Ic introduces more uncertainty in the estimation of the

Ngày tải lên: 11/08/2014, 09:20

... type of connection (intersection of bracing members, diaphragms, and girders) is a very common occurrence on lift gates, miter gates, tainter gates, and bridges Flanges of bracing members and ... flange at diaphragm of a lift gate (3) Repair alternatives (a) The ideal crack repair would also improve the fatigue strength of the detail and would eliminate the out-of-plane distortion However, ... recommended repair is a combination of crack repair procedures shown in Figures 8-3 and 8-4 First, repair the crack according to Figure 8-4 while following the guidelines for welded crack repair given

Ngày tải lên: 11/08/2014, 09:20

... any SOFC system, the performance of the INER SOFC system is dependent not only on the design and operating conditions of the fuel cell stack, but also on the design and operating conditions of ... provided by the anode off-gas given an anode off-gas temperature of less than 650 oC, a cathode off-gas temperature of less than 390 oC, and a flame barrier temperature of less than 700 oC However, ... heating value of the fuel In the SOFC system at INER, the stack has a potential output power of kW and an electrical conversion efficiency of more the 40% In practice, not all of the fuel which...

Ngày tải lên: 05/09/2013, 16:10

... Printed and bound in the United States of America 69/3830-543210 Printed on acid-free paper SPIN 10868248 TLFeBook For God had not given us the spirit of fear; but of power, and of love, and of a ... Concepts and Designs K.F Man, K.S Tang and S Kwong Neural Networks for Modelling and Control of Dynamic Systems M Nørgaard, O Ravn, N.K Poulsen and L.K Hansen Modelling and Control of Robot Manipulators ... and Director Professor Michael A Johnson, Professor of Control Systems and Deputy Director Industrial Control Centre, Department of Electronic and Electrical Engineering, University of Strathclyde,...

Ngày tải lên: 01/01/2014, 18:38