tunnel construction and systems

... are typically owned, operated, and maintained by civilian contractors (except for government-owned or -leased pipeline systems) and will vary in size, construction, and operation Additional factors ... Steel Pipelines Crossing Railroads and Highways, and API Std 1104, Welding of Pipelines and Related Facilities 2.4.3 Operations In an emergency and at oversea commands, Air Force personnel may be ... more complete 13 UFC 3-460-03 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com 21 JANUARY 2003 understanding of the design and construction of pipelines, see MIL-HDBK-1022A,...

Ngày tải lên: 20/06/2014, 17:20

... predetermined fill level, and a high-level control valve to shut off the flow of fuel into the tank 4.4.9 Liquid Level Gauge and Low-Level Control A liquid level gauge and low-level control (Figure ... (Vertical) Turbine Pump Pump design is the same for both Types I and II hydrant fueling systems See Chapter for a description and Chapter 10 for maintenance frequencies 5.3 Nonsurge/Check Valve ... liquid level gauge and the lowlevel control prevents withdrawing fuel from the tank below a predetermined level (typically 330 millimeters [13 inches] on underground tanks), and prevents the pump...

Ngày tải lên: 20/06/2014, 17:20

... lines from the F/Ss and pressure relief valves which go to the product recovery tank Blue lines are the pump discharge and hydrant loop, including the BPCV, PCV, and the D/FV Green and red lights ... means Nos 2, 3, and will follow in sequence By selecting #2 as the lead pump, Nos 3, 4, and follow in sequence Other controls include the Emergency Stop Button, and the Test, Reset, and Acknowledge ... They receive power from separate but identical power conditioners and battery systems They operate redundantly and cycle off and on without interruption Only one microprocessor actively controls...

Ngày tải lên: 20/06/2014, 17:20

... element, consisting of air cylinders, heads and pistons, and air inlet and discharge valves A system of connecting rods, piston rods, crossheads, and a crankshaft and flywheel for transmitting the power ... compressed air systems with the same care taken on liquid systems Closed valves should be slowly cracked open and both sides should be allowed to equalize prior to opening the valve further Systems ... its downward stroke and the air under pressure in the clearance space rapidly expands until the pressure falls below that on the opposite side of the inlet valve (Figures 2B and 2C) This difference...

Ngày tải lên: 20/06/2014, 17:20

... move freely in the guides and that seating surfaces contact evenly and tightly 7.4.2.2.4 Inspect and clean the protective screen at pressure and vacuum ports Remove bird and wasp nests 7.4.2.3 On ... identification banding or coding on tanks and piping according to MIL-STD-161, Identification Methods for Bulk Petroleum, and maintain and inspect according to paragraph 10.16 8.1.6 Vapor- and Explosion-Proof ... the bolts and gasket between flanges are not electrically insulated Static charges and prescribed grounding procedures are detailed in Chapter 8.1.2 Tools and Equipment Common repairs and maintenance...

Ngày tải lên: 20/06/2014, 17:20

... monitor; and organizational rescue team (standby rescue personnel), respectively 11.2 Standards 11.2.1 For all tank cleaning and related functions, follow the guidance in API Std 2015, Safe Entry and ... Operation and Maintenance: Cathodic Protection Systems, and AFI 32-1054 Close interval (soil-to-structure potential) piping surveys should be conducted initially within 30 days of installation and ... equipment and low-air warning devices until all workers exit the tank and remove their masks 11.6.6 Organizational Rescue Team This team includes the TES, attendant, and at least one standby rescue...

Ngày tải lên: 20/06/2014, 17:20

... clothing is on hand He or she inspects and approves equipment and clothing annually and before tank entry Reference AFOSH Std 91-31, Paragraph 2.12, and Chapter Required equipment and clothing includes ... Requirements are outlined in API standards and ASME Boiler and Pressure Vessel Code, Section IX At oversea locations, certification may follow host nation standards and or requirements 11.15.7 Obtain ... goggles during scraping and wire-brushing scale and spreading loose absorbent material If hands are frequently wet with fuel and it is not practical to wear protective gloves, the hands may be coated...

Ngày tải lên: 20/06/2014, 17:20

... Compressor systems and operations • Heat exchanger and cooling tower systems and operations • Steam generation and furnace systems and operations • Reactor systems and operations Key concepts and learning ... piping, tanks, and vessels • Pumps, compressors, and simple systems • Turbines and motors • Heat exchangers, cooling towers, and simple systems • Steam generation, fired heaters, and systems • Process ... and systems • Process symbols, diagrams, and instrumentation • Utility and separation systems • Reactor, distillation columns, and systems • Plastics systems Each chapter in the text moves from...

Ngày tải lên: 15/08/2013, 07:50

... underground salt domes, caverns, and other belowground storage systems Process technicians are required to safely operate and maintain each of the complex storage and transfer systems in a tank farm Figure ... senior technician to learn basic line-ups, standard operating procedures, safety rules and regulations, and sampling techniques Process tanks and storage systems are equipped with the latest in modern ... very pronounced between 950° and 1,000°F (510°C and 537.77°C) For example, at 950° and 1,000°F (510°C and 537.77°C), the strength of low-carbon steel is about one-third and one-sixth, respectively,...

Ngày tải lên: 16/08/2013, 15:29

... have a flexible pressure range and overall capacity, low power cost, and high efficiency rating They can handle density and gas composition changes, and small volumes and can deliver high pressures ... Shutdown, and Troubleshooting of Compressor Systems Tables 5.1 and 5.2 illustrate typical startup and shutdown procedures Tables 5.3 and 5.4 illustrate troubleshooting charts for identifying and solving ... Membranes are designed to be durable and tough and able to withstand high temperatures and a variety of conditions Diaphragm compressors can generate very high pressures and are used to compress hydrogen,...

Ngày tải lên: 19/08/2013, 10:47

... hold the baffles in place and prevent vibration and excessive tube movement Nozzles and Accessory Parts Shell -and- tube inlet and outlet nozzles are sized for pressure drop and velocity considerations ... shell and tube, reboiler, plate and frame, air cooled, and spiral The shell -and- tube heat exchanger is the most common in the process industry Shell -and- tube heat exchangers are designed to handle ... between them and how each applies to heat exchangers Which is (are) the most critical and why? Draw and label a hairpin heat exchanger Draw and label a shell -and- tube heat exchanger Draw and label...

Ngày tải lên: 20/08/2013, 10:39

... water and steam flow rates and temperatures and water level in the boiler The operator also checks for smoke and checks burner and flame pattern The operator maintains good housekeeping and unit ... the trap and comes into contact with the bellows Condensate causes the bellows to contract and open Steam causes the bellows to expand and close Bellows traps can handle condensate and noncondensable ... good housekeeping and unit logs and checks fuel pressure and temperature and oxygen level Finally, the operator monitors the pressure of 220 Steam Systems the firebox and drum; the temperatures in...

Ngày tải lên: 21/08/2013, 10:47

... material codes, and steam traps Pumps and Tanks Pumps and tanks come in a variety of designs and shapes Common pump and tank symbols are shown in Figure 12.11 Compressors, Steam Turbines, and Motors ... technicians and instrument and electrical, mechanical, safety, and engineering personnel In order to read a P&ID, the technician needs an understanding of the equipment, instrumentation, and technology ... distillation column, furnace, and boiler (Figure 12.1A) There are symbols to represent major and minor process lines and pneumatic, hydraulic, or electric lines, and there is a wide variety of...

Ngày tải lên: 23/08/2013, 14:30

... devices such 356 Reactor Systems as high-pressure relief valves and alarms, high-temperature alarms and emergency cooling, fire control systems, and toxic chemical detection systems are available ... drops, and impurities in the feed or product streams The type and quantity of instrumentation are usually determined by past data and experience and from research and development Reactor Systems ... systems, process variable alarms, and automatic shutdown controls Quench systems are designed to stop the reaction process Pressure relief systems are sized to handle and contain any release from...

Ngày tải lên: 23/08/2013, 14:47

... adhesives; hard and soft plastic; plastic fibers and fabric; and resistant, decorative, and transparent plastic Various methods are used in this process In extrusion, solid resins are melted and pushed ... adhesives; hard and soft plastic; plastic fibers and fabric; and resistant, decorative, and transparent plastic Various methods are used in this process In extrusion, solid resins are melted and pushed ... return head and is designed to expand (float) inside the shell as temperature rises Floating-roof tank—has an open top and a pan-like structure that floats on top of the liquid and moves up and down...

Ngày tải lên: 27/08/2013, 07:28

... http://www.tiaonline.org, or contact Andy Dryden at (703) 907-7633 Category Cabling: A Standards and Systems Overview Category Cabling: A Standards and Systems Overview Published by the Category Consortium Introduction ... category cabling systems — has assisted in development of generic standards primarily for balanced twisted-pair cabling systems These standards cover balanced twisted-pair cable and associated ... category 5, 5e and standards requirements Key features of the category standard Review of standards applicable to category Category market penetration TIA press release on category standard References...

Ngày tải lên: 10/12/2013, 02:15

... http://www.tiaonline.org, or contact Andy Dryden at (703) 907-7633 Category Cabling: A Standards and Systems Overview Category Cabling: A Standards and Systems Overview Published by the Category Consortium Introduction ... category cabling systems — has assisted in development of generic standards primarily for balanced twisted-pair cabling systems These standards cover balanced twisted-pair cable and associated ... category 5, 5e and standards requirements Key features of the category standard Review of standards applicable to category Category market penetration TIA press release on category standard References...

Ngày tải lên: 20/12/2013, 22:15

... Deterministic Signal (b) Random Signal 1.1.2.7 Right-Handed vs Left-Handed A right-handed signal and left-handed signal are those signals whose value is zero between a given variable and positive or negative ... discrete-time signals, like e-mail, is accomplished with analog signals and systems Understanding how discrete-time and analog signals and systems intertwine is perhaps the main goal of this course 21 ... 2.2.3 Linear Time-Invariant (LTI) Systems Certain systems are both linear and time-invariant, and are thus referred to as LTI systems Linear Time-Invariant Systems (a) (b) This is a combination...

Ngày tải lên: 22/12/2013, 12:16

... is some known function of integration x and the parameter α , a and b are constants independent of x and α , and the pardF tial derivative ∂f ⁄ ∂α exists and it is continuous, then = dα 2-6 ... 2e – 2t – 20 δ ( t – ) Signals and Systems with MATLAB Applications, Second Edition Orchard Publications 1-23 Chapter Elementary Signals NOTES 1-24 Signals and Systems with MATLAB Applications, ... } = s ⎧ L ⎨ ⎩ t ⎫ ∫0 f ( τ ) dτ ⎬ = ⎭ F(s) -s (2.26) and the proof of (2.23) follows from (2.25) and (2.26) Signals and Systems with MATLAB Applications, Second Edition Orchard Publications...

Ngày tải lên: 19/01/2014, 18:20