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Distribution tube system

A recent development of the insulated runner principle is the distribution tube system. This overcomes the possibility of freezing-off by insertion of heated tubes into the runners. However, this system still relies on a thick layer of polymer forming an insulation layer on the wall of the runner and so this system is not suitable for heat sensitive materials. [Pg.292]

Note that both the insulated runner and the distribution tube systems rely on a cartridge heater in the gate area to prevent premature freezing off at the gate (see Fig. 4.40). [Pg.292]

At its simplest, a HW heating cycle is the circulation of HW from a boiler (or heat pump or similar device) through a supply and distribution piping system to various appliances and then back to the boiler. Hot water systems are hydronic systems and, when of any size, are designed to operate via various primary and secondary circuits. These circuits are provided with their own circulating pumps of different capacities to provide proper layout flow, usually to perimeter-wall m-tube convectors, fan coil units, or other space heating equipment. [Pg.132]

B 345 Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded Tube for Gas and Oil Transmission and Distribution Piping Systems B 361 Factory-Made Wrought Aluminum and Aluminum-Alloy Welding Fittings... [Pg.27]

Based on this equation one can predict the temperature increase to be expected for a defined annulus thickness as shown in Fig. 3. With the above-described approach one can in addition construct a monolithic annulus of a desired radius but limited thickness. By preparing a series of annuluses where the outer diameter of the smaller monolith is equal to the inner diameter of a larger one, a large volume monolithic unit can be constructed by forming a so called tube in a tube system, as shown in Fig. 4. In this way, a monolithic unit of the required volume and uniform pore size distribution can be prepared. Furthermore, the voids between the annuluses can be filled with the reaction mixture and polymerization is allowed to proceed for a second time. Since the voids are very thin, no increase in temperature during the course of the reaction is expected. [Pg.69]

Connect the cold-water supply line with a solenoid valve to the distribution tube. Make sure the float system used to control the water level in the tank is operating freely and connected to the solenoid valve. Check if the solenoid valve is connected to an electrical supply. Turn on the water supply. Observe the water level. It should be slightly below the overflow if it is not, adjust the level float system. A water flow rate of 2 gpm should be sufficient and should register satisfactorily on a in. meter. [Pg.309]

In the cooling-tube system, one catalytic screen only was used, hence, all the air that was to be introduced had to be given to the reaction at one time. With more than one catalytic screen, the air is introduced in portions before entering each screen, being distributed among the screens usually in equal amounts. The triple-screen system also makes possible the use of different catalysts. It has been found that uranium oxide catalyzes the oxidation to the aldehyde stage, and at present uranium oxide is used for screen 1 and the molybdenum oxide mixture for screens 2 and 3. An example of the experimental result is shown -Ba... [Pg.253]

This is the equation of state that models the behavior of liquid s temperature (state variable) along the length of the exchanger. Since eq. (4.19) is a partial differential equation we say that the exchanger has been modeled as a distributed parameter system. Note that U is the overall heat transfer coefficient between steam and the liquid in the tube, and Ta is the temperature of saturated steam. [Pg.45]

In the case of fixed bed (deep bed granular filters) flocculators the power is dissipated as laminar flow through granular media, with local velocity gradients in the pores formed by quasi-parabolic velocity distributions. The system is analogous to small-bore tubes (section 4.9.2) bearing in mind the capillary model concept of the Kozeny-Carman equation 4.68 for head loss through a fixed bed,... [Pg.153]

An approximate equilibrium is set up in the plasma, with the electrons, ions, and atoms having velocity distributions similar to those of a gas that has been heated to temperatures of 7,000 to 10,000°C. Since the plasma is ignited toward the end of the concentric tubes from which argon gas is issuing, the plasma appears as a pale-blue-to-lilac flame coming out of the end of the tube, which is why the system is referred to as a torch, as in a welding torch. [Pg.395]

In most cases, the activator impurity must be incorporated during crystal growth. An appropriate amount of impurity element is dissolved in the molten Ge and, as crystal growth proceeds, enters the crystal at a concentration that depends on the magnitude of the distribution coefficient. For volatile impurities, eg, Zn, Cd, and Hg, special precautions must be taken to maintain a constant impurity concentration in the melt. Growth occurs either in a sealed tube to prevent escape of the impurity vapor or in a flow system in which loss caused by vaporization from the melt is replenished from an upstream reservoir. [Pg.435]


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See also in sourсe #XX -- [ Pg.292 ]

See also in sourсe #XX -- [ Pg.292 ]




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