Fixed deck

The Genesis Station from Tecan The Genesis Station from Tecan (Fig. 14.3) consists of a fixed deck supporting crystallization plates and deepwell-blocks overhung by an arm capable of... 

For fixed offshore platform units, the design method should follow the strength level analysis guidelines in API RP 2A. The drilling and well servicing units should be able to resist the deck movement, i.e., the response of the deck... 

Fixed fire protection for specific equipment or vessels should be provided to the top of the vessel or for tall vertical vessels, to the greater height of either 10 ft (3 m) above the normal flammable liquid levels in the vessel or to a height of 30-40 ft (9-12 m) above any level, either grade level or a solid floor deck, where a substantial pool fire could develop. 

Covered floating roof tank—an atmospheric storage tank with a fixed roof and steel internal floating roof of the single-deck pontoon or double-deck design. 

Fixed-Roof Tanks. The effect of internal pressure on plate structures, including tanks and pressure vessels, is important to tank design. If a flat plate is subjected to pressure on one side, it must be made quite thick to resist bending or deformation. A shallow cone-roof deck on a tank approximates a flat surface and is typically built of 3/ 16-in. (4.76-mm) thick steel (Fig. 4a). This is unable to withstand more than a few inches of water column pressure. The larger the tank, the more severe the effect of pressure on the structure. As pressure increases, the practicality of fabrication practice and costs force the tank builder to use shapes more suitable for internal pressure. The cylinder is an economic and easily fabricated shape for pressure containment. Indeed, almost all large tanks are cylindrical. The problem, however, is that the ends must be closed. The relatively flat roofs and bottoms or closures of tanks do not lend themselves to much internal pressure. As internal pressure increases, tank builders use roof domes or spheres. The spherical tank is the most economic shape for internal pressure storage in terms of required thickness, but it is generally more difficult to fabricate than a dome- or umbrella-roof tank because of its compound curvature. 

Note that Ga is the air mass-velocity in lb dry air/(hr) and 0 is a function of the type of packing and number of packing deck levels. This, in turn, fixes... 

Not all trays are fouling-resistant. Floats on moving valve trays tend to stick to deposits on the tray deck. Fouling-resistant trays have large sieve holes or large fixed valves, and these should be used when plugging and fouling are the primary considerations. 

The design must include fixed anchorage only at a suitable midpoint and the deck should be able to slide latterally over the other supports as it stretches. Expansion joints, if used, must be carefully located to prevent humping or flexing. 

If possible, stay on deck and keep eyes fixed on the horizon. 

The mass-transfer devices may be sieves (holes), fixed valves, moveable valves, or bubble caps. Fig. 2 shows a selection of mass-transfer devices. The purpose of the device is intimate mixing of the vapor and liquid on the tray deck. An ideal device has high capacity, high flexibility, low leakage, low pressure drop, and low cost. 

Generally, WPC deck boards are more slippery than the wood boards. It is easy to verify using a simple experimental setup. Take a 4-ft. conditioned (not wet) board, fix it at a certain angle, place onto the board a leather-sole shoe with a chunk of a heavy metal in it (to increase the weight of the shoe for its stability on the board), and slowly (or step-wise) incline the board until the shoe starts to slide down. With a wood board (such as pressure-treated lumber), it will happen at an angle of about... 

Installation of the circulatory ventilator Circulatory ventilator is fixed on the circulatory duct s shelf. Place one circulatory ventilator on the lower deck and two on the upper deck. The interval distance is 0.2 m among the ventilators and ventilator on the lower deck is 0.3 m away from the lane s floor. There is a silencer on both the exit and entrance of the ventilators. Air regulator is set at the entrance of the ventilator. A sealed cover is placed at the entrance of the alternate ventilator... 

---