Nozzle Locations

Exhibit 5-14 depicts the preferred nozzle locations for horizontal drums. 

The preferred location for level instruments is away from the turbulence at the liquid outlet nozzle. Although the vessel is provided with a vortex breaker, instruments should be set in the quiet zone of the vessel for example, on the opposite side of the weir or baffle or near the vapor outlet end. Process nozzles should be located a minimum from the tangent line. Steam-out conneaions should be located at the end opposite the maintenance access and vent in the bot- 

ETOilBlT 5-14 Preferred Nozzle Locations for a Horizontal Drum 

To facilitate specific elevation requirements for level instruments or positioning a maintenance access, nozzles may be located off the main axis. These nozzles are generally referred to as hillside nozzles. A typical hillside nozzle is shown in Exhibit 5-15- Tall vertical drum nozzles should be elevated and oriented using the tower subjea as a guide. It should be noted, however, that nozzle locations are not restricted by internal components, as is die case for the distillation tower. More information on vertical drums is available in Chapter 10, Towers. 

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Figure 7 shows nozzle locations and support arrangements for a typical horizontal vessel (7). The saddles used for support are sustained by concrete pedestals or steel stmctures. Sufficient clearance between the bottom nozzles and the support saddles needs to be provided for access to the nozzle flange bolts. The manway can be located on the end head of the vessel, the topside of the vessel, or the side of the vessel. The preference is for an end manway wherever possible for accessibiHty, except when it is limited by the level gauges and controls that are commonly mounted off the heads. 

Some manufacturers are using relatively low-pressure air (100 kPa, or 15 Ibfiin", instead of 690 kPa, or 100 Ibf/in") and are eliminating the venturi tubes for clean-gas induction. Others have eliminated the separate jet nozzles located at the individual bags and use a single jet to inject a pulse into the outlet-gas plenum. 

The roof surface, from nozzles located at a suitable height... 

The first stage of the cycle is the flow of molten polymer into the mould cavity through a standard feed system. Before this flow of polymer is complete, the injection of a predetermined quantity of gas into the melt begins through a special nozzle located within the cavity or feed system as shown in Fig. 4.45. The timing, pressure and speed of the gas injection is critical. 

The characteristic feature of the main stream and horizontal directing jet interaction is that the directing jets are supplied through nozzles located at some distance from each other and from the outlet supplying the main stream (Fig. 7.55). 

It must be pointed out that a Code stamp does not necessarily mean that the vessel is fabricated in accordance with critical nozzle dimensions or internal devices as required by the process. The Code inspector is only interested in those aspects that relate to the pressure-handling integrity of the vessel. The owner must do his own inspection to assure that nozzle locations are within tolerance, vessel internals are installed as designed, coatings are applied properly, etc. 

The feed should be introduced into zones of the highest turbulence, i.e. near the tip of the stirrer at the plane of the agitator or slightly above this plane the velocity of injected reactants should prevent backmixing of the reaction mixture into the feed pipe if the addition time will be too long, consider a multi-injection system with nozzles located at different angular positions. 

The precise location of the feed point will affect the number of stages required for a specified separation and the subsequent operation of the column. As a general rule, the feed should enter the column at the point that gives the best match between the feed composition (vapour and liquid if two phases) and the vapour and liquid streams in the column. In practice, it is wise to provide two or three feed-point nozzles located round the predicted feed point to allow for uncertainties in the design calculations and data, and possible changes in the feed composition after start-up. 

Thus, the technique can become counterproductive. A typical arrangement for selective non-catalytic reduction is shown in Figure 25.30. Aqueous ammonia is vaporized and mixed with a carrier gas (low-pressure steam or compressed air) and injected into nozzles located in the combustion device for optimum temperature and residence time10. NO, reduction of up to 75% can be achieved. However, slippage of excess ammonia must be controlled carefully. 

Each Glatt unit is equipped with a binder solution pirrp that supplies the liquid binder at a controllable rate to the atcmizing nozzle located in the mixing chanter. 

Manual firefighting capability should be provided by monitor nozzles located within 50 ft (15.2 m) and hose stations within 100 ft (30 m) of the com-pressor(s). Hose stations are particularly important for compressors located in a building or enclosure. 

Thorough visual inspection of the system including piping and piping supports, nozzle locations, placement of signs, and openings that would... 

A proprietary F nozzle, located at the exit of the filtering module and spraying countercurrent to gas flow, provides the mechanism for the collection of the fine... 

Lfg m Effective length of vessel where separation occurs, ft (To allow for inlet turbulence and outlet nozzle location, effective length can be approximated as at 0.75 timet the seam-to-team length, LM)... 

In the RCC process (Figure 8-13), the clean regenerated catalyst enters the bottom of the reactor riser where it contacts low-boiling hydrocarbon lift gas which accelerates the catalyst up the riser prior to feed injection (Hydrocarbon Processing, 1996). At the top of the lift gas zone the feed is injected through a series of nozzles located around the circumference of the reactor riser. 

Spray boom and nozzle locations, type of nozzle... 

The formation of cake around nozzle tip can significantly change the spray droplet size and spray pattern, which can lead to the formation of large agglomerates. In addition to considering proper nozzle location, spray properties, and reducing... 

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