Bundle removal

With an even number of tube-side passes the floating-head cover serves as return cover for the tube-side fluid. With an odd number of passes a nozzle pipe must extend from the floating-head cover through the shell cover. Provision for both differential expansion and tube-bundle removal must be made. 

The hairpin heat exchanger, unhke the removable bundle TEMA styles, is designed for bundle insertion and removal from the return end rather than the tubesheet end. This is accomplished by means of removable spht rings which shde into grooves machined around the outside of each tubesheet and lock the tubesheets to the external closure flanges. This provides a distinct advantage in maintenance since bundle removal... 

Kettle 10-lF Tube bundle removable as Boiling fluid on shell side, as For horizontal installation. 1.2-1.4... 

Exchangers with an internal floating head. Figures 12.5 and 12.6, are more versatile than fixed head and U-tube exchangers. They are suitable for high-temperature differentials and, as the tubes can be rodded from end to end and the bundle removed, are easier to... 

Bundle removal space must be allowed for shell-and-tube exchangers. 

Road access is essential for exchanger bundle removal, for tower tray removal, to pumps, for catalyst loading and removal, for crane access to compressors, etc. It is advisable to study the piping layout from this standpoint. Remember that roads... 

Figure 7-70. This plan view shows provision for tube bundle removal with minimum removal of piping.

Whether the planned plant is an inline arrangement or housed in a struaure, the plant layout designer must make provisions for operator and maintenance access. The designer must review the items of equipment that are included in the process and plan for their operation and maintenance requirements. For example, towers must be located in a position to allow for the removal of internals, reactors require space for catalyst loading and unloading, shell and tube exchangers require space for bundle removal, and rotat-... 

Compressors and their related equipment are usually located in one area for conunon operation and servicing adjacent to the main pipe radk and the auxiliary road. The suaion drum for the machine should be positioned for flexibility in the piping and to accommodate orifice run requirements. If the compressor is driven by a condensing turbine, a surface condenser and condensate pumps are required. If servicing one machine, the condenser may be located beneath the turbine. If it services two or more, the condenser must be located ac acent to the machines it services. In both cases, space must be provided for condaaser tube bundle removal. 

EXHIBIT 6-51 Bundle Removal Using an Extractor and a Mobile Crane... 

Exhibit 6-51 illustrates an elevated exchanger with the extractor and crane in position for bundle removal. Exhibit 6-52 provides details of a hydraulic tube bundle extraapr. 

Exchanger bundle removal load This is half the weight of the tube bundle. 

The two columns and the 3 reactors should all be aligned with suitable spacing and all the exchangers should have clearance for tube bundle removal. 

Spacing should be sufficient to permit safe bUnding and tube bundle removal without damage to or removal of adjacent piping or valves. 

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