Modular assembly elements

Externally Wound Tubular Membrane Elements in Modular Assemblies Production and Application... 

A modular assembly housing externally wound tubular membrane elements may be defined as a pressure vessel within which are assembled a multiplicity of individual elements, means for connecting and sealing said elements to common headers and a feed stock distribution system that provides for adequate feed flow across membrane surfaces. 

In the development and design of modular assemblies housing a multiplicity of externally wound tubular membrane elements, the following factors were considered effectiveness of element packing arrangements and density, feed stock distribution patterns for controlled and uniform feed flow across membrane surfaces, sealing reliability of modular sub-assemblies, overall system reliability, module serviceability and ease of maintenance, system productibil-ity, and economic viability. 

In utilization of externally wound tubular membrane elements in modular assemblies for conventional systems operations, that is, selective separation via the circulation of pressurized feed across membrane surfaces, flow guide tubes were found to be essential for the proper distribution and control of feed flow. This was achieved singularly by the use of individual element shrouds or flow tubes creating an annular gap through which feed stock was circulated across membrane surfaces. 

A representative multi-element modular assembly is depicted in Fig. 2. In this design the module comprises three major components ... 

R.O. systems utilizing externally wound tubular membrane element in modular assemblies have been used in the desalination of brackish and sea waters, the treatment and/or concentration of industrial waste waters, the separation/concentration of fluid food, pharmaceuticals and chemical solutions, and the manufacture of water purifiers for domestic use. Generally, externally wound tubular membrane systems have been found to be highly suitable for ultrafiltration applications in the processing Industry and in water pollution control applications. 

Modular assembly of expression constructs including promoters, ORFs, epitope and purification tags, can now be achieved in HTP, without the use of restriction enzymes and ligase. Once a set of entry vectors has been created, the elements can be mixed and matched in an LR reaction. Elements in a multi-fragment constract can be selectively removed via a specific BP recombination reaction, thereby creating an intermediate destination vector. For example, an enzymatic pathway can be assembled using modular promoters and ORFs to create a synthetic operon. Once the wild-type activity is established, a library of mutants can easily replace specific... 

Figure 5.13 shows a schematic representation of the modular screw-element sequences, barrel sections, and overall assembly of an intermeshing co-rotating twin-screw extruder. 

Elements of a factory-assembled tower are basically the same as field-erected towers. The main difference is that in factory-assembled units, the design is modular in concept, with units shipped as modules and arranged on site. Figure 4.17 shows a typical installation. Manufacturers offer considerable flexibility to permit best use of available space for their equipment. 

ORFs in the pathway, without affecting the surrounding elements. In addition, multi-domain proteins (e.g., membrane receptors) can be assembled using a modular approach [27]. Using the Gateway recombination technology, this can be completed within a matter of days. 

The great advantage of TSE s stems from the modular design of barrel and screws. The manu-facmrers provide a diversity of the barrel elements (usually their length, L = 4D, sometimes 3D), that can be assembled in the configuration required for specific applications, viz. ... 

Historically, the fundamental disposition of core business processes is to prepackage and shrinkwrap as much product as possible, take advantage of economies of scale, and then persuasively offer these products. Service is viewed as a way of enhancing the attractiveness of products. The New Economy enterprise, on the other hand, wiU design core processes that concentrate on assembling modular elements into a customized response to a specific customer s specific request. 

To decommission the old service headframe a systematic plan to safely remove the structure was developed. The first course of action was to derope and remove of all equipment from the headframe. Next was the removal of the structural penthouse and to assist with this plan, a finite element analysis model of the existing service headframe was developed and updated as the members were removed to ensure structural integrity was maintained. This approach was executed until the entire structure was removed. Now that the headframe was removed, the new modular headframe was ready for assembly. 

The filtration membranes are sensitive to fouling as well as to free chlorine. This situation is least troublesome in a membrane-cell plant, where the problem components already have been removed from the brine. In mercury-cell plant applications, an installation in the brine recycle loop should include some means of dechlorination. The usual choice is treatment with activated carbon, which is covered in Section 7.5.9.3B. The membranes are in spiral-wound modules placed in cylindrical housings and assembled as on the skid shown in Fig. 7.81. Figure 7.82 shows the construction of a modular element. The low-sulfate permeate flows through the membranes into spacer channels... 

---