DESIGN-EASE

The second cutwater and volute channel create an additional obstruction to the flow through this pump, and for that reason it robs some energy from the fluid. This will reduce the efficiency to a small degree, but the operational range of these pumps is quite broad as you can see in the graph. The dual volute design easing is an optional cost accessory with some pump companies, and offered standard with others. 

Further insight into the statistieal strength properties of some eommonly used metals is provided by a data sheet in Table 4.6. Again eaution should be exereised in their use, but referenee will be made to some of these values in the probabilistie design ease studies at the end of this seetion. 

Tubular (side combustors). These designs are found on large industrial turbines, espeeially European designs, and some small vehieular gas turbines. They offer the advantages of simplieity of design, ease of maintenanee, and long-life due to low heat release rates. These eombustors may be of the... 

Design Ease and Design Expert, Stat-Ease Inc., Minneapolis, USA, http //www.statease.com/ (Accessed on January 31, 2008). 

Vehicles and equipment Roadworthiness Lighting Braking Occupant restraints Other safety devices Crash protective design Ease of access Fire risk Automatic crash notification... 

Product design (ease of disassembly) Economy-oriented Product... 

Although simplicity should always be one of the main concerns in any development process, it is of special importance for safety critical systems. Indeed, a simple design eases the understanding of the overall system, the writing of detailed specifications and hence the potentially expensive and time consuming certification or qualification processes. 

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