Slow speed engines

Tn addition, a wide variety of military equipment, including tanks, armored personnel carriers, HUMVEEs and ships, is powered by diesel engines. The governed speed of diesel engines can range from as low as 85 rpm in large-displacement, slow-speed models, to as high as 5,500—6,000 rpm in smaller automotive type models. 

Arctic grade diesel fuel oil is recommended for use in environments with ambient temperatures lower than -25.6°F (-32°C). It is intended for use in high-speed automotive-type diesel engines, pot-type burner space heaters, and nonaircraft turbine engines. It is not intended for use in slow-speed stationary engine applications. 

Fuels used in marine applications are quite diverse in their properties. Low-viscosity distillate fuels and high-viscosity residual fuels can both be considered marine fuels. The applications, though, would differ and could include use in direct injected diesel engines, boilers, and gas turbines. Also, high-speed, medium-speed, and slow-speed engines can be found in marine applications. 

Marine residual fuels bunker fuel oil Grades ISO RMA through RML marine residual fuel and bunker fuel are blended from components such as atmospheric resid, vacuum resid, visbreaker resid, FCC bottoms, low-grade distillate, and cracked components. Bunker fuel has a maximum viscosity of 550 cSt 122°F (50°C), density of 0.990 g/cc, and sediment of 0.1 wt%. ISO marine fuel oil viscosities range from 10 to 55 cSt 212°F (100°C). These fuels are used in slow-speed diesel engines and boilers. 

In fact, business reading requires that you have different speeds, that you tune your reading to the task at hand. Unfortunately, years of engineering schoolwork have taught many engineers to read at a methodical and often fairly slow speed, to absorb, for instance, aU the material in some fluids or electromagnetics text. In business, this approach is wasteful, and just recognizing that different materials deserve different levels of attention can help. 

Reciprocating piston, plunger slow speeds driven by steam engine cylinders or motors through crankcases... 

Diesel engines are classified by their rpm, as shown in Table 13.1. The majority of marine propulsion engines are slow-speed, two-stroke engines and the remainder are mainly medium-speed engines. The principal characteristics of the two engine types are outlined in the following sections. 

Fig. 13.2 MAN B W type 6L 90MC slow-speed engine in the builder s shop. Cylinder bore 900 mm, stroke 2916 mm, output 23,460 kW at 78 rpm. Courtesy of MAN B W Diesel AjS, Copenhagen, Denmark...

Economic - Simultaneous engineering minimizes time to market - High potential for reduction of development costs - High processing costs (equipmenL supplies) - Small order quantity and slow speed of fabrication of part... 

High cylinder oil consumption and slow speed running of main engine [1]... 

From the perspective of the design engineer, the most important aspect of pedestrian behavior is the street crossing speed. As people age their walking speed decreases and they need more time to cross the road. Unlike car drivers, whose speed is directly related to the likelihood and severity of a crash, in the case of pedestrians, their slow speed only increases their exposure to injury. It is therefore important to know at what speeds people cross streets, and what variables affect these speeds. 

Everything about the skipper s decisions, (a) to abort the trip, (b) to test run his main engine for a 45minute period on low revs, (c) to return to base at slow speed, suggest responsible behavior by a cautious and prudent man. 

Hinton was one of the chief proponents of the fast reactor. It is noticeable that in a 1950s film produced by the AEA promoting Calder Hall, there is a short piece near the end when Hinton talks to the camera. He dismisses Calder Hall (the subject of the film ) as being like an old slow speed reciprocating steam engine compared with a fast reactor which he likens to a modern gas turbine. 

---