Production • Processing • Handling
Tey also expand less than rubber, which allows the components to handle higher temperatures and enables better performance. Te full metal version runs without surface contact between lobes and housing or between the lobes – there are defined gaps. With the rubber- metal version, only soft surfaces are running on hard ones, so the pumps run quietly and hardly generate any vibration, noise or friction heat. Te rotating components are therefore preserved and will last longer. Furthermore, expensive oil changes are a thing of the past, because the synchronisation works completely without oil. Te pump’s direction of conveyance can easily be
reversed, so that the same system can, for instance, be used both for filling and emptying. Te possible conveyance rates over the various sizes range from
Fig. 3. The whole structure of the rotary lobe pump is designed for resilience and easy maintenance. The image shows the all-metal version.
3m³/h to over 900m³/h. Te system can also be installed in any orientation and it has a space-saving design due to the motor being attached directly above the pump chamber. Tis aspect was essential for application in the Ex Zone 1 of a preparation unit with a very narrow design into which the pump was directly integrated. Tere, the conveying system ensures the inflow of the pumped oil-sand mixture, with a kinematic viscosity of 30 to 35mm²/s and a temperature of 60°C, into a separator where the remaining sand and water are separated. l
For more information ✔ at
www.engineerlive.com/iog
Erwin Weber is head of the Tornado product line at Netzsch in Germany.
www.netzsch.com
China oil demand fell 0.7% in May C
hina’s apparent oil demand in May 2014 dipped 0.7% compared with the same month last
year to 39.92 million metric tons (mt) or an average 9.44 million barrels per day (b/d), a recently released Platts analysis of Chinese government data showed. Apparent oil demand in May was at its lowest
level in nine months – recording the first year-on- year contraction since January – following three months of relatively slow growth. On a month-over-month basis, apparent oil demand in May fell 3.2% from April, reflecting China’s underlying damped economic performance. This was the third consecutive year that apparent oil demand contracted in May from April. This was counter to prior years, when apparent
oil demand traditionally accelerated in the second quarter compared with March due to a pick-up in industrial activity in spring. China’s refinery crude oil throughput
volumes in May rose 3.5% from a year earlier to a four-month low of 9.54 million b/d, according
to the latest data from China’s National Bureau of Statistics. Net crude imports for May were up 9.4%
from the same period a year ago to 6.17 million b/d. However, China became a net exporter of oil products in May, with exports outpacing imports by 410,000 mt. This compared with net oil product imports of 1.25 million mt in May 2013. China has significantly reduced its imports
of jet/kerosene and fuel oil in 2014 due to a combination of sluggish demand and increased domestic output. Exports have remained steady. China was a net oil products exporter in March, the first time since January 2010, but returned to being a net importer in April. In the first five months of 2014, China’s
apparent oil demand was essentially flat, rising just 0.2% from 2013 to 9.85 million b/d. In China’s individual oil products markets,
gasoil apparent demand in May flipped to negative growth, contracting by 1.6% year over year to
3.33 million b/d. Domestic production dipped 0.7% year over year to 14.15 million mt. Net exports surged 66.7% from a year earlier to 300,000 mt. Gasoil demand in China has slowed as the nation’s economic growth has slowed. Gasoline apparent demand increased 10.3%
in May from a year earlier to 2.36 million b/d, on strong transport sector consumption. Domestic refiners’ gasoline output increased 7.9% on a year- over-year basis to 8.86 million mt. Fuel oil apparent demand plummeted 33.6%
to 512,000 b/d on the back of a 73.5% slump in net imports to 400,000 mt. Domestic production of fuel oil in May was down 6.9% to 2.1 million mt. Consumption of imported fuel oil –used
significantly as a raw material for the manufacturing of refined petroleum products by small, independent refiners known as ‘teapot’ refineries – has taken a hit the past two years as refiners have gained greater access to domestic crude oil, which is an alternate feedstock. l
www.engineerlive.com 83
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