Rotary car dumper


Rotary car dumper

A rotary car dumper or wagon tippler (UK) is a mechanism used for unloading certain railroad cars such as hopper cars, gondolas or lorries (tipplers, UK). It holds the car to a section of track and rotates the track and car together to dump out the contents. Used with gondola cars, it is making open hopper cars obsolete. Because hopper cars require sloped chutes in order to direct the contents to the bottom dump doors (hatches) for unloading, gondola cars have a greater volume.

Overview

Originally, individual cars would be decoupled and placed in the dumper, but now it is possible to dump an entire unit train of coal without uncoupling any of the cars. The cars used for these trains are equipped with rotary shaft tightlock couplings (AAR Type F) on one end. The end with the rotary coupler is marked with a colored stripe, typically white, red or yellow. The dumper rotates the cars on the axis of the couplers.

Rotary dumping of cars provides a number of advantages. Firstly, rotary dumping eliminates the wasted volume under the sloping bottoms of a traditional hopper car. Secondly, a unit train of coal (100 cars) can be unloaded in approximately two and a half hours using a rotary dumper. Bottom dump cars require much longer to unload, partly because the area for the coal to flow out is less than one quarter of the footprint of the car and partly because the coal handling equipment is normally sized for the lower possible rate. Another advantage of rotary dumping is that loads that have gotten wet and/or frozen can still be unloaded quickly. A frozen load of coal in a "bottom dump" car has to be thawed out to be emptied. Since railroads charge demurrage for not unloading cars quickly, a frozen load represents an unwanted expense. However, most methods to thaw the car quickly in freezing weather present safety hazards including setting the coal on fire. The reduced labor, demurrage, and risks from thawing frozen loads offset the higher equipment cost of a rotary dumper at somewhere around a unit train per week.

Sometimes rotary dump cars are coupled in fixed pairs so that they are unloaded two cars at a time.

Alternatives

Alternatives to the rotary dump cars are bottom dump cars with bottom doors, and back end hoes which unload gondola cars. The former has the disadvantage that any imperfection in the seals of the doors allows material to spill onto the track.

See also

* Pilbara railways in Western Australia for iron ore. Mostly two cars at a time.
* Automatic coupling
* Bulk material handling
* Bulk cargo
* Heyl & Patterson, Inc.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Dumper (disambiguation) — A dumper is an off road vehicle designed for carrying bulk material. Dumper may also refer to: Anthony Charles Dumper (born 1923), Bishop of Dudley Dumper (computer program), a computer program that copies data from one source to another Dumper… …   Wikipedia

  • Hopper car — Two bay hopper cars of the Reading Railroad. New hopper cars outside the …   Wikipedia

  • Railroad car — A railroad car or railway carriage is a vehicle on a rail transport system (railroad or railway) that is used for the carrying of cargo or passengers. Cars can be coupled together into a train and hauled by one or more locomotive. Passenger cars… …   Wikipedia

  • Bulk cargo — A mini bulker taking on cargo in Brest. Bulk cargo is commodity cargo that is transported unpackaged in large quantities. This cargo is usually dropped or poured, with a spout or shovel bucket, as a liquid or as a mass of relatively small solids… …   Wikipedia

  • Freight train — or goods train is a series of freight cars hauled by a locomotive on a railway, ultimately transporting cargo between two points as part of the logistics chain. Trains may haul bulk, containers or specialized cars. Under the right circumstances,… …   Wikipedia

  • Xcel Energy — Inc. Type Public (NYSE: XEL) Industry Electricity and Natural Gas Utility …   Wikipedia

  • Bulk material handling — is an engineering field that is centred around the design of equipment used for the transportation of materials such as ores and cereals in loose bulk form. It can also relate to the handling of mixed wastes. Bulk material handling systems are… …   Wikipedia

  • поворотный вагоноопрокидыватель угля — — [А.С.Гольдберг. Англо русский энергетический словарь. 2006 г.] Тематики энергетика в целом EN coal rotary car dumper …   Справочник технического переводчика

  • Heyl & Patterson Inc. — Heyl Patterson Inc. is an American specialist engineering company, founded in 1887 and based in Pittsburgh, Pennslyvania.History Heyl Patterson was founded by Edmund Heyl and William Patterson cite web title = A Standard Reference publisher = url …   Wikipedia

  • Fossil fuel power plant — A fossil fuel power plant burns fossil fuels such as coal, natural gas or petroleum (oil) to produce electricity.Fossil fuel power plants are designed on a large scale for continuous operation. In many countries, such plants provide most of the… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.