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6100 lbf load on 3 ton hoist

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someguy79

someguy79

Mechanical
Apr 5, 2007
133
I got a request from a fellow engineer at the plant asking about doing a planned engineered lift per ASME B30.2. The hoist they want to use is rated for 3 tons (i.e. 6000 lbf), and the item they want to pick is 6100 lb.

ASME B30.2 3.2.1.1(a) says “Planned engineered lifts shall be limited to powered cranes having a load rating of 5 tons and above.” I’m not yet sure how that difference will affect us. To me this seems like the proposed lift is outside the scope of ASME B30.2 and perhaps not allowed.

Is there another reference out there that would cover this subject more thoroughly? (e.g. OSHA section? CFR 1910.XX?)

BTW, I am planning to ask the manufacturer for guidance. They're usually quite interested in this sort of thing. Also, standards are nice, but the local authority having jurisdiction will govern.
 
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their gallon is different too ... seriously, really, anyone, why 3.8lt/US gallon ?

another day in paradise, or is paradise one day closer ?
 
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Why does the UK have a gallon measure at all? WTF does it correlate with? There must be some arcane historical reason, but I don't get it.

I'm not saying it's better than the metric system, but in the US, 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces.

Too bad this US customary system (some times referred to as Imperial) doesn't relate the length units to the volume units very well. For instance 1 cubic foot is approximately 7.481 gallons.

Also too bad, the time units we all use are terrible. There isn't a common base number (e.g. 10 in the metric system) and some of the units aren't standard. The year varies by a day sometimes, and even if adjusted for leap year, it has to be adjusted by a second or so once in a while. Can't we have a day divided into some base ten unit? That would be nice.

<p> end rant </p>
 
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An Imperial Gallon of fresh(ish) tepid(ish) water weighs 10(ish) Lb.

In practice, we don't really use gallons for very much at all any more. When petrol was merely ruinously expensive, we used to complain about its price per gallon - but now that it's well over a quid per litre, we can complain equally effectively in metric.

Fuel consumption is still popularly described in miles per (imperial) gallon. I think that may be about all that's left now.

A.
 
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someguy79 - Are you serious? - We invented it that's why.

The problem is that the US gallon was one of three "gallons" used when the colonisation of the continental US was being undertaken with the "Queen Anne" or "wine Gallon" being used more frequently which was established as exactly 231 cubic inches and becale the US gallon on independence.

The UK and its empire (at that time) established the current single Imperial Gallon in 1824, which is the current UK or imperial gallon.

Whilst the US gallon and the UK gallon both have 4 quarts = 8 pints, at that point it differs becoming 20 fl oz (imp) and 16 fluid oz (US). Unfortunatley it isn't a 5/4 conversion as the fluid ounce is different (!!), but the difference between a 6/5 fraction is negligible for most purposes - see below.

Hence from BS 350 - I imperial gallon = 4.54609 litres, a US gallon = 3.78541 litres and hence 1 imperial to a US gallon is 1.20095 or 0.832674 US to a UK.

The price of gasoline is still lots lower though in the US - basically 30p a litre compared to £1.10...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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LittleInch,

Thanks for the laying out the arcane historical reasons for the differences. I've long suspected that it has to do with changes in the unit of measure associated with one ruler or other. It actually is interesting.

Oddly, I've never seen the 231 cu-in /gal conversion before. It's helpful.
 
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@someguy,

"but in the US, 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces" ...
the same in the UK, only different gallons, quarts, pints, fl. ozs, ...

another day in paradise, or is paradise one day closer ?
 
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"Fuel consumption is still popularly described in miles per (imperial) gallon. I think that may be about all that's left now." ... the metric equivalent is lts/100km ... more sensible as a measure of consumption, but an awful unit!


another day in paradise, or is paradise one day closer ?
 
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The problem with l/100km is that it is the inverse of what everyone has become used to so a high figure (good) in l/100km feels "bad".

I've been trying to promote miles per litre without much success. We all know what miles mean, we buy the stuff in litres so know the cost. Not many understand that 35 mp(UK)g equals 15p per mile as this would be 7.7 mpl at 1.20/litre.

Beer has a permanent dispensation from being metrified in the UK at least, and Ireland I think, but gallons can only be used as a "secondary" unit since 1995, i.e. anything can be sold in 4.54 litre ( 1gallon) containers. Most gave up some time ago and use nominal litre sizes (5 isn't far away...)

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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If you want to talk odd units and vehicles, go about measuring emissions as grams/horsepower/hour. That's actually a pretty common unit here. At least it's common among those who keep track of emissions from vehicle engines. It mixes time bases (seconds used as a fundamental unit in hp vs hours), two different measurement systems are used (metric & US customary), and mixes mass units (lbm in the hp unit vs the gram).

About beer here, if you order a "pint" it might not be a pint at all. There is no regulation of what that means when ordering a drink in a restaurant, tavern, or bar. However, food labeling in stores is tightly regulated.
 
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isn't a high lt/100km bad ? don't I want to consume as few liters as possible ?

miles/lt ... OMG ! km/lt cross translates to mile/gallon. and 10 km/lt = 10lt/100km ...
so 1000km^2 = 10lt^2 ??

another day in paradise, or is paradise one day closer ?
 
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Sorry, wrong way around. Low l/100km seems bad compared to high mpg.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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someguy79 - in the UK the actual size of a pint of beer is highly regulated.

Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​
 
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