Note that that’s a UK pint which is different from a US pint.
Time longer than a second: Year, day, hour, minute.
A SI second is now defined as so many shakes of a cesium atom; fractions of seconds are metric. Yet the year, day, hour and minute are variable and are not pegged to the SI second. A minute can have more or less seconds than other minutes. A year can have more or less days than other years.
P.S. Notice how no one discussed metric time in this thread?
Any crane may be rated in kN but the vast majority, almost all the ones I’ve seen, are marked in tons.
Probably intended for the EU/UK market
It may be graded in US Pints and/or Cups for the US market.
PS> For the Scottish market the marking may be in “Wee Drams” (??)
Not for lack of trying. The French used a 10 hour day for a while. IIRC they also tried a 10 day week but nobody wanted to work 9 days and rest one.
In the SI system Crane SWL are not rated in Newtons, but in Kilonewtons (KN =1000 N)
The metric eqv. of 1 KN is 1 Metric Tonnes (m.t.)
Not so difficult to remember. (??)
Since the lifting range is important the cranes comes with a capacity chart/curve:
All cranes have to be marked with their SWL (WLL) at a specific range:
Or be rated in Tonnes/Meter (T/M) I.e. he lifted weight (in m.t) multiplied by the max. lifting range must not exceed a given number in T/M. (Mostly smaller cranes)
The real big cranes have their SWL marked on the hooks:
PS> Riggers added for scale
1 tonne - force (tf) = 9.80665 kilonewtons ( kN )
they are still looking for the class certificate on that chinese steel…
Yep good old metric system, you can choose which one to use
The decimal basis of the metric system works for the measurements that have an abstract basis.
Where there are (or were) connections to the real world, the distance from the equator to the pole (meters) or the force of gravity or the time it takes for earth to rotate or orbit the sun the simplifying assumptions don’t work as well as a basis.
some parts of it work, one litre of water is 1 kg and its 100mm x 100mm ( edit x 100), measurement works.
But lots of it is fudged to make it work, metric threads are just made up and have no basis in engineering whatsoever for example.
As I mentioned above there are multiple answers to pressure and force, what a cockup up.
One litre of water has a mass of almost exactly one kilogram when measured at its maximal density, which occurs at about 4 °C . It follows, therefore, that 1000th of a litre, known as one millilitre (1 mL), of water has a mass of about 1 g; 1000 litres of water has a mass of about 1000 kg (1 tonne or megagram).
Therefore the Sp.g. of water is 1.0
Note: this is correct for distilled water at 4C, when at 45dgr. Lat. and at sea level, with normal atmospheric pressure of 1.013 mb.
No. that is not correct. A liter measurement requires 3 dimensions. 100 x 100 x 100 mm.
Or to put it simpler; 1 x 1 x 1 decimeter.
I think the conclusion was metal failure in this case, not over weight limit.
But because of “metal fatigue”, not this time.
Not “fatigue” The hook was brand new.
Metal porosity caused by flaw in casting process:
Source: LinkedIn
The actual mode is irrelevant, the point was it failed at less than the advertised load and in the context of this thread, who cares why it failed? We were not analyzing the failure mode.Have you no sense of irony?
oops yes a cube has 3 measurements…
Standard measure is based on the polar diameter of a planet. The effort to measure a quadrant of our planet from near the netherlands to the tip of spain were so fraught with errors it was eventually regarded as meaningless but after i think 4 years and much money the modern metric system was adopted based on this survey which tried confirming the polar diameter.
It is argued a system of fives is most effective.
Measurements at the great pyramid of cheops established our polar diameter to be within not discernable differences of modern measurements today!