Wikipedia claims that the figures shown on a fire hydrant sign are in SI units, though the example they depict would imply a 1mm pipe, which seems unlikely. From my youth I seem to remember that the upper figure was in feet and the lower in inches, which is somewhat more credible.
I'll check the upper distance figure, though I'm not going to open the hydrant lid up to see how big the pipe is. Anyone know what the correct unit is?
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Alfred
These are the Staffordshire Fire and Rescue notes on Fire Hydrants
How to Spot a Hydrant:
1) Look for the Marker Plate; a large black capital H on a yellow background.
2) Marker plates are fixed to yellow concrete posts at the roadside, or directly to walls or street furniture.
3) The number between the top of the H shows the diameter of the water main, in mm or inches, feeding the hydrant.
4) The number between the bottom of the H shows the distance in metres from the marker plate to the fire hydrant.
5) Hydrants can be found in the roadway, footway or the grass verge.
6) Look for the cast iron cover with the letters FH.
Thanks, Anonymous. That's the stuff!
Sounds good, except I have a hydrant outside my property that has 6 and 28 listed (upper and lower). So its a 6 inch diameter pipe right? but 28 meters away from the sign? its either very deep or incorrect because theres no way its 28 meters away. would this not be listed in feet since the top number is inches?
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