DannyD. posted for all of us...

And I know how to SNIP


Tekkie® wrote, on Sun, 06 Jul 2014 13:16:23 -0400:

This is true. Back in my ff days we had boards with the different adapters
used. It all depended on which the water company used. Sometimes even the
fire truck manufacturers would have their own threads!

This local Santa Clara County government PDF says all the wharf hydrants
have to have the same threads (which makes sense):
http://www.sccgov.org/sites/fmo/docs...Hyd-070910.pdf

Wharf Hydrants are residential type fire hydrants with a single two
and one-half-inch (2-1/2-inch) outlet and a control valve (operated by a
pentagon nut with no handle), typically supplied from an on-site tank or
Shared Water System. (See Figure 1)

Hose threads for all hydrants shall meet National Standard Thread (NST)
requirements. Piping and appurtenances shall be a minimum diameter of
4-inches.

It's interesting to see in the diagram in that PDF the buried "thrust
block".

I had never seen a thrust block before ... have you?


No, but then again our ff water is either supplied by municipal hydrants or
tanker ops. The hydrants are here are dry and have drains. I can see the
purpose of the thrust block as if the hydrant is closed rapidly, the water
hammer may blow the connection at the elbow. It also appears (IIRC) the OP
hydrant is too low to ground...

We had a bridge rebuilt. The water co laid new lines with a hydrant at one
end of the bridge, ok. Guard rail was installed about 3" from the hydrant.
It has been awhile but I believe the line had to moved for clearance. Had to
go through the municipal engineer.


--
Tekkie