Higher Rating for Small Fittings
Higher Rating for Small Fittings
(OP)
Hi everybody,
In all of the projects that I was engaged in, small fittings (<2") have higher rating with regard to larger ones. Does anybody know the reason for this?
In all of the projects that I was engaged in, small fittings (<2") have higher rating with regard to larger ones. Does anybody know the reason for this?





RE: Higher Rating for Small Fittings
See the post on 31.3 structural strength which covers similar things. Also a #900 flange is the same dimensions as a#600 for 2" and below. There is so little difference in price it is easier to have one size of pipe and flanges to cover all pressures.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Higher Rating for Small Fittings
RE: Higher Rating for Small Fittings
That's all there is to it I'm afraid, there's no magic formula or greater technical reason, just years of past experience.
LI
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Higher Rating for Small Fittings
- In small sizes a 3000# fitting doesn't cost a whole lot more than a 150# fitting, but:
- It's less likely to break if stepped on.
- It's less likely to break if something heavy falls on it.
- It's not going to be perforated by corrosion anytime soon.
- It will be useful when the rig crew needs to kluge up a hydraulic system to deal with some emergency, but they have no stock of loose fitings, so they have to cannibalize your product.
Mike Halloran
Pembroke Pines, FL, USA
RE: Higher Rating for Small Fittings
donf
RE: Higher Rating for Small Fittings