Scantlings

OK, guys, you tell me. If one buys a 1 1/2" hose, does one have a right to expect that it's 1 1/2" end to end?



Inconsistencies like this bug the hell out of me. BTW, this is a low pressure discharge hose. I think the fitting is designed for a high-pressure or suction hose. If I'm bothered too much, I can try to find a plastic fitting with a larger inside diameter. Intellectually, I know this doesn't matter at all. The amount of water that's going to pumped could go through a garden hose without too much trouble.

I can't remember but Hose is sized by one of ID or OD, and pipe is sized by the other. Why? I have no idea. Just to drive some of us crazy I think.

It's pretty simple really. Anything hard is measured on the outside. Outside diameter or O.D. Anothing soft is measured on the inside. Inside diameter or I.D.

So anything hard like metal or hard plastic is measured to the O.D., and anything soft and flexible like rubber, silicone, etc is measured to the I.D.

JoeP wrote:It's pretty simple really. Anything hard is measured on the outside. Outside diameter or O.D. Anothing soft is measured on the inside. Inside diameter or I.D.

So anything hard like metal or hard plastic is measured to the O.D., and anything soft and flexible like rubber, silicone, etc is measured to the I.D.

OK, I get that. But then one has to remember the thickness of the walls of the hard stuff so that one can get the right sized hose to fit over it, if you are using agricultural techniques as opposed to a proper hose barb.

BeauV wrote:

JoeP wrote:It's pretty simple really. Anything hard is measured on the outside. Outside diameter or O.D. Anothing soft is measured on the inside. Inside diameter or I.D.

So anything hard like metal or hard plastic is measured to the O.D., and anything soft and flexible like rubber, silicone, etc is measured to the I.D.

OK, I get that. But then one has to remember the thickness of the walls of the hard stuff so that one can get the right sized hose to fit over it, if you are using agricultural techniques as opposed to a proper hose barb.

Not certain I get you. Hard pipe is generally intended to have exterior threads. Hose is intended fit over pipe (even if barbed). I” hose goes over a 1” pipe. What does the wall thickness of the pipe have to do with it?

LarryHoward wrote:

BeauV wrote:

JoeP wrote:It's pretty simple really. Anything hard is measured on the outside. Outside diameter or O.D. Anothing soft is measured on the inside. Inside diameter or I.D.

So anything hard like metal or hard plastic is measured to the O.D., and anything soft and flexible like rubber, silicone, etc is measured to the I.D.

OK, I get that. But then one has to remember the thickness of the walls of the hard stuff so that one can get the right sized hose to fit over it, if you are using agricultural techniques as opposed to a proper hose barb.

Not certain I get you. Hard pipe is generally intended to have exterior threads. Hose is intended fit over pipe (even if barbed). I” hose goes over a 1” pipe. What does the wall thickness of the pipe have to do with it?

Yes, what Larry Said. For example Sch 80 pipe is thicker than Sch 40 pipe but the extra thickness throws to the inside of the pipe, so the O.D. is the same.

JoeP wrote:

LarryHoward wrote:

BeauV wrote:

JoeP wrote:It's pretty simple really. Anything hard is measured on the outside. Outside diameter or O.D. Anothing soft is measured on the inside. Inside diameter or I.D.

So anything hard like metal or hard plastic is measured to the O.D., and anything soft and flexible like rubber, silicone, etc is measured to the I.D.

OK, I get that. But then one has to remember the thickness of the walls of the hard stuff so that one can get the right sized hose to fit over it, if you are using agricultural techniques as opposed to a proper hose barb.

Not certain I get you. Hard pipe is generally intended to have exterior threads. Hose is intended fit over pipe (even if barbed). I” hose goes over a 1” pipe. What does the wall thickness of the pipe have to do with it?

Yes, what Larry Said. For example Sch 80 pipe is thicker than Sch 40 pipe but the extra thickness throws to the inside of the pipe, so the O.D. is the same.

Well, all over MAYAN there is 2.5” pipe with 2 7/16th hose on it. When I asked the hose distributor guys in LA, they say: You want it tight by 1/16 so it doesn’t leak. Thus, my confusion. It is hard to get it on, but it certainly doesn’t leak.

OK now i understand the confusion. You are talking about tubing rather than pipe. 2-1/2"nominal ips pipe is actually 2-7/8" OD whereas 2-1/2" tubing is 2-1/2" OD. Pipe is the heavy iron stuff you would find used in household plumbing etc whereas tubing is generally thinner walled and would be used for fuel systems etc.

Even I get confused (may be now) sometimes which is why I have charts at hand at work to make it easy.

Here is a primer on pipe and tubing: http://www.atc-mechanical.com/tube-pipe-101/tube-pipe-size-overview/

JoeP wrote:OK now i understand the confusion. You are talking about tubing rather than pipe. 2-1/2"nominal ips pipe is actually 2-7/8" OD whereas 2-1/2" tubing is 2-1/2" OD. Pipe is the heavy iron stuff you would find used in household plumbing etc whereas tubing is generally thinner walled and would be used for fuel systems etc.

Even I get confused (may be now) sometimes which is why I have charts at hand at work to make it easy.

Here is a primer on pipe and tubing: http://www.atc-mechanical.com/tube-pipe-101/tube-pipe-size-overview/

Joe,

YES! Exactly. Much of MAYAN's "plumbing" is bronze pipe, which has the larger OD. You've solved the mystery. Thanks a heap for that link.