Specifying pipe to ensure quality 1

[MisterDonut]

Which standards should be specified in order to ensure quality pipe materials? I normally spec the grade, e.g. ASTM A106 Grade B, and the dimensional standard ASME B36.10.
Other than these, is there an applicable standard to ensure we don't get low-quality pipe on the project from a manufacturer that might misrepresent the materials?

 

[SNORGY]

ASTM / ASME SA-960 for fittings...

Towards the back of ASME Section II, I believe there are standards for chemistry and rejectable defects applicable to pipe and fittings. Presumably, these will already have been met in being able to categorize the pipe in the first place.

Regards,

SNORGY.

 

[BigInch]

What possible standard would do ANY good with a manufacturer that might misrepresent the materials? If that were the case, I'm sure no standard would be beyond reproach. Wouldn't a better QAQC procedure be to visit the supplier and get to know them really well before placing an order with them? Other than that, if for some reason you found it necessary, you could mention that thay follow the take-down standard. Being, if they should ever be so dumb as to try that one on you, you'll take them down so low they won't ever sell a toothpick to anyone after that. But it would be a whole lot better thing to do first, if you ever felt the need to say such a thing, that you simply turn around, get in the truck and put it in reverse.

**********************
"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[MJCronin]

Donut...

"Which standards should be specified in order to ensure quality pipe materials?"

If you are in the USA and your suppliers know that you have, and are bound by the force of contract law behind you, specify ASTM standards.

If you want it cheap....(and most people do) and want to take a risk without any international force of law behind you.....buy it from China..!!!

Sometimes lawyers and the ability to sue is a good thing.

Defective materials purchased from countries with no effective force of law take years and years to resolve conflicts in international courts.

http://www.eng-tips.com/viewthread.cfm?qid=195299&page=3

-MJC

 

[BigInch]

Actually China resolves its legal matters much faster than any "rule of law" country.

**********************
"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[rneill]

Ah, but only after they cross a certain threshold ... up to that point, there are few consequences.

 

[BigInch]

Right, but its not like you'd be likely to resolve any legal problem in the US, England or Spain etc. within a year, or two either. But none of this has much to do with the original question.

**********************
"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[dcasto]

like this?

1. All pipe is to be made of a long hole, surrounded by metal or plastic centered around the hole.

2. All pipe is to be hollow throughout the entire length – do not use holes of different length than the pipe.

3. The I.D. (inside diameter) of all pipe must not exceed the O.D. (outside diameter) – otherwise the hole will be on the outside.

4. All pipe is to be supplied with nothing in the hole so that water, steam or other stuff can be put inside at a later date.

5. All pipe should be supplied without rust – this can be more readily applied at the job site. N.B. Some Vendors are now able to supply pre-rusted pipe. If available in your area, this product is recommended as it will save a lot of time on the job site.

6. All pipe over 500ft (153m) in length should have the words “long pipe” clearly painted on each end, so the Contractor will know it is a long pipe.

7. Pipe over 2 miles (3.2km) in length must have the words “long pipe” painted in the middle, so the Contractor will not have to walk the entire length of the pipe to determine whether or not it is a long pipe.

8. All pipe over 6? (152mm) in diameter must have the words “large pipe” painted on it, so the Contractor will not mistake it for small pipe.

9. Flanges must be used on all pipe. Flanges must have holes for bolts quite separate from the big hole in the middle.

10. When ordering 90 degrees, 45 degrees or 30 degrees elbow, be sure to specify right hand or left hand; otherwise you will end up going the wrong way.

11. Be sure to specify to your vendor whether you want level, uphill or downhill pipe. If you use downhill pipe for going uphill, the water will flow the wrong way.

12. All couplings should have either right hand or left hand thread, but do not mix the threads – otherwise, as the coupling is being screwed on one pipe, it is unscrewed from the other.