Comparison of GB3091-2015 and SY/T5037-2012 standards
Thread Content
May I ask, which is more expensive in terms of price, the welded pipes made in accordance with standard GB/T3091-2015 or those made in accordance with standard SY/T5037-2012?
The last edit to this post was made by snmyf on 2016-12-23 at 13:42. The pipe diameters specified in the GB3091 standard are generally below DN150; most of these are pipes with straight welds. Galvanized pipes are used quite frequently, and cast iron pipes are also employed for handrails. Pipes with spiral welds have not been seen yet； The pipe diameters specified by the SY5037 standard are generally above DN250, and they are spiral-welded pipes ； The diameters of the two types are different; spiral welded pipes with extremely large diameters (DN100 and above) have relatively high prices due to order-based production and capacity constraints
Both standards include straight seam welding and spiral welding; take another look!
You are right; SY/T5037-2012 has indeed been revised. It used to only cover spiral welds. Thank you
What I mainly want to discuss are spiral welded pipes with a diameter of over 600. Some manufacturers say that GB3091 is expensive, while others claim that SY5037 is expensive; it’s confusing
SY/T5037-2012 requires double-sided welding for spiral welded pipes, while GB/T3091-2015 does not have such a requirement; however, the number of non-destructive inspection tests required for 3091 pipes seems to be higher than that for 5037 pipes
SY/T5037-2012 has been revised; the previous version only covered spiral welds
Hasn’t anyone studied this issue? These are the two primary criteria that designers consider when choosing low-pressure pipes
The pipe diameters specified by the SY5037 standard are generally above DN250, and they are spiral-welded pipes； The diameters of the two types are different; spiral welded pipes with extremely large diameters (DN100 and above) have relatively high prices due to order-based production and capacity constraints
The pipe diameter series are different; one is Series A and the other is Series B