Hydraulic Cylinder Codes
Hydraulic Cylinder Codes
(OP)
This may seem like an odd question, but I have always operated under the assumption that hydraulic cylinders should be designed and manufacturered to ASME Section VIII code since I consider them to be pressure vessels. I have worked for a cylinder manufacturer and we desgined per VIII code, but the weld procedures were not written/approved with section VIII in mind. Upon discussing this with a weld engineer today, Section VIII requires that anything over 15 PSI and material over 3/4" thick be post weld heat treated. I do not know any cylinder manufacturer's who PWHT. So, that leads me to the question:
When writing and qualifying weld procedures for hydraulic cylinders, what code(s) should be considered?
When writing and qualifying weld procedures for hydraulic cylinders, what code(s) should be considered?





RE: Hydraulic Cylinder Codes
Most cylinder manufacturers build to the standards published by the National Fluid Power Association.
You can purchase these on their website.
http://w
The standards you are looking for are ANSI(NFPA) T3.6...
RE: Hydraulic Cylinder Codes
Look at CSA Z245.15, API 6D for reference on this. The first is particularly good with Figure 12 showing the required butt weld geometry and materials discussing PWHT as a means of stress relieve at the welded joint.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Hydraulic Cylinder Codes
You might give the a call to see if they have to comply with any codes.
http://www.crconline.com/
RE: Hydraulic Cylinder Codes
Worry less about codes and more about procedures that make a successful product. If you are not sure of what to do contact a welding engineer with fluid power experience.
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: Hydraulic Cylinder Codes
Project Engineer
http://www.cognidyn.com/