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Thanks. I undertand both viewpoints. ASME and EN13445 can be viewed as unified wholes, with material (acceptability and allowables), and calculation (methodology & safety factors) considered interdependent. This would clearly make sense if one code had higher safety factors on the calculation...

Hmmm. Our Nobo separates material acceptability and stress allowables from calculation method. So he has not raised concerns regarding using ASME analysis and calculations on materials not on the ASME customary material list. (Another bolt example). ASME lists ASTM A193 B7 bolts with a stress...

"Be careful though that most materials don’t comply with ASME S8D1" Yes, this at times causes a real problem. For example here in the US I have seen "ready-to-hone" seamless cold-drawn tube produced to ASTM A519, with DIN St52.3 chemistry specified (200mm bore 241mm OD). It has excellent...

Perusing EN1515-4 (Part 4: Selection of bolting for equipment subject to the Pressure Equipment Directive 97/23/EC) Table 3 Shows 8.8 per ISO 898-1 for -10°C - 300°C use. ISO 898-1 gives tensile min of 830 and yield of 660 MPa. Is 8.8 bolting common for PED vessels? What would be the reasons...

XL83NL, Tremendously helpful post and all the way along in this thread. Thanks.

Thanks XL83NA, I had the impression the reason hydraulic cylinders are easy is the incompressible fluid puts them in PED Category 1. In Category 1 the requirements for specific quality control documentation go away, as does the PED specific welding requirements. I have the impression that for...

Thanks

Thanks for responding r6155! Our temperature operating range is 10°C to 40°C. Out problem is not meeting the temperature range. It is having paperwork for the bolts that satisfies our Notified Body. Do you know of a common bolting type used in Europe for PED pressure Vessels? Thanks.

Thanks for responding XL83NL! Yes, it has an internal piston and rod that move. A picture that includes a cross-section is at https://files.engineering.com/getfile.aspx?folder=3e90ea37-35f6-4caf-a090-2613d48e914e&file=Actuator.png We are looking at changing our NoBo. So far the only US located...

Thanks again. PED Annex 1 Article 1 2.1.5 "Assemblies” means several pieces of pressure equipment assembled by a manufacturer to constitute an integrated and functional whole." This is a reasonable description of our Pneumatic Actuator. PED Annex 1 Article 1 2.1.5 "equipment comprising...

Hi, You can see a system photo at http://www.seattlesafety.com/products/servosled-catapult-sled-systems/ The system accelerates a payload (such as a car body with dummies and airbags inside bolted to a guided platform) to the operator's acceleration vs. time curve. The payload is thousands of...

Thanks! We are having a notified body do our PED conformity assessment (TUV Sud) our company's core competence isn't pressure vessels, but we need to PED certify a 3500psi 18.5 inch bore pneumatic actuator in our system. The bolts hang us up because our notified body considers them pressure...

What is the common go-to bolting in the EU for PED vessels? Any recommended suppliers? Under ASME ASTM A193 B7 is perhaps the most common material for bolting for pressure vessels where there are no special temperature or corrosion resistance requirements. It is widely available and...