In this Newsletter:
ASME for Cryogenics
Cryogenic Transfer Lines
Specifying Stingers & Helium Hoses
ASME Standards for Cryogenic Equipment
Two common cryogenic equipment codes are the ASME Boiler & Pressure Vessel Code (BPVC Section VIII) and the Pressure (process) Piping Code (ASME B31.3). Certification stamps are available to manufacturers for some standards like BPVC. They indicate compliance and an acceptable quality program to maintain it (Technifab has the U and UM stamp for BPVC). In other cases, like ASME B31.3, it becomes more complex and more self-regulated.
Ultimately the system owner has the overall responsibility for code compliance per ASME B31 code. Tasks for a piping system may be divided among different parties; for example a designer may specify the piping requirements, the manufacturer may make the pipe, and someone else may install the system. Technifab can follow the standards for the pipe in a system, but if the sections of pipe are welded together onsite then those joints and welds also need to be to be made to ASME standards.
The standards are very long (BPVC is over 700 and B31 over 450 pages) and following the process correctly can be arduous. Material traceability is perhaps one of the more challenging aspects: the standard specifies that material composition be known, who produced it, when the materials were used, and quality/inspection records for seven years after making it.
Technifab is proud to be able to meet ASME standards for many of our products. Our installation crew even has ASME certified welders if you need it. You can read more about ASME requirements on our website.
Product Feature: Transfer Hoses.
Besides being asked if we can build products according to ASME standards (we certainly can!), we are also asked if our transfer hoses work with specific cryogens. Our standard in-stock vacuum-jacketed hoses are suited for liquid nitrogen, argon, hydrogen and LNG. We also make plenty of liquid oxygen and CO2 hoses, along with liquid helium transfer hoses. Our website has more on transfer hoses or call us if you need more information.
Liquid Helium Specifying Guide
Over the years there have been a lot of different kinds of liquid helium transfer hoses and stingers used to withdraw and transfer liquid helium from dewars to different equipment. Some use valves, some have different tips, and some have different bayonet/supply connections. Technifab has put together a list of the commonly used configurations that might be used in your operation. We can also provide just about any style you need. Check out the Liquid Helium Specifying guide next time you need a specific hose.
Most of Technifab’s product line over the last 20 years has utilized vacuum insulation. Creating a high level of vacuum that stays for the life of the product in a production environment is one thing that makes us different. For example, the vacuum level we produce in our pipe and dewars is what scientists consider a “very high” vacuum. At those levels something as insignificant as a fingerprint can outgas and later cause problems, which is why many consider our 10 year warranty on rigid vacuum jacketed pipe remarkable. A lot of people can’t accomplish that. If you’d like to read more on vacuum technology and its use in cryogenic equipment visit the cryogenic resource library on our website.
You might also enjoy seeing copies of our past newsletters.