9 Unacceptable Welds for High Purity Applications

9 Unacceptable Welds for High Purity Applications

Aug 12, 2015

Have you ever wondered why welds fail? When welding in a high purity environment, several factors can render a weld unacceptable: heat tint, a lack of...

Pipetite Stands the Test of Time

Pipetite Stands the Test of Time

May 13, 2015

Pipetite is often viewed in terms of its use inside plants, but did you know that it’s also a solution for sealing outside pipes or lines? Recently a Pipetite user asked if the product’s silicone rubber would remain pliant indefinitely, and the response was a resounding, “Yes!”

Poll: Does Stainless Steel Contain Iron?

Poll: Does Stainless Steel Contain Iron?

Dec 18, 2012

We are always curious about thoughts regarding stainless steel. Please take 30 seconds to respond to this poll.

Passivation vs. Electropolishing

Passivation vs. Electropolishing

Dec 11, 2011

Is electropolishing actually necessary given that a 1.0 or greater Cr/Fe ratio can be achieved by passivation alone? The short answer? If a 1.0 Cr/Fe ratio is all you are trying to achieve, no it is not. Now for the long answer. First, the 1.0 or greater Cr/Fe ratio indicated in the ASME BPE standard is a minimal requirement. The best passive and corrosion-resistant surfaces will have a Cr/Fe ratio in excess of 1.5/1, again achievable by passivation alone. The pharmaceutical industry, in most cases, requires a 15-25Ra value typically achieved through a mechanical polishing procedure. It is this procedure that, in my opinion, causes many of the problems experienced today with the formation of the “gray residue” and Class 1 rouge that has plagued end users for years.

Skin Deep: The Basics of Surface Finish

Skin Deep: The Basics of Surface Finish

Oct 11, 2011

This brief article will deal with a small part of a much bigger topic: surface finish. We will be looking at commercially available finish options and how they are measured. The surface finish of process systems components plays a very integral role in the cleanability and sterility of the system. The most commonly used unit for surface finish is...

The Right Hands for the Job: Alloys

The Right Hands for the Job: Alloys

Mar 23, 2011

For any project requiring alloy equipment, the best thing to do is look at the experience and expertise with the alloy. The first requirement for a fabricator should at a minimum be ASME Section VIII Div 1 certified for the manufacture of pressure vessels, even for equipment not requiring pressure service.