In the past, the process of manufacturing metals would create a product that would not be suitable for high purity applications. This would require cleaning or flushing systems after installation, as well as verification that the system was clean and ready for use. With modern advancements such as electric furnaces and cleanrooms, stainless steels can be produced, formed, and packaged inside high grade cleanrooms, and with virtually no contaminants such as total hydrocarbons (THC’s) or particulates. This allows installers and fabricators to utilize protocols to keep the materials clean throughout the process of installation. It generally costs less to put in...

In the past, the process of manufacturing metals would create a product that would not be suitable for high purity applications.   The old manufacturing process would require cleaning or flushing systems after installation, as well as testing & verification that the system was clean and ready for use. With modern advancements such as electric furnaces and cleanrooms, stainless steels can be produced, formed, and packaged inside high grade cleanrooms, with virtually no contaminants such as total hydrocarbons (THC’s) or particulates. This allows installers and fabricators to utilize protocols to keep the materials clean throughout the process of installation. It generally costs...

Copper and stainless steels are incompatible materials, since they have different electrode potentials that will undergo a electrochemical reaction upon contact with each other. When fabricating high purity stainless systems that require a connection to copper, be sure to use dielectric fittings.   Dielectric fittings feature a PVC or ceramic bushing to act as an interface between dissimilar materials, which prevents chemical reactivity and galvanic corrosion. Bryan Smith is a QA/QC Specialist with AMA Consultants Corporation. He specializes in cleanroom testing and certification, ultra-high purity (or UHP) process piping systems, and non-destructive testing. He has spent 7 years with AMA Consultants serving...

Maintaining a trouble-free corrosive gas system (such as Cl2 or BCl3) is a function of how clean you keep the gas.  Moisture is the#1 enemy of most corrosive gases, and it doesn't take much to wipe out your system. We've been reconditioning gas cabinets for 12 years now and have been around these systems for close to 30 years and we've seen systems that last a couple of weeks and others that are still running strong after 10 years. The difference between the two is how the systems are cared for. Here are a few things you can do to maximize...

When HEGA filters are first installed, they capture a very high percentage of acid compound -- say 98%.  As the carbon media begins to adsorb the target compounds, more of the compound breaks through to the other side (this is why it's called "breakthrough"). This breakthrough increases over time until the percentage coming through goes past the point where you set as your change out limit (i.e. - Filtration Group might say 20% - 100 ppb in 20 ppb out).   The negative number is simply an increasing breakthrough until ultimately the filter is completely spent and everything in passes through your...

The main concern here is maintaining gas state, which is as much dependent on pressure as it is temp. First of all, CL2 won't be an issue at the temp provided in either scenario.  Not sure what your set up looks like, so I’ll describe two scenario's for the BCL3:  Scenario 1 : No regulator at or near gas bottle.   BCL3 should be 15°C at the cylinder to stabilize vapor pressure and prevent condensation, which, in turn, will extend the life of the gas cabinet components.  Line temp should be 23-25°C, any decrease in pressure (example: regulator in a valve box)...

Double contained tubing or pipe is mandated in some cases. The use of double-walled piping for many below-ground transport systems in wastewater treatment plants and at sanitary or hazardous-waste landfills is common. Regulations affect below-grade transport of hazardous materials in fuel storage systems, tank farms, drainage or runoff from process plants, and some food-processing applications. Double-walled containment systems are also used for certain classes of toxic or corrosive chemicals, mostly gases, used in semiconductor fabrication, which I'll focus on here: Welding of these system is a simple process for the inner tube or pipe or the "Carrier or Process" pipe.  Common practice...

Your EH&S people are right on with this recommendation.  TMA is one of the gases, along with silane, that require a UVIR flame monitor to be installed in gas cabinets and VMBs in most localities.  Check with your local fire marshal to make sure, but according to our records, TMA gets a UVIR.   TMA produces small smoke partials with a very small leak, and comes off as noticeable white smoke.  Because it is a hydrocarbon it gives off a good CO2 spike that the UVIR keys in on.  Good luck with your system and call us if you need any...