Cleaned and Bagged Fittings: Cleaning and Warranty

What's the Real-World Risk of Field-Cleaned Fittings?

The gap between "cleaned" and "verifiably cleaned" shows up on jobsites more often than it should. On one bulk oxygen system installation, a contractor had the piping in place and ready for commissioning, but when the delivery driver arrived to fill the tanks, he refused. He'd never seen press fittings used in a bulk oxygen system before and had no way to confirm the components had been cleaned to the codes and standards the system required. The project stalled at the finish line over a question that should have been answered long before installation day.

This is the ambiguity field cleaning and after-purchase cleaning both carry: even when the work gets done, there's often no clear, verifiable answer to "Cleaned to what standard, and how do we know?"

How Do ASTM G93 Cleaning Standards Affect Project and Warranty Confidence?

Much of this ambiguity starts upstream in the specification itself. A project calling out “shall be cleaned in accordance with ASTM G93” sounds precise, but ASTM G93 defines multiple cleanliness levels within that standard. Without a level specified, a contractor, engineer and owner can all have a different understanding of what “cleaned” actually means for that job, and the risk of a mismatch doesn’t land on any one party predictably. It can fall on the installer’s experience, the clarity of the spec language or assumptions no one checked early enough.

That ambiguity can carry a warranty cost, too. When standard fittings are cleaned in the field or after purchase, the work happens outside the manufacturer’s process, and field-cleaning standard fittings can void the manufacturer’s warranty. The project ends up with cleaner components but without the coverage that’s supposed to stand behind them.

For high-purity gas piping systems, Cleaned and Bagged fittings remove that ambiguity before it starts. Every fitting is cleaned to ASTM G93 Level A, the most stringent of the standard’s predefined cleanliness levels, through Viega’s quality-controlled process. Each fitting is then individually bagged to maintain that cleanliness through shipping and storage until installation, with the cleaning standard and date labeled on every bag.

Because cleaning is built into Viega’s process rather than added after purchase, the warranty stays intact. Cleaned and Bagged fittings are backed by Viega’s 2-year industrial warranty, and Viega is one of the only press connection manufacturers to provide a warrantied Cleaned-and-Bagged offering, giving engineers, contractors and owners greater confidence in demanding environments.

What Happens During the Cleaned and Bagged Cleaning Process?

Cleaned and Bagged fittings go through a defined, multi-step process designed to remove contaminants and verify cleanliness before they ever leave the facility:

• Cleaning and inspection performed in an ISO Class 8 cleanroom to remove particulates and residues introduced during manufacturing and handling
• Hydrocarbon and oxide removal, followed by multiple rinse cycles using ultra-pure water
• High-purity nitrogen drying and moisture control
• Individual bagging after drying and inspection to maintain that cleanliness through shipping and storage until installation

100% inspection of every fitting (bright light, black light and swab test analysis), supported by laboratory analysis of samples collected from every production batch, verifying hydrocarbon, particulate and non-volatile residue cleanliness levels.

That last point matters more than it might first appear. Rather than spot-checking a percentage of a batch, every single fitting is inspected individually before it ships, and every production batch is verified through laboratory analysis.

How Does Cleaned and Bagged Fit Into an Existing Installation Process?

Switching to Cleaned and Bagged doesn’t mean changing tools or connection methods. It uses the same press connections and tools engineers and contractors already rely on. The difference is what arrives on the jobsite and what's backing it.

That said, two questions tend to come up early when a project team encounters Cleaned and Bagged for the first time:

• Is this allowed by code? Hearing "cleaned for oxygen service" often leads people to think of medical gas systems. Press fittings aren't an approved connection method under NFPA 99 (medical gas), but laboratory gas piping is typically governed by other codes and standards, such as NFPA 55, and press connections are listed under ASTM F3226 for ASME B31 piping. Other applications – bulk gas systems, high-purity and ultra-high-purity gas systems – center on contamination control rather than a medical gas designation.
• Has this been installed in a similar application before? Design teams understandably want some precedent before specifying something new. An install history in comparable applications goes a long way toward that comfort. Viega press technology has an established install history in laboratory and process gas systems, and Viega’s engineering team can share application experience relevant to your project.

Cleaned and Bagged fittings are not intended for medical gas systems (NFPA 99), FDA food-contact applications or pharmaceutical hygienic service and may not be used for these applications.