Valves to use in Class 1 Div 2 Digester Site

[yhchen86]

What is required? I have not been able to find out the type of valves that I should use. I've found some standards in CSA/TSSA for manual shut off valves for the digester/landfill sites but do not see anything regarding electrically/pneumatically operated valves.​

Thanks in advance for anyone's input.

 

[yhchen86]

I would like to add that it is in a low flow (less than 15 SCFM) and low pressure (less than 5psi) system.

 

[moltenmetal]

Electrical area classification has nothing to do with selection of manual valves. Electric actuators or solenoids, if used, need Cl1Div2 approval. So, what's your question, really?

 

[USAeng]

unrelated to your question - but for any manual valves - do yourself a favor and use butterfly valves. We have plug valves on our site and while they work -they are more expensive and most require many turns to open close. Its annoying.

If you do use anything electric or pneumatic - just make sure it meets the hazardous area classification. You should check to make sure it doesn't have to be class 1 div 1 for a valve in that piping system. I see in NFPA 820 which governs the hazardous locations for digesters - they state the area around piping is class 1 div 1 - but stuff at our plant doesn't totally comply with this. For instance the manufacturer of our flare used a nema 4x box on their skid which is right next to the flare and piping. gotta pick your battles sometimes I guess

What state are you in? Is it an anaerobic digestion site? Are you burning the biogas in CHP's for power? What are you doing with the digested sludge?