Nitrogen Piping

[gilbert123]

Can someone please tell me what type of piping is used for nitrogen gas and where I could find specs for nitrogen gas piping. Thanks all

 

[Drazen]

It depends on intended use of nitrogen. Because of its characteristics, it is often used in some hygienic applications. We use it as backpressure in asseptic filling line and in that case food grade stainless steel is almost mandatory.

In medical gas installation you can use copper with fusion fittings.

 

[quark]

Drazen!

Do you work in a pharmaceutical company? By the way what is a food grade stainless steel? or do you mean electropolished stainless steel with food grade gaskets?

I presume you reply me

Regards,

Truth: Even the hardest of the problems will have atleast one simple solution. Mine may not be one.

 

[Drazen]

quark,

You got to the point,

As I am in Europe and we use mostly DIN norms and even partly old Russian GOST, I used our internal term (I am working in beverage bottling plant).

Looking at AISI, we have problems with 304. Our tuff sanitation system includes caustic, acid and hot water treatment and causes visible pitting on 304 after 1-2 months of usage. So 316 is considered minimum for sanitary installation. Of course, this is based on our current conditions and mandated sanitation program, but I can presume it happens similarly in this industry.

 

[TBP]

It really depends upon where you're using it, gilbert123. It could fall under ASME B31.1, or ASME B31.3, or if you're using it for refrigeration purposes, ASME B31.5.

 

[quark]

Drazen!

That system is SIP/CIP (steam in place/clean in place) and is a standard practice in pharmaceutical companies too. The electropolishing and subsequent passivation (with HN03) will form chromate layer on the internal surface and prevents corrosion and SS 316L is a better option.

Three Beers and Three Cheers,

Truth: Even the hardest of the problems will have atleast one simple solution. Mine may not be one.

 

[gilbert123]

thank all for your help