Steam Piping and Compressed Air Piping ( Material Used ) 7

[sandeshrego]

Could someone please let me know which material is used for Steam Piping? ( Is it SS, GI or MS? )
Will is be threaded or welded?

Also what about the Compressed Air Piping?

 

[europipe]

Check your pipespecs, or steal them from amother company.
Maybe Norsok has something on the internet

 

[moltenmetal]

Compressed air: for headers, most people use threaded piping, 150# class fittings, either galvanized or plain steel. At sizes above 2", we use Victaulic. Pipe is carbon steel in either case, and fittings are malleable cast iron. Drops to individual users can be done using polyethylene or polyurethane or copper tubing. Some people want their air systems cleaner than either of these options will offer, so they use stainless steel.

Steam: low pressure, people do still use threaded. Once you're above 150# class for sure, it switches to socket welded. Carbon steel is typically used except for "clean steam" applications where there is also no risk of chloride contamination, where stainless steels are used.

 

[21121956]

Hello everybody:

For steam, take a look to the Spirax Sarco info in this link

http://www.spiraxsarco.com/resource...steam-distribution/pipes-and-pipe-sizing.asp.

El que no puede andar, se sienta.

 

[Duwe6]

The general preferences for steam piping is to use Sch80 for the small-bore [<2"/50mm] and seamless. Gives more robustness and corrosion allowance than Sch 40. Allows big guys to climb around on it without [much] damage.

At 2"NPS and larger, A53 Gr. B seamed pipe receives 100% testing of the seam in addition to the pipe mill hydrostatic test. Most folks, including me, are comfortable using seamed big-bore pipe for steam; plus it gives a huge cost savings. Steam pipe should be welded; socket-welded up to 2"NPS, buttwelded starting at 2"/50mm. Sch40 is sufficient for Class 150 and 300 flanges; probably should go to Sch80 at Class 600. For short outdoor runs [<100m] I have used stainless steel instead of A53. Stainless was about the same price as the blasted, primed, and painted A53, so for simplicity we went with s/s.

 

[curtis2004]

sandeshrego,

Duwe6 responded to your question pertaining steam piping. Most pipe specs are similar what was described. Although pipe specs will change depending on steam pressure and temperature (since you didn't give us your steam service parameters). I'd like just to add that threaded connections are only used for instrumentation, vent/drain piping, and equipment with connection sizes smaller than 2".

In case of Compressed Air piping, it will be similar to lower pressure steam piping. However, for outdoors compressed air piping for cold climates with winter temperatures lower than -20F, you have to select low temp pipe (something like A333), fittings, flanges, and valves.

Regards,
Kurt

 

[sandeshrego]

Hey Guys,

Thank you for being so helpful. I am a Graduate Engineer. However back in India we lack practical knowledge.