2007-03-09 05:30:35 · 6 answers · asked by vikaas_gupta10 1 in Science & Mathematics ➔ Engineering
stainless steel
2007-03-09 05:36:26 · answer #1 · answered by Dr W 7 · 1⤊ 0⤋
Normally the pressures and temperatures involved are low and carbon steel material (such as A 106 Gr. B) is suitable, sch 40 for sizes 50 and larger and sch 80 for smaller sizes.
If the pipe runs in "clean" areas, insulation containing fibrous materials should be avoided. And a stainless steel metal covering over the insulation is preferred.
2007-03-10 15:05:07 · answer #2 · answered by r_ravoori 2 · 0⤊ 0⤋
It depends upon the application.Whether it is a direct or indirect use of steam.
Also, it depends upon the pressure of the steam.(HP/LP).
Also, it should be as per the Boiler regulation act which covers the all the designed parameters.
But looking to the pharmaceutical application,it is wise to use the stainless steel grade material with suitable grade and schedule(indicator of wall thickness).
For LP steam ,you can use c.s. seamless pipe,sch80 pipe for indirect heating.
Glasswool or ceramic wool is to be used as a insulting material depending upon the temperature.
2007-03-09 05:56:56 · answer #3 · answered by namrata00nimisha00 4 · 3⤊ 0⤋
"Stainless Steel
Any one of a family of alloy steels usually containing 10 to 30 percent chromium. In conjunction with low carbon contents, chromium imparts remarkable resistance to corrosion and heat. Other elements such as nickel, molybdenum, titanium, aluminum, niobium, copper, nitrogen, sulfur, phosphorus, and selenium may be added to increase corrosion resistance to specific environments, . . ."
I would recommend black iron schedule 80 or higher, especially for process steam. Iron is considered a beneficial trace element. Chromium is considered a hazardous metal. Steam corrodes the interior of piping and vessels, and thus carries minute quantities of anything the piping is made of.
The governing agency here is, of course, the
FDA:
"Product contact surfaces of process equipment and piping are constructed of 316L stainless steel and fabricated according to sanitary design standards." (p. 15)
The pdf for this reference is poor quality, and is not titled. Other files listed in a search of the FDA website for "steam piping" are listed in the third reference.
2007-03-09 07:01:38 · answer #4 · answered by Helmut 7 · 0⤊ 0⤋
wht for the steam is used there
Best thing is SS pipes covered outside with heat insulation
The pipes must be qualified by Medical standards too
2007-03-09 05:42:03 · answer #5 · answered by babu n 2 · 0⤊ 0⤋
iron
2007-03-09 05:48:10 · answer #6 · answered by five s 1 · 0⤊ 0⤋