Flanged drain valves vs Plugged drain valves 2

[-ARK]

Hi All,

Could you please let me know what is the scientific reason for choosing between these two options on drain valves or isolation valves?

Best regards,
ARK

 

[TiCl4]

Your question is a bit too broad to answer well, but I’ll give a general answer.

It should just normally be based on your pipe code and valve diameter. There are specific reasons for choosing threaded or flanged fittings. Some acid gas lines (thinking of Cl2 lines here), for example, tend to discourage threads at all due to the increased risk of crevice corrosion causing a leak, and forbid threads above a certain diameter.

Again, it just depends on your process fluid, conditions, and applicable pipe code.

 

[LittleInch]

Sorry but I don't understand the question. Flange dI get, but what are "plugged drain valves?"

Drawing, photo or sketch would eliminate uncertainty.

Also these things are not usually a "scientific" reason - more cost, custom and personal preference.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Latexman]

I *think* -ARK is asking how to close open ended valves, with a screwed plug or a blind flange.

The reason is not scientific; it is practical and availability. Basically, can the job be done with a wrench or adjustable wrench and one person. In general, for 1" diameter and less valves we use screwed plugs, and for 1.5" diamter and larger valves we use bling flange.

Good Luck,
Latexman

 

[georgeverghese]

In some of the larger operating companies, threaded pipe fittings are not permitted on flammable or toxic fluid services.

 

[mk3223]

The flanged drain valve is used in the flanged spool piping, including the plastic lined piping system. And, I saw the flanged drain valve was used in the galvanized Drinking Water piping.

 

[-ARK]

Perfect thank you so much all for your responses, sorry for the uncertainties, I am quite new here and learning to ask my questions the best way I can.