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We have got a stainless steel valve 16" class 600 and its a cold service natural gas where the tempratures reach -60 we want to replace the gasket but the available gasket is PTFE with stainless steel inner race and a coated carbon steel outter race so os there any worry aboit the carbon steel...

i have a problem that too much bolts in my plant are rusted and corroded what are the possible ways to fix this problem other than HOT BOLTING what i mean is ways for cleaning ?

I think the both extended bonnet and extended butt welding seems to be right but extended point is more correct because of the insulation as the temprature at tgis area reach -40 an below thanks guys for your help

For the 1" manual ball valve class 600 st.st i found it written on the nameplate the ends are EB and i dont know what EB means? So i need help? http://files.engineering.com/getfile.aspx?folder=3e12bff9-e767-4d5f-bcd1-30569104564d...

Hi EmmanuelTop, yes you are right, i just wanted to thank you as you replied me in more than post & a thanks for every body who tries to help here :) :).

IVANOVIC YOU ARE THE ONE WHO ALWAYS HELPS ME THANKS ALOT

I want to start studying selection of manual valves and flow criteria inside valves, so I need a guidance like some books or softawre for fluid simulation?

I think you are tqlking about full bore and reduced bore but there is although a regular bore type As I remember?

Some times I find full port or bore some times I found it written regular so my Q is what is the difference and the selection of the bore type depends on what other than pigging.

Yes I was asking for a stainless steel valves I have another question in the valve specs it was written OS&Y and I dont know what it means

i asked for a quotation for a stainless steel globe valve asme class 300 designed as per API 600 but I received an offer for a globe valve designed as per api 603 so what is the difference ?

Chicopee I really dont know the origin of manufacturing But in our company we dont use Chinese products.

Thanks very much dear guys I found that for sizes more than 4" it will need a special coating which is very costy and the max temp the pipe will stand is about 120 degree Celsius which is not high enough.

My questions seems to be silly but what I mean is that now wen need a 26" ball valve full bore class 300 carbon steel what other specs considered important I should ask for?

The problem is that we have a firefighting network constructed of GRE pipes under ground and carbon steel pipes for above ground, the main problem happened in a 6" #150 riser which feeds the sprinkles the pipe started leaking water on the ground due to pin holes this riser has been in service...