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I agree with the 'Wetted' explanation as being the same as 'Exposed'

Isolate the Aluminium from the Galv structure with PTFE pads to eliminate any electrical difference at the joints (where the material will corrode) then connect your earthing strap (because you could end up with static) through a sacrificial anode i,e, lead.

A lot of valves being installed in this position are trunnion ball valves. Debris which may get trapped at the bottom of the gate can hold the gate off and stop full closure, this is not a problem with a ball valve. The other thing is you can readily fit a Partial Stroke Device - PSD, to a ball...

In addition to gerhrdl's 'Firesafe by construction' its also called 'Firesafe Design'

Subsea Actuator to Match - perhaps Ledeen

If its hydraulic testing your risk is low, if gas then just don't do it the Risk is too high.

Ask Dux about the Apache - North Sea application where they solved a major errosion problem.

I agree with terje61, if you go and specify a valve and its wrong it comes down to you, is the application your reading about 'EXACTLY' the same! Both the manufacturers and people on the plant know what works and what doesn't. Manufacturers have a wealth of experience built up over decades of...

What did the 'Certificate of Fire Approval' say about the standard it was performed too?

We changed our o rings out to graphite rings as the seal was static. Metal orings were just far too expensive to incorporate into the product. B

I can see why you are confused, valve manufacturers may have a design of valve which has been Fire Tested and is therefore 'Certified' Fire safe, whether by design or not, it holds a unique certificate for its BOM. A simple change in build i.e seat material, may then not have been tested(and...

Glass filled Torlon will abraid the o ring. B

What grade of 17.4ph are you using? I've used HH1150 for a number of years for shafts with high torque requirements within a cryogenic environment. We soaked every one of our components prior to installation. There always appeared to be less failure issues and better performance when doing...

Whilst I've made no reference to the melting point of PVC, I know it is low. My experience from firetesting Polymer seated valves as against lined would say that (size dependant, because a large body would not get to temperature in 1/2 hour) a 6 inch valve would last less than a rubber one, say...

NGL, I totally agree with what your saying. I always get the question when showing people aroung the cryo test facility - Why are you testing with the cold media on the outside when surely it is the inside which is being used.Plus the fact that ALL tests are done with Helium gas, where the valve...

Proving the design is going to be difficult and expensive for you if you have no Low Temp testing facility. whilst you may solve the customers problem with your valve now, what are the risks that the valve will actually have a very short life? What are the risks for failure? Why not as NGL says...

NGL, lets get back to your specifications BS6364 and Shell Mesc 77/306. These only allow you to immerse the valve so that the LIN is on the outside. I believe one reason for this is safety, plus testing valves using the LIN on the inside is not good bacause a cryogenic pump is required, possible...

An excert from the NACE web site reads -'NACE International was originally known as "The National Association of Corrosion Engineers" when it was established in 1943 by eleven corrosion engineers in the pipeline industry. These founding members were involved in a regional cathodic protection...

Also look at top of valve forum - FAQs.[Br BH

We manufacture valves for the North sea oil industry and get customers specifying that 'fire water' valves ie extunguisher water. should be of a certified fire safe build. Br B