In a situation where the valve size, class and trim are the same why would I choose an expanding over a slab. Not talking about metal seated. when would you use a 600# expanding gate over a 600# slab gate, let's say both were PEEK seated for high temp.
I have assumed the expanding gate's...
Hi,
I have an engineer asking for large diameter 600# class CF8M API 600 gate valve. Service is Butane or Propane at -200 degrees. Valve will be operated annually during shutdown at which time the pipe would be drained downstream and removed thus exposing the downstream seat while upstream is...
A customer of mine wants some large bore API 6D slab gates, media is corrosive brackish water. The customer absolutely insists on RTFE seat inserts. Usually a 900# valve would come with Devlon seats, with PEEK being a more expensive alternative for the highest temperatures.
For whatever reason...
Hi fellas,
I have customers telling their slab pipeline gate valves must have 17-4PH stems insisting they perform far better than 316 stainless in environments where Hydrogen embrittlement can be an issue. I am not so sure that is the case and not looking to spend the extra money on stock when...
I'm trying to get a better understanding of the valve market for this type of drilling and recovery. Initially I assumed it would be alot of the same valves used in SAGD or steam injection but obviously there's no steam. Also curious what are the main materials and API trims for that service...
What is the proper procedure for performing API 598 low pressure (80 psi) on a gate valve using a test bench, the type that can turn the valve from vertical to horizontal for air test purpose. I've seen it done 2 ways
Example for a 6" 150# API 600
1. The valve is half open and clamped only on...
What are the differences? I know 608 only covers 150# and 300# and the wall thicknesses are the same. What other differences are there?
thanks in advance
Got a customer looking for the above. I assume it's a wellhead valve. Can't find specs or samples drawings for anything above 2 1/2". Any help? Want to make sure I'm not chasing a unicorn.
In my experience most low pressure applications request 2 piece floating ball valves and when not specified I've always sold the 2 piece floater. What instances would a 150# or 300# trunnion be the preferred design. Also what is the advantage of a 3 piece vs a 2 piece body?
Hey all,
I'm writing a corrective action report for a Type XI plate d failure. From looking at the picture in the book it seems that this failure is caused by the weld not being ground smooth after the weld is laid down. Is that correct? Or is it incomplete fusion? I really hate this spec, it's...
I supplied these valves to a company who now claims that they do not meet the NAVE MR107-2003 (not the combined ISO version). I believe that if they don't meet the spec the reason would be that a trim 12 valve cannot by nature meet that spec, and therefore they should have ordered something...
Howdy all,
I hear that there will be changes to the current spec. For the past years I've been getting valves produced to NACE MR1075 2003. I know that ISO 15156 is the equivalent, but now I hear there will be changes.
Does anyone know how significant these may be? or have a summary of the...
I have an old supplier that has been producing NACE MR0175 valves for a long time. Until now I had never known there were 2 different versions. If I am using WCB castings with API trim 12, what is different between the 2 versions?
I'm guessing it will have something to do the time or temp of...
I have a valve that failed an inspection due to a visual hot tear. The same valve passed RT. How is this possible?
Isn't a hot tear a crack but without separation? It's a dangerous failure and no doubt that it is a discontinuity and at any size needs repair, but how can it be seen if the metal...
Is anyone getting sand castings from overseas that pass SP55 visual on a regular basis without a ton of machining?
I've had alot of trouble getting "pretty" castings in China or India. It seems the solution is always grind, grind, grind. I know they do sand blasting but I do not know how much...
Howdy all,
According to B16.34 there are 3 tables that define an acceptable casting, the tables are divided up by wall thicknesses . I am required to meet is Table I-1 for valves under 2" thick (page 100 in 2004 version). The table specifies gas porosity up to level 2, sand level 3, CA...
I've got trouble with the solver topcoat I'm putting on my cast steel valves. Not surprisingly the chinese paint used there is crap and unless I give them direction who knows what I'll get.
There are 3 main problems.
1 - Fumes accumulate in the crates and after a month shipping opening fumes...
Is anyone familiar with this? I hear tell it is quite expensive. Is it or an equivalent witt the same properties (PH, heat, inconel, etc) available in china? Not so much looking for a cheap knock off, just for a source my supplier can get to use for installation. Of course less expensive wouldnt...
Do seat ring welding rods need to be pre-heated? I've been told that they do not. The supplier we use preheats the overlay rods but they told me that seat ring rods are always the same material which I believe is copper.
We are preparing for an API 600 monogram and I am not sure what this...
