The designation has come through a list of valves required for a power station in the far east which is being engineered out of Japan. Under the valve rating we have some items which state the following notation;- 1500LB-Ⅱ.
I cam across this designation for valve flange and was unsure as to what the II referred to.
Is it too simplistic to assume it refers to ASME II for the materials of construction.
Any assistance is much appreciated.
I managed to find the information I required which is as follows: -
ISO 3651-2A
Sensitized @ 700C for 30 mins.
20 Hours in boiling Copper Sulphate solution - (100g CuSO4/100mls H2SO4/700mls Water) - Made up to 1000mls with distiller Water
Examine @ x10 after bending through >90 degrees 1T...
Does anyone know the key differences,if any, between ASTM A262 Practise E and ISO 3651 Method 2A. Both are classed as Strauss tests and utilise CuSO4 and H2SO4 in the test solution but I am not sure if the concentrations are the same or if the immersion temperatures are the same.
Eric,
It really depends on the design and the problem areas are the stem and trunnion bores. On smaller valves these diameters can be quite small and require specialised welding equipment for accessing the bores. You could sleeve these bores wtih CRA and then weld into place which would allow...
MetalGuy10,
I am a bit intrigued as to why you would be interested in the corrosion resistance of 9Cr1Mo. This material is principally used in the power generation industry because of its improved creep resistance over conventional austenitic and martensitic steels at specific temperatures...
Zorans,
A few comments which may not help you in this instance but should assist in the future.
1/ If you are purchasing a metal seated ball valve and it is intended for gas service then you should add additonal test requirements to your purchase specification so that the valve manufacturer...
Eric,
Based on my experience, there is a cost justification for CS valves clad with CRA against solid stainless steel or Ni Alloy valves. The exact size when this becomes economical really depends on the valve design and on the internal processes that are involved. Bearing in mind that for clad...
Thank you Metengr,
The original WPS was qualified to ASME IX.
We machine the Inconel 625 and perform Dye Pen, prior to applying the Stellite.
I will double check on the welding parameters and butter layer thickness and revert.
Regards
I am currently applying stellite 6 onto cast monel 400 (ASTM A494-M35-1) using PTA and normally use an Inconel 625 buttering layer. The prequlualified procedure has worked well in the past however, current production tests are showing intergranular cracking in the Monel / Inconel HAZ, but only...
kawliga,
There is a book called Stahlschlussel which lists DIN and ASTM equivalents. This is available to buy on the internet or if your query is only one or two materials then post them and I will check them out to see what equivalents are available.
If delivery is an issue then you should be able to get valves of this size and materials ex stock from Score Europe in Peterhead. The price will obviously be higher than from the manufacturer but the delivery will be days rather than months.
Danice,
To add to the info provided by hydromech....
It is customary to use plastic inserts in the mating faces of the body on low pressure floating ball valves. In these designs the main seat which contacts the ball is also a sold plastc insert and I assume it is not this aspect of the design...
Rad,
There is book called Stahlstusshel (probably not the correct spelling) which covers the conversion of many steels e.g. ASTM, BS etc with the German equivalent.
I am out of office for another week but when I return I could provide you with more details.
Kritter,
My experience of E-Nickel is as a manufacturer supplying to the Oil & Gas industry.
Standard in O&G is >10% P for corrosion resistance based on work done by Shell. <10% the coating was generally used for mild wear resistance.
Thicknesses in O&G vary but for corrosion resistance...
A few thoughts from a manufacturer
Manufacturers who have quoted a standard design have assumed that the valve will not be operated at the design temperature. e.g. operated from close to open and the pressure allowed to drop with resultant drop in temperature. The valve will then not be...
