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Hello All, I'm conducting a back-pressure test on a PSV fitted with bellows, testing at 30psi (air) as per ASME Viii. The valve manufacturer tag plate shows the set pressure of the valve, but also the back pressure, in this case 22psi for the latter. I’m assuming that the back pressure stated...

Hello All, I am calculating the allowable leakage for control valves using OEM stated Cv value that is a liquid coefficient. Using the liquid Cv value, this gives me the allowable leakage as per the specific gravity of the fluid (in this case water) How can you calculate the allowable leakage...

Hello everyone, Is it possible to carry out these welding operations when the materials are different? Im thinking of an application where i might want to weld HDPE and Glass Filled Nylon 66. Im trying to design a pipeline fitting that can be welded to a HDPE or PVC pipeline , the fitting...

Thankyou all for very useful input. If an integrity test is only carried out at 1barg for the bellows and the SRV is used on a system which generates a back pressure (for arguments sake) of 4 barg, then how would one know that the bellows are fit for purpose?

Hello all, What is regarded as a correct test pressure for bellows on PSV's. I have seen various valve service companies specify that they test bellows to 1BARG and 2BARG (depending on the company), these pressures are stipulated regardless of the set point of the valve and( as far as im...

Hell All, I am in the process of approving a 10" Dual plate check valve ANSI 1500LB with hubbed end connections. The specified design standard is API 594. I have a query related to the minimum wall thickness of the valve. I'm reading that the standard species this type of valve as having a...

Hello All, I am currently inspecting some valves that my company wishes to ship. They are JIS 16K rated globe valves. I have a few queries regarding the test pressure that would normally be used on this type of valve. The valves have been supplied with test certificates detailing that they...

Forgot to add the attachment! http://files.engineering.com/getfile.aspx?folder=0e43024a-c584-4df4-a6e5-c04cb34f4f1e&file=Pressure_temp_EN12266-1.JPG

Hello All, I'm after some help on how to interpret the test pressure calculation on EN 12266-1 I have a ANSI Class 600Lb valve that is A350 LF2 the customer has requested using EN 12266-1 as the test specification. How to do you go about calculating the test pressure as per the attached. From...

Hello All, Just after some general feedback on the supplementary test requirements in API 6D . I come across plenty of manufacturers who issue valves the type 2 low pressure seat test which is between 4.8-6.2 bar . The type 1 low pressure test would be between 0.5-1 Bar. Has anyone come across...

I had been delayed in replying as the manufacturer of the actuator had taken a while to get back to be with the material specification of the drive coupling. Material of the input drive is SS 2142 The material of the shaft is A182 F51 (Duplex) Outside diameter is 50 mm I haven't chose a key...

Thanks for the encouraging words zekeman! It most definitely isn’t Homework I can assure you that. It’s to do with my line of work. I am a Project Engineer. Being 2/3 rds of a complete engineer takes much more than just having a degree. But I do agree that I probably should be able to solve...

Hello All, I have a drive interface that i have attached in a drawing. The green component is a splined rotational drive shaft from a hydraulic actuator. This drives the silver shaft which is a valve. Ive been trying to get my head around FEA recently, but have come to the conclusion that it...

Hello all, I am reverse engineering a Choke valve plug and stem. The component in question has a solid Tungsten carbide tip(Plug) . Out of interest how is such a component manufactured as the rest of the stem is stainless steal. I have attached a picture for reference. I am considering having...

Thanks for all the replies! Some of the drawings need some editing (im not the technical authority) but they still need to be created, so scanning is unfortunately out of the window. I guess Auto Cad and Blocks is the way to go if that's software im comfortable with( im more comfortable with...

Hello All, What software is generally considered to be the best for drawing electrical circuits? I have been tasked with replicating a load of circuit drawings as the Digital copies have been lost/corrupt(I've attached a file for reference). I currently use Solid works for design work, and I...

Hello Everyone, Im currently working on sizing some control valves. They are anti-surge valves. Im trying get my head around the flow coefficient and what it exactly means. When valves are being sized you are normally given values of CgMin CgMax. I also see a Selected Cg value. What do these...

Hello all, I have a valve which has been cast out of 316 Stainless steel, because it is cast it becomes A351-CF8M. I need to connect to the valve with a pipe and Flange, but the materials I have for the pipe and flange are 316, will regular 316 be compatible with CF8M? ie can it be welded to...

Hello All, I am currently sizing a control valve for a gas application, I have the flow coefficients for the lower and upper bound cases, but I only have them in the unit of Cv . I need to convert theses values to Cg. C1= Cg /Cv . How can I calculate C1? And what variables do I need? Thanks...