Thanks for the quick reply. The two flanges mate up fine in that the PSV flange is machined with the proper bolt holes, bolt circle, and raised face dimensions. My experience with cast components says that leaving heavier castings unmachined if it is not necessary is common. My client says...
I have a flange joint made up of a 4" Class 150 pipe flange connected to a pressure safety valve (PSV) inlet. The PSV comes standard with an as-cast Class 300 flange on its inlet. The manufacturer machines the inlet flange just enough to conform to the fit up requirements of the Class 150...
Unfortunately this installation is on an oil production ship called an FPSO and our client has not indicated any other use for the steam other than to provide us heat for our reboiler. I agree that in most cases flash steam can be utilized for other heating uses. They have really restricted...
I have been reading many threads on the subject of handling condensate from a reboiler. We are in discussions with our client and can't seem to come to any agreement. The problem is that my client's condensate return header operates at 90 degC and 1 bara. The condensate from our reboiler is...
My colleague and I are questioning the distance of a nozzel weld from a circumferential weld on a pressure vessel that meets ASME Section VIII requirements. I am sure that the welds cannot be too close together. We do not have a copy of Section VIII to check this vessel against. Can anyone...
Thank everyone for your replies so far. I see now that 316L is more corrosion resistant than plain 316.
The fluids we handle the most are lean amines (45%amine, 55% water), rich amines, containing H2S and CO2. I would assume that our clients are considering 316L to be better for this...
We are seeing specifications requiring 316L SST for machined parts in valves, etc., to be used in some corrosive services. We have, in the past, generally utilized only 316SST. There is no welding required for such parts. My questions addresses the difference in corrosion resistance between...
We have a need to procure manual ball valves, 2" through 10", Class 150, that meet the fugitive emissions requirements of ISO 15848-2, category B. The valves can be tested to either the ISO 15848-1 for type certification or production certified per ISO 15848-2.
Does anyone out there know of...
Our company currently utilizes a bare copper conductor running in an oil-filled pipe to route 20 kV AC voltage (1.0 amp) from a step up transformer to an electrostatic grid used for oil/water separation. We want to change this design to use an insulated conductor running in either conduit or a...
Is there a correlation between Shell's fugitive emission specification SPE77-300 and the ISO 15848-2? We are being asked to provide valves that meet the Table 1, Class B, and Table 2 emissions on a project. Several vendors are qualified to the above mentioned Shell standard.
Thanks, Stanier. I am currently taking a similar approach to what you suggested. The IEC 60534-8-3 gives an equation for the noise produced by an outlet expander fitted to the outlet of a valve. This equation includes the effects of the flow from the smaller inside diameter of the expander up...
I am looking for a method for calculating AERODYNAMIC noise generated in a pipe due to a restriction orifice. I am familiar with the IEC method for aerodynamic noise prediction in control valves and think some of the same principles might apply to an orifice. If one uses the same approach...
I appreciate the replies. I would like some additional insight on this issue.
I understand that the valve is the noise producer and the downstream piping is the component that radiates the sound energy into the nearby environment. The IEC equations are based upon a particular sensing point...
I have had many discussions concerning the prediction of valve noise using the current IEC 534-8-3 standard. My discussions usually involve how the actual configuration of the valve installation affects the theoretical Sound Pressure Level(SPL)produced by the equations in the IEC standard. The...
I have a philosophical discussion going concerning acceptable materials for pressure safety valves used in seawater. Our specifications require ALL Monel materials for the valves. These safety valves are low pressure units (ANSI Class 150, relief pressure 180 psig, 90 degF). The reason the...
Roy, Thanks for the prompt response. The area is hazardous, and the components, solenoid valve and limit switches, are all I.S. The GUAT would be a standard NEMA 7 box but I don't think that comes into play for I.S. construction; just mostly a robust electrical component.
I have a Westlock Quantum 3600 Series position switch box with pneumatic solenoid fitted to it. It is mounted to a ball valve actuator. This assembly is certified to ATEX EEx"i", instrinsically safe. Problem is that the box has only one cable entry hub. We have two cables routed to this...
It seems that this question concerning gland seal steam valves is not getting much response from the members' knowledge base. Perhaps someone knows about a text or handbook that might address this issue.
To Jim Casey: I have the Leslie application guides from way back and they do not go...
I would appreciate a quick tutorial on the functions of the control valves utilized for turbine gland seal steam control. These three valves are generally designated as: Boiler supply valve; cold reheat supply valve, and the spillover valve. I am particularly interested in the operation...
