Recent content by howkers

Occasionally our maintenance engineers report leakage in drips per minute. Fluid is water at various temperatures. I'm guessing the droplet size is related to viscosity and surface tension properties at different temperatures. Has anyone got a link to an estimate of typical water drop size at...

Sorry, wrong group - its not a pressure boundary application but part of a marine propulsion drive.

A colleague in Sweden is in the process of designing a new flange joint bolted together with bolts (M30 to M100). Current calculation methods within the department are 10+ years old and are limited to typically 45% of the yield stress of the bolt shank, this limitation is due to the stripping of...

The valve is supplied to us by a reputable valve manufacturer. We are back-fitting a safety justification. Thanks for the assistance.

Sorry forgot the outside diameter - 37.08mm. Not sure about the number of coils - the only drawing definition is ends closed and ground square. Ran parameters through http://www.efunda.com/DesignStandards/springs/calc_comp_Fstress.cfm which gave: load at closed position 96.5N and stress 411...

Valve is a check valve. Doesn't move very often. Spring parameters are: Free length 101.6mm Working length (closed valve) 53.82mm Working length (open) 30mm Solid length 26mm Wire diameter 2.84mm Spring rate 2.02 N/mm Material is a Monel alloy with UTS 1000 MPa and...

I was asked to check the torsional stress in the wire of a spring and plugged the numbers into the standard equation from the text books: shear stress = (8 x load x mean diameter x w-factor)/(pi x wire-diameter cubed) I was surprised to get a result which exceeded the shear ultimate stress for...

We manufacture nuclear valves to ASME III. Some of our older designs have surface finishes on internal surfaces of 16 micro inch, which is hard to achieve. It has been suggested that this was introduced to prevent cracking due to thermal shock and that this was derived from a requirement in ASME...

Initially gate valves and then other types.

I have a project to find reliability data for valves in nuclear power plants. Can anyone advise me of sources of such data. I have started to work through some of the sources listed in the following site: http://www.risoe.dk/rispubl/sys/ris-r-1235.htm Bill

I have a project to find reliability data for valves in nuclear power plants. Can anyone advise me of sources of such data. I have started to work through some of the sources listed in the following site: http://www.risoe.dk/rispubl/sys/ris-r-1235.htm Bill

I have a project to find reliability data for valves in nuclear power plants. Can anyone advise me of sources of such data. I have started to work throughsome of the sources listed in the following site: http://www.risoe.dk/rispubl/sys/ris-r-1235.htm Bill

One of my colleagues did his MSc dissertation on fire safety. He could find very little on nuclear power stations. Loads of stuff on railways and offshore oil platforms.

Metaaaal O-rings: Wills Rings of Somerset, now part of Shamban seals group. http://www.busakshamban.us/prod_global.htm?print=1&pid=359

I am having trouble with erosion damage to a relief valve pilot seat from wire drawing in a steam application. The Stellite 6 seat is tapered and gives contact at the top edge. The poppet is of Stellite 12 at slightly shallower angle, about 60 degrees inclusive. I have been advised that...