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Can anyone help? Is there a rule of thumb that roughly describes the relationship (for a seal to perform) between the contact sealing force/stress on the o-ring to the applied fluid pressure? I have a seal that doesn't always work and FEA suggests it does. If the applied fluid pressure is too...

I want to know if there is a clear plastic tube that is suitable for exposure to 160degsC. The ID needs to be 4" but the wall thickness is not important. It forms part of a test rig but will be backed up with a steel casing with slots so that we can see in. Would glass be an option - just...

I didn't think there would be any drop in physicals at this temp. To answer your questions metengr, 1) There is no specified heat treatment for this steel. It is machined from solid bar and used. The properties according to the material specs are yield 110k psi and strength 130k psi. 2) It...

I have two 4145 steel cans with an ID of 60mm and thickness 3mm in contact with each other on a shaft. There is a load and pressure from other components attached to either can but they (combined) fall short of the tensile or yield strength of the steel. These cans fail at temp of 200degs C...

Many thanks Kenvlach and ijzer, Perhaps I don't inderstand H-embrittlement completely. Kenvlach, the oil is quite safe up to 350°C and the hardness of the steel is typically 321-302 Brinell Hardness (HB) with a UTS of typically 145k psi but the spec says 4145 is really 135k psi. There is no...

I am wondering if there is a temperature at which H2 embrittlement starts? I have a vessel or test flat ened cylinder which I use to pressure test parts at ambient and at elevated temps. The material is phosphated AISI 4145 with a yield greater than 110k psi. There are no welds as the end...

Desertfox, Many thanks for your reply. The rig is part of a pressure test rig and these two parts are similar to a reducing coupler for a 3/4" BSP water fitting. But its not! That's why the materials are similar. We have actually managed to mate the parts horizontally. This was...

I am experiencing pick up or galling on the mating faces of a threaded male and female stub acme part. Both are AISI 4145 and phosphated. The thread is designated a 14.5" - 6- STUB ACME 2G thread. This is a nominal diam of 14.5" with 6 TPI. The female part is fixed level to the...

I have an assembly with two parts and two drawings. The drawings are related to one part and the assembly. All SW files. I want to "copy" these 4 files to another location on my server so that I can make minor mods to diameters etc without changing the original files. This is...

I am trying to determine what might be the best solidworks modelling practice. I have a product which in essence can be modelled as a 4 part asembly. I have used the answers from my previous thread to create cutting tools of each part so that they fit neatly together. I need to create...

Superb. Thanks DHALE1 and SharkMan. I thought Solidworks would allow you to it! I want associativity so I play with both ideas and see what works best. Thanks again. Phil.

Hello, I'm a recent purchaser of solidworks and have some questions. My VAR doesn't appear to that able to help hence this use of this site. Can you have two saved parts and use one to cut the other? If so how or is there a better way? Cheers Phil.

what is p? how do you account for different wire properties and hence expansion? Phil.

Deanc, Not building to any code. This is a vessel to test parts at temperature and under pressure. I am using a general non descriptive guide as I am not manufacturing the vessel for commercial purposes and am working within the pressure directive (UK) which allows "safe engineering...

Perhaps I am missing something. I'm redesigning a PV to take a MAWP of 14.5k psi and be little less than 10 liters in internal volume. The medium is hydraulic oil with a max temp of 300°C. If I want to test at this 14.5k psi at a temperature of 200°C, what should I consider in terms of...

I want to use a UNC thread for part of my design of a pressure test rig. I can not find any information on the internet or in Machinery's Handbook regarding thread sizes greater than 6 inch. I can't really use 6" as the OD of the pipe is 6.9" and I would loose to much strength by...

Many thanks CoryPad and Swertel, I have much reading and calculations to do. I think my initial calcs are also inappropriate. I have a tensile load on the thread of a solid shaft in excess of a million pounds. Too much I think. As a quick query, what is the logitudinal stress on a solid...

Hello, I'm trying to design a threaded part to a pressure vessel. The MAWP is 14.5k psi and the material has a yield of greater than 110k psi. Typically API P110. This is a casing grade. I have worked out the maximum stress on the mandrel (longitudinal stress due to pressue and the effects...

What things should I consider when designing a piston cup seal? Are there any books or web sites to start my design off on? Cheers Phil.

I have recently spent two weeks reviewing 3D CAD packages. I did not think ProE is best for our needs, Solidworks is cheaper and easier to use. (a 2 week break over Xmas was a good test as to how easy it was to pick something up again). I am not a CAD jockey but use it as a tool to design and...