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  1. EngineerPhil

    O-ring contact stress v's fluid pressure

    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...
  2. EngineerPhil

    Clear plastic tube

    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...
  3. EngineerPhil

    AISI 4145 at temp

    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...
  4. EngineerPhil

    Temp and H2 Embrittlement

    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...
  5. EngineerPhil

    Effect of mass on stub acme thread?

    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...
  6. EngineerPhil

    copy SW parts, assemblies and drawing files

    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...
  7. EngineerPhil

    best practice

    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...
  8. EngineerPhil

    Using parts to cut other parts

    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.
  9. EngineerPhil

    pressure and temperature

    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...
  10. EngineerPhil

    Large thread data

    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...
  11. EngineerPhil

    Different thread strengths

    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...
  12. EngineerPhil

    Piston cup seal design

    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.
  13. EngineerPhil

    Chemical to de-bond rubber to metal components

    I would like to know if there is a suitable chemical (or better process) for reclaiming bonded rubber to metal parts. The rubber is often a nitrile or something similar (synthetic) and our cutrrent burning process is timely and bad for everyone's health. There is also the risk of effecting the...
  14. EngineerPhil

    Cross reference of American tool steels

    Can anyone provide me with a British or European equivalent tool steel specification for WS305-S4 and API P110. I have no idea what type of steel WS305-S4 or API P110 is. All I have managed to find from our supplier is that it is a tool steel, American and chisels are often made out of it...

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