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  1. bogiedreamer

    Best coating/finish on Aluminum valves for LOX/Nitrogen/Helium service at Cryogenic Temperatures

    We are having many issues with valves that perform well at ambient but then leak at Cryogenic temperatures. We have done things like: 1. Use heavy spring PTFE jacket seals 2. Achieve surface finish of 4 Ra uin on both the gland ID and gland OD 3. Use Krytox grease I think the problem is at...
  2. bogiedreamer

    Definitition of full hard, half hard and 40% cold reduced

    Full hard - strip is rolled to half of the original thickness Half hard - ? 40% cold reduced - ? How do you calculate the original thickness for half hard and 40% cold reduced? I thought I could find any definition online but I am not able to.
  3. bogiedreamer

    helium/LOX valve that is leaking - Anodized Aluminum housing is the problem?

    We have a helium/LOX valve that is leaking even with heavy spring PTFE seals. The valve finish is hard anodized aluminum and even with a 4 Ra finish, leakage is higher than desirable. Can we apply some type of second coating to reduce this leakage? Something to fill up the deep pores in the...
  4. bogiedreamer

    Second coating on Hard Anodized Aluminum - sealing helium

    We have a helium/LOX valve that is leaking even with heavy spring PTFE seals. The valve finish is hard anodized aluminum and even with a 4 Ra finish, leakage is higher than desirable. Can we apply some type of second coating to reduce this leakage? Something to fill up the deep pores in the...
  5. bogiedreamer

    API15 C203601 - Requirements

    Anyone familiar with API15 C203601 requirements? We sells spring energized PTFE seals and now our customer is asking us if our seals meet this requirements and we don't know. I can't even find a place to purchase this document. Can anyone help?
  6. bogiedreamer

    Elgiloy vs. Inconel 718 for 17% H2S service,

    I have two spring materials to choose from for use in a spring energized seal but not sure if Elgiloy or Inconel 718 will be better in term of better resistance to corrosion because of the present of H2S at 17% conc. Could you please give some advice? If possible, please include source of...
  7. bogiedreamer

    Charger compatibility for 12 V 8Ah Lead Acid Battery

    Hi, I have a 12V 8Ah Lead Acid Battery. I bought a 12V charger that was on Sale but I am not sure if they are compatible. The Charger indicates: "High Performance Ni-cd Battery Charger" Input: AC 117V 60 Hz Output: DC 12V 6W 600mA Thanks,
  8. bogiedreamer

    Radiation unit converstion

    What is 1x10^5Gy/40year in rads? thanks,
  9. bogiedreamer

    Shell MESC SPE 77/312 vs ISO 15848-1 Class B for Low Fugitive Emission

    Shell MESC SPE 77/312 vs ISO 15848-1 Class B Are these specs comparable? Which is more stringent? Thanks,
  10. bogiedreamer

    Plastic Strain Data for Steel and PTFE

    Is there a material data library in Abaqus? I need plastic strain data for Steel and PTFE. I found this steel data from an Abaqus tutorial from a University, could anyone verify that it is correct? *ELASTIC 210.E09, 0.31 *PLASTIC 200.2E06, 0.0 246.0E06, 0.0235 294.0E06, 0.0474 374.0E06...
  11. bogiedreamer

    First attempt at material nonlinearity, problem with plastic region

    Hi all, I finally got my model of helical spring compression to run. Initially to keep the model simple, I define only E = 29,000,000 psi and PR = 0.3. The result seems a little high especially at the toward the end with larger compression (see attached graph). Then I attempted to define...
  12. bogiedreamer

    EDPM O-ring, what to use for Young's Modulus and Poisson's Ratio

    I need to perform an analysis to estimate the compression force of an O-ring. I know that a non-linear analysis is better but I think 20% compression of an o-ring is not too bad and I just need an approximation of the compression force. My question is can I use the Flexural Modulus of EPDM as...
  13. bogiedreamer

    Missing rigid plates when run, result seems correct

    Hi, My model simulates two rigid plates compressing a helical coil spring. However, I don't see the two plates in the result, just a line. However, the result seems to be correct. What is wrong?
  14. bogiedreamer

    Output help, Reaction force and stress

    My model is setup and ran but I have no clue how to get the right output. Please see that attached image. I need to get the reaction force and node with highest stress. Also, this might be a stupid question but what is the difference between History Output Request and Field Output Request...
  15. bogiedreamer

    Abaqus, pressure load pointing in various direction

    I have an axissymmetric model with the pressure energizing the cavity of a u-cup seal. However, when I apply the pressure to the cavity of the seal, the pressure direction is pointing in both direction. Is this a problem?
  16. bogiedreamer

    Valves tutorials--where to find?

    I am new to Valves and need to know about the differences between various valve designs and when to use them. For example, when to use ball valve and when to use needle valve design. Thanks,
  17. bogiedreamer

    High Temperature Seat Seals for Ball Valves

    For ball valves, we usually use Spring Energized Teflon seals for the seat position for temperature range under 300C. But now we have an application where the fluid temperature can be 400C to 450C where Teflon will not work, what kind of seal should we use? thanks,
  18. bogiedreamer

    High Speed Bearing,

    Hi, I tried a Bronze filled PTFE bearing/wearring but because the speed is 600 FPM the bearing lasted only 15 minutes. The PTFE basically melted and disappeared leaving only the bronze behind. What bearing material should I try? Shaft is 3.5 inch in diameter, bearing cross-section is .100"...
  19. bogiedreamer

    Reaction Force on Rod, Need Urgen Help

    Hi, I completed an analysis of a U-CUP seal installed into a gland (thus it is compressed by the rod and bore). But I am self-taught and really weak on the Result and Visualization part so could you please help me find out the Reaction force on the rod? I have attached the cae file along with...
  20. bogiedreamer

    What is wrong with my model--helical spring compressed by rigid plates

    Hi, I created a model of a helical spring (5 coils) being compressed a two rigid plates. It didn't converge. Could any one please take a look at the file and show me what is wrong? Many thanks,

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