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  1. johnchrc

    O-Ring friction

    Why are you surprised with Peek Backups for Viton T-Seals? Temp range 275 and 350 F 3 seals see 2,000 psi DP 1 will potentially see 10,000 psi and it could e unloaded under pressure so I have a special PEEK backup/diffuser ring that will not allow pressure to unload inti t-seal is protected in...
  2. johnchrc

    Thread Class Compatibility for 3/4" UNF

    It was the coating combined with 3A class thread. Remove phosphate and nozzle threads on just fine. We have years worth of nozzles so I may have them coat the housings then tap the threads and apply kendex or some rust inhibitor that can be easily removed with solvent until we make new...
  3. johnchrc

    Thread Class Compatibility for 3/4" UNF

    We have a cylindrical housing with 16 3/4"-16 UNF 2B threaded holes. The housing and port are coated with manganese phosphate. A 3/4"-16 UNF 3A nozzle (pin) thread made with D2 Tool Steel and no coating is called out to make up into the hole. Our Supply Chain Manager says he is having hell...
  4. johnchrc

    Is there a Time Dependent Strain for material under constant stress at ambient temperature

    metenger, What would create a secondary stress during installation and storage? No disrespect I just don't follow. Part is collapsed and installed inside Sleeve where it remains until it is pressured to 900 psi and shifts open at which point it is no longer under stress or used again unless...
  5. johnchrc

    Is there a Time Dependent Strain for material under constant stress at ambient temperature

    Yes, I do have a small amount of plastic deformation. My calcs show the beam outer fiber is overstressed. We have been running these for at least two years but until we disassembled parts that were sitting in inventory outside to clean up we never discovered the problem. I can see if I can...
  6. johnchrc

    Is there a Time Dependent Strain for material under constant stress at ambient temperature

    Another pic to help convey situation. I just learned I could only place one attachment at a time. This just shows collet collapsed in Sleeve. - CJhttp://files.engineering.com/getfile.aspx?folder=42add681-50a8-4704-bb06-5cefa102b281&file=Collet_in_Assembly.JPG
  7. johnchrc

    Is there a Time Dependent Strain for material under constant stress at ambient temperature

    Correct Blueblood, If part is pulled immediately there may be some hysteresis from elastic yielding but this is the kind od reduction I'm seeing after 1 year+ 4.802/4/882 As machined 4.429 to 4.502 after pulling from 4.335 ID for ~1 year LPI shows cracks is QPQ surface that is 5-8 mil thick...
  8. johnchrc

    Is there a Time Dependent Strain for material under constant stress at ambient temperature

    Is there a time dependent strain condition when a material is under stress (alloy steel 4140 Q&T) that could cause permanent strain increase over time at ambient temperature? I have a collet that is collapsed into a sleeve ID under very high bending stress for the material. After 1 year the...
  9. johnchrc

    creating realistic bend or flex in hot worked collet finger

    We induction heat a Flex Seat so collet fingers are hot enough we can hot work to size. I don't know how to model this in Solidworks. I have attached a JPEG of a section view of the flex Seat. We don't even show it flared in our drawing. I want to draw this flared at fingers about their...
  10. johnchrc

    Shale Play and DP between Ball Drop Sleeve Groupings

    More info to go with initial question.... I guess I'm looking for a production or completions engineer who has experience with shale producers and knows what downhole producing and shut-in pressures are. The more examples of down hole well conditions after completing , the better...
  11. johnchrc

    Shale Play and DP between Ball Drop Sleeve Groupings

    If you had a well with 50 sleeves, 5 per zone and just fraced all of them and were ready to flow back but couldn't because of blockage in Sleeve 5 in first zone, what kind of pressure differential would you expect between zones? Say ball is jammed into a seat but will dissolve in 30 days. You...
  12. johnchrc

    Flaring EDM cut collats from cylinder without cold working or chnaging microstructure

    I want to use a press and flare collets out made from low alloy steel 110 MYS 36 RC 1250 tempering temperature. We are using a flaring mandrel at 100F below tempering temperature and holding until cools till about 900F or 13 minutes. Flared collets do not spring back. I want to try and do...
  13. johnchrc

    Double Start Stub Acme 10 TPI Threads with .2 lead - Differences in callout from single start thread

    Will the double start affect the thread strength or torque value of a single start thread? If the pitch is the same, it should not matter, right? It’s just two threads working together instead of one. Unless there is something I missed. A 10 TPI thread would have .1 pitch but .2 lead correct...
  14. johnchrc

    Cold water affects on Hydrostatic Testing of Static 300 Series FKM 90 Vacuum Gland Seals

    This does not include material deformation from FEA results which resulted in average of 9.6% squeeze at 15,000 psi. A loss of 5.4% of squeeze. Did not look at thermal contraction/expansion. I know it holds 10,000 psi and leaks above that. We have not been given chance to analyze this because...
  15. johnchrc

    Cold water affects on Hydrostatic Testing of Static 300 Series FKM 90 Vacuum Gland Seals

    It is a 349 90 duro Viton with PTFE Back-ups. Average squeeze is 15%. Static Seal. Has Xylan 1425 1 mil thick finish on ID land (included in dimension). Piston Seal Bore ID 4.965/4.970 Groove OD: 4.613/4.599 Piston OD: 4.960/4.965 .402 wide R.008 at shoulders and R.016 in corners ID under...
  16. johnchrc

    Cold water affects on Hydrostatic Testing of Static 300 Series FKM 90 Vacuum Gland Seals

    Two questions: 1) Could cold temperature fluid (40F vs. 80F) cause a std o-ring seal to leak after it has already energized and began holding pressure differential? I know it can cause problems achieving a seal because it becomes hard and loses elasticity. I have seen where we just warmed...
  17. johnchrc

    Spanner Wrench Pin Hole Sizes or shapes for 5-1/2 through 6-3/4 OD Capacity

    racookpe1978, what page was the 5/16" hole with 4-23/32 to 7-3/32 grip range? Thanks - CJ
  18. johnchrc

    thickness of butress thread

    Thickness (ID) is dependent on pipe weight and will be thinner at end because it is a tapered pipe joint. There is another API Spec for Gauging and Inspection of Threads that has the profile and dimensions you want to see. For 18-5/8 taper is 1" TPF on diameter, 5 TPI with .062 thd height...
  19. johnchrc

    Spanner Wrench Pin Hole Sizes or shapes for 5-1/2 through 6-3/4 OD Capacity

    I can find a Hook or Pin Height for subject. I don't know if it is a hook or pin and what diameter or width it is. MSC and Grainger just don't go into that detail for these larger Spanner Wrenches. Can anyone help direct me to a website that has the dimensions and where I could purchase the...
  20. johnchrc

    Recommended grease for straight threads (stub acme)

    Gear cutter, Do you know if these compounds contain lead? Are they compatible with HNBR AND VITON? - CJ

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