Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. racookpe1978

    Ceiling fan issue

    Since it occurs when the fan is turned by hand, I would discount electrical or speed control interference or resonance. Gotta be mechanical/bearing problem.
  2. racookpe1978

    Vertical pipe support load

    1600 ft of vertical pipe (several hundred meters is not much information) yielding "only 5 tons" (now ANSI units ?). That dead load seems very, very low. What pipe material, wall thickness & schedule, and pipe diameter are you assuming?
  3. racookpe1978

    SpaceX Starship missions

    Working through launch of Nbr's IX and X missile. /Superbowl numerals
  4. racookpe1978

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    Yes, I read that report too. /color me very skeptical That "recovery" and rebuilding of a destroyer or cruiser-sized bow and ship's hull collapse is far, far faster than anything the US Navy salvage crews ever did in WWII, even later in the war when their drydocks and salvage teams had been...
  5. racookpe1978

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    And, a very rare! - accurate and descriptive video, of the different launch methods. But notice the shipyard crews cutting the restraints and the toggles or chain links. One failure on one cable? The crew is murdered. Or learns an expensive lesson.
  6. racookpe1978

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    This is a short video of a short (3-bogie) sideways launch success. The three frames released at the same time, all three frames slid downhill equally quickly, the load (the ship) was evenly balanced on the timbers above each frame, and it evenly floated (splashed) up off of the three roller...
  7. racookpe1978

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    Insane reaction by their government. "We goofed up. Hide the failure!" What in all bloody Hades "good" do those hundreds of blue tarps do towards recovery of the ship, of allowing partial salvage of the internals or of cutting up and moving the remains to begin building a new hull? Wait...
  8. racookpe1978

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    Stern launch ("Break the champagne bottle on the stem") creates the greatest stress on the hull girder as the stern begins to get bouyant, but the bow is only partially cradled by the forward half of the sliding ways. Launching is a tricky problem, aside from the "simple" weight and moment and...
  9. racookpe1978

    House Review - Site Visit without report?

    Also very relevant: If you do no report now, YOU have no realistic way of effectively charging (later) for your time when the report is needed. (Lawsuit, claim, liability, taxes, assessment or rebate or tax changes or loan or total collapse or insurance claim - whatever.) "Oh wait, I can get...
  10. racookpe1978

    Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok

    Penthouse - and its cover slab - had no sway bracing, no sideways resistance to anything but the falling rain. Not the cause, but probably symptomatic of the basic building design all around. Inside, the center was falling into itself as the upper fell as a complete "unit". Like the...
  11. racookpe1978

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    Details from the available British Commercial Press are few, and what is published contradicts itself. " In a statement KCNA said: 'Due to immature command and operational negligence, the parallel movement of the bogies could not be guaranteed, resulting in the launching sled in the stern...
  12. racookpe1978

    Slotted Counterbore

    A section view will also explicitly define which side the cut out is facing. So, when (not if) the mistake is made by production, you can point at the section view and show it to your boss.
  13. racookpe1978

    SpaceX Starship missions

    No. One Raptor engine (from an earlier test flight) was re-used in the booster that was recovered. The Upper Stage - the one that failed on the Jan 16 flight - was a revised design from a style used successfully before, but it (the upper stage) had not been flown as a unit before before. I...
  14. racookpe1978

    SpaceX Starship missions

    That debris field (Sept 2018) from the upper stage Unplanned Rapid Disassembly (Outside Operational Planned Scenario) Event is strikingly similar to the Jan 16 upper stage debris field photographed from below. Cue FAA hysteria and increased delays.
  15. racookpe1978

    NDT req for butt weld bottom plates where no annular plates small diameter API 650 tank .RT is required or Vacuum box testing is enough.

    What would you expect to learn from vacuum box testing? Only that no pin hole leaks exist through the weld? Dye pen test would tell you more actually. And then an RT. Why RT? Is the geometry unsuitable for UT? Oh, by the way. What material, what pressure, what fluid, what criteria...
  16. racookpe1978

    Interview help needed!

    We are now approaching 20 Dec, 30 days after this plea. (Robt wonders if the interview was successful in revealing the qualifications for a Senior Reliability Engineer at SpaceX.)
  17. racookpe1978

    Solar Gain Distortion

    Why is the "trailer skin (?) thermal expansion" causing instrument measurement difficulties? Seems the instrument would have to be mounted on shock-proof or very resilient mounts to avoid damage while the trailer is being pulled, when the trailer frame itself is bent and twisted loading and...
  18. racookpe1978

    Does the welder for Welding Process Qualification testing Be Qualified?

    On two levels, it can hardly be otherwise: A welder cannot "be qualified" on a WPS test weld if that WPS itself is not yet qualified. On the other hand, should YOU (your company) always chose your best welder (of those available) to make the certification welds for a new WPS? Your "best...
  19. racookpe1978

    suitable timing for post weld NDE

    Rational limits apply "first". Example: - Dye Pen exam or UT exam MUST WAIT until the weld zone has cooled down to near-room-temperature. The dye and UT lubricant/sound seal goop needs time on a relatively cool surface to soak, to not be burned off by a hot weld zone. - VT? Often, can be...
  20. racookpe1978

    Threaded Flange on 6" Pipe

    I regularly use 6 and even 8 inch NPT threaded fittings on temporary lube oil pipe assemblies for flush fittigns and lineups. But those are temporary use, low temperature (60 to 150 deg F) and low pressure assemblies. Every threaded fitting MUST BE allowed to be screwed tight, then not...

Part and Inventory Search

Back
Top