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  1. JJAV1983

    AISC-Steel Construction manual - Table 7.1 Bolt Pre-tension vs Available tension

    AISC- Interpretation Hello All, I was hoping you could shed some light on this question regarding bolt pre-tension in AISC-Steel Construction manual - Table 7.1 If the required minimum Bolt Pre-tension for Pre-Installation Verification per Table 7.1 AISC Steel Construction Manual is = 37 kips...
  2. JJAV1983

    LATTICEWORK STEEL STRUCTURE - MAST

    Hello, I was hoping you can help me by letting me know under which standard the attached steel structure should be built under. The structure is made out of steel A500B. Thanks a lot, JJAV https://files.engineering.com/getfile.aspx?folder=049424f6-4c34-4eb0-9f8b-f952ca497163&file=13741.JPG
  3. JJAV1983

    #80-6 roller chain, drive sprocket running max. speed

    Hello, We just received a gearbox with a chain drive ratio of 4.73:1. On top of this GEARBOX, there is a 4-speed transmission and a hydraulic motor to drive it. One of the most common combinations RPM/torque in this GEARBOX is 781 RPM / 681 FT-LB TORQUE (gearbox output) The question is the...
  4. JJAV1983

    A135-A ELECTRIC RESISTANCE WELDED

    HI, I haven't seen that many many companies use A135-A pipe for pressure piping applications. However after going through all calculations as per B31.3, using that specific pipe falls under code. (maximum design pressure 350 PSI), is there anything so obvious that I am missing?
  5. JJAV1983

    Class 300 nipple (sched.80) Vs thickness calculation

    Hi, I was hoping to get some help here. A class 300 nipple (2 in sched. 80) I chose for my design (Class 300), is capable of holding 1500 psig of pressure from (-29 to 66 Celsius). However when I calculate this nipple as per B31.3 having into account: 12.5% under tolerance allowance, 0.118...
  6. JJAV1983

    Air/Water Manifold considered a pressure vessel?

    Hello, Would an air/water manifold subject to 350 psi of pressure considered a pressure vessel? Basically the system has four 2 in pipe inputs all connected to a common 4in output. Rough dimensions and sketch attached. If this is considered a pressure vessel? Under which code should it be...
  7. JJAV1983

    BUTT WELD TEE

    Hello, I was hoping you could answer this simple question. According to ASME B16.9-2003 for factory made wrought butt welding fittings, the allowable pressure may be calculated as for straight seamless pipe... So for example if the pressure rating for a 4" A53B pipe sched.40 is 2581 PSI (from...
  8. JJAV1983

    RACK AND PINION, HOW TO MAKE SURE THE SET IS GOING TO BE ENGAGED UNDER LOAD ?

    Hello All, Is there a way to calculate the maximum separation distance between rack and pinion under load? Total load on Rack: L= 85000 lb PD= 6.928 Pitch Diameter of Pinion No.Teeth=22 n= 6 number of pinions PA= 20 pressure angle ho= distance from back face to pitch line of rack = 2.81 in...
  9. JJAV1983

    Calculate max. allowable stress on a fillet weld in tension

    HI, What would be a quick way to verify the max. allowable stress in tension? The scenario is the following: A 3 in OD mechanical tubing joined to a 1 in thick plate, if I choose to have a 3/8 fillet weld all around the tube, what would be the max. allowable stress that this weld could tak...
  10. JJAV1983

    CIRCULAR / TOTAL RUNOUT EFFECT ON DIAMETER-SIZE

    Hope you can help me with this very simple question I think. I have a cylinder which OD.= 7.998+/- 0.001, if I want to stablish a total runout of .002", will this mean that the cylinder OD could be 8.001" if we take into account that the part was produced at 7.999" + .002" (runout)? Thank you...
  11. JJAV1983

    Hand Sketch P&ID, Hand sketch GA

    Hello, I was hoping I could get some help here. I run into a hand sketch exercise that I would like to compare. Here is the problem: Design a system with an inlet, discharge, and a method for monitoring pressure. Our client will install the system inline between their pump and injection...
  12. JJAV1983

    Metric tolerances in title block

    Hi, I recently started working for a new company, I noticed that the default metric title block we are using only has the specifie tolerance as follows: TOLERANCE +/- 0.1 (mm) All current and past drawings are dimensioned with 2 decimal places. So for example right now if we dimensioned the...
  13. JJAV1983

    Male Plastic Polycarbonate M4 insert wont fit in an M4 hole made on an Aluminum plate.

    How do I make sure that both parts are going to fit properly (loosely)? The call out for the insulator thread is: M4 x 0.7 - 6g. The assembler has to re-tap every single aluminium plate to be able to fit both parts. The call-out for the threaded hole is : M4 x 0.7 - 6H. Is there a way to...

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