Eng-Tips is the largest forum for Engineering Professionals on the Internet.

Members share and learn making Eng-Tips Forums the best source of engineering information on the Internet!

Register Log in
  • Congratulations JStephen 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: *

  • Users: NovaStark
  • Content: Threads
  • Order by date
  1. NovaStark

    PCC-2 Fillet Patches Clarifications

    Hello All, I am currently looking into the design of a fillet welded patch as per PCC-2 Article 212 due to external corrosion (local thin area) on a pressure vessel (designed to 2.2 MPa @ 180 degC with SA-516 Gr.60 material equivalent). As the vessel is designed to PD 5500, the minimum...
  2. NovaStark

    API 579 Part 9 FFS on thru-wall crack on piping

    Hello all, I am currently trying to perform a level 1 assessment on a though wall crack with dimensions a = 0.28 (wall thickness) and 2c = 0.75 inches within the parent metal. The current piping dimensions are 6 NPS Std wall with design conditions of 50 psig @ 400F. From 579, the 1-t curve...
  3. NovaStark

    Piping Exposed to slightly higher design temperature

    Hello all, Currently at my site, we have some piping that is designed to 1100 psig and 650 degF. However due to operating issues, the piping has been exposed to 900 psig (normal operating) and 670-690 degF (max). From my basic check, thickness is sufficient for the elevated temperature...
  4. NovaStark

    Relationship between pump discharge piping length and pump flow

    Good day all, I am trying to find any information I can on how the length of piping of a pump's discharge affects its performance/operation. Consider a single stage OH type pump which takes atmospheric hydraulic oil and pumps it to a compressor at 180 psi. Suction enters the pump horizontally...
  5. NovaStark

    Clarification on interpretation of pressure/temperature excursions (para 302.2.4)

    Good day all, I have been looking through some of the threads related to this paragraph as stated in ASME B31.3 for pressure & temperature variations in process piping: Thus say I have a piping system of design conditions 1,000 psig @ 500 degF (A106 Gr.B). For pressure rating, I assume this...
  6. NovaStark

    Temperature with no flow (static temperature?)

    Good day all, I am trying to get a different opinion on how temperature varies when there is no flow. I have a vessel operating at about 500 psig and 700F with only one outlet (about 25 in. line - insulated). About 4-5 feet away from the outlet flange there is a 4 inch take off that just ends...
  7. NovaStark

    HP Steam Inlet Line - high nozzle loads

    Good day all, I am trying to practice my modeling skills with C2 so I am trying an HP Steam Turbine inlet line made from A 335 P11 and design conditions of 2000 psig at 950F. I modeled everything as per isometric (including the actual installed hanger data) up to a termination point where...
  8. NovaStark

    Small pump with constant failures

    Hi, For the past few years I have had a pump that has now reached on a run until failure type status. It is used to pump NaOCl into sea water as treatment. Typically what happens is that a new pump is installed and after about a month or so, the vibration starts to increase until after about 6...
  9. NovaStark

    Fitness for service based on minimum thickness

    Hello all, I recently took some UT thickness measurements on a water storage tank made up of 1 shell course with a 25 ft diameter (designed to API 650). Based on the measurements, all the lowest readings were obtained in the liquid level region as expected. So when reviewing against the nominal...
  10. NovaStark

    Design validation of rectangular tank using asme

    Good day all, I currently have a rectangular tank that I would like to validate the design for. It is open to atmosphere so no high pressures. Because it isn't a circular tank I can't use API 650 and the pressure/temps are too low to fall into an ASME vessel I believe. Would simple engineering...
  11. NovaStark

    Damage to HX with sudden loss of flow

    Hi all, I am trying to quantify the effect on a kettle type heat exchanger in the event that it loses shell side flow and if I need a device to ensure a minimum flow to the shell side. So the details are as follows: Tube Side: This side cools hydrogen gas from around 100F to 40F at about...
  12. NovaStark

    Selection of branch fitting

    According to ASME B31.3, a fitting can be chosen from other standards such as MSS SP-97. However these don't go into detail about the actual selection process. For example, when would one just opt for weldolet instead of a sweepolet connection ? If it is simply up to the designer, what factors...
  13. NovaStark

    Weld strength reduction factor difference in thickness equations

    Hi all, The facility that I work in was constructed using the B31.3 2004 edition. So piping minimum thicknesses are calculated using this edition. Have used the 2008 edition and beyond, I saw that the W factor was introduced in 2004 however only one of the thickness equations whilst from 2006...
  14. NovaStark

    Lifting a pipe for quick repair of support

    Hi all, I currently have a steam piping in-service which appears to have a pipe support resting on top of a guide support and has bent one of the guides. Now the pipe carries steam at around 750 psi at 700 degF. Likely what happened is that during start up and shutdown there was undesirable...
  15. NovaStark

    Tmin for elbows for B31.3

    B31.3 has the formulas for determining tmin for straight pipe and elbows based on internal pressure. From some of my calculations based on the code, the tmin for bends will be thicker than straight pipe. Does that mean when creating a material specification, one would select a pipe schedule...
  16. NovaStark

    B31,3 missing pipe spec?

    Good day all, I currently have a piping specification which calls out for material of SA-358 304H Cl.1 at 850 degF. In trying to calculate the minimum thickness using B31.3, I am not finding this material in the allowable stresses section. Checking ASME Sec. 2D, I find the material however it...
  17. NovaStark

    Once off software for electronic mechanical engineering tools

    Hi all, I've been looking to see if there are any non-license required software that can help me in my job. For example, perhaps some program that has all of ASME B16.5 and similar dimensions, pipe dimensions, ASME II-D etc. The closest I've found is Abuden Toolbox but that I could only find...
  18. NovaStark

    HX tube min thickness

    Good day all, Currently I have a heat exchanger which heats incoming air (via straight finned tubes) using steam. Tubeside on steam, and air on the shellside. Looking at the design code, it is designed to ASME 8 Div.1 for which the tube is specified as 1 inch and 1/16" thick. Now for the...
  19. NovaStark

    PVs exposed to temporary sudden increases in pressure

    Typically a PV will be designed to a fixed design pressure and temperature which is used to determine thicknesses and so on. However is there a way to quantify what effect a sudden increase in pressure (still below design) would have on a vessel? For example, say a vessel is designed to 700...
  20. NovaStark

    Effect of DP on PVs

    Most heat exchangers or pressure vessels that I have come into contact with are design for either full shell and/or full tube side pressures. In the case of heat exchangers when fouling is concerned, can a high differential pressure damage tube-to-tubesheet joints or any other location? (By...

Part and Inventory Search

Back
Top