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  1. GL431

    Utilitities and 2/3 rule

    So often I come across heat exchangers in which the process side has a high design pressure and the utility side has a design pressure of 10 bar (150 psig). The utility side is often thermal oil or heating water. The process side invariably have operating pressures and therefore design pressures...
  2. GL431

    Induction Bends in 42" ASME B31.8 Pipeline

    Which standards actually apply for the dimensional tolerances of the OD at the ends of induction bends to be used in an ASME B 31.8 42" pipeline? API 5L (43rd ed.) table 8 gives tolerances for the OD of pipe-ends, which are quite tight. I can see that these tolerances ar fine for straight pipe...
  3. GL431

    RTJ Grooves corroding in wet CO2 environment

    The service is wet CO2 containing gas on oil field. Because of the pressure class, RTJs are chosen ahead of the compressor scrubbers as per piping code. Piping is SS and scrubber itself is CS. The ring gasket is SS. (Sequence: piping SS, Gasket ring SS, spacer, SS, gasket ring SS, vessel flange...
  4. GL431

    Natural Gas Cross Country Transmission Pipeline Depressuring

    Does anybody know of any real world data for the actual depressuring times (to atmosphere) for real natural gas transmission pipeline projects? ASME 31.4 846.21 c) calls for a blow down "as rapidly as practical". I was wondering what is achieved in practice, say for a 34" line operating at 45...
  5. GL431

    Heater for LPG Liquid

    It is late at night, eyes are getting heavy and I do not find anything on google. So I ask here. The problem is offloading of -42°C LPG from a marine tanker to onshore storage at 500 cubic meters per hour. The storage terminal will accept LPG liquid only with approx. 3°C. A heater against...
  6. GL431

    API 5B; tubing thread profile gauge

    Could anyone tell me how do I go about procuring a "tubing thread profile gauge" (template) like the one shown in API RP 5B1 Figure 63"? I have a problem in the field and need to do some measurements quickly.
  7. GL431

    Fired Heater Inspection - Sagging and Bowing of tubes

    This question pertains to the inspection of in-service fired heaters. Is bowing of tubes the same as sagging? API 573 mentions both terms, but mentions details only on sagging. The heater tubes we are looking at now are the vertical radiant tubes in a vertical cylindrical crude oil heater...
  8. GL431

    Standard for Diesel Motors in Hazardous Areas

    I have heard that there is a standard/guideline out there for the use of diesel motors in hazardous areas (e.g. drilling rigs). Does anybody know which one it is? Could be API, UK HSE, BS, EN or ISO.
  9. GL431

    API, ISO, EN ISO, DIN EN ISO Really the same?

    I suppose this is a "standard" type of question. I searched, got a number of hints, but not a definite answer. When two different standard authorities issue standards with the sentence "this standard is identical to ISO ..." are these standards really identical to each other? In my specific...
  10. GL431

    Inspection Techniques for GRP Piping in Services

    We operate some GRP piping in oil field service. The GRP is for handling of salt water as well as fresh water. We do not know of anything to look for by way of a structured inspection plan for this piping. I have enquired from a few manufacturers and contractors and the answer was unanimously...
  11. GL431

    Ageing Steel

    I have following situation (as an example): I have to evaluate the inlet an outlet boxes of an aircooler. Operating Pressure: 5.000 psig Operating Temp: 200°C Medium: Natural Gas with up to 10% H2S (presumably by volume) Operating time until now: 35 years. Right now I cannot say which steel was...
  12. GL431

    LPG cylinder PRV Capacity according to EN 13953

    I need to know what the design guideline is for specifying the capacity of LPG gas cylinder pressure relief valves (PRV integrated in self-closing cylinder valve). The guide line should hopefully be given in EN 13953. Unfortunately I currently do not have this standard and it will take a while...
  13. GL431

    NDE Methods for Insulated Plant Piping

    We have a 10" CS line carrying sweet wet natural gas with a significant concentration of CO2. The line is insulated and runs at an elevation of 5 to 6 meters on supports for approximately 400 meters. Significant corrosion is expected in this line, despite dosing of anti corrosion agent. We have...
  14. GL431

    Differences between JCO and UOE Line Pipe

    Does anyone know of a published study or paper which deals with the differences in quality control requirements and in field behaviour of line pipe manufactured by the JCO process on the one hand, and by the UOE process on the other hand? JCO - plates pressed in J form first, then in C form and...
  15. GL431

    Pipeline Anchor Block; Sand Compacting for Flowline Construction

    I have two questions which turned up during pipeline and flow line construction in desert sand locations. are there any code requirements (or firm guidelines) against fixing the pipe line to the anchor block flanges after three days of pouring the concrete anchor block? Normally one waits at...
  16. GL431

    European Recommended Practices for RBI (Risk Based Inspection)

    In preparation for an RBI programme for oil and gas pressure vessels and piping (oil field production environment), I would like to make a bibliography of the relevant codes, recommended practices, research papers, etc. While the American recommended practices are well known (API 580, API 581...
  17. GL431

    Electrostatic Desalter/dehydrator/coalescer isolation failure

    We used teflon isolators in our electrostatic crude oil desalter. We never had a failure before. However, due to good reported experience with cast resin isolators at other facilities, we changed from teflon to cast resin also in our facility. The cast resin isolators failed right after...

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