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  • Users: awol
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  1. awol

    Hydrogen formation between carrier pipe and Type B sleeve

    thread338-343286 Earlier post asked the question. Since that post a reference to this issue was located. EXTERNAL CORROSION DIRECT ASSESSMENT FOR UNIQUE THREATS TO UNDERGROUND PIPELINES. CONTRACT NO. DTPH56-06-T-0012, Report to PHMSA from CC Technologies in 2007. Page 42 illustrates the...
  2. awol

    Hydrogen H2 under Type B steel repair sleeve - pipeline - Cathodic Protection CP

    Has anyone experienced the development of hydrogen between the carrier pipe and the fully welded Type B steel repair sleeve? With enough hydrogen produced to dent the carrier pipe due to a thicker steel sleeve? Can an overdriven CP system produce hydrogen from the carrier pipe under a steel...
  3. awol

    ILI tools used in no flow pipelines - crawlers, self propelled

    I am interested in success stories from operators or service providers who have used ILI Tools in pipelines with no flow. The pipelines needing the inspection are 15 miles long and 20 miles long. Relatively flat elevation. Pipelines are full of petroleum liquid and no pressure. Would like...
  4. awol

    Allowable Plate Material for Steel Repair Sleeves

    A pipeline under the regulation of DOT 195 PHMSA and ASME B31.4 can be repaired using Type A and Type B Steel repair sleeves. I am looking for the type and grade of steel plate allowed as specified in the PHMSA, ASME, or possibly the API code. Knowing the Type A sleeve is considered a...
  5. awol

    use of Williams-Landel-Ferry equation with Viton

    I have a pressure test at temperature to validate an assembly. the assembly uses both a Viton material and a fluorogreen material , depending on the temperature. Normally we test at temperature and pressure and hold for twice the working time ( usually 72 hours working time). I would like to...
  6. awol

    seal testing

    I am familar with how and why metallic components used for containing pressure are testing to 1.25, 1.5, or twice the working pressure. When specifically testing a mechanical seal or elastomer design, at what pressure above working is the seal testing and how long is the test pressure applied...
  7. awol

    control of flash rusting

    We have a large area of carbon steel to clean down to bare metal. Due to conditions, we will be removing scale, rust, and coating to bare steel and then wait up to a week to apply the coating. Conditions are damp and cold , no sunlight. Is there a temp coating/ application I can use to...
  8. awol

    UV rating of an epoxy coating?

    Is there a standard test to rate the performace of an epoxy coating that is designed to be a UV protection coating? I found companies that rate their own coating as " good UV protection" but what does that mean? We use a coating as a sacrificial part of the system and it contains pigments to...
  9. awol

    Guidelines for hot rolling cylinders

    Is there a published guideline for preheat and maintaining heat during the hot-rolling process of steel plate based upon plate thickness? We are switching from cold rolling to hot rolling of A516 Gr 70 and need a starting place for the temperature we should maintain during the hot rolling...
  10. awol

    Threaded hardware used at diver depths

    What is the preferred coating for threaded fasteners used in seawater at depths where divers work? No ROVs. Have used Teflon coated fasteners (nuts, studs) but some speculate that the Teflon coating is damaged as torque is applied. Nitriding the hardware has been suggested but not confirmed...
  11. awol

    Conductivity on a buried pipeline

    We have applied an insulator to a buried pipeline and are in the process of validating the effectiveness of the insulator. The insulator isolates a bolt-on sleeve from the pipline. One engineer used an ohm meter and measures resistance. Any resistance reading is considered a failed validation...
  12. awol

    Repair of compression molded rubber

    We have nitrile and neoprene parts compression molded under high pressure. Once the rubber product is complete, we machine parts of the molded rubber part to various configurations. Sometimes voids below the surface are discovered during the machining process. Most of the time these voids do not...
  13. awol

    measure fabric thickness molded into rubber

    How can I measure a thick (.25") layer section of fabric that is molded completely in rubber? Though about laying a piece of steel wire cloth down first and then on the back side of the fabric section. Then mold all inside the rubber. Rather not have a metallic insert. Is there industrial...
  14. awol

    Inspect surface roughness finish at high temperature

    We have been using the Testex tape and dial indicator to measure and validate the surface roughness of steel. The Testex tape has a maximum working temperature of 150F and we need to measure the surface roughness on a slightly curved surface at temperatures of 300 F. If I use a thin aluminum...
  15. awol

    Corrosion under carbon fiber composite

    We are reinforcing a steel plate with a wet-applied carbon fiber composite. The bare steel is primed with epoxy primer. The carbon fabric (PAN) is wetted with an epoxy and, while the primer is still wet and uncured, the wet carbon is layed over the steel. Several layer are used, all wet when...
  16. awol

    Codes and Standards that govern Offshore Platforms

    Can someone explain the standards and codes that influence the operation of offshore Platforms? I am introducing a new product to the offshore platform business and need to know if DNV or ABS certification (or both) is required for this product. I have been told DNV affects certain sections...
  17. awol

    Pipe Threads NPT versus ANPT

    Using the standards ASME B1.20.1 for National Pipe Taper (NPT) threads and SAE AS71051 for Aeronautical National Pipe Taper (ANPT) threads, is it practical to manufacture NPT threads and check them as ANPT threads? Can NPT and ANPT L1, L2, and six-step gages be interchanged or must they be used...
  18. awol

    Annual pipeline pressure cycles

    I am trying to get an idea on how many pressure cycles a pipeline will experience during an average year. Both liquid and gas pipelines, both transmission and distribution. Not as much piping in a refinery. Who collects this type of data and is it public knowledge? I could poll a few pipeline...
  19. awol

    Inclusions in casting A216 WCC vs 8620 pressure vessel

    I have a pressure vessel housing cast with A216 WCC material. Experiencing a lot of inclusions exposed during machining. Foundry wants to change material to 8620 but I cannot verify this 8620 material is pressure quality. This part has internal and external threads so stainless is not an...
  20. awol

    Keyway design - method to retain steel key

    We broach a keyway into an ID of a shaft and silver solder the key in place. Low temp silver solder due to the material. Although not recommended, the parts are assembled in the field using excessive force (hammers) and the solder cannot hold the key. I have investigated epoxy for more...

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