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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
