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...
Thanks for the suggestion about LinkedIn. They are a good source of information. Correction on pressure. There will be about 400 psi pressure. The 16 inch pipeline is stagnate, no flow and full of hydrocarbons. Trying not to displace the liquid but leave it in place for now. Need to...
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...
On the teflon tape versus thread sealant, here is a suggestion. When NPT threads were created, the concept of make-and-break connections was not a consideration. NPT connections are intended to go together and stay together, as tightening can produce metal to metal sliding under mechanical...
Thanks Brimmer and for those who contacted me. Here is a good specification trail from DOT to ASME Sect II.
DOT 195.118 leads to ASME 16.9 Section 5 Materials leads to ASME Section II
and DOT 192.153(b) leads to ASME Section VIII, that leads to ASME Section II.
Other connections can reference...
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...
Fastest and cleanest method to repair local pitted pipe is a composite repair. Minimal training to install. Mostly designed for short section of pipe. Not intended for full stick lengths. Many suppliers to choose from.
We manufacture a face seal as part of a larger molded rubber component. Like the face seal on a set of glad hands used for pressure connections by the railroad. The face seals are placed under a clamp load and hold presure. How long is a reasonable time to hold test pressure in order 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...
Beeee Careful! At some point in this thread the asumption was made that a steel repair sleeve will have a similar thickness as a tapping tee. Tapping fittings are dimensioned to compensate for the material lost during the tap. These equations are code driven. Repair sleeves are used in a...
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...
There is a concern about placing a conductive (steel) part on a cathodically protected pipeline. Something about disrupting a balance and causing accelerated corrosion. Our clamp is wrapped and coated well and I don't anticipate a stand-alone corrosion issue with it. The pipeline owners are...
As always, great responses from all.
*Our final application will be on buried liquid and gas pipeline under pressure. Our test is on empty pipes in a lab (not buried). Our goal is to provide a steel repair clamp that is isolated from the pipe as not to affect any induced current or other...
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...
To ask a similar question, can A516 Gr 70 or A537 class 1 plate be considered a cold-weather steel? Will these materials have a charpy value at -50F? Thanks, Awol
