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Validating the mathematical model of the Fracture Failure Assessment Diagram (FAD)Validating the mathematical model of the Fracture Failure Assessment Diagram (FAD)
2315 PRAC III Investigation of Brittle Burst FAD
2315 PRAC III Investigation of Brittle Burst FAD
TensileTensile NACE ANACE A DCBDCB
Mini-PipeMini-PipeFull Size Pipe
Can we gather characterization test data on a pipe and input this information in the FAD equations and predicttubular Failure Pressure in an H2S Sour Environment?
Can we gather characterization test data on a pipe and input this information in the FAD equations and predicttubular Failure Pressure in an H2S Sour Environment?
HRCHRC CVNCVN
PRAC III : 3 Test Samples from One Pipe
AB TCII Premium Threads Applied
Heavy Duty End Caps with AB TCII
Premium ThreadsApplied to the Test Sample
With Make-up Torque Control
UT Inspection (2% calibration notch)
20%x0.010”x42” milled notchpasses thru min. wall at center20%x0.010”x42” milled notchpasses thru min. wall at center
54 in.54 in. 54 in.
Analysis fulfilled all API C110 chemical requirements.
PRAC III : 3 Test Samples from One Pipe
Test Samples Ready for Shipmen
Tiny Pipe Testing• The committee questioned the refresh rate of 3 times
a week. With a 7% NACE-A Solution the H2S depletion rate may require a much higher refresh frequency.
EDM OD NotchEDM OD Notch
~ 4 inches~ 4 inches
From: "Ellis, Peter F" <[email protected]>To: "[email protected]" <[email protected]>, Xin Long <[email protected]>, Date: 11/15/2012 06:16 PMSubject: Result of the Tiny pipe H2S Depletion Study.
Pete, Xin,On Tuesday, 11/13, we charged a fresh tiny pipe with NACE Solution D containing 85.15 ppm H2S and locked it in. We collected and the contents of the tiny pipe 4.05 hours later and measured an H2S concentration of 51.09 ppm, a decrease of 40% over 4 hours.
We then charged the same tiny pipe with NACE Solution A saturated with H2S for 17.72 hours.
The tiny pipe was flushed with distilled water and charged with NACE Solution D containing 170.3 ppm H2S. After 4.05 hours the H2S concentration was 68.12 ppm, a decrease of 60%.
We were not able to collect enough solution to measure both the H2S level and the pH.Peter F. Ellis IIEngineering Team Leader, CorrosionHoneywell Corrosion Solutions11201 Greens Crossing Blvd, Suite 700 Houston, TX 77067
H2S Depletion Test with 5% H2S NACE A Solution
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0 1 2 3 4 5 6Time (hours)
H2S
Con
cent
ratio
n (p
pm)
With 17 Hour Pre-soak in 100% NACE-A Solution60% Decrease In 4 hours
No Pre-soak40% Decrease In 4 hours
Load and ID Refresh Schedule
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time in Days
% K
limit
Inte
rnal
Pre
ssur
e
100%NACE-A
7%NACE-A
Proposed Tiny Pipe
In a 100% Saturated NACE-A Solution
What we need is Klimit for a 7% NACE-A Solution
Tenaris
