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Material Selection for Oil and Gas Material 3

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Introduction

Question 8 Select a list of materials to fabricate a 2 m diameter by 4 m tall pressure vessel to be used in a processing stream in the Syncrude plant. The operating parameters are such that the environment is acidic, pH=4, there is a presence of oxygen and the tank contains a brine comprised of sulphate ions and bicarbonate ions. It operates under constant pressure and at a temperature of 45oC. Solution For this question, safety criteria for this very critical because of the high human risk involved. The following conditions should be used: ?f ? 0.20 KIC ? 120 MPaVm We made the following assumptions: Constant well pressure of 2500 kPa Constant temperature of 45oC Thickness of pressure vessel is 2.5cm. Diameter of vessel is 50 cm Hoop Stress We must calculate the hoop stress to get a better understanding of the internal pressure. We used the following to calculate this: For the considerations, we have stated the primary, secondary, and other considerations: Consideration Criteria Primary Yield Strength () required for the hoop stress and fatigue Secondary Corrosion because of the low pH value caused by brine and other acids; SCC due to the corrosive substances and high pressures; Formability to allow for ease of fabrication of material; Creep Resistance because of constant pressure and temperature; Other Weldability is also an important factor because pressure vessels are welded to attach together and the nipples, gauges, pipe extensions, flanges etc. ...read more.

Middle

However, we did not have enough information to create accurate and valid charts. Therefore, using the Carbon Content for each metal type we created the following Steel For this technique, we plotted the Carbon percentage with the thermal conductivity for plain Steels.. From this we developed an equation which will give us our value for K according to carbon percentage: Equation of Steel Graph: K = -3.7039(Wt%Carbon) + 52.013 Stainless Steel For this technique, we plotted the Carbon percentage with the thermal conductivity for Steels Alloys. From this we developed an equation which will give us our value for K according to carbon percentage: Equation of Steel Alloys Graph: K = 36.933(Wt% Carbon) + 20.564 Austenitic Steel For this technique, we plotted the Carbon percentage with the thermal conductivity for Austenitic Alloys. From this we developed an equation which will give us our value for K according to carbon percentage: Equation of Steel Alloys Graph: K = 32.5(Wt% Carbon) + 13.65 Question 10 A copy of a new NACE standard MR0175 is found on in the reading resource room. Summarize the important points that you need to use or consider when using this standard for selecting materials for a sour service application. Solution: NACE MR0175 or Application concerning sour oil and gas handbook contain the following information and considerations. ...read more.

Conclusion

are the most common materials for springs. Stainless steel is also common. Other metals include beryllium copper alloy, phosphor bronze, and titanium. Material ?y (Mpa) ?u (Mpa) ?e (Mpa) ?f (%) E (Gpa) Density g/cc Scaling Temp (oC) UR (Mpa) CCR (UR*?e) Rank Stainless Steel AISI 302 1200 1500 420 0.14 180 7.9 250 4000 1680000 7 AISI 304 215 505 75.25 0.16 200 8 850 115.5625 8696 4 AISI 316 290 580 101.5 0.15 193 8 870 217.8756477 22114 2 Steel 0 AISI 5160 Annealed 275 724 96.25 0.17 205 7.85 855 184.4512195 17753 3 AISI 5160 Normalized 530 958 185.5 0.17 205 7.85 855 685.1219512 127090 1 AISI 5160 Oil Q&T 540C 1005 1145 351.75 0.14 205 7.85 855 2463.47561 866528 8 Copper Annealed 33.3 210 11.655 110 8.96 400 5.040409091 59 6 Titanium 140 220 49 0.25 116 4.5 800 84.48275862 4140 5 We have compiled a list and ranked them in order via, CCR. We were unable to find the values for some of the metals/alloys, so we left them out. From the above table, we can see that AISI 302 and AISI 5160 Oil Q&T 540C have the best CCR. However, AISI 302 does not pass the Scaling Temperature Criteria of 340oC. AISI 5160 Q&T does not live up to the ductility Criteria. Therefore, we are left with the rest of the materials. The CCR clearly shows hat AISI 5160 is the best metal to use. ...read more.

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