PV Elite 运行错误分析（有图有文件，唯求真相）

ming05130202 · 发表于 2013-12-9 21:11:28

1501.rar(36.35KB)
请求专家帮助答疑解惑，不胜感激。

    文件1501中的关于内压的错误
Element Thickness, Pressure, Diameter and Allowable Stress :

      | | Int. Press | Nominal | Total Corr| Element |  Allowable |
From| To | + Liq. Hd  |  Thickness | Allowance | Diameter |  Stress(SE)|
      | | MPa    |    mm    | mm    |    mm    | MPa    |
---------------------------------------------------------------------------
   10|  20|       ... |       ... |    ... |    2900.0 |       ... |
   20|  30|    7.5000 |       ... |    ... |    2900.0 |    115.15 |
   30|  40|    7.5000 |       ... |    ... |    2900.0 |    115.15 |
   40|  50|    7.5000 |       ... |    ... |    2900.0 |    115.15 |

Element Required Thickness and MAWP :

      | |    Design | M.A.W.P. |    M.A.P. | Minimum | Required |
From| To | Pressure |  Corroded  | New & Cold |  Thickness |  Thickness |
      | | MPa    | MPa    | MPa    |    mm    |    mm    |
----------------------------------------------------------------------------
   10|  20|       ... | No Calc | No Calc | 49.0000 | No Calc |
   20|  30| 7.50000 | 7.73007 | 7.73007 | 49.0000 | 47.5321 |
   30|  40| 7.50000 | 7.55234 | 7.55234 | 99.0000 | 98.2860 |
   40|  50| 7.50000 | 7.73007 | 7.73007 | 49.0000 | 47.5321 |
   Minimum                   7.552       7.552

MAWP: 7.552 MPa, limited by: Cylinder.

Internal Pressure Calculation Results :

ASME Code, Section VIII, Division 1, 2010, 2011a

Spherical Head From 20 To 30 SA-240 316L at 65  C

Longitudinal    Joint: Full Radiography per UW-11(a) Type 1
Circumferential Joint: Full Radiography per UW-11(a) Type 1

Material UNS Number: S31603

Required Thickness due to Internal Pressure [tr]:
= (P*R)/(2*S*E-0.2*P) per UG-27 (d)
= (7.500*1450.0000)/(2*115.15*1.00-0.2*7.500)
= 47.5321 + 0.0000 = 47.5321 mm

Max. Allowable Working Pressure at given Thickness, corroded [MAWP]:
= (2*S*E*t)/(R+0.2*t) per UG-27 (d)
= (2*115.15*1.00*49.0000)/(1450.0000+0.2*49.0000)
= 7.730 MPa

Maximum Allowable Pressure, New and Cold [MAPNC]:
= (2*S*E*t)/(R+0.2*t) per UG-27 (d)
= (2*115.15*1.00*49.0000)/(1450.0000+0.2*49.0000)
= 7.730 MPa

Actual stress at given pressure and thickness, corroded [Sact]:
= (P*(R + 0.2*t))/(2*E*t)
= (7.500*(1450.0000+0.2*49.0000))/(2*1.00*49.0000)
= 111.719 MPa

Percent Elongation per UHA-44  (75*tnom/Rf)*(1-Rf/Ro)  2.492 %
Note: Please Check Requirements of Table UHA-44 for Elongation limits.

SA-240 316L, Min Metal Temp without impact per UHA-51:  -196  C

Cylindrical Shell From 30 To 40 SA-240 316L at 65  C

Material UNS Number: S31603

Required Thickness due to Internal Pressure [tr]:
= (P*R)/(S*E-0.6*P) per UG-27 (c)(1)
= (7.500*1450.0000)/(115.15*1.00-0.6*7.500)
= 98.2860 + 0.0000 = 98.2860 mm

Max. Allowable Working Pressure at given Thickness, corroded [MAWP]:
= (S*E*t)/(R+0.6*t) per UG-27 (c)(1)
= (115.15*1.00*99.0000)/(1450.0000+0.6*99.0000)
= 7.552 MPa

Maximum Allowable Pressure, New and Cold [MAPNC]:
= (S*E*t)/(R+0.6*t) per UG-27 (c)(1)
= (115.15*1.00*99.0000)/(1450.0000+0.6*99.0000)
= 7.552 MPa

Actual stress at given pressure and thickness, corroded [Sact]:
= (P*(R+0.6*t))/(E*t)
= (7.500*(1450.0000+0.6*99.0000))/(1.00*99.0000)
= 114.348 MPa

Percent Elongation per UHA-44  (50*tnom/Rf)*(1-Rf/Ro)  3.301 %
Note: Please Check Requirements of Table UHA-44 for Elongation limits.

SA-240 316L, Min Metal Temp without impact per UHA-51:  -196  C

Spherical Head From 40 To 50 SA-240 316L at 65  C

Longitudinal    Joint: Full Radiography per UW-11(a) Type 1
Circumferential Joint: Full Radiography per UW-11(a) Type 1

Material UNS Number: S31603

Required Thickness due to Internal Pressure [tr]:
= (P*R)/(2*S*E-0.2*P) per UG-27 (d)
= (7.500*1450.0000)/(2*115.15*1.00-0.2*7.500)
= 47.5321 + 0.0000 = 47.5321 mm

Max. Allowable Working Pressure at given Thickness, corroded [MAWP]:
= (2*S*E*t)/(R+0.2*t) per UG-27 (d)
= (2*115.15*1.00*49.0000)/(1450.0000+0.2*49.0000)
= 7.730 MPa

Maximum Allowable Pressure, New and Cold [MAPNC]:
= (2*S*E*t)/(R+0.2*t) per UG-27 (d)
= (2*115.15*1.00*49.0000)/(1450.0000+0.2*49.0000)
= 7.730 MPa

Actual stress at given pressure and thickness, corroded [Sact]:
= (P*(R + 0.2*t))/(2*E*t)
= (7.500*(1450.0000+0.2*49.0000))/(2*1.00*49.0000)
= 111.719 MPa

Percent Elongation per UHA-44  (75*tnom/Rf)*(1-Rf/Ro)  2.492 %
Note: Please Check Requirements of Table UHA-44 for Elongation limits.

SA-240 316L, Min Metal Temp without impact per UHA-51:  -196  C

Hydrostatic Test Pressure Results:

Pressure per UG99b    = 1.3 * M.A.W.P. * Sa/S          9.818  MPa
Pressure per UG99b[34] = 1.3 * Design Pres * Sa/S       9.750  MPa
Pressure per UG99c    = 1.3 * M.A.P. - Head(Hyd)       9.790  MPa
Pressure per UG100    = 1.1 * M.A.W.P. * Sa/S          8.308  MPa
Pressure per PED    = 1.43 * MAWP                   10.800  MPa

UG-99(b), Test Pressure Calculation:
= Test Factor * MAWP * Stress Ratio
= 1.3 * 7.552 * 1.000
= 9.818 MPa

Horizontal Test performed per: UG-99b

Please note that Nozzle, Shell, Head, Flange, etc MAWPs are all considered
when determining the hydrotest pressure for those test types that are based
on the MAWP of the vessel.

Stresses on Elements due to Test Pressure:

From To                Stress Allowable       Ratio Pressure
----------------------------------------------------------------------
20 30                   146.7    149.7       0.980       9.85
30 40                   150.1    149.7       1.003       9.85
40 50                   146.7    149.7       0.980       9.85
----------------------------------------------------------------------

The Maximum Allowable test pressure is                9.790  MPa

Elements Suitable for Internal Pressure.