Dear Group,

Please any body explain why I can't calculate WRC 107 at the head of vessel which is the axis of nozzle are collinier with axis of vessel ??

My second question how to define accaptance criteria (passed or failed) when we conducted WRC 297 ??

Thanks
Yogie.M

WRC 107 calculations are valid for only cylinder-cylinder connections.

Acceptance criteria for WRC 297 is the same as that for WRC 107. These two bulletins estimate the local stresses and these local stresses have limits defined in documents such as ASME Section VIII Division 2. CAESAR II will eventually include these stress checks for the WRC 297 stresses.

Dear Dave,

Thanks for your explanation, but my case are similar with case at COADE Mechanical Engineering News June, 1997 as summarized bellow :

Diameter Basis for Vessel VBASIS OD
Cylindrical or Spherical Vessel CYLSPH Spherical
Corrosion Allowance for Vessel CAS .0000 in.
Vessel Diameter DV 120.000 in.
Vessel Thickness TV .750 in.
Attachment Type TYPE Round
WRC107 Attachment Classification HOLSOL Hollow
Diameter Basis for Nozzle NBASIS OD
Corrosion Allowance for Nozzle CAN .0000 in.
Nozzle Diameter DN 12.750 in.
Nozzle Thickness TN .375 in.
Vessel Centerline Direction Cosine VX .000
Vessel Centerline Direction Cosine VY -1.000
Vessel Centerline Direction Cosine VZ .000
Nozzle Centerline Direction Cosine NX 1.000
Nozzle Centerline Direction Cosine NY .000
Nozzle Centerline Direction Cosine NZ .000

But why Caesar can't executed my case as bellow:
Vessel Type: Cylindrical
Vessel Node Number: 0
Vessel Diameter: ID 5384.800 mm.
Vessel Wall Thickness: 11.110 mm.
Vessel Corrosion Allowance: 3.200 mm.

Vessel Material Name: SA-285 C
Vessel Working Temperature: 590.000 C
Vessel Cold Allowable Stress: Smc 1103.820 kg./sq.cm.
Vessel Hot Allowable Stress: Smh 0.000 kg./sq.cm.

Attachment Type: Round Hollow
Attachment Node Number: 10
Nozzle Diameter: OD 914.000 mm.
Attachment Wall Thickness: 11.110 mm.
Attachment Corrosion Allowance: 3.200 mm.


Vessel Centerline Direction Cosine VX 0.000
Vessel Centerline Direction Cosine VY -1.000
Vessel Centerline Direction Cosine VZ 0.000
Nozzle Centerline Direction Cosine NX 0.000
Nozzle Centerline Direction Cosine NY 1.000
Nozzle Centerline Direction Cosine NZ 0.000
Z-axis UP? No

Global Force (SUS): FX -1.000 kg.
Global Force (SUS): FY -860.000 kg.
Global Force (SUS): FZ 0.000 kg.
Global Moment (SUS): MX 8.000 kg-cm.
Global Moment (SUS): MY 2466.000 kg-cm.
Global Moment (SUS): MZ 13393.000 kg-cm.
Internal Design Pressure (SUS): P 1.690 kg./sq.cm.
Include Pressure Thrust: No

Global Force (EXP): FX 222.000 kg.
Global Force (EXP): FY -691.000 kg.
Global Force (EXP): FZ 449.000 kg.
Global Moment (EXP): MX -218092.000 kg-cm.
Global Moment (EXP): MY 185576.000 kg-cm.
Global Moment (EXP): MZ 188520.000 kg-cm.

WRC107 Version/Year March 1979 Use B1&B2
Use Interactive Control No
Include Pressure Stress Indices per Div.2 No

Calculate Hoop Stress based on (from config): ID Diameter
Calculate Longitudinal Stress based on (from config): Lame Equation
*********************************************************************


Error Messages for WRC107 Analysis 1
ERROR - Directional Cosine of the Vessel and Nozzle Should Be Orthogonal.
The analysis will not be possible until there are no errors.

Thanks,-

A quote from the article you reference, "The Vessel and Nozzle direction cosine should always be perpendicular in order to use WRC-107."
Your error message says the same.