o Expansion Stress

Code requirements of max. Allowable safe limit i.e.75% is to be fulfilled.

Expansion Stresses >75% shall be highlighted in stress isometrics.

7.3 Equipment Nozzle Loading

Equipment nozzles, at the nozzle ↔ shell interface (welding point), are to be assessed at

design temperature as per Clause no.5.0.10 of Doc No. 6867-00-16-43-SP06 REV 0 (Page

8

of 24).

Nozzle allowable shall be based on the nominal diameter of the nozzle as listed on the

vendor drawing for that particular nozzle.

If e.g. a 12” nozzle is thickened at the nozzle-shell interface to 14”, the nozzle allowable

is

to be based on 12”, unless agreed with the equipment vendor/Mechanical department.

If

loads exceed the above mentioned criteria these loads have to be transmitted to

Mechanical

Department. Nozzle Pro calculations (nozzle flexibility) can be made by the Stress

Engineer,

however approval from Mechanical Department remains required.

For all static & Rotating equipments, the nozzle shall be checked at both design and

normal operating temperatures.

The actual nozzle loads shall be compared against allowable nozzle loads and shall be

qualified to suitable load cases.

7.4 Flange Loading

Flange stresses shall fulfil the requirements of ASME VIII Div I, App.2, taking the

corrosion allowance into consideration.

Flange allowable stress multiplier shall be taken as 1.0 (a factor 1.5 is not part of ASME

VIII Div I, App.2, but only applicable for flange calculation in accordance with ASME

B31.1).

Bolt allowable stress multiplier shall be 1.0.

Additional to the flange load check, a leakage check shall be performed as per Clause

no.2.7.3 of EDB Doc No. 6867-00-16-43-DB-01 REV B (Page 20 of 41).

It is recommended that determining the maximum loads on a flange, per size and pipe

class

and using the result for checking the actual flange loads.

7.5 Trunnions

Loads on trunnions shall be evaluated. Refer Appendix F for sample spreadsheet.

Trunnions should be checked for sustained, expansion and occasional loads. For

checking occasional loads, hot allowable can be increased by 20 %.

Trunnion lengths shall be taken as per Clause no.2.7.1 of EDB Doc No. 6867-00-16-

43-DB-01 REV B (Page 18 of 41). To qualify trunnions (sequence in order of

preference):

1. Reduce trunnion length.

2. Increase trunnion size (same size as run pipe is not applicable).

3. Increase wall thickness of trunnion.

4. Provide reinforcing pad of thickness same as of run pipe.

It is recommended to determining the maximum loads on a trunnion per size and

using the result for checking the actual trunnion loads.

7.6 Displacements

Displacements shall be identified in the following cases

o Rack Piping

Axial displacements > 75 mm and lateral displacements > 50 mm shall be

marked on the stress isometric.

o Vertical lines

Vertical displacements > 50 mm shall be marked on the stress isometric.

o Deflection limits shall be taken care as per Clause no.5.0.10 (vii) of Doc No.

6867-00-16-43-SP06 REV 0 (Page 10 of 24).

7.7 Friction Factor

The factors/limits shall be considered in the stress analysis as per Clause no.5.0.10

(vii) of Doc No.6867-00-16-43-SP06-REV 0 (Page 10 of 24).

7.8 Re-Analysis

In case of lay-out changes, the responsible stress engineer evaluates the changes

and decides to revise the analysis or to hand approve the change.

7.9Reanalysis is not recommended for minor changes in pipe routing, however reanalysis

will be required for major changes and the documents will be issued in next revision for

PMC approval indicating changes made in the report.

Piping Supports

Piping supports shall be taken care as per Clause no.5.0.11 of Doc No.6867-00-16-43-

SP06-REV 0 (Page 12 of 24).

8. DOCUMENTATION

Final flexibility analysis reports of piping shall be submitted as per Clause no.5.0.10 of

Doc No.6867-00-16-43-SP06-REV 0 (Page 12 of 24).

8.1 Stress Isometrics

Stress isometrics shall be marked with the following:

o X, Y & Z co-ordinates identification with respect to plant north

o Line no. and stress calculation no.

o Node Numbers at all points of interest

o Support function by arrow mark up

Resting + Guide +

Hold Down + Guide +Axial Stop

o Support details and loads with nodal points

o Axial/lateral displacement larger than 75mm

o Predefined thermal displacement considered in analysis

o Calculation number of connecting stress file, if available

o Calculated PSV thrust force with arrow mark up wherever applicable

o Low friction (LF) supports

o Axial, longitudinal and hold down Gaps

o Spring Hanger details with tag no.

o Reinforcement requirements

o Recommended reroutes

o Engineering and Fabrication/Inspection data

o Special requirements if any

o Vendor allowable nozzle loads, if any

o Assumptions and conclusions if any o Signatures of Analyst and Checker

8.2 Stress Documentation

For lines subjected to comprehensive computer stress analysis, the following

documentation shall be provided:

o Caesar ._a file, ._j file, ._p file (restraint loads), ._otl, cfg file and Units.fil file.

o List of lines for Flexibility Analysis

o List of lines for Dynamic Analysis

o List of lines for Seismic Analysis

o Slug force calculations, if applicable

o PSV reaction force calculations, if applicable

o Flange Leakage calculations

o Marked up stress isometrics

o Static, Dynamic and Seismic analysis reports

o Nozzle allowable load sheet

o WRC107/297 reports, if applicable

o Design check list

o Special pipe supports drawings

o Pipe support standard

o Static model review

o Dynamic mode shape plots

o Model displacement output

o Spring support schedule & data sheet

Total Stress Calculation files with Caesar II Input_ C2 File to be submitted.

8.3 Documentation

All documentation as mentioned in Clause no.5.0.10 of Doc No.6867-00-16-43-SP06-REV

0 (Page 12 of 24) shall be prepared as a hard copy & soft copies shall be sent by Email

for PMC review.

9. APPENDICES

9.1 Appendix A: TITLE SHEET

9.2 Appendix B: Caesar ii Unit File

UNITS = UNIT NOM/SCH INPUT= ON

Item Internal unit Constant

LENGTH inches x 25.400

FORCE pounds x 0.454

MASS(dynamics) pounds x 0.454

MOMENTS(INPUT) inch-pounds x 0.012

MOMENTS(OUTPUT) inch-pounds x 0.012

STRESS lbs./sq.in. x 1.0

TEMP. SCALE degrees F. x 0.5556

PRESSURE psig x 0.07

ELASTIC MODULUS lbs./sq.in. x 0.07

PIPE DENSITY lbs./cu.in. x 0.02768

INSULATION DENS. lbs./cu.in. x 0.02768

FLUID DENSITY lbs./cu.in. x 0.02768

TRANSL. STIF. lbs./in. x 0.179

ROTATIONAL STIF. in.lb./deg. x 1.152

UNIFORM LOAD lb./in. x 17.858

G LOAD g's x 1.000

User units

mm.

Kg.

Kg.

Kg.m.

Kg.m.

lbs./sq.in.

C

Kg/sq.cm

Kg/

sq.cm.

Kg./

cu.cm.

Kg./

cu.cm.

Kg./

cu.cm.

Kg./cm.

Kg.cm./

deg

Kg./m.

g's