https://www.pdby2t.com 2026-11-01T21:05:13.405Z weekly 1 https://www.pdby2t.com/learning 2026-11-01T21:05:13.405Z monthly 0.8 https://www.pdby2t.com/learning/attachment 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/learning/rigging 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/learning/api661 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/learning/specialty 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/learning/attachment/load-sets-and-the-envelope 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/attachment/model-length-and-nozzle-end 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/attachment/shell-courses-insert-plates-and-tapers 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/attachment/brick-scls-validity-and-triaxial-check 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/rigging/lift-statics-and-angle-steps 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/rigging/lug-plate-checks-two-routes 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/rigging/shackle-pin-and-trunnion 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/rigging/tail-lug-twin-lugs-beam-and-base-ring 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/rigging/lug-fe-model-contents-and-limits 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/api661/box-is-not-a-cylinder 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/api661/appendix-13-sketches-and-stresses 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/api661/tube-hole-ligaments-13-6 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/api661/end-plates-stays-mawp-and-test 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/api661/fe-cross-check-and-what-is-verified 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/specialty/agitator-nozzle-loads 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/specialty/skirt-access-opening 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/specialty/eigenvalue-buckling 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/specialty/limit-load-analysis 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/specialty/specialty-validation-limits 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/learning/principles 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/local-loads-on-pressure-vessel-shells 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/primary-vs-secondary-stress 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/load-controlled-vs-displacement-controlled-loads 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/discontinuity-stress-in-pressure-vessels 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/stress-categories-and-limits 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/ratcheting-and-shakedown 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/shell-buckling-fundamentals 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/linear-eigenvalue-buckling-analysis 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/elastic-vs-elastic-plastic-analysis 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/nonlinear-material-models 2026-10-26T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/ovalisation-and-how-far-local-loads-reach 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/membrane-and-bending-stress-in-a-shell 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/stress-concentration-at-the-weld-toe 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/shell-to-head-junction-stresses 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/thermal-stress-free-expansion-and-restraint 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/ratcheting-and-the-bree-diagram 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/fatigue-from-s-n-curves-to-weld-design-curves 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/plastic-collapse-mechanisms-and-limit-load 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/buckling-imperfections-and-design-factors 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/principles/pressure-stiffening-and-softening 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog 2026-11-01T00:00:00.000Z weekly 0.7 https://www.pdby2t.com/learning/blog/how-wrc-537-checks-a-nozzle-step-by-step 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/when-wrc-537-stops-and-a-shell-model-is-needed 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/primary-vs-secondary-stress-at-a-nozzle 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzle-load-sets-sustained-operating-occasional 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzles-close-together-on-a-shell 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/clips-and-platform-supports-entering-a-footprint 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/agitator-nozzle-loads-gussets-and-fatigue 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/lifting-lug-checks-by-moss-and-aisc 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/vessel-on-legs-moss-chapter-4-checks 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/skirt-access-opening-stresses-and-buckling 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/limit-load-analysis-when-the-elastic-check-fails 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/api-661-plug-header-to-appendix-13 2026-10-31T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/wrc-537-or-shell-model-for-a-nozzle 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/wrc-107-297-and-537-what-changed 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzle-load-components-p-vc-vl-mc-ml-mt-and-signs 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/reinforcing-pad-nozzle-external-loads-wrc-537 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/hillside-and-tangential-nozzles-wrc-537 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/large-nozzle-openings-beyond-ug-36b-shell-model 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/obround-and-tombstone-openings-stress-analysis 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzle-on-formed-head-wrc-537-knuckle 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/how-wrc-537-handles-a-nozzle-on-a-cone 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzle-loads-on-a-flat-head-or-flat-plate 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzle-load-envelopes-unknown-signs 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/nozzle-load-tables-by-size-and-flange-rating 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/weld-toe-stress-in-a-shell-model-of-a-nozzle 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/where-to-place-a-stress-classification-line 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/annex-5a-stress-linearisation-worked-example 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/local-primary-membrane-stress-region-test 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/primary-plus-secondary-stress-range-limit-sps 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/why-check-nozzle-loads-with-pressure-off 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/how-long-should-the-shell-be 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/corrosion-allowance-in-a-local-model 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/shell-courses-and-thickness-steps-with-uw-9c-tapers 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/insert-plates-round-a-nozzle 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/q-lip-forged-and-long-weld-neck-nozzles 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/angle-and-channel-clips-entered-by-footprint 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/platform-and-ladder-clips-loads-and-checks 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/trunnions-against-plate-lugs 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/tailing-lug-with-base-ring-compression-ring-or-strut 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/lifting-a-vertical-vessel-the-moss-lift-steps 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/shackle-selection-and-the-pin-hole-fit 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/vessel-on-legs-the-leg-to-shell-check-by-wrc-537 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/legs-at-the-shell-to-cone-junction 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/horizontal-vessel-on-four-support-lugs-the-load-share 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/skirt-access-openings-tombstone-against-obround 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/skirt-buckling-under-weight-and-wind-with-the-design-factors 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/vacuum-vessels-with-attachments-what-changes 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/limit-load-against-the-elastic-check-rescuing-a-failing-nozzle 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/agitator-nozzle-fatigue-from-rotating-bending 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/learning/blog/air-cooler-plug-header-ligaments-and-appendix-13 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/modules/attachment 2026-11-01T21:05:13.405Z monthly 0.8 https://www.pdby2t.com/modules/rigging 2026-11-01T21:05:13.405Z monthly 0.8 https://www.pdby2t.com/modules/api661 2026-11-01T21:05:13.405Z monthly 0.8 https://www.pdby2t.com/modules/specialty 2026-11-01T21:05:13.405Z monthly 0.8 https://www.pdby2t.com/validation 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/validation/dossier 2026-11-01T00:00:00.000Z monthly 0.7 https://www.pdby2t.com/reference 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/examples 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/examples/nozzle-on-a-drum 2026-11-01T21:05:13.405Z monthly 0.7 https://www.pdby2t.com/questions 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/changelog 2026-11-01T21:05:13.405Z weekly 0.4 https://www.pdby2t.com/about 2026-11-01T21:05:13.405Z monthly 0.6 https://www.pdby2t.com/privacy 2026-11-01T21:05:13.405Z monthly 0.4 https://www.pdby2t.com/contact 2026-11-01T21:05:13.405Z monthly 0.4