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L/1

 Annex L. 10

 Annex LGuidance on structural tolerances

Figure L.1, Figure L.2, Figure L.3 and Figure L.4 of this annex give general structural tolerances. They aresupplementary to the requirements of 4.2.3, 4.2.4 and 4.2.5 and are for guidance.

 Any agreement to use these tolerances shall not remove the obligation to comply with Section 4.

Figure L.1 — Tolerances on nozzles

Item no. Type of deviations and elements considered Maximum deviationsauthorized

1.1 Levelness of flat joint span expressed as a function of joint thickness 0.2e

1.2 Deviation between the surface of a flange and the tangential line (LT) of an end or thereference line (LR)

±5 mm

1.3 Deviation between axis of a nozzle and the reference line (LR) Connection nozzle k100 mm ±5 mm

Other nozzles and manholes ±10 mm

1.4 Deviation between the axis of a nozzle with an axis parallel to that of the vessel ±5 mm

1.5 Deviation in relation to the theoretical orientation measured bythe circumferential deviation between the reference generatinglines and the nozzle

Connection nozzle ±5 mm

Manhole ±10 mm

1.6 Deviation between flange facing and vessel wall Connection nozzle ±5 mm

Manhole ±10 mm

1.7 Slope of the flange facing in relation to theoretical plane Connection nozzle ±"°

Manhole ±1°

For measurement apparatus ±!°

1.8 Deviation between nozzle axes for measurement apparatus ±1.5 mm

1.9 Difference in level between the two flange facings for measuring device ±1 mm

PD 5500:2009

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L/2

 Annex L

Figure L.2 — Tolerances after erection of a verticala

 vesselItem no. Type of deviations and elements considered Maximum deviations

authorized

2.1 Difference in length over distance L ofextreme tangential lines (LT)

Lk 30 000 mm ±15 mm

L > 30 000 mm ±20 mm

2.2 Wall straightness Local defect measured ongenerating line

±6 mm

2.3 Deviation between main axis of vessel and the vertical L (2.1) of vessel ±min (0.001 L; 30 mm)

2.4 Concentricity deviation of two sections with different diameters,expressed as a function of the greater diameter  D

±min (0.003 D; 20 mm)

2.5 Deviation over total height or overall length of the vessel Cumulative tolerances

a Items 2.1 and 2.5 also apply to horizontal vessels.

PD 5500:2009

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L/3

 Annex L

Figure L.3 — Tolerances on saddles and supports for horizontal vesselsItem no. Type of deviations and elements considered Maximum deviations

authorized

3.1 Flatness deviation of the bearing surface of asupport

Transverse direction ±2 mm

Longitudinal direction ±4 mm

3.2 Deviation between bearing sole plate and lower generating line of vessel ±3 mm

3.3 Deviation between axes of extreme supports ±5 mm

3.4 Deviation between axes of bolt holes ±3 mm

3.5 Deviation between diagonals of end saddles ±6 mm

3.6 Deviation between levels of end bearing sole platesmm

3.7 Deviation between saddle axis and vessel tangential or reference line (LR) ±5 mm

05+

PD 5500:2009

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L/4

 Annex L

Figure L.4 — Tolerances on saddles and supports for vertical vessels

Item no. Type of deviations and elements considered Maximum deviationsauthorized

4.1 Difference in the distance between the lower surface of supports or the basering and the reference line (LR)

±6 mm

4.2 Perpendicularity defect of supports or base ring in relation to vessel axis orskirt

±6 mm

4.3 Flatness defect ±4 mm4.4 Orientation deviation of axis of supports or

skin reference hole Dk 3 000 mm ±4 mm

3 000 mm <  Dk 6 000 mm ±8 mm

 D > 6 000 mm ±12 mm

4.5 Deviation between two bolt holes ±3 mm

4.6 Anchoring diameter deviation, expressed as a function of theoreticaldiameter  D

±min (0.002  D; 10)

PD 5500:2009

© BSI 2009