UN 2000-01 Part 2 E (1997-02)

7/21/2019 UN 2000-01 Part 2 E (1997-02)

http://slidepdf.com/reader/full/un-2000-01-part-2-e-1997-02 1/6

Continued on pages 2 to 6

KRUPP UHDE STANDARD February 1997

Vessels and equipment

ATMOSPHERIC VESSELS

General specification

UN2000-01

Part 2

Behälter und Apparate; Drucklose Behälter; Technische Lieferbedingungen Supersedes 93-12

Contents

1 Scope............................................................................................................................................................ 1

2 Calculation.................................................................................................................................................... 12.1 Permissible stresses....................................................................................................................................... 22.2 Stress analysis ............................................................................................................................................... 2

3 Design........................................................................................................................................................... 23.1 Drawings and technical documents ................................................................................................................. 23.2 Wall thickness allowances............................................................................................................................... 33.3 Materials ........................................................................................................................................................ 33.4 Construction................................................................................................................................................... 3

4 Fabrication.................................................................................................................................................... 54.1 General .......................................................................................................................................................... 54.2 Welding.......................................................................................................................................................... 54.3 Painting.......................................................................................................................................................... 5

5 Nameplates................................................................................................................................................... 5

6 Tests and inspections .................................................................................................................................. 56.1 Leakage test................................................................................................................................................... 56.2 Inspection....................................................................................................................................................... 66.3 Inspection documentation ............................................................................................................................... 6

7 Shipment....................................................................................................................................................... 6

1 ScopeThis Krupp Uhde standard applies to vessels and equipment including accessories of metallic materials whichonly bear the pressure caused by the static load of the vessel inventory and in which, due to the mode of op-eration employed, no pressure or vacuum can build up or form which would classify the vessel as a pressure

vessel according to the applicable code in the country concerned.

If the relevant limits are exceeded and the vessel is considered as a pressure vessel which is subject to offi-cial inspection, Krupp Uhde standard UN 2000-01 Part 1 shall apply.

This general specification does not apply to vessels for refrigerated liquefied gases even if the operating pres-sure does not exceed the relevant limits.

This Krupp Uhde standard specifies the requirements to be taken into consideration for rating at Krupp Uhde'sand —if cited in the technical specification— at the manufacturer's. This Krupp Uhde standard does not ab-solve the user from meeting the requirements specified in the statutory regulations, codes and standards.

The scope of supplies covers the complete vessels or equipment according to the relevant specification in-

cluding all internals, bolts, gaskets and blind covers as well as the prime coat according to the painting speci-fication.

If the requirements outlined in this Krupp Uhde standard are in contradiction to those outlined in the relevanttechnical specification, the latter shall take precedence.

2 CalculationThe calculation shall be performed according to the applicable codes and standards, taking into considerationthe rules for the prevention of accidents and using the operating data indicated in the specification. In the caseof vessels where there is a risk of dust explosion due to the material being charged, it is imperative that thesevessels be designed according to the relevant codes and standards to render them resistant to pressure or pressure surges as a function of the max. explosion pressure or the reduced explosion pressure as a result of

relief openings.

Date Prepared Date Checked Date Approved

© 1997 Krupp Uhde GmbH Technical discipline: EN-EP

7/21/2019 UN 2000-01 Part 2 E (1997-02)


Page 2 UN 2000-01 Part 2

2.1 Permissible stressesThe permissible tensile stress of the vessel materials is specified in the relevant standard.

The permissible compression stress in the longitudinal direction of the vessel (stress resulting from weight,wind moment, etc.) shall not exceed the lowest values of the following two types of stress:

a) Permissible tensile stress

b) Permissible compression stress derived from the buckling strength calculation according to DIN 18800,Part 4, including wind loads as per AD Merkblatt S 3/0, section 4.1.4.6, or according to ASME Code, sec-tion VIII, division 1, paragraph UG-23 (b) (2).

The permissible stress for anchor bolts is 110 N/mm². During erection or repair work which requires the use of scaffolding, a stress of 150 N/mm² is permitted.

2.2 Stress analysisIn addition to calculating the wall thicknesses, the manufacturer shall make the following stress analyses for the corroded condition of the vessel:

• Erection conditionWeights: dead weight of the vessel without internals (to be installed later).Moments: wind moments for vessels including attachments, plus moments from eccentric loads, plus windmoment from the scaffolding.

• Operating conditionWeights: dead weight plus weight of all internals, attachments, insulation and inventories. Moments: windmoments for vessels including all attachments, plus moment from eccentric loads, plus other moments(e.g. nozzle loads). If an earthquake calculation has to be taken into consideration, the wind moment or theearthquake moment - whichever is the higher - shall be applied, unless otherwise specified in other na-tional regulations.

• Test conditionWeights: dead weight plus weight of all internals, attachments, insulation and water inventory.Moments: wind moments for vessels including all attachments plus moments from eccentric loads.

As regards the stress analysis, the static height of the water column shall be taken into consideration for the

leakage test.

The effect of the forces acting on the nozzles or brackets and of the moments acting on the vessel wall shallbe examined on the basis of the British Standard 5500 or Wichmann, Hopper, Mershon: "Local stresses inspherical and cylindrical shells due to external loadings", published in Welding Research Bulletin 107.

Supporting brackets shall be designed in such a manner that the max. load (operating weight or weight withwater inventory, wind moment, etc.) can be absorbed by half the number (by at least 2) of supporting brack-ets.

Evidence is required that vertical vessels can be lifted from the horizontal position at one end for erection pur-poses. Krupp Uhde is requested by the manufacturer to specify the load data.

Adequate wall rigidity of the vessel shall be ensured for transport.

The permissible compression stress according to section 2.1 also applies to the supports (skirts) of verticalvessels and shall also be applied analogously to the leakage test of vessels in their operating position.

Unless otherwise specified, allowance factor FB for platforms, ladders, piping and insulation shall be deter-mined for the wind load according to Krupp Uhde form UF 2000-26.

A rigidity analysis shall be made for the shells of horizontal vessels supported by two saddles. "Stresses inlarge horizontal cylindrical pressure vessels on two saddle supports" by Zick, L.P., published in the WeldingJournal (N.Y.), Res. Suppl., 1971 or British Standard 5500 App. G., contain generally accepted methods of calculation.

3 Design3.1 Drawings and technical documentsDrawings shall be prepared according to Krupp Uhde standard UN V401-01 Part 1. The metric system shallbe used for the dimensions and weights indicated in the drawings. Regarding form and contents, the manu-facturer's drawings shall correspond to the data specified in Krupp Uhde standard UN 2000-10 Part 1.

7/21/2019 UN 2000-01 Part 2 E (1997-02)


7/21/2019 UN 2000-01 Part 2 E (1997-02)



Nozzles for level gauges and controllers attached to the vessel bottom shall protrude 50 mm into the vessel toprevent fouling.

Drain nozzles shall not protrude into the vessel.

The nozzle pipes shall have a diameter of at least DN 50; reducing sections of smaller DN shall conform withthe DN of the flanged connection concerned. Deviations require Krupp Uhde's written approval.

The bolt holes of the flanges shall straddle the flange centerlines which shall coincide with or be parallel to thecenterlines of the vessel.

Threades sleeves are not permitted. Deviations require Krupp Uhde's written approval.

3.4.3 Manholes and inspection openingsIf the lower manhole of a vessel is located 1200 mm or more above the tangent line or a foot rest, ladder rungs and a holding grip above the manhole shall be provided inside the vessel. Refer to Krupp Uhde stan-dard UN 2000-08 for the design.

Block flanges are permitted for hand holes.

Manhole covers > 25 kg shall be provided with a davit. In the case of cold insulation, the covers shall behinged. Refer to Krupp Uhde standard UN 2000-11 Part 1 or Krupp Uhde standard UN 2000-04. In the case of manhole covers < 25 kg, a handle shall be provided.

3.4.4 Base ring templatesTwo base ring templates shall be fabricated to determine the exact positions of the anchor bolt holes in theskirt of vertical vessels. One template shall be forwarded to the job site as early as possible for the erection of the vessel foundation. The second template shall remain in the manufacturer's works. The templates shall befabricated from steel plates of approx. 5 mm thickness and be adequately reinforced for transport.

If the outside diameter is > 2000 mm, the templates shall be split into two segments which shall be joined byfitting bolts.

The top sides of the templates shall be marked with white oil paint and die-stamped letters as follows:• 0° / 90° / 180° / 270°

• 0° to be supplemented by "north"

• "Krupp Uhde order number"

• "item number"

• "top"

3.4.5 SupportsThe skirts shall be designed in accordance with Krupp Uhde standard UN 2000-05 Part 4 and legs in accor-dance with Krupp Uhde standard UN 2000-05 Part 5.

Horizontal vessels shall be equipped with saddles. Depending on the max. allowable working temperature, thesupport saddles shall be made of the following materials:> 120°C steel

5 to 120°C steel or concrete with plates of min. 6 mm thickness for corrosion protection< 5°C steel

For steel saddles of horizontal vessels, refer to Krupp Uhde standard UN 2000-05 Part 1 and Krupp Uhdestandard UN 2000-15.

3.4.6 Erection clips

For field erection of vessels, the erection clips shall be fabricated according to Krupp Uhde standard 2000-07Part 1. The erection clips for vertical vessels shall be arranged in such a manner that the vessel transported inhorizontal position can be lifted. If a vessel consists of several sections, the erection clips, clamps, etc. re-

quired for each section shall be agreed upon between the erection contractor and Krupp Uhde.

3.4.7 Supports for internals

Supports for internals such as supporting grids, vortex breakers, internal manifolds, etc. and all clips welded inplace shall be supplied by the vessel manufacturer.

The use of securing devices for the bolts of the internals shall be agreed upon between the manufacturer and

7/21/2019 UN 2000-01 Part 2 E (1997-02)


UN 2000-01 Part 2 Page 5

Krupp Uhde.

Table 2. Min. thickness of internals (without wear allowance)

Component Non-ferrous metals and

stainless steel Non-corrosion-resistant steel

Partitioning plates, downcomer plates,

weirs, draw-off pans, clamps, etc. 2 mmSupports of steel plate, supporting grids

2 mm

Supports of sectional steel 3 mm3 mm

Bolts M 10 M 10

It must be possible to install and remove all internals through the manhole. They shall not obstruct the accessto the manholes.

Unless otherwise specified, all internals shall be installed prior to delivery.

Internal components such as support rings, braces, webs, supports, etc. shall be attached to the vessel shellor tray by a continuous full-fillet weld, to be welded from both sides. If the component can only be welded onone side, full-penetration welding shall be performed.

3.4.8 Insulation clipsVertical vessels with insulation shall be provided with clips according to Krupp Uhde standard UN 2000-06Part 1.

3.4.9 Grounding terminalsThe vessels shall be equipped with grounding terminals as per Krupp Uhde standard UN 7061-02 Part 1.

4 Fabrication4.1 GeneralRefer to Krupp Uhde standard UN V416-01 Part 1 for the preparation of the welding bevels.

Shell sections shall not be rolled until the actual diameters of the heads have been determined.

Refer to Krupp Uhde standard UN 2000-02 Part 1 for the dimensional tolerances for vessels.

4.2 WeldingRefer to Krupp Uhde standard UN V416-01 Part 1 and/or UN V416-03 Part 1 for welding including testing,post-weld heat treatment and surface treatment.

4.3 PaintingType and scope are outlined in the applicable painting specification.

5 Nameplates All vessels shall be provided with a nameplate according to Krupp Uhde standard UN 2000-09 Part 1.

Unless otherwise specified, the nameplate of vertical vessels shall be attached above the lowest manhole andthe nameplate of horizontal vessels at the level of the vessel centerline.

Order number, item number and weight shall be indicated in 300 mm block letters (with due consideration of the transport position) at a conspicuous place on the vessel with weather-proof white paint.

In the case of vessels of several shell sections including their internals, each section shall be marked individu-ally for positioning and assembly purposes.

6 Tests and inspections6.1 Leakage test All vessels shall be subjected to a leakage test after completion but prior to painting. Unless otherwise speci-fied, the vessels shall be filled with water and inspected for leaks after a period of approx. 2 hours haselapsed. Removable linings shall be tested for leaks with Nekal solution.

Each chamber of multi-chamber vessels shall be tested individually.

7/21/2019 UN 2000-01 Part 2 E (1997-02)



Prior to dispatch, the manufacturer shall remove the end caps on nozzles with welding ends and shall re-chamfer the welding ends.

In the case of vessels fabricated completely or partly from austenitic steel or equipped with an austenitic lin-ing, the permissible chloride content indicated in Krupp Uhde standard UN V416-04 Part 1 shall be taken intoconsideration for the leakage test.

After completion of all leakage tests, all connections shall be opened, the vessel thoroughly cleaned and driedand all connections shall be re-closed.

6.2 Inspection All vessels designed and fabricated according to this Krupp Uhde standard are subject to inspection by KruppUhde and / or their client(s) and, if necessary, by the competent inspection authority. The scope of inspectionis specified in the inspection data sheets (IDS) and must be indicated in the manufacturers' fabrication andinspection schedules.

6.3 Inspection documentationThe inspection documentation shall correspond to the applicable standard or technical specification or to thepurchase order.

7 ShipmentThe shipping procedures shall correspond to Krupp Uhde's shipping and packing instructions. It is essentialthat the erection clips be located on the horizontal centerlines.

Reference standardsKrupp Uhde standards:UN V401-01 Part 1 Technical drawings; Principles of execution; General requirementsUN V416-01 Part 1 Welding; Welded joints for vessels and equipment; RequirementsUN V416-03 Part 1 Vessels and equipment; Surface treatment of austenitic stainless steels after weldingUN V416-04 Part 1 Water quality for pressure tests and flushing of equipment, pipelines and other compo-

nents

UN 2000-01 Part 1 Vessels and equipment; Pressure vessels; General specificationUN V462-01 Part 1 Vessels and equipment; Limits for the application of carbon steel in caustic serviceUN 2000-02 Part 1 Vessels and equipment; Dimensional tolerances for steel vesselsUN 2000-04 Vessels and equipment; Hinged manhole coversUN 2000-05 Part 1 Vessels and equipment; Support saddles for horizontal steel vesselsUN 2000-05 Part 4 Vessels and equipment; Supports for vertical steel vessels; SkirtsUN 2000-05 Part 5 Vessels and equipment; Supports for vertical steel vessels; LegsUN 2000-06 Part 1 Vessels and equipment; Insulation clips for vertical steel vesselsUN 2000-07 Part 1 Vessels and equipment; Lifting lugs and lifting trunnions for erection of steel vesselsUN 2000-08 Vessels and equipment; Internals; Vortex breakers, feed deflectors and ladder rungsUN 2000-09 Part 1 Vessels and equipment; Nameplate for vesselsUN 2000-10 Part 1 Vessels and equipment; Title blocks for manufacture's drawingsUN 2000-11 Part 1 Vessels and equipment; Swivel devices for manhole closures

UN 2000-15 Vessels and equipment; Connection plates for vessels supported by steel structuresUN 7061-02 Part 1 Earthing connections for vessels and equipmentKrupp Uhde forms:UF 2000-26 Vessels and equipment; Determination of allowance factor FB for calculating moments

from wind and other loadsDIN standards:DIN 18800 Part 4 Structural steelwork; Analysis of safety against buckling of shellsOther standards: AD Merkblatt S 3/0 General verification of the stability for pressure vessels; Basic principles ASME CodeSection VIII Boiler and Pressure Vessel Code; Rules for Construction of Pressure VesselsBS 5500 Specif ication for unfired fusion welded pressure vesselsWRC Bulletin 107 Local stresses in spherical and cylindrical shells due to external loadings

Documents

UN 2000-01 Part 2 E (1997-02)