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KRUPP UHDE STANDARD February 1997

Vessels and equipment

PLATE HEAT EXCHANGER

General specification

UN2100-01

Part 4

Behlter und Apparate; Plattenwrmeaustauscher; Technische Lieferbedingungen Supersedes 85-09

1 General1.1 ScopeThis specification covers the requirements for design, fabrication and inspection of plate heat exchangers.

This general specification shall apply in conjunction with the related technical specifications, codes and stan-dards such as the pressure vessel code.

1.2 Contradictions and deviationsIf the requirements in this general specification are in contradiction with the relevant technical specification,the latter shall apply. If the manufacturer intends or has to deviate from the standards cited in this specifica-tion, such deviations require the purchaser's written approval.

2 DesignThe specified components shall conform to the state of the art. Any deviation from the approved designs orany proprietary configuration require the purchaser's written approval.

2.1 TypesThe plate heat exchangers shall be vertical unless otherwise specified. Wall-mounted heat exchangers orother special types may be used if this is agreed with the purchaser. If hazardous fluids such as acids, liquors,etc. are circulated in the heat exchanger, adequate splash guards shall be installed to protect the personnel.

2.2 FrameThe frame consists of a frame plate with fluid inlet and outlet, an upper suspension rod, a lower guiding rod,an end support and a pressure plate attached to said suspension rod. The heat exchanger plates are ar-ranged between the pressure plate and the frame plate and linked by means of an adequate number of tierods housed in sleeves. The tightening torque required for the tie rods shall be indicated. The frame shall bedesigned such that the capacity can be increased by approx. 10 %, i.e. up to 50 exchanger plates can beadded.

It is imperative that the plates can be easily and quickly installed and removed without using a crane or asimilar device.

2.3 PlatesPlates of the same shape (interchangeable) or of different shapes may be used, depending on the thermodynamicand thermohydraulic requirements. It is recommended that the plates be designed for convenient handling.

2.4 GasketsThe external edges and the holes of said plates shall have gaskets to be glued to the contact surfaces. Thegaskets may also be clamped or fixed by an adequate method. The gasket shall be shaped to isolate the flu-ids on both sides such that they cannot be mixed. The hollow space between the two toric sides of the gasketshall have a groove for discharging leak fluids.

2.5 ConnectionsIn the case of single-pass constructions, the inlet and outlet connections shall be on the frame plate. If con-nections have to be arranged on the frame plate side and the pressure plate side, the nozzles shall be clearlyindicated in the technical specification and workshop drawings. The pressure plate shall have back-flushingconnections, if required.

In order to provide adequate corrosion protection, the connection openings shall be lined with suitable materi-als. Rubber liners require the purchaser's written approval.

Date Prepared Date Checked Date Approved

1997 Krupp Uhde GmbH Technical discipline: EN-EP

Page 2 UN 2100-01 Part 4

2.6 Materials of constructionThe construction materials shall comply with the relevant vessel specification. The use of faulty materials isnot permitted and new gaskets have to be installed.

Materials other than those indicated in the documents require the purchaser's written approval even if they areof equivalent quality.

2.7 DrawingsThe following items shall be shown in the drawings: main components of the plate heat exchanger includingthe dimensions, positions of the nozzles, foundation loads, list of itemized components including the weights,and list of nozzles. A plate arrangement drawing shall also be prepared.

3 FabricationThe fabrication of the heat exchanger shall conform to the state of the art. The applicable specifications,codes and standards shall be observed.

4 Tests and inspectionsWhen the plate heat exchanger is inspected by the purchaser and/or his representative, the following testsand checks shall be performed: scope of supplies, including foundation bolts and special tools dimensional accuracy and proper workmanship (visual inspection) compliance of the materials with the specification, parts list and codes material certificates pressure test

The plate heat exchanger shall be subjected to a pressure test on both fluid sides, i.e. the pressure in thetested chamber shall be maintained for 50 minutes, the other chamber having atmospheric pressure only.Then, both chambers shall be subjected to a common pressure test, the pressure being maintained for20 minutes. The chloride content of the water used for the pressure tests shall comply with Krupp Uhdestandard UN V416-04 Part 1.

After performing the test and draining the heat exchanger, the vessel nozzles shall be closed.

5 Nameplate and taggingThe plate heat exchanger shall have a nameplate according to Krupp Uhde standard UN 2000-09, Part 1. Thisplate shall be attached to the frame plate.

Moreover, the individual plates shall be tagged such that the material number, type of plate and serial numberare clearly visible.

Reference Krupp Uhde standardsUN 2000-09 Part 1 nameplate for vesselsUN V416-04 Part 1 water quality for pressure tests and flushing