Plate Heat Exchanger [PDF]

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February 1997



KRUPP UHDE STANDARD



Vessels and equipment PLATE HEAT EXCHANGER



UN 2100-01



General specification



Part 4



Behälter und Apparate; Plattenwärmeaustauscher; Technische Lieferbedingungen



1



General



1.1



Scope



Supersedes 85-09



This 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 standards such as the pressure vessel code.



1.2



Contradictions and deviations



If 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 specification, such deviations require the purchaser's written approval.



2



Design



The specified components shall conform to the state of the art. Any deviation from the approved designs or any proprietary configuration require the purchaser's written approval.



2.1



Types



The plate heat exchangers shall be vertical unless otherwise specified. Wall-mounted heat exchangers or other 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



Frame



The 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 arranged between the pressure plate and the frame plate and linked by means of an adequate number of tie rods housed in sleeves. The tightening torque required for the tie rods shall be indicated. The frame shall be designed such that the capacity can be increased by approx. 10 %, i.e. up to 50 exchanger plates can be added. It is imperative that the plates can be easily and quickly installed and removed without using a crane or a similar device.



2.3



Plates



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



2.4



Gaskets



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



2.5



Connections



In the case of single-pass constructions, the inlet and outlet connections shall be on the frame plate. If connections have to be arranged on the frame plate side and the pressure plate side, the nozzles shall be clearly indicated in the technical specification and workshop drawings. The pressure plate shall have back-flushing connections, if required. In order to provide adequate corrosion protection, the connection openings shall be lined with suitable materials. Rubber liners require the purchaser's written approval. Continued on page 2 Date



Prepared



Date



© 1997 Krupp Uhde GmbH



Checked



Date



Approved



Technical discipline: EN-EP



Page 2 UN 2100-01 Part 4



2.6



Materials of construction



The construction materials shall comply with the relevant vessel specification. The use of faulty materials is not 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 are of equivalent quality.



2.7



Drawings



The following items shall be shown in the drawings: main components of the plate heat exchanger including the 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



Fabrication



The 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 inspections



When the plate heat exchanger is inspected by the purchaser and/or his representative, the following tests and 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 the tested 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 for 20 minutes. The chloride content of the water used for the pressure tests shall comply with Krupp Uhde standard UN V416-04 Part 1. After performing the test and draining the heat exchanger, the vessel nozzles shall be closed.



5



Nameplate and tagging



The plate heat exchanger shall have a nameplate according to Krupp Uhde standard UN 2000-09, Part 1. This plate shall be attached to the frame plate. Moreover, the individual plates shall be tagged such that the material number, type of plate and serial number are clearly visible.



Reference Krupp Uhde standards UN 2000-09 Part 1 UN V416-04 Part 1



nameplate for vessels water quality for pressure tests and flushing