Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Vahterus Shell
Summary of Contents for Vahterus Shell
- Page 1 User Manual for Vahterus Plate & Shell Heat Exchangers English...
- Page 2 All rights reserved. It is not permitted to copy, photograph or publish in any other way this manual for any purpose without the permission of Vahterus Oy. Plate & Shell is the registered trademark of Vahterus Oy. C303-3-rev.7 / 9/2018...
-
Page 3: Table Of Contents
Mechanical cleaning Pressure test 5.2.4 Analysis after cleaning Mounting brackets Openable model 5.3.1 Preparations 5.3.2 Opening the exchanger and removing the plate pack Permitted Conditions for Operating 5.3.3 Mounting the plate pack 5.3.4 Bolt/nut tightening pattern Design Fluids Flow rates... -
Page 4: General
This manual is your general guide to the proper installation, operation and maintenance of the Vahterus Plate & Shell Heat Exchanger and PSHE droplet separator. Please read it and follow the instructions carefully. Vahterus accepts no liability for damage caused... -
Page 5: Products
Plate & Shell VES A welded pack of circular plates inside A fully welded and removable plate All connections are on the end plate. Heat exchanger with external droplet a welded pressure vessel. The appli- pack inside an openable shell. -
Page 6: Structure
1.3 Structure 1.2 Products continues from last page: Vahterus Plate & Shell Heat Exchangers are designed and manufactured in compliance with legislation relating to pressure equipment. The design code used is given on the Vahterus Technical Data sheet. The codes generally used are: ¬... -
Page 7: Assembly Of The Heat Exchanger
With the openable model, there should be available space equal ¬ Steam (superheated & saturated) of all groups to the total length at the front in order to remove the plate pack. Ensure that there is ¬ 2 phase mediums (i.e. liquid-gaseous mixture) of all groups adequate space above the heat exchanger in order to lift it freely. -
Page 8: Pipes
Do not use the mounting brackets or nozzles to lift the heat exchanger. All pipe connections to and from the heat exchanger must be equipped with shut- off valves. Those with slow valve action are recommended. It should be possible Vahterus will assist in the planning of the lifting if needed, and separate lifting instruc- to increase and reduce flow rates gradually when the system is being shut down tions are available. Please contact Vahterus Service. -
Page 9: Steam Application (Condensers)
When the water vapour is on the shell side, the heat exchanger is provided with a striker plate, which is welded to the HOT IN connection to prevent water hammer. However, If the temperature on the shell side is below -10°C or above 65°C, insulation is recom- additional measures should be taken to prevent water hammer in the heat exchanger. -
Page 10: Mounting Brackets
Pressure testing of the plate pack in the openable heat exchanger should always be carried out with the plate pack positioned in the shell and the bolts on the cover plate tightened, in accordance with the instructions in this manual. When pneumatic leak or... -
Page 11: Fluids
< 60 mg/l at 80°C corrosion and biological corrosion. The chloride content of water can cause corrosion in AISI 316L/ 1.4404 plate materials in a short space of time. When water is boiling, in 0 mg/l, when T > 100°C particular, it causes chloride precipitation and this can lead to corrosion at quite small * Contact Vahterus when >... -
Page 12: Flow Rates
The construction is such that the flows alternate through the plate pack. The flows can be controlled as counter-current, co-current or cross-flow. Structure of the Vahterus Plate & Shell heat exchanger The Plate & Shell heat exchanger consists of circular plates welded into a pack, which is then mounted in a pressure vessel. The flow on the plate side is through the connections on the end plates via the plate pack. The flow on the shell side is through the shell connections via the plate pack using a flow director. -
Page 13: Liquid-Liquid
In liquid–liquid applications, the hot and cold sides can be mounted to either side of the COLD IN exchanger. In general, the hot side will be on the plate side and the cold liquid on the shell side. Both sides are clearly marked on the drawings and heat exchangers. General ... -
Page 14: Flooded Evaporator
COLD IN COLD OUT HOT OUT Evaporation always takes place on the plate side and cooling on the shell side. 4.1.4 Flooded Evaporator The heat exchanger system is the same as in 4.1.4, with the addition of a droplet sep- arator and recirculation pipe. -
Page 15: Steam Generator (Kettle)
The heat exchanger and pipelines are properly vented. ¬ Any safety appliances are correctly connected. Plate pack positioned in large shell. Steam generator application. ¬ There are no risk factors in the pipes that could cause shock pressure (water ham- mer) or sudden changes in pressure. -
Page 16: General Shut Down
If pressure is lower, cooling water can evaporate and there is a risk of plate damage. Openable model: When the openable model is being started up, always check the bolts and tighten them 4.4 Start-up and shut down of steam applications... - Page 17 Steam condenser with condensate side control: Start up the pump. Slowly open the inlet valve according to the instructions. The steam side must be filled with water when starting up the unit. Close the vent valve when all the air has been removed from the system. Check that the steam lines are empty of condensate. Begin the actual start-up procedure.
- Page 18 Steam generator: Check that the heat exchanger cold side is flooded with the condensate before opening the secondary side flow. First, open the hot side to start heating up. Open the valve gradually to prevent thermal shocks. Open the inlet valve of the primary side, allowing liquid to enter the generator. After that, open the outlet valve (start-up valve if any). If the unit is cold, the correct heating speed is 100°C/hour for the first 100°C. After that, the heating rate can be doubled.
-
Page 19: Recommended Periodical Inspections Of Pshes
¬ Internal inspection by opening the unit ¬ Visual check of shell chamber and plate pack Local requirements for pressure vessel inspections should also be followed. The in- spection periods will be re-evaluated by the inspector after every inspection according... -
Page 20: Recommendations For Cleaning
5.2 Recommendations for cleaning 5.2.1 Backwards flow In most cases loose materials such as organic compounds gathered on the surface of the plates can be removed by inverting the flow or through back flow washing with warm water or a cleaning medium. Warm water or cleaning medium is flushed at high speed on the primary and/or secondary side in the opposite direction to that of the normal operation (approx. 2–3 times the normal velocity). The valves in the connection pipes must be closed and the drain valves mounted on the pipelines opened. -
Page 21: Chemical Cleaning
Switch on the pump (4) and let it run for 30–40 minutes. During cleaning, intermittent- A chemical cleaning company experienced in cleaning of plate heat exchangers is rec- ly check the concentration and activity of the chemicals on the inlet and outlet side of ommended. -
Page 22: Analysis After Cleaning
5.3 Openable model Option 1 (recommended) Move the unit to a more specious area and turn it so that the end plate connections are The plate pack in openable heat exchangers can be taken out of the shell and cleaned facing upwards (plate pack vertical). -
Page 23: Mounting The Plate Pack
Remember to mark the position of the cover plate relative to the shell to ensure that the plate pack is put back in the same When pulling the plate pack out, keep it horizontal, if necessary by using lifting straps. -
Page 24: Bolt/Nut Tightening Pattern
Tighten the connections using a minimum of 5 revolutions, following the sequence. The following procedure is recommended: When the plate pack is being mounted in the shell, the position of the flow directors must be checked continuously. Revolution 1 – Start the bolt tightening by hand following the sequence, after which all of them should be evenly tightened by hand. -
Page 25: Spare Parts / Special Tools
The wood is free from quarantine pests and other injurious pests. The wood is ISPM15 compliant and supplied with the following saw-mill stamp. Openable heat exchanger: ¬ Flow directors ¬ Plate pack ¬ Gasket between the cover plate and flange ¬ Guide bars These parts can be supplied when the exchanger serial number is provided. - Page 26 If the exchanger is not working properly after start-up, please check the following be- The equipment must be stored in an area free from construction activities and vehicle fore contacting your Vahterus representative: transit that could cause accidental damage. The equipment must not come into contact with the ground.
- Page 27 Hole in Close plate pressure shock or plate: are the plate due to or shell side difference unsuitable temperature, corrosion valves and use a metre process fluid and liquids correct?
- Page 28 (openable according to nance/ check Localise performance surfaces on model) and instructions work plan leak e.g. with the plate or examine the (section 5).
- Page 29 Corrosion and cracking of the metal in the zone of the welds and close to the corrosion spots. ¬ Damage to the gaskets of flange connections or weakening of bolting. If there is a need to replace a plate pack for an openable heat exchanger, take the measurements at four different points inside the shell – see diagram below. 10 Recycling ...
- Page 30 ¬ Sufficient safety valves have been installed and adequate safety measurements have been taken into account. ¬ The plate pack or plate insert of an openable unit is never pressurised when outside the shell. ¬ Sufficient measures have been taken to prevent possible corrosion of the pressure vessel, particularly under the insulation.
- Page 31 Vahterus Oy Pruukintie 7 23600 Kalanti, Finland +358 2 84 070 Vahterus is certified by Kiwa Inspecta: ISO 9001 ISO 3834-2 ISO 14001 ISO 45001 vahterus.com...
Need help?
Do you have a question about the Shell and is the answer not in the manual?
Questions and answers