ADDITIONAL TECHNICAL INFORMATION
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• Gasket life
» The life of a gasket principally
depends on operating temperatures,
temperature variations and chemical
influences.
» An increase in the temperature by
50º F (10º C) can reduce the life of
the gasket by 50% and a reduction of
the temperature by 50º F (10º C) can
increase the life of the gasket by 50%.
• Sealing performance of aging gaskets:
» Since all gasket elastomers suffer
from compression set with age and
temperature, aging gaskets will
eventually fail to properly seal.
» Elastomers used at relatively high
temperatures tend to harden and
their sealing performance at low
temperatures will deteriorate.
Because of this, it is essential to avoid
cold start-ups at high pressures.
• Swelling of gaskets:
» Although, APV plates and gaskets
are designed to withstand maximum
design pressures and temperatures,
certain working fluids or trace
constituents of these fluids can attack
the gaskets and cause sever swelling.
» Swelling may cause plate deformation.
LOCATE YOUR LOCAL DISTRIBUTOR FOR CERTIFIED SERVICE AND GENUINE SPARE PARTS.
Gaskets:
Plate Life:
The life expectancy of APV plates is subject to many factors, including:
• The process duty the plate is performing
• Cleaning agents used in the cleaning process
• Design and operation of the overall system
• Operating outside the parameters stipulated by SPX FLOW / APV
• Use of oxidizing chemicals and other corrosive material
• Failure to properly maintain and monitor the condition of the plates
We believe with proper process system design, appropriate use and
proper maintenance within the recommended plate compressed
dimension, the estimated life of a plate could be 7-8 years. Plate
pack integrity needs to be checked against a regular PM schedule.
Plates that have pin holes, cracks, excessive fouling or scaling must
be replaced immediately.
Frames:
• Tie bars are highly loaded. Grease the top bar and lubricate the tie
bars with Never-Seez.
• Do not allow load on connections, especially on grids which have
no strength to take pipe loads.
Shutdown:
• All liquids should be drained from the heat exchanger after shut
down to prevent precipitation of products or scale build-up.
• In the case of corrosive fluids, it may also be necessary to flush
with clean, non-corrosive water.
Pressure and Temperature Spikes:
• Pressure must change slowly in plate heat exchangers.
• Multi-section units breathe like a concertina during pressure
spikes which cause leakage and plates or gaskets.
• Pressure changes may cause movement and/or flexing of the
plate pack.
• Sudden changes in the operating pressure and temperatures
should be avoided.
• Shock cooling of the heat exchanger may cause leakages due to
sudden contraction of the sealing gaskets.
Testing available from SPX FLOW:
• One testing process available is the Testex system.
Testex consists of the detection of defective plates
in the plate heat exchanger through Electrolytic
Differential Analysis (EDA).
• EDA is used to determine if cross contamination is
present. A consistent rise in the conductivity of the
water indicates the presence of defective plates.
Testex features:
• The Testex range can pick up even the smallest
of cracks
• Testing is carried out under pressure
• Utilizes state-of-the-art monitoring equipment
• Identifies the occurrence of cross contamination
without the PHE being dismantled
• Adaptable to many models & sizes of PHE’s
• Testing is completed without opening the plate pack
SPX FLOW, Inc. reserves the right to incorporate our latest design and material changes without notice or obligation.
Design features, materials of construction, dimensional data and certifications as described in this bulletin, are provided for your information only and should not be relied upon
unless confirmed in writing. Please contact your local sales representative for product availability in your region. For more information visit www.spxflow.com.
The green “ ” and “ ” are trademarks of SPX FLOW, Inc.
APV-Heat-Exchangers-Plate-Maintenance-Checklist-APV-1237-FLR-US Version: 12/2020 COPYRIGHT © 2020 SPX FLOW, Inc.
Identification Number: APV-1237-US
SPX FLOW 611 Sugar Creek Road, Delavan, WI 53115
P: (262) 728-1900 or (800) 252-5200
E: leads@spxflowleads.com • www.spxflow.com
Based in Charlotte, North Carolina, SPX FLOW, Inc. (NYSE: FLOW) is a multi-industry manufacturing leader. For more information, please visit www.spxflow.com
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