Diaphragm Seals - Gain › wp-content › uploads › 2020 › 02 › Wika-Diaphragm-Seals.pdfWIKA...

WIKA Benelux Karl Diependaal 2020

Introduction to Diaphragm Seals

Diaphragm Seals

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In the best hands for

generations 1946 Dipl.-Ing. Alexander Wiegand founds the company WIKA together with Philipp Kachel

1951 Dr. Konrad Wiegand takes his father's place

1967 Ursula Wiegand takes over the company

1984 Ursula Wiegand is the first woman to become Business Owner of the Year

1996 Alexander Wiegand leads the family business into the 21st century

A family business

Dipl.-Ing.

Alexander Wiegand

Dr. jur.

Konrad Wiegand Ursula Wiegand

Dipl.-Ing.

Alexander Wiegand



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Innovation from tradition

1979 WIKA launches the first electronic pressure measuring instruments

1986 WIKA takes over the Kachel thermometer factory

1994 WIKA is certified to DIN ISO 9001

1996 50-year jubilee: WIKA becomes the Number 1 worldwide for mechanical pressure and temperature gauges

1999 New sensor centre: 10,000 m2 production area featuring the latest in technology

2002 “WIKA goes lean”: Start of the Kaizen activities for production optimisation

2008 Majority holding in KSR KUEBLER Niveau-Messtechnik AG

2011 WIKA acquires DH-Budenberg and strengthens its leading position in calibration technology

2012 Acquisition of the companies Euromisure (primary flow elements) and Gayesco

(temperature measurement for furnace and reactor applications)

2017 Introduction of the measurand force in the WIKA portfolio

2018 WIKA acquires Hirschmann Mobile Machine Control Solutions (MCS)

Milestones



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[]

Unique breadth and depth of

product range

Range of products

PressureDisplay │ Transmit │Switch

TemperatureDisplay │ Transmit + Record │ Switch

LevelDisplay │ Transmit │ Switch

ForceForce transducers │ Load cells

FlowPrimary flow elements │

Flow switches │ Air flow sensors

CalibrationPressure │ Temperature

Current, voltage, resistance

SF6 gas solutionsMeasure │ Analysis & Detection │ Maintenance

AccessoriesFor all measurands

Engineered solutionsFor all measurands

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Efficient global production network

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12 DS Production Facilities

Advantages:

Close to the customer

Short delivery times

Flexible production



Diaphragm Seal

Basics

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Diaphragm seal is used…

To separate the measuring

instrument from the process media

To protect the sensitive measuring

instrument

To transfer the pressure up to the

measuring instrument

Diaphragm Seal (also called chemical seal or remote seal)

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Why do we need diaphragm seals?

When the process media is:

Aggressive

Corrosive

Very viscous

Heterogeneous and fibrous

Crystallized or polymerized

Toxic and can cause pollution

When the process media has extreme temperatures

When Location of tapping point is dificult to achieve

Process has specific requirements (for example hygienic)

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Diaphragm Seal System, Model 990.34

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Pressure measuring

instrument

pressure gauge

pressure transmitter

pressure switch

System fill fluid

Connection type:

Direct connection

Capillary

cooling tower

Diaphragm Seal

upper body

MembraneProcess connection:

Threaded

Flanged

Hygienic Diaphragm Seal

lower body



Comprehensive product portfolio

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Elke druk meting mogelijk, zolang zero en span

instelbaar



Cooling

element/DSS1

Direct

assembly/DSS1

Capillary/DSS2

Examples of the assembly

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Diaphragm Seal System for different

markets

Chemical & petrochemical facilities

Oil refineries

Gas facilities

Pulp and paper mills

Food and dairy processing

Water and waste water

Pharmaceutical facilities

Nuclear power plants

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Mounting optionsFlanged, threaded, sanitary

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Mounting options

flanged process connections

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extended diaphragm

cell inline design

Pancake

design

(cell)

flanged inline design

Flush diaphragm

Internal diaphragm



Flanged connection

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990.26

Flange type

with insert

990.29 Flange type

with extended

diaphragm

990.27

Flange type



Mounting options

threaded process connections

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Flush diaphragm

Welded design

Diaphragm probe seals

Internal membrane



Diaphragm Seal

working principle

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Volume variation VT

due to temperature change

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Temperature falls

System fill fluid contracts

Temperature rises

System fill fluid expands



Pressure impact, Model 990.22

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Dead volume V1

Full scale volume V2

Cross section-of

Bourdon Tube

Control volume of the instrument:

V2 - VI = V

Working Volume VM



Volume balance

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VM > V + VT + VComp.

Working volume of

membrane

control volume

of instrument

Volume variation

due to

temperature

volume variation due to

compression> + +

DSCP

-Tool



Tips to reduce the temperature effect

Use a larger diameter of the diaphragm.

This makes the diaphragm more flexible (less hard) and

it is able to absorb a higher degree of pressure change.

Typical 3” size is recommended.

Selection of proper system fill fluid

(this depends on the process temp. mainly, also

consider viscosity & specific gravity)

Minimize the capillary length and inner

diameter

Length is usually fixed based on the installation

requirements

Note:

Reducing the inner diameter will increase the

Response time! Please check the result carefully for

both temperature effect as well as response time!!

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DSCP

-Tool



Wetted parts

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Variaty of materials

Commonly used materials:

Stainless steel

Tantalum

Hastelloy

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Wetted parts: material getting into contact with the process medium

Other special materials:

UREA™ 316L

Monel

Inconel / Incoloy

Nickel

Titanium

Zirconium

Platinum

Gold plating

PFA coatings (FDA/Antistic)

Duplex 2205 / Superduplex

ECTFE (Halar®)

Wikaramic (ceramic coating)

Available materials can be seen in Technical Information IN.00.06



Diaphragm joining techniques

- laser welding -

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Back-up flange,

material = stainless steellaser welding

filling liquid

Diaphragm,

material = stainless steel




- TIG -

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filling fluid

Diaphragm,

material stainless steel

TIG - welding Basy body,

material stainless steel




- metallic bonding -

Patented WIKA process

Fully and evenly bonded over whole area of

sealing face

Suitable for extremely high and constant

temperatures limited by filling fluid only

Variety of different flange materials available

Diaphragm set back from sealing face - reduced

risk of damage during transport or installation

Metallic bonding is ideal preparation for filling

process

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Body, material SS

metallic bonding

filling liquid

diaphragm C59



Wetted parts material

- wikaramic® ceramic coating -

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Reliable; increases product lifetime

Provides protection against abrasive

materials for example sand, silicium

Application example: pulp and paper

industry

Diaphragm with wikaramic coating

Material: CR2O3/TIO2 (60/40)

Thickness: 40 μ

Surface quality: RA < 0,8 μ



Wetted parts material

- wikaramic® ceramic coating -

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2 diaphragm seals 990.23 with

wikaramic® at paper

manufacturer fripa in Miltenberg

Still working since December

2003!



Gold and Platinum for diaphragms

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Diaphragm with Gold-lining

against diffusion of molecular hydrogen, e.g.

during hydrogenating activities

layer thickness approx. 20 - 25 µm

Gold-lining is based on metallic bonded

diaphragms

Platinium - diaphragms

against diffusion of atomic hydrogen, e.g.

electrolyses

the solid platinium diaphragm is plastic bonded,

max. +260°C

Diaphragm seal versions

with flushed diaphragm as flange or threaded

type



System fill fluids for all kind of

applications

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General applications: silicon oil

Low temperatures (-130°C possible)

High temperatures (max. 400 °C)

Inert fill fluid (Halocarbon)

Oxygen applications

Chlorine applications

Food & Pharma

FDA (US Food & Drug Administration)

USP, EP (United States Pharmacopeia, European Pharmacopeia)



Special Solutions

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Diaphragm

monitoring system

Flyer Link DMS

https://en.wika.com/upload/FL_DiaphragmMonitoring_en_co_16262.pdf



Diaphragm Monitoring Systems

Link Data sheet DMS27 Link data sheet DMS34

Pressure measuring

instruments

Monitoring elements

https://en.wika.com/upload/DS_DS9523_en_co_82753.pdf

https://en.wika.com/upload/DS_DS9518_en_co_82733.pdf



Function of Diaphragm Monitoring

System

Inner

diaphragm

Outer diaphragm

vacuum

Vacuum channel for monitoring

of the outer diaphragm

Diaphragm seal fill fluid



Diaphragm Monitoring System

All welded design

Patented double-diaphragm system

for critical processes, where

process media is not allowed to get in

contact with the environment

the system fill fluid is not allowed to get

in contact with the process media

Increased safety

In case of a diaphragm rupture, an

optical or electrical warning signal is

given

Patent No. DE19949831



Extras

47



Precise engineering tool (DSCP)

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The Diaphragm Seal Calculation Program

(DSCP)

Provides a precise calculation of:

• volume balance,

• temperature effects

• response times

Continuesly improved and updated

Includes 3rd party instruments

Developed by WIKA

https://www.wika.nl/download_software_diaphragm_sea

ls_nl_bx.WIKA

https://www.wika.nl/download_software_diaphragm_seals_nl_bx.WIKA

https://www.wika.nl/download_software_diaphragm_seals_nl_bx.WIKA



Assembly of diaphragm seals with process transmitters of

well known manufacturers

Customers who trust in WIKA:

ABB

Azbil

Emerson

Endress + Hauser

Fuji

Honeywell

Schneider (Foxboro)

Siemens

Smar

Vega

Yokogawa

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Thanks for your attention.

Any questions?

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Contacts:

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Karl Diependaal

Area sales Manager

Tel. +31 475 535500

[email protected]

Richard jansen

Inside sales engineer

Tel. +31 475 535500

[email protected]

mailto:[email protected]

Diaphragm Seals - Gain › wp-content › uploads › 2020 › 02 › Wika-Diaphragm-Seals.pdfWIKA...

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