ORIFICE TYPE STEAM FLOW METER - Nikhil Technochem

ORIFICE TYPE

STEAM FLOW METER

THERMAX LIMITEDC&H, SERVICES SBU

COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS

MONITORING IS THE FIRST STEP TO SAVING MONEY

Steam measurement objectivesTo ensure steam generated by the boiler fulfils its design norms

To establish steam consumption of the plant

To estimate / establish steam consumption per batch of product

To establish product/process specific steam consumption

To establish steam losses, if any in process/plant

To save money by plugging the losses



Methods of measurement

Orifice plate with differential pressure transmitter (DPT)

Velocity proportional to Square Root of DP

Vortex type Based on vortex sheddingFlow to be fully turbulentHigh CostFrequent Calibration Required



Principle of OperationWhen steam passes through a restriction like an orifice plate installed in a pipeline, pressure drop occurs. A Differential pressure transmitter measures DP across the orifice

Steam flow is proportional to square root of this pressure drop

Density of a compressible fluid like steam is a function of pressure and temperature

The above input is taken in to computation unit by providing pressure and temperature sensors

The steam flow indicated is fully compensated for variation in density due to temperature and pressure variations.

Mass flow is calculated and values for both instantaneous and totalised steam mass flow displayed



Flow meter Selection CriteriaOnline density compensationEase of maintenanceFlow rangeLine size Steam pressureSteam quality – Dryness fraction of saturated steamPower supplyTurndownAccuracyMass flow computationEase of Calibration at siteDisplay requirement – Remote / multi-channel / PLCLow costLarge LED displayIBR certificationTamper proof programmingVast & reliable service network



Typical Schematic

Pressure Transducer

Computational & display unit

Differential pressure transmitter

Orifice plate

RTD

Condensate pot

Steam line



Installation of RTD

5 x D

D

∠45°

Steamflow



Material of ConstructionOrifice plate SS 316Impulse tubing SS 304Flanges ANSI 300#, WNRF, IBRCondensate pots ASTM A106 Gr B, IBRIsolation valves CS, IBRThree way manifold SS 304Needle valve with plugs SS 304Compression ferrule fittings SS 304RTD sensor - Thermowell SS 304, IBRAdaptor/Tee/Cross/Coupling SS304



Computational & Display UnitDisplay – 4 digit (instantaneous) / 6 digit (Totalized), o.5 inch height x 7 segment LED with programmable decimal point position

Mounting – Wall mounting

Protection class – IP 65 equivalent

Enclosure – Aluminium Die-cast

Operating Ambi temperature – 50 deg C

Maximum media temperature – 600 deg C

Maximum media pressure – 100 bar



Power Supply & Display optionsPower supply options

240V/ AC/50 / 60 HZ115 V AC 50/60HZ - Optional

Display instantaneous & totalizedRemote, wall mounted as standardPLC connectivity on request



AdvantagesEquipped with on-line density compensationDisplaying instantaneous, Totalized flow, steam pressure & steam temperatureSpecial computer designed orifice plate ensure accurate measurementSS tubing and compression fittings – easy to installHigh accuracy, moderate turn down, at low costAccuracy can be maintained at +/- 0.25% on full scaleLarge 7 segment LED display, easy to readFeatured with indication of superheated or wet steam when the temperature crosses +/- 7 deg C from saturation levelSupplied with SMPS which can accept wide voltage variation from 85 to 265 VFeatured with error diagnostics with alarm output as option



USP of Thermax Steam flow meterRugged design, fit & forget type3 level password protection ensures no tampering by unauthorized personsUser friendly programmable display unit, hence easy to install & recalibrate at siteUser has 4 alternatives for density compensation thus ensuring flow measurement even if one of the component fails. The alternatives include,

Pressure compensation Temperature compensation Pressure &temperature compensation Uncompensated mode

Low cost solution with accurate flow measurementRetransmission to PLC/PC on MODBUS RTU protocol, RS232 or RS485Zero maintenance cost due to zero moving part



Any feedback please contact,

info.c&[email protected]

THANK YOU

ORIFICE TYPE STEAM FLOW METER - Nikhil Technochem

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