ORIFICE TYPE STEAM FLOW METER - Nikhil Technochem
ORIFICE TYPE STEAM FLOW METER THERMAX LIMITED C&H, SERVICES SBU
MONITORING IS THE FIRST STEP TO SAVING MONEY Steam measurement objectives To 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 COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Methods of measurement Orifice plate with differential pressure transmitter (DPT) Velocity proportional to Square Root of DP Vortex type Based on vortex shedding Flow to be fully turbulent High Cost Frequent Calibration Required COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Principle of Operation When 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 COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Flow meter Selection Criteria Online density compensation Ease of maintenance Flow range Line size Steam pressure Steam quality – Dryness fraction of saturated steam Power supply Turndown Accuracy Mass flow computation Ease of Calibration at site Display requirement – Remote / multi-channel / PLC Low cost Large LED display IBR certification Tamper proof programming Vast & reliable service network COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Typical Schematic Condensate pot RTD Steam line Pressure Transducer Orifice plate Computational & display unit Differential pressure transmitter COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Installation of RTD 45 Steam flow D 5xD COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Material of Construction Orifice plate Impulse tubing Flanges Condensate pots Isolation valves Three way manifold Needle valve with plugs Compression ferrule fittings RTD sensor - Thermowell Adaptor/Tee/Cross/Coupling SS 316 SS 304 ANSI 300#, WNRF, IBR ASTM A106 Gr B, IBR CS, IBR SS 304 SS 304 SS 304 SS 304, IBR SS304 COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Computational & Display Unit Display – 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 COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Power Supply & Display options Power supply options 240V/ AC/50 / 60 HZ 115 V AC 50/60HZ - Optional Display instantaneous & totalized Remote, wall mounted as standard PLC connectivity on request COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Advantages Equipped with on-line density compensation Displaying instantaneous, Totalized flow, steam pressure & steam temperature Special computer designed orifice plate ensure accurate measurement SS tubing and compression fittings – easy to install High accuracy, moderate turn down, at low cost Accuracy can be maintained at /- 0.25% on full scale Large 7 segment LED display, easy to read Featured with indication of superheated or wet steam when the temperature crosses /- 7 deg C from saturation level Supplied with SMPS which can accept wide voltage variation from 85 to 265 V Featured with error diagnostics with alarm output as option COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY USP of Thermax Steam flow meter Rugged design, fit & forget type 3 level password protection ensures no tampering by unauthorized persons User friendly programmable display unit, hence easy to install & recalibrate at site User 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 measurement Retransmission to PLC/PC on MODBUS RTU protocol, RS232 or RS485 Zero maintenance cost due to zero moving part COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
MONITORING IS THE FIRST STEP TO SAVING MONEY Any feedback please contact, info.c&hservices@thermaxindia.com THANK YOU COMMITTED TO DELIVER INNOVATIVE ENERGY SOLUTIONS
Steam measurement objectives To 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
as the fluid passes through the orifice is shown in Figure 2. The minimum cross-sectional area of the jet immediately after the orifice is known as the “vena contracta.” 3. How an Orifice Meter Works As fluid approaches the orifice, the pressure increases slightly and then drops suddenly as the fluid passes through the orifice.File Size: 1MB
tolerance primary equipment (meter tubes and orifice plates) is. critical. AGA Report No. 3-Part 2 (API 14.3) provides recommended design considerations of orifice meter tubes. The following-is an overview of primary orifice metering equipment. Orifice Flange Unions The original orifice plate holding device
Jan 17, 2002 · primary equipment (meter tubes and orifice plates) is critical. AGA Report No. 3 — Part 2 (API 14.3) provides recommended design considerations of orifice meter tubes. The following is an overview of primary orifice metering equipment. ORIFICE FLANGE UNIONS The original orifice plate holding device
3 Orifice plate with ring 3.1 Description Orifice ring assemblies are used for flow measurement of smaller or medium sized pipes at lower pressures. Each assembly consists of one orifice plate and two orifice rings. Differential pressures are taken out in a corner tap system. Orifice blocks, which are of a unit-construction type and provide .
Calibration of orifice meter Orifice meter was provided in the inlet pipe for the measurement of discharge. Orifice plate was made up of GI sheet having diameter of 0.06 m and the diame-ter of inlet pipe was 0.10 m. Ultrasonic flow meter was used for the calibration of coefficient of discharge of orifice meter. Different discharges were noted .
Limitations of Orifice Meter 1.The vena-contracta length depends on the roughness of the inner wall of the pipe and sharpness of the orifice plate. 2.Pressure recovery at downstream is poor. 3.Gets clogged when the suspended fluids flow. 4.The orifice plate gets corroded and due to this after sometime, inaccuracy occurs. 5.The coefficient of .
Volume and Mass Flow Rate Measurement, Page 2 Orifice flowmeter The obstruction in an orifice flowmeter is simply a blunt plate called an orifice plate with a hole of diameter d - an orifice - in the middle, as sketched to the right. V d D Orifice plate 1 2 We define β as the ratio of orifice diameter d to the inner diameter of the pipe D, β dD/ .
Orifice plate, model FLC-OP Orifice flange, model FLC-FL Annular chamber, model FLC-AC Applications . Steam - preferred suitable - not suitable Fig. left: Eccentric orifice plate Fig. right: Quarter circle orifice plate. WIKA data sheet FL 10.01 09/2019 Page 3 of 8
