could anybody advice on pressure and temperature compensated natural gas flow measurement?
i have to measure natural gas flow whose temperature could rise to 150°F and pressure to 1150 psi.
i am using honeywell STD 924DP transmitter for flow measurement and honeywell STG 974 transmitter for pressure measurement. i am using honeywell experion PKS DCS for the process control.
Rosemount 3095MV for a compensated DP flow. They can be configured for a variety of primary elements, feed it an RTD or TC and you should be in good shape.
If you have the K factor (for the flow element) and 3 measurements, differential pressure, absolute pressure and medium temperature, you can calculate the mass flow.
Q = K * sqrt(dp*pressure/temp)
You have one measurement, DP, of 3 needed to calculate mass flow.
So, you can add an absolute pressure transmitter and a temperature transmitter (maybe either is there already).
Or, you could replace the DP transmitter with a Honeywell multivariable transmitter (model SMA 1xx) , which is measures DP, AP and temperature and calculates the mass flow. It uses an RTD or thermocouple input for temperature measurement.
best option for natural gas flowmeter is Vortex Flowmeter with inbuilt temp and pressure compentation. Jrohne Germany is famous in natural gas flowmetering. U will get accuracy of 1% zero maintenance. Doesn't require any additional cost like cabling cost
FORBES MARSHALL PVT LTD
You will need the AGA3 and possibly AGA8 gas calculations. You can probably get these as functions for the Experion system from Honeywell. AGA3 is fairly straight forward. You can use a perodic calculation if all your looking for is gross volumeteric flow. I don't have the equations handy but they are probably easy to find on the Internet. BTU is also very common in natural gas and required to calculate efficiency.
We may need to comply with contractual agreement if there is custody transfer of the gas. The contract will dictate the method of calculation and base conditions. The Exerion system may or may not be an acceptable calculating device.
I hope this helps,
Pipeline Systems Inc.
Can anyboday Help for AGA-3 block calculations using Honeywell Experion PKS with C200 controller. we are on ONGC-Offshore site and facing problem for configuring the same.
HAIL:MSP site team.
Dear friend;you must recalculate the flow by this eq.:
Q1:measurment flow by transmitter
T:gas temp.(measured temp.)in kelvin
P:gas press.(measured press.)absolut!add barometery pressure.
Pc:nominal press. .(design temp.)that narrow device (oriffice ,..) calculated on it.
absolut!add barometery pressure.
Tc:nominal temp..(design temp.)that narrow device (oriffice ,..) calculated on it.in kelvin
of course i have a completed note if you want please contact firstname.lastname@example.org
We can calculate natural gas compensated flow by orifice plate flow meter,turbine type and vortex type but the most accurate method is vortex flow meter. Turndown ratio of orifice flow is 1:8 and vortex flow is 1:30 it has no moving parts,no maintenance,no o ring or seal,easily install inplace of orifice plate and no need to caliberate again untill flow media change, you can visit our web side which has perfect solutions for any kind of flow.
Imran ahmed khan
+92 300 2368388,+92 334 3593388
999 Route 9
Parlin, New Jersey 08859tel: 732.294.5525tel: 732.952.5324fax: 732.727.8911
Yes, Vortex has been a choice of flow meter to meter Natural Gas & other gas metering application but today there are many choices to look at VERABAR Flow Element(Turn Down 10:1), ACCELABAR (Turn Down of 60:1) etc. Visit www.veris-inc.com to know more about it.
ACCELABAR is cathcing up the market to win a respectable position over Vortex due to its capabilities to meter a larger turndown.
We manufacture Electronic Flow Measurement devices that calculate gas flo in the ranges you have listed. These also give you historical logs in hourly or daily formats. Gas compensated for pressure, temperature, and composition.
http://www.nuflotech.com Scanner 1150.