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Roots (waist wheel) flowmeter
Roots (waist wheel) flowmeter is a high-precision, high reliability, and wide range gas monitoring and measuring instrument. A new type of flowmeter t
Product details
Roots (waist wheel) flowmeter is a new generation flowmeter that integrates flow, temperature, and pressure detection functions, and can automatically compensate for temperature and pressure. Gas is a compressible fluid, and its volume value is closely related to temperature and pressure. In order to unify the standards of both trading parties, it is necessary to convert the actual volume into the standard volume under reference conditions (101.325 kPa 20 ℃). To achieve this goal, the Roots (waist wheel) flowmeter can accurately correct the volume of gas and is an ideal instrument for measuring non corrosive gases in industries such as natural gas, city gas, propane, nitrogen, and industrial inert gases.
Roots (waist wheel) flowmeterIt is mainly composed of components such as the shell, conjugate rotor, and intelligent flow integrator. A pair of conjugate rotors installed in the measuring room have a pressure difference (P) at the inlet and outlet of the circulating gasenter＞Pgo out）Under the action, the rotor is maintained in the correct relative position through precision machining of the tuning gear. The optimal working clearance is maintained between rotors, rotors and shells, and rotors and wall panels, achieving continuous non-contact sealing. Every time the rotor rotates, it outputs four times the effective volume of the measuring chamber's gas. The measurement process and working principle are shown in Figure 2 (only a quarter cycle is shown in the figure).
Roots (waist wheel) flowmeterIt consists of temperature and pressure detection, flow sensors, and microprocessor units. The microprocessor in the intelligent flow integrator compensates for temperature and pressure according to the gas equation, and corrects the compression factor. The gas equation is as follows:
In the formula: Qn: Volume flow rate under standard conditions (m)3/h）； QG: Volume flow rate under operating conditions (m)3/h）；
Pg: Gauge pressure at the pressure detection point of the flowmeter (kPa); Pa: Local atmospheric pressure (kPa);
Tg: absolute temperature of the medium (273.15+t) (K); t: Temperature of the measured medium (℃);
Zn: compressibility coefficient under standard conditions; Zg: Compression coefficient under working conditions;
Tn: Absolute temperature under standard conditions (273.15+20) (K); Pn: Standard atmospheric pressure (101.325 kPa).
Note: Natural gas Zn/Zg=Fz2， Fz is called the supercoressure factor and is calculated according to the formula in the standard SY/T6143-1996 of China National Petroleum Corporation.
- Wide range:
- Low initial flow rate:
- High precision and high repeatability:
- Low pressure loss:
- High integration, low power consumption
- Compact structure:
- Digital pressure temperature sensor
- Segmented correction
- Complete data storage function,
- Basic output is complete.
- Data traceability management
- GPRS Real time Management System
This flowmeter complies with the metrological technical specifications and standards of JB/T 7385-1994 "Gas waist wheel flowmeter" and JJG633-2005 "Gas volumetric flowmeter calibration regulation", and conforms to the national standards GB3836.1-2010 "Explosive Environment Part 1: General Requirements for Equipment" and GB3836.4-2010 "Explosive Environment Part 4: Equipment Protected by Intrinsic Safety" i "
Accuracy level:
Level 1.0: Qmax-0.2Qmax ± 1.0% 0.2 Qmax Qmin ± 2.0%
Level 1.5: Qmax-0.2Qmax ± 1.5% 0.2 Qmax Qmin ± 3.0%
Unless otherwise specified, the product is manufactured with a precision level of 1.5. For other accuracies, special instructions are required for customization when ordering.
Flow meter specifications, basic parameters, and performance indicators(See Table 1)
(The above parameters are subject to modification without prior notice)
Accuracy level:
Level 1.0: Qmax-0.2Qmax ± 1.0% 0.2 Qmax Qmin ± 2.0%
Level 1.5: Qmax-0.2Qmax ± 1.5% 0.2 Qmax Qmin ± 3.0%
Unless otherwise specified, the product is manufactured with a precision level of 1.5. For other accuracies, special instructions are required for customization when ordering.
Flow meter specifications, basic parameters, and performance indicators(See Table 1)
| Type specification number | nominal orifice DN （mm） |
Range ratio | internet traffic range （m3/h） |
Initiation internet traffic m3/h |
At Qmax pressure loss kPa |
yi | Instrument coefficient | maximum work pressure MPa |
nominal pressure MPa |
material |
| TLLQ-10 | 25 | 12:1 | 0.5-10 | 0.04 | 0.10 | <0.6 | 1.6 | aluminum alloy |
||
| TLLQ-16 | 25 | 20:1 | 0.8-16 | 0.04 | 0.10 | 7633.37 | ||||
| TLLQ-25 | 40 | 25:1 | 1-25 | 0.07 | 0.10 | 4694.65 | <1.2 <2.0 |
1.6 2.5 |
||
| TLLQ-40 | 40 | 40:1 | 1-40 | 0.07 | 0.14 | 3892.31 | ||||
| TLLQ-65 | 50 | 65:1 | 1-65 | 0.1 | 0.10 | 1584.24 | ||||
| TLLQ-85 | 50 | 70:1 | 1.1-85 | 0.1 | 0.14 | 1584.24 | ||||
| TLLQ-100 | 80 | 70:1 | 1.5-100 | 0.1 | 0.11 | 987.581 | ||||
| TLLQ-150 | 80 | 120:1 | 1.2-150 | 0.12 | 0.15 | 730.785 | ||||
| TLLQ-200 | 80 | 70:1 | 3-200 | 0.15 | 0.18 | 479.837 | ||||
| TLLQ-250 | 100 | 80:1 | 3-250 | 0.11 | 0.18 | 306.804 | <1.2 |
1.6 |
||
| TLLQ-300 | 100 | 120:1 | 2.5-300 | 0.11 | 0.13 | 306.804 | ||||
| TLLQ-450 | 100 | 110:1 | 4-450 | 0.1 | 0.20 | 231.350x2 | ||||
| TLLQ-500 | 100 | 125:1 | 4-500 | 0.1 | 0.20 | |||||
| TLLQ-650 | 150 | 80:1 | 8-650 | 0.65 | 0.35 | 86.7083 | Aluminum, cast iron | |||
| TLLQ-1000 | 150 | 90:1 | 11-1000 | 0.76 | 0.45 | 61.8990 | Aluminum, cast iron | |||
| TLLQ-1600 | 200 | 64:1 | 25-1600 | 1.2 | 0.50 | 50.2425 | Aluminum, cast iron | |||
| TLLQ-3000 | 250 | 40:1 | 75-3000 | 8.0 | 0.45 |
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