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Standard nozzle flowmeter
Category: Nozzle flowmeter Product Brand: Hengding Instrument Product Model: HD-IS Product Description:
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Standard nozzle flowmeter
Using standard nozzles as throttling components
The standard nozzle, also known as ISA1932 nozzle, has the characteristics of high temperature and high pressure resistance, impact resistance, long service life, large measurement range, and high measurement accuracy. It is suitable for measuring the flow rate of high temperature and high pressure steam in power plants, heat network pipelines, and high flow fluids. The standard nozzle is designed and manufactured according to the national standard GB/T2624-93, and verified according to the national standard JJG640-94. No real flow calibration is required.
Scope of application of nozzle flowmeter
- nominal diameter: 50mm ≤ DN ≤ 500mm
- Nominal pressure: PN ≤ 32MPa
Reynolds number range: When 0.30 ≤ β ≤ 0.44, 70000 ≤ ReD ≤ 107
When 0.44 ≤ β ≤ 0.8, 20000 ≤ ReD ≤ 107
Aperture ratio: 0.30 ≤ β ≤ 0.80
- Accuracy: Level 1
Structural form of nozzle flowmeter
The standard nozzle consists of an inlet plane portion A perpendicular to the axis, an inlet contraction portion composed of arc-shaped curved surfaces B and C, a cylindrical throat E, and a protective groove F required to prevent edge damage. Its pressure tapping method is to use an angle joint for the upstream pressure tapping port, and a corner joint for the downstream pressure tapping port, which can be set according to the angle joint or located further downstream. Total length of nozzle
When 0.30 ≤ β ≤ 2/3, nozzle length=0.6041d
When 2/3 ≤ β ≤ 0.80, nozzle length={0.4041+(0.75/β -0.25/β 2-0.5225) 0.5} d
Using standard nozzles as throttling components
The standard nozzle, also known as ISA1932 nozzle, has the characteristics of high temperature and high pressure resistance, impact resistance, long service life, large measurement range, and high measurement accuracy. It is suitable for measuring the flow rate of high temperature and high pressure steam in power plants, heat network pipelines, and high flow fluids. The standard nozzle is designed and manufactured according to the national standard GB/T2624-93, and verified according to the national standard JJG640-94. No real flow calibration is required.
Scope of application of nozzle flowmeter
- nominal diameter: 50mm ≤ DN ≤ 500mm
- Nominal pressure: PN ≤ 32MPa
Reynolds number range: When 0.30 ≤ β ≤ 0.44, 70000 ≤ ReD ≤ 107
When 0.44 ≤ β ≤ 0.8, 20000 ≤ ReD ≤ 107
Aperture ratio: 0.30 ≤ β ≤ 0.80
- Accuracy: Level 1
Structural form of nozzle flowmeter
The standard nozzle consists of an inlet plane portion A perpendicular to the axis, an inlet contraction portion composed of arc-shaped curved surfaces B and C, a cylindrical throat E, and a protective groove F required to prevent edge damage. Its pressure tapping method is to use an angle joint for the upstream pressure tapping port, and a corner joint for the downstream pressure tapping port, which can be set according to the angle joint or located further downstream. Total length of nozzle
When 0.30 ≤ β ≤ 2/3, nozzle length=0.6041d
When 2/3 ≤ β ≤ 0.80, nozzle length={0.4041+(0.75/β -0.25/β 2-0.5225) 0.5} d
The required length of the straight pipe section for the nozzle (without flow regulator) (value expressed as a multiple of the pipe diameter D)
| Diameter ratio β | Nozzle and Venturi nozzle upstream side (inlet) | Downstream side (outlet) | ||||||||||||||||||||
| Single 90oBend or tee (fluid only flows out from one branch) | Two or more 90 on the same planeoelbow | Two or more 90 on different planesoelbow | The length of the tapered tube changes from 2D to D from 1.5D to 3D | Gradual expansion tube changes from 0.5D to D within the length range of D to 2D | Fully open ball valve | Fully open full bore ball valve or gate valve | Symmetrical rapid contraction tube | Thermowell or socket diameter less than 0.03D | The diameter of the thermometer sleeve or socket is between 0.03D and 0.13D | Front blocking components (excluding the last three) | ||||||||||||
| A | B | A | B | A | B | A | B | A | B | A | B | A | B | A | B | A | B | A | B | A | B | |
| 0.20 | 10 | 6 | 14 | 7 | 34 | 17 | 5 | 16 | 8 | 18 | 9 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 4 | 2 | |
| 0.25 | 10 | 6 | 14 | 7 | 34 | 17 | 5 | 16 | 8 | 18 | 9 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 4 | 2 | |
| 0.30 | 10 | 6 | 16 | 8 | 34 | 17 | 5 | 16 | 8 | 18 | 9 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 5 | 2.5 | |
| 0.35 | 12 | 6 | 16 | 8 | 36 | 18 | 5 | 16 | 8 | 18 | 9 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 5 | 2.5 | |
| 0.40 | 14 | 7 | 18 | 9 | 36 | 18 | 5 | 16 | 8 | 20 | 10 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 6 | 3 | |
| 0.45 | 14 | 7 | 18 | 9 | 38 | 19 | 5 | 17 | 9 | 20 | 10 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 6 | 3 | |
| 0.50 | 14 | 7 | 20 | 10 | 40 | 20 | 6 | 5 | 18 | 9 | 22 | 11 | 12 | 6 | 30 | 15 | 5 | 3 | 20 | 10 | 6 | 3 |
| 0.55 | 16 | 8 | 22 | 11 | 44 | 22 | 8 | 5 | 20 | 10 | 24 | 12 | 14 | 7 | 30 | 15 | 5 | 3 | 20 | 10 | 6 | 3 |
| 0.60 | 18 | 9 | 26 | 13 | 48 | 24 | 9 | 5 | 22 | 11 | 26 | 13 | 14 | 7 | 30 | 15 | 5 | 3 | 20 | 10 | 7 | 3.5 |
| 0.65 | 22 | 11 | 32 | 16 | 54 | 27 | 11 | 6 | 25 | 13 | 28 | 14 | 16 | 8 | 30 | 15 | 5 | 3 | 20 | 10 | 7 | 3.5 |
| 0.70 | 28 | 14 | 36 | 18 | 62 | 31 | 14 | 7 | 30 | 15 | 32 | 16 | 20 | 10 | 30 | 15 | 5 | 3 | 20 | 10 | 7 | 3.5 |
| 0.75 | 36 | 18 | 42 | 21 | 70 | 35 | 22 | 11 | 38 | 19 | 36 | 18 | 24 | 12 | 30 | 15 | 5 | 3 | 20 | 10 | 8 | 4 |
| 0.80 | 46 | 23 | 50 | 25 | 80 | 40 | 30 | 15 | 54 | 27 | 44 | 22 | 30 | 15 | 30 | 15 | 5 | 3 | 20 | 10 | 8 |
4 |
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