CONVERSION CHART Velocity Pressure (IN. W.C.) to Velocity

SPEC EP-0024-1

CONVERSION CHART

Velocity Pressure (IN. W.C.) to Velocity (FPM)

VP

.001

.002

.003

.004

.005

.006

.007

.008

.009

.010

.011

.012

.013

.014

.015

.016

.017

.018

.019

.020

.021

.022

.023

.024

.025

.026

.027

.028

.029

.030

.031

.032

.033

.034

.035

.036

.037

.038

.039

.040

.041

.042

.043

.044

.045

.046

.047

.048

.049

.050

.051

.052

.053

.054

.055

.056

.057

.058

.059

.060

V

127

179

219

253

283

310

335

358

380

400

420

439

457

474

491

507

522

537

552

566

580

594

607

620

633

646

658

670

682

694

705

716

728

738

749

760

770

781

791

801

811

821

830

840

850

859

868

877

887

896

904

913

922

931

939

948

956

965

973

981

VP

.061

.062

.063

.064

.065

.066

.067

.068

.069

.070

.071

.072

.073

.074

.075

.076

.077

.078

.079

.080

.081

.082

.083

.084

.085

.086

.087

.088

.089

.090

.091

.092

.093

.094

.095

.096

.097

.098

.099

.100

.101

.102

.103

.104

.105

.106

.107

.108

.109

.110

.111

.112

.113

.114

.115

.116

.117

.118

.119

.120

V

989

997

1005

1013

1021

1029

1037

1044

1052

1060

1067

1075

1082

1089

1097

1104

1111

1119

1126

1133

1140

1147

1154

1161

1168

1174

1181

1188

1195

1202

1208

1215

1221

1228

1234

1241

1247

1254

1260

1266

1273

1279

1285

1292

1298

1304

1310

1316

1322

1328

1334

1340

1346

1352

1358

1364

1370

1376

1382

1387

VP

.121

.122

.123

.124

.125

.126

.127

.128

.129

.130

.131

.132

.133

.134

.135

.136

.137

.138

.139

.140

.141

.142

.143

.144

.145

.146

.147

.148

.149

.150

.151

.152

.153

.154

.155

.156

.157

.158

.159

.160

.161

.162

.163

.164

.165

.166

.167

.168

.169

.170

.171

.172

.173

.174

.175

.176

.177

.178

.179

.180

V

1393

1399

1405

1410

1416

1422

1427

1433

1438

1444

1450

1455

1461

1466

1472

1477

1482

1488

1493

1499

1504

1509

1515

1520

1525

1530

1536

1541

1546

1551

1556

1561

1567

1572

1577

1582

1587

1592

1597

1602

1607

1612

1617

1622

1627

1632

1637

1642

1646

1651

1656

1661

1666

1671

1675

1680

1685

1690

1694

1699

VP

.181

.182

.183

.184

.185

.186

.187

.188

.189

.190

.191

.192

.193

.194

.195

.196

.197

.198

.199

.200

.201

.202

.203

.204

.205

.206

.207

.208

.209

.210

.211

.212

,213

.214

.215

.216

.217

.218

.219

.220

.221

.222

.223

.224

.225

.226

.227

.228

.229

.230

.231

.232

.233

.234

.235

.236

.237

.238

.239

.240

V

1704

1709

1713

1718

1723

1727

1732

1737

1741

1746

1750

1755

1759

1764

1769

1773

1778

1782

1787

1791

1796

1800

1804

1809

1813

1818

1822

1827

1831

1835

1840

1844

1848

1853

1857

1861

1866

1870

1874

1879

1883

1887

1891

1896

1900

1904

1908

1912

1917

1921

1925

1929

1933

1937

1941

1945

1950

1954

1958

1962

VP

.241

.242

.243

.244

.245

.246

.247

.248

.249

.250

.251

.252

.253

.254

.255

.256

.257

.258

.259

.260

.261

.262

.263

.264

.265

.266

.267

.268

.269

.270

.271

.272

.273

.274

.275

.276

.277

,278

.279

.280

.281

.282

.283

.284

.285

.286

.287

.288

.289

.290

.291

.292

.293

.294

.295

.296

.297

.298

.299

.300

V

1966

1970

1974

1978

1982

1986

1990

1994

1998

2003

2007

2010

2014

2018

2022

2026

2030

2034

2038

2042

2046

2050

2054

2058

2062

2066

2069

2073

2077

2081

2085

2089

2093

2096

2100

2104

2108

2112

2115

2119

2123

2127

2131

2134

2138

2142

2146

2149

2153

2157

2160

2164

2168

2172

2175

2179

2183

2186

2190

2194

VP

.31

.32

.33

.34

.35

.36

.37

.38

.39

.40

.41

.42

.43

.44

.45

.46

.47

.48

.49

.50

.51

.52

.53

.54

.55

.56

.57

.58

.59

.60

.61

.62

.63

.64

.65

.66

.67

.68

.69

.70

.71

.72

.73

.74

.75

.76

.77

.78

.79

.80

.81

.82

.83

.84

.85

.86

.87

.88

.89

.90

V

2230

2266

2301

2335

2369

2403

2436

2469

2501

2533

2564

2596

2626

2657

2687

2716

2746

2775

2803

2832

2860

2888

2916

2943

2970

2997

3024

3050

3076

3102

3128

3154

3179

3204

3229

3254

3278

3303

3327

3351

3376

3398

3422

3445

3468

3491

3514

3537

3560

3582

3604

3627

3649

3671

3692

3714

3736

3757

3778

3799

VP

.91

.92

.93

.94

.95

.96

.97

.98

.99

1.00

1.01

1.02

1.03

1.04

1.05

1.06

1.07

1.08

1.09

1.10

1.11

1.12

1.13

1.14

1.15

1.16

1.17

1.18

1.19

1.20

1.21

1.22

1.23

1.24

1.25

1.26

1.27

1.28

1.29

1.30

1.31

1.32

1.33

1.34

1.35

1.36

1.37

1.38

1.39

1.40

1.41

1.42

1.43

1.44

1.45

1.46

1.47

1.48

1.49

1.50

V

3821

3841

3862

3883

3904

3924

3944

3965

3985

4005

4025

4045

4065

4084

4104

4123

4143

4162

4181

4200

4220

4238

4257

4276

4295

4314

4332

4351

4369

4387

4405

4424

4442

4460

4478

4496

4513

4531

4549

4566

4584

4601

4619

4636

4653

4671

4688

4705

4722

4739

4756

4773

4789

4806

4823

4839

4856

4872

4889

4905

P.O. Box 465 Garner, North Carolina 27529 TELEPHONE 1-800-656-2004 or 919-779-2004

? ULTRATECH - A Hamlin Company, 2000



VP

1.51

1.52

1.53

1.54

1.55

1.56

1.57

1.58

1.59

1.60

1.61

1.62

1.63

1.64

1.65

1.66

1.67

1.68

1.69

1.70

1.71

1.72

1.73

1.74

1.75

1.76

1.77

1.78

1.79

1.80

1.81

1.82

1.83

1.84

1.85

1.86

1.87

1.88

1.89

1.90

1.91

1.92

1.93

1.94

1.95

1.96

1.97

1.98

1.99

2.00

2.01

2.02

2.03

2.04

2.05

2.06

2.07

2.08

2.09

2.10

V

4921

4938

4954

4970

4986

5002

5018

5034

5050

5066

5082

5098

5113

5129

5145

5160

5176

5191

5206

5222

5237

5253

5268

5283

5298

5313

5328

5343

5358

5373

5388

5403

5418

5433

5447

5464

5477

5491

5506

5521

5535

5549

5564

5578

5593

5607

5621

5636

5650

5664

5678

5692

5706

5720

5734

5748

5762

5778

5790

5804

FAX 919-779-5768

CALCULATIONS

Velocity Pressure (IN. W.C.) = Total Pressure - Static Pressure

Velocity Pressure (IN. W.C.) = (CFM/Effective Area/4005)2

Volume (CFM) =

IN. W.C. X 4005 X Effective Area

Velocity (CFM) = FPM X Effective Area

Velocity (FPM) = CFM/Effective Area

Velocity (FPM) = 4005 X

IN. W.C.

AIRFLOW MEASURING CONSIDERATIONS

The Pitot tube is the primary standard used to calibrate all other airflow measuring devices. Therefore, it is a natural application for use in

devices that measure airflow in ducts and pipes for HVAC or industrial

processes. Since a single Pitot tube is greatly affected by variations of

the flow profile across the duct, multiple Pitots connected in an averaging arrangement will provide much greater accuracy and repeatability

for control purposes. Even multiple averaging Pitots are affected by

turbulence so straightening vanes are incorporated into ULTRAC Airflow

Measuring Stations to prevent turbulence-produced errors.

The figures below illustrate the fixed traverse pattern used to determine

the layout of measuring points in ULTRAC AMS thus providing the fixed

traverse which is standard in the industry.

AREA & MEASUREMENT POINT RELATIONSHIPS

ROUND

DUCT

EQUAL

AREAS

RECTANGULAR

DUCT

.316R

.548R

.707R

.837R

.949Radius

EQUAL

AREAS

MEASURING POINTS

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