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ASME B16.5 VS ASME B16.47

Views: 68     Author: Site Editor     Publish Time: 2023-10-27      Origin: Site

ASME B16.5 and ASME B16.47 are both producing standards of flanges for the size and pressure rating difference .The differs contain: The main difference between ASME B16.5 and ASME B16.47 is that they cover different flange size ranges.


STANDARD

ASME B16.5

ASME B16.47

SEALING FACE

RF , RTJ , FF

RF,RTJ

SIZE RANGE

1/2"- 24" / DN15 – DN600

26"-60"/DN650-DN1500

PRESSURE RATING

Class 150, 300, 600, 900, 1500, 2500lb

A:Class150,300,400,600,900

B:Class75,150,300,400,600,900

MATERIAL

Carbon Steel, Alloy Steel, Stainless Steel

Carbon Steel, Alloy Steel, Stainless Steel


Summary of flange sizes specified by ASME B16.5 and B16.47 standards:

Flange Type

Specifications

ASME B16.5

ASME B16.47 Series A(MSS SP-44)

ASME B16.47 Series B(API 605)

Nominal Pipe Size

<NPS 26

≥NPS 26

≥NPS 26

Nominal Pressure(Class)

Class (lb)

Class (lb)

Class (lb)

Weld Neck Flange

150-2500

150-900

75-900

Slip on Flange

150-1500

Blind Flange

150-2500

300-900

300-900

Lap Joint Flange

150-2500

Socket Weld Flange

150-1500

Threaded Flange

150-2500

Flat/raised Face

As above

As above

As above

Ring Joint Face

150-2500

300-900

300-900

Other Face

150-2500

Notes:

  1. MSS SP-44 flanges are designated Series A flanges in ASME B16.47.It also covers flanges in the range NPS 12 to 24,
    these being equivalent to ASME B16.5 flanges in the same range (except for the addition of NPS 22 in MSS SP-44).

  2. API 605 has been cancelled. API 605 flanges are designated Series B flanges in ASME B16.47. Ranges quoted are based on ASME B16.47 Series B.

  3. Dimensions not covered in this summary


ASME B16.5 Size Range

The nominal size range is relatively wide, from NPS 1/2 (about 15mm) to NPS 24 (about 600mm). This size range can meet the needs of most conventional piping systems, whether it is a small industrial device or a general-sized pipeline transportation system, you can find a flange of the right size.


ASME B16.47 Size Range

As mentioned earlier, its nominal size ranges from NPS 26 (about 660mm) to NPS 60 (about 1524mm), specifically for large diameter pipes.


ASME B16.5 Pressure Level

The pressure level ranges from Class 150 (about 2.0MPa) to Class 2500 (about 42.0MPa), covering different pressure ranges such as low, medium and high pressure. Different pressure levels correspond to different flange thicknesses, bolt specifications and sealing requirements to ensure reliable sealing and connection under the corresponding working pressure.


ASME B16.47 Pressure Level

The pressure level ranges from Class 75 (about 1.3MPa) to Class 900 (about 15.0MPa). Compared with the ASME B16.5 standard, its pressure level range is different and focuses more on the application of large diameter pipes under medium and low pressure conditions.


The flange types produced by ASME B16.5 and ASME B16.47 are different.


The ASME B16.5 standard includes flange types:

Butt welded flange (WN FLANGE),

Flat welded flange (SO FLANGE),

Socket flange (SW FLANGE),

Threaded flange (TH FLANGE),

Blind flange (BL FLANGE),

Loose flange (LAPJ FLANGE).

ASME B16.5 TYPE OF FLANGE

The ASME B16.47 standard includes flange types: butt welded flange (WN FLANGE) and blind flange (BL FALNGE).



Minimum
Thickness    of
Flange ,tf
[Note(1)]





Drilling



Length   of
Bolts ,L
[Notes   (4),(5)]

Nominal
 Pipe
Size

0.D.of
 Flange ,
0

WNF

Blind

Length
ThroughHub,Y

Diam.of
Hub,X
[Note(2)1]

Hub
 Diam.
  Top.A
[Note(3)]

Raised
Face
Diam.
R


Diam.
 of Bolt
Circle

No.of o
Bolt
Holes


Diam.
Bolt
Hole,
in.

Diam.
of
Bolt,
in.

Minimum
Fillet
Radius,r1

StudBolts
Raised
Face
1.6mm

26

870

66.8

66.8

119

676

660.4

749

806.4

24

1 3/8

1 1/4

10

225

28

927

69.8

69.8

124

727

711.2

800

863.6

28

1 3/8

1 1/4

11

230

30

984

73.2

73.2

135

781

762.0

857

914.4

28

1 3/8

1 1/4

11

235

32

1060

79.5

79.5

143

832

812.8

914

977.9

28

1 5/8

1 1/2

11

265

34

1111

81.0

81.0

148

883

863.6

965

1028.7

32

1 5/8

1 1/2

13

270

36

1168

88.9

88.9

156

933

914.4

1.022

1085.8

32

1 5/8

1 1/2

13

285

38

1238

85.9

85.9

156

991

965.2

1073

1149.4

32

1 5/8

1 1/2

13

280

40

1289

88.9

88.9

162

1.041

1016.0

1124

1200.2

36

1 5/8

1 1/2

13

285

42

1346

95.2

95.2

170

1092

1066.8

1194

1257.3

36

1 5/8

1 1/2

13

300

44

1403

100.1

100.1

176

1143

1117.6

1245

1314.4

40

1 5/8

1 1/2

13

305

46

1454

101.6

101.6

184

1197

1168.4

1.295

1365.2

40

1 5/8

1 1/2

13

310

48

1511

106.4

106.4

191

1248

1219.2

1359

1422.4

44

1 5/8

1 1/2

13

320

50

1568

109.7

109.7

202

1.302

1270.0

1410

1479.6

44

1 7/8

1 3/4

13

340

52

1626

114.3

114.3

208

1353

1320.8

1461

1536.7

44

1 7/8

1 3/4

13

350

54

1683

119.1

119.1

214

1403

1371.6

1511

1593.8

44

1 7/8

1 3/4

13

360

56

1746

122.4

122.4

227

1457

1422.4

1575

1651.0

48

1 7/8

1 3/4

13

365

58

1803

127.0

127.0

233

1508

1473.2

1626

1708.2

48

1 7/8

1 3/4

13

380

60

1854

130.3

130.3

238

1559

1524.0

1676

1759.0

52

1 7/8

1 3/4

13

380


The ASME B16.47 standard is also divided into series A and series B.


The A series specifies the flange size for ordinary flanges, while the B series specifies the flange size for compact flanges.


The diameter of bolt holes on A series flanges is larger than that on B series flanges, and the number of bolt holes is less than that on B series flanges. The size of bolt holes of the B series flange are smaller than those of the A series flange, and the number of bolt holes is more than that of the A series flange.


ASME B16 47 Series A flanges are thicker, heavier, and stronger than their Series B counterparts. They also can often handle more external loading than Series B. Series A flanges tend to be more costly than Series B flanges.


ASME B16.47 Series B flanges need more but smaller fasteners, such as bolts & nuts. They also usually have a smaller bolt circle diameter than Series A flanges. Generally, there is less flange movement after installation due to the smaller bolt circle diameter.


Both Series A and B define weld neck flanges and blind flanges in raised face type. However, Series A defines ring-type joint (RTJ) flanges from Class 300 through Class 900 within this standard while Series B does not.


Series A flanges are popular for new pipeline projects or equipment. Meanwhile, many choose Series B flanges for refurbishment or replacement jobs.


Whichever choosing ASME B16.5 standard flanges or ASME B16.47 standard flanges, it is necessary to confirm the exact producing standard based on the specific application of the pipeline system.



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