BS 4504 Standard Flanges Type code,PN range and Marking Requirements

PDF:BS 4504 Standard Flanges Type code PN range Marking Requirements

BS 4504 Standard Flanges Type code,PN range and Marking Requirements.

Summary of flanges covered by BS 4504 : Section 3.1.

Code No.

Description

PN Range

DN Range

101

Plate flange for welding(see page 8-65)

PN 2.5

DN 10 to DN 2000

PN 6, 10, 16, 25, 40

DN 10 to DN 600

102

Loose plate flange with weld-on plate collar or for lapped pipe end (Weld-on plate collar = Code 1321 Lapped pipe end = Code 1331)

PN 6, 10, 16, 25, 40

DN 10 to DN 600

104

Loose plate flange with weld-neck collar (Weldneck collar = Code 1341)

PN 6, 10, 16, 25, 40

DN 10 to DN 600

   

PN 2.5, 6

DN 10 to DN 2000

105

Blank flange (see page 8-70)

PN 10, 16

DN 10 to DN 1200

   

PN 25, 40

DN 10 to DN 600

   

PN 2.5, 6, 10, 16

DN 10 to DN 20002

111

Weld-neck flange (see page 8-66)

PN 25

DN 10 to DN 1000

   

PN 40

DN 10 to DN 600

112

Hubbed slip-on flange for welding(see page 8-68)

PN 6

DN 10 to DN 300

PN 10, 16, 25, 40

DN 10 to DN 600

113

Hubbed threaded flange (see page 8-69)

PN 6, 10, 16, 25, 40

DN 10 to DN 150

121

Integral flange

PN 6, 10, 16, 25

DN 10 to DN 2000

PN 40

DN 10 to DN 600

Note:

-Flanges > DN 2000, are not covered in this summary.

-Dimensions: Nominal sizes, DN followed by a numerical designation of size (a convenient round number for reference purposes), are used as defined in ISO 6708.

-Pressure Ratings: Nominal pressures, i.e. PN followed by a numerical designation of size (a convenient round number for reference purposes), are used as defined in ISO 7268.

1 Dimensions for these flanges are not covered in this summary.

2 The DN range for weld neck flanges extends to DN 4000 for PN 2.5, to DN 3600 for PN 6, and to DN 3000 for PN 10.

Designations/Marking

Marking. All flanges are marked with BS number, code number,PN,DN,material designation,manufacturers name or trade mark,cast number or melt identification,thread identification,An example follows:

BS 4504/111/B – PN 16 -DN 400 -B4 – XXX – 12345.

BS-4504-FLANGE-MARKING-REQUIREMENT

BS-4504-FLANGE-MARKING-REQUIREMENT

Cast Number or melt identification Manufacturer’s name or trade mark Material designation Nominal size, DN

Nominal Pressure, PN Flange face type (A – H) Flange code number British standard number

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