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SPECIFICATION · #303

B16.47 B Class 400 54″ Weld Neck

ASME B16.47 Series B · ASME B16.47-2025 · DN1350

B16.47 BClass 400Weld NeckUnits mm / kg
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Dimension drawing

Schematic, drawn from the table values
ASME B16.47 Series B · 54″ (DN1350) · Class 400 · Weld Neck FlangeASME B16.47 Series B · 54″ (DN1350) · Class 400 · Weld Neck Flange O.D. D 1702.0 Bolt circle K 1581.2 28×Ø66.7 Raised face Ø 1470.0 Thickness C 169.9 RF height f 6.4 Length H 289.0 Hub Ø A 1425.0 Weld end Ø 1371.6 Both views share one scale (1:24); schematic only Unit: mm

D outside diameter · K bolt circle · n×Ød bolt holes · C thickness · D2 raised face · f raised-face height · A hub diameter · H length

Dimensions

B16.47 B · Class 400
DOutside diameter1702mm
CFlange thickness / blind thickness169.9mm
D2Raised face diameter1470mm
fRaised face height6.4mm
KBolt circle diameter1581.2mm
nNumber of bolt holes28pcs
dBolt hole diameter66.7mm
AHub diameter1425mm
HHub length / overall length289mm
BWelding-end diameter1371.6mm
Data edition ASME B16.47-2025Verified 2026-11-04

Pressure–temperature ratings

Group 1.1
≤ 38 °C68.0 bar50 °C66.4 bar100 °C62.3 bar150 °C60.1 bar200 °C58.4 bar250 °C56.0 bar300 °C53.2 bar325 °C51.6 bar350 °C50.2 bar375 °C48.5 bar400 °C46.2 bar425 °C38.3 bar450 °C30.6 bar475 °C23.3 bar500 °C15.4 bar538 °C7.7 bar

Current material group: Group 1.1

Source: Table 3 (p. 14) — pressure–temperature ratings for Group 1.1 materials, SI units

Maximum allowable working pressure in bar at the listed metal temperature. Temperatures at or below 38 °C use the 'min. to 38' row. Linear interpolation is permitted between listed temperatures; interpolation between classes is not permitted. '—' records a cell for which the standard prints no rating ('...').

Material & standard

B16.47 B
Standard
ASME B16.47 Series B (ASME B16.47-2025)
Base material
ASTM A105
Material options
ASTM A105 / A105NASTM A350 LF2ASTM A182 F304/F316LASTM A694 F52/F60/F65ASTM A182 F51/F53
Region
North America, Middle East

Series B follows the former API 605 dimensions, with a smaller outside diameter and a different bolt pattern from Series A. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressure from the B16.47 tables.

Dimension values on this page have been checked against ASME B16.47-2025 (SI tables, cross-checked against the U.S. Customary tables). The 2025 edition prints exact metric equivalents of the inch dimensions rather than the old 5 mm-rounded values (for example 36.50 in is printed as 927 mm, not 925 mm), and defines flange thickness as excluding the raised face. Both corrections are reflected here; Series B NPS 38 and above follows Series A per the standard’s General Note (h).

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RELATED

Related specifications

Same size · other pressure classes

Class 150D 1549Class 300D 1673Class 600D 1778

Same size and rating · other types

BlindC 171.5

Adjacent sizes · Class 400

← 52″DN130054″ · DN135056″ →DN1400

Data note

Dimension values on this page have been checked against ASME B16.47-2025 (SI tables, cross-checked against the U.S. Customary tables). The 2025 edition prints exact metric equivalents of the inch dimensions rather than the old 5 mm-rounded values (for example 36.50 in is printed as 927 mm, not 925 mm), and defines flange thickness as excluding the raised face. Both corrections are reflected here; Series B NPS 38 and above follows Series A per the standard’s General Note (h).

Specification #303 · last updated 2026-11-05 08:05

Use limits

This library is a factual compilation of published standards tables. It does not replace the standard text. Verify against the edition in your purchase specification before quoting, manufacturing or inspecting a critical part.