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SPECIFICATION · #193

B16.47 B Class 300 38″ Blind

ASME B16.47 Series B · ASME B16.47-2025 · DN950

B16.47 BClass 300BlindUnits mm / kg
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Dimension drawing

Schematic, drawn from the table values
ASME B16.47 Series B · 38″ (DN950) · Class 300 · Blind FlangeASME B16.47 Series B · 38″ (DN950) · Class 300 · Blind Flange O.D. D 1222.0 Bolt circle K 1140.0 36×Ø44.5 Raised face Ø 1060.0 Thickness C 109.5 RF height f 1.5 Both views share one scale (1:17); 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 300
DOutside diameter1222mm
CFlange thickness / blind thickness109.5mm
D2Raised face diameter1060mm
fRaised face height1.5mm
KBolt circle diameter1140mm
nNumber of bolt holes36pcs
dBolt hole diameter44.5mm
Approximate weight1024kg
Data edition ASME B16.47-2025Verified 2026-11-04

Pressure–temperature ratings

Group 1.1
≤ 38 °C51.0 bar50 °C49.8 bar100 °C46.7 bar150 °C45.1 bar200 °C43.8 bar250 °C42.0 bar300 °C39.9 bar325 °C38.7 bar350 °C37.6 bar375 °C36.4 bar400 °C34.6 bar425 °C28.7 bar450 °C23.0 bar475 °C17.5 bar500 °C11.5 bar538 °C5.8 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 1124Class 400D 1206Class 600D 1270Class 900D 1460

Same size and rating · other types

Weld NeckC 109.5

Adjacent sizes · Class 300

← 36″DN90038″ · DN95040″ →DN1000

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 #193 · 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.