Short Description

Model No.: ANSI-B16.5-ASTM-B381-Titanium-Blind-Flange

China Titanium Blind Flange Manufacturer www.steeljrv.com offers ANSI B16.5 ASTM B381 Titanium Blind Flange.

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Key Specifications / Features

Type: Titanium Blind Flange
Pressure: 150#-2500#
Size: 1/2”~80”(DN10~3600)
Material: Grade 1 (UNS R50250), Grade 2 (UNS R50400), Grade 5 (UNS R56400), Grade 7 (UNS R52400), Grade 9 (UNS R56320), Grade 12 (UNS R53400),etc
Flange Facing Type: RTJ/RF
Standards: ANSI / ASME B16.5

China Titanium Blind Flange Manufacturer www.steeljrv.com offers ANSI B16.5 ASTM B381 Titanium Blind Flange.

20200830021243 86716 - ANSI B16.5 ASTM B381 Titanium Blind Flange

Chemical Composition – Titanium Blind Flange

STANDARD CHEMICAL COMPOSITION (weight %, ma√ or range)
Grade UNS N C H Fe O Al V Pd Mo Ni
No
GR 1 R50250 0.03 0.08 0.015 0.2 0.18
GR 2 R50400 0.03 0.08 0.015 0.3 0.25
GR 3 R50550 0.05 0.08 0.015 0.3 0.35
GR 4 R50700 0.05 0.08 0.015 0.5 0.4
GR 5 R56400 0.05 0.08 0.015 0.4 0.2 5.5-6.75 3.5-4.5
GR 7 R52400 0.03 0.08 0.015 0.3 0.25 0.12-0.25
GR 9 R56320 0.03 0.08 0.015 0.25 0.15 2.5-3.5  2.0-3.0 
GR 12 R53400 0.03 0.08 0.015 0.3 0.25 0.2-0.4 0.6-0.9
GR 23 R56401 0.03 0.08 0.0125 0.25 0.13 5.5-6.5 3.5-4.5

Mechanical & Physical Properties – Titanium Blind Flange

STANDARD CHEMICAL COMPOSITION (weight %, ma√ or range) MECHANICAL PROPERTIES (min)
Grade UNS Tensile Yield El. Red.
No Mpa Mpa % %
GR 1 R50250 240 138 24 30
GR 2 R50400 345 275 20 30
GR 3 R50550 450 380 18 30
GR 4 R50700 550 483 15 25
GR 5 R56400 895 828 10 25
GR 7 R52400 345 275 20 30
GR 9 R56320 620 483 15 25
GR 12 R53400 483 345 18 25
GR 23 R56401 828 759 10 15

Dimensions of ANSI/ASME B16.5 Class 1500 Blind Flanges RTJ (IN)

  • Dimensions per ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.

20200830023656 24563 - ANSI B16.5 ASTM B381 Titanium Blind Flange

Pipe Size

(NPS)

Outside Diameter of Flange

A

Thickness of Flange

C

Diameter of Raised Face

T

Diameter of Groove

U

Groove Width

W

Groove Depth

X

Number of Bolt Holes

 

Diameter of Bolt Holes

 

Bolt Circle Diameter

P

1/2 4 3/4 7/8 2 3/8 1 9/16 11/32 1/4 4 7/8 3 1/4
3/4 5 1/8 1 2 5/8 1 3/4 11/32 1/4 4 7/8 3 1/2
1 5 7/8 1 1/8 2 13/16 2 11/32 1/4 4 1 4
1 1/4 6 1/4 1 1/8 3 3/16 2 3/8 11/32 1/4 4 1 4 3/8
1 1/2 7 1 1/4 3 5/8 2 11/16 11/32 1/4 4 1 1/8 4 7/8
2 8 1/2 1 1/2 4 7/8 3 3/4 15/32 5/16 8 1 6 1/2
2 1/2 9 5/8 1 5/8 5 3/8 4 1/4 15/32 5/16 8 1 1/8 7 1/2
3 10 1/2 1 7/8 6 5/8 5 3/8 15/32 5/16 8 1 1/4 8
3 1/2
4 12 1/4 2 1/8 7 5/8 6 3/8 15/32 5/16 8 1 3/8 9 1/2
5 14 3/4 2 7/8 9 7 5/8 15/32 5/16 8 1 5/8 11 1/2
6 15 1/2 3 1/4 9 3/4 8 5/16 17/32 3/8 12 1 1/2 12 1/2
8 19 3 5/8 12 1/2 10 5/8 21/32 7/16 12 1 3/4 15 1/2
10 23 4 1/4 14 5/8 12 3/4 21/32 7/16 12 2 19
12 26 1/2 4 7/8 17 1/4 15 29/32 9/16 16 2 1/8 22 1/2
14 29 1/2 5 1/4 19 1/4 16 1/2 1 1/16 5/8 16 2 3/8 25
16 32 1/2 5 3/4 21 1/2 18 1/2 1 3/16 11/16 16 2 5/8 27 3/4
18 36 6 3/8 24 1/8 21 1 3/16 11/16 16 2 7/8 30 1/2
20 38 3/4 7 26 1/2 23 1 5/16 11/16 16 3 1/8 32 3/4
22
24 46 8 31 1/4 27 1/4 1 7/16 13/16 16 3 5/8 39

PT – penetration testing

This method is used for detection of welding discontinuities (material discontinuities) appearing on the surface of a welded connector. This test is done following a visual testing of a welded connector and used mainly for both ferromagnetic and non-ferromagnetic materials.

20181091828401311297 1 - ANSI B16.5 ASTM B381 Titanium Blind Flange

What is ASME B16.5 RTJ Flange?

Construction & Characteristics

The ASME B16.5 RTJ flanges refers to pipe flanges manufactured in accordance with ASME B16.5 furnished with a ring-type joint facing. The ring-type joint facing, also known simply as ring joint facing, is an additional raised portion furnished to various flange types to form a one-piece flange. A deep ring-shaped groove shall be cut into the flange contact surface. Instead of conventional flat or spiral wound gaskets, a metallic ring gasket with oval or octagonal cross section is used to rest in the deep groove. As the bolts are tightened, the metallic ring is compressed, creating a tight seal.

rtj flg face - ANSI B16.5 ASTM B381 Titanium Blind Flange

Figure-1: the typical drawing of an ASME B16.5 flange with a ring-type joint (RTJ) facing.

The seal between two RTJ flanges is made by plastic deformation of the RTJ gasket into the groove of the flange, resulting in intimate metal-to-metal contact between the ring gasket and the flange groove. The faces of the two opposing RTJ flanges in connection don not come into contact because a gap is maintained by the presence of the ring gasket. The approximate distance between the two flanges are denoted as “h” in Figure-2.

Flange Types, Pressure Ratings & RTJ Groove

RTJ flanges manufactured in accordance with ASME B16.5 may be provided in various flange types covering welding neck, slip on, socket welding, threaded, blind, long weld neck, and reducing type. They are available in pressure ratings Class 150 through Class 2500. The RTJ facing shall be additional to the minimum flange thickness. The bottom of the ring joint groove shall be in the same plane as the flange edge of a full thickness flange. The ring joint grooves for ASME B16.5 flanges cover a series of groove number ranging from 11 to 79. Since the use of RTJ flanges requires the use of ring joint gaskets. The groove numbers are corresponding to the metallic ring numbers. The metallic ring gaskets shall be fabricated in accordance with ASME B16.20. The side wall surface finish of the gasket groove in the flange shall not exceed 1.6 μm roughness.

Advantages & Disadvantages

The RTJ flange is considered to be the most efficient flange used in process piping systems. The ring and groove design actually uses internal pressures to enhance the sealing capacity of the connecting flanges. Higher the working pressure in the piping system, better the sealing performance. They are specifically applicable to severe services involving high pressures, high temperatures, cyclic stresses & temperatures, low temperatures, and corrosive fluids, etc.

rtj flg joint - ANSI B16.5 ASTM B381 Titanium Blind Flange

Figure-2: a RTJ joint consisting of two RTJ flanges and a metallic ring gasket which rests in the ring-joint groove.

The most obvious disadvantage of a ring type joint is that this configuration is most expensive. The precise control of machining both the metallic ring gasket and the ring-joint groove in the flange is very costly. Besides, when dismantling ring joint connections, the flange must be forcibly separated to release the ring from the groove. This may require considerable space. In crowded installations, this could cause major problems. Because of this, the ring joint flange is relegated to applications where space for maintenance and replacement are adequate.

Dimensions & Tolerances

As illustrated in Figure-1 and Figure-2, the dimensions of the ring joint facing of ASME B16.5 flanges are denoted as:

  • P – pitch diameter of groove;
  • G – minimum diameter of raised portion;
  • F – upper width of groove; r – radius at bottom of groove;
  • E – depth of groove, equal to height of raised portion;
  • h – approximate distance between flanges;
  • 23°: slope angle of side wall.

The tolerances for these dimensions are:

  • E (+0.40 mm, -0.00 mm);
  • F (±0.20 mm); P (±0.013 mm);
  • If r ≤ 2 mm, (+0.8 mm, -0.0 mm);
  • If r > 2, (±0.8 mm);
  • 23° angle (±0.5°).

Summary
ansi b16 5 f316 blind flange rtj 4 inch 1500 - ANSI B16.5 ASTM B381 Titanium Blind Flange
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Name
ANSI B16.5 ASTM B381 Titanium Blind Flange
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