ASME B16.48 Paddle blind Spacer ring spectacle blind Hastelloy B2
1. More information about Hastelloy B2
Hastelloy B2 is a nickel-base wrought alloy with excellent
resistance to hydrochloric acid at all concentrations and
temperatures. Therefore, it has great resistance to
stress-corrosion cracking and pitting. Hastelloy B-2 also features
hydrochloric acid resistance at all concentrations and
temperatures.
Available forms of Hastelloy B-2® are seamless pipe, welded pipe,
seamless tube, welded tube, bar, wire, sheet, plate, forgings, pipe
fittings and flanges.
Hastelloy B-2 Applications
Hastelloy B-2 has many different industrial applications, some of
which include:
- Chemical process applications
- Vacuum furnaces
- Mechanical components in reducing environments
Alloy B2 - UNS N10665
Common Trade Names: Hastelloy B2, Nimofer 6928
Hastelloy Alloy B2 paddle blind Chemical Composition
| Grade | C | Mn | Si | S | Co | Ni | Cr | Fe | Mo | P |
| B2 | 0.010 max | 1.00 max | 0.08 max | 0.03 max | 2.50 max | 50.99 min* | 14.50 – 16.50 | 4.00 – 7.00 | 15.00 – 17.00 | 0.04 max |
Hastelloy B2 spacer ring Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Hastelloy B2 | 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 1,15,000 , MPa – 790 | Psi – 52,000 , MPa – 355 | 40 % |
Equivalent Grades for B2 Hastelloy spectacle blind
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN | OR |
| Hastelloy B2 | 2.4617 | N10665 | NW 0276 | ХН65МВУ | NiMo16Cr15W | ЭП760 |
2. Hastelloy B2 spectacle blind
Spectacle Blinds are generally applied to permanently separating
pipesystems, or just to connect with each other. A Spectacle Blind
is a steel plate cut into two discs of a certain thickness.
The two discs are attached to each other by section of steel
similar to the nose piece of a pair of glasses. One of the discs is
a solid plate, and the other is a ring, whose inside diameter is
equal to that of a flange.
Spectacle Blinds be applied in systems, which regularly need to be
separated from other installations. Normally, a Spectacle Blind is
mounted in the "open" position so that flow through the pipe is
possible. If the Spectacle Blind in the "close" position is
rotated, the pipe is blanked off and no flow is possible.
Maintenance on a pipesystem can be a reason to rotate the spectacle
in the "close" position. This run will take place through the hole,
that is drilled in the connection piece. By loosening of all bolts,
and partial removal of their, the Spectacle Blind can be rotated.
After replacing the gaskets (new gaskets are to recommend), the
bolts can be re-assembled and tightened.
3. Hastelloy B2 Spades and Ring Spacers
SPADES
Spades and Ring Spacers are basically the same as Spectacle Blinds,
except that both are not attached to each other.
Spades and Spacers be applied in systems where maintenance is often
not necessary, or in applications with large pipe sizes. Depending
on the flange size and the Pressure Class, Spades can weigh
hundreds of pounds. To prevent unnecessary weight to a flange
connections, usually will be chosen not for a Spectacle Blind, but
for 2 separate parts.
RING SPACER
So as for the Spectacle Blind already described, maintenance on a
pipesystem can be a reason to temporarily replace a Ring Spacer for
a Spade. By loosening of all bolts, and half of the bolts
temporarily remove, the Spade or Spacer can be placed. After
replacing the gaskets (new gaskets are to recommend), the bolts can
be re-assembled and tightened.
A small problem is that we basically can not see, or a Spade or a
Spacer mounted between the flanges. Therefore the handles are often
specially marked, or both have a different design; a customer often
provides its own specification.
What should never lack is, that in the handle, the diameter and the
Pressure Class of a Spade or Spacer is engraved; this applies also
for the Spectacle Blind.
4. Hastelloy B2 spectacle blind, spacer ring, paddle blind actual
application
