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Design
Specifications
Paddle blanks, spacers and spectacle blinds may be
purchased using carbon steel, 304 SS, 316 SS or any material
which the customer may specify. Also several finishes are available
as follows: smooth mill machined or serrated finish. All of
our blanks are produced according to the thickness required
in the ASME Code, B31.3-1987 edition. Regarding blanks section
304.5.3 specifies that the plate thickness shall be equal
to
where d = inside
diameter
of gasket, P = design pressure, SE = allowable stress. Our
blanks are designed to withstand any pressure-temperature
combination listed in the ASA B16.5 flange design specifications.
All ring joint dimensions and tolerances are in accordance
with ASA B16.5 and B16.20. Octagonal rings are furnished unless
oval rings are specified on male ring joint blanks. All blanks
may be ordered with an eye-bolt welded to one end of the spectacle
blind for support during installation.
Please contact our engineering department for custom design
blanks. Our computerized stress analysis programs are always
ready to meet our client needs.
Materials:
Normally A 285 Gr C plate is furnished for carbon steel up
to and sometimes through 2" thickness; A 515 Gr 70 plate,
A 181 Class I or II forging, and A 105 Class I or II forging
are normally furnished for high pressures or large line blinds.
Other carbon steel, low-alloy steel, stainless steel, or practically
any alloy can be furnished.
Delivery:
Advise delivery required because sometimes plate can
be used for a 2 to 4 week delivery. Forgings for say a 8 week
delivery at a lower price than plate can be supplied, particularly
on blinds 2" and over in thickness.
Notes:
- Practically
any alloy or special line blind can be furnished
- Carbon
steel blinds have one shop coat of paint
- Tie
bar and handle thickness is one half of blind thickness
(minimum approximately)
- On
all alloy blinds, handles and tie bars are carbon steel
unless specifically requested.
- All
blinds and spacers shown fit ASA B16.5 flanges. J dimension
on male octagonal blind is 1/16" more than half of the height
of an octagonal ring joint gasket
- Sizes
1/2" through 48" and larger can be furnished
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