Model B Flange Sight Glass
Threaded lens retainer cap · ANSI B16.5 flange connection
About Model B
The Model B Flange unit with threaded lens retainer cap mounts on standard ANSI B16.5 (2" to 24") flange accommodations. Units can be manufactured to meet your pressure and temperature requirements, and different materials of construction are available to meet your process needs.
Applications requiring DIN standards or non-ANSI flanges are available upon request.
- Connection
- ANSI B16.5 flange
- Product size range
- 2–24 inches; dimensions below cover 2–8 inches
- Standard lens
- Two-piece laminated tempered soda lime
- Other Model B connection
- Model B Weld sight glass
Construction and material options
- 1Flange
- 316 Stainless Steel SA-182; 304 Stainless Steel SA-182; Carbon Steel SA-105
- 2Retainer cap
- 316 Stainless Steel SA-351; 304 Stainless Steel SA-351; Carbon Steel SA-519
- 3Compression ring
- 304 Stainless Steel SA-351; Carbon Steel SA-519
- 4Lens
- Two-Piece Laminated Tempered Soda Lime (Standard); Tempered Borosilicate; Annealed Borosilicate; Quartz; Lexan; Acrylic; Mica shields
- 5Lens cushion gaskets
- Teflon®; Grafoil®; Gylon®; Blue-Gard®; other materials on request
- 6Lens packing
- Combination Teflon® Impregnated and Viton® (Standard); Graphite; FDA Teflon®; other materials on request
- 7Compression screws
- 18-8 Stainless Steel; Carbon Steel SA-193 — by request
Engineering dimensions — inches
Use the drawing letters with the table below. Size and rating are shown as inches–psi, as shown in the engineering sheet.
For other sizes, DIN or non-ANSI flange connections, select a custom requirement in the options below.
Open the original engineering sheet
| Size–psi | O.D. | A | T | R.F. | J | H | X | Bolt holes — qty | Bolt hole dia. | Bolt circle dia. |
|---|---|---|---|---|---|---|---|---|---|---|
| 2–150 | 6 | 1 3/4 | 3/4 | 3 5/8 | 1 15/16 | 2 1/2 | 3 1/2 | 4 | 3/4 | 4 3/4 |
| 2–300 | 6 1/2 | 1 3/4 | 7/8 | 3 5/8 | 1 15/16 | 2 1/2 | 3 5/8 | 8 | 3/4 | 5 |
| 2–600 | 6 1/2 | 1 3/4 | 1 | 3 5/8 | 1 15/16 | 2 1/2* | 3 5/8 | 8 | 3/4 | 5 |
| 3–150 | 7 1/2 | 2 5/8 | 15/16 | 5 | 2 7/8 | 2 1/2 | 4 5/8 | 4 | 3/4 | 6 |
| 3–300 | 8 1/4 | 2 5/8 | 1 1/8 | 5 | 2 7/8 | 2 1/2 | 4 7/8 | 8 | 7/8 | 6 5/8 |
| 3–600 | 8 1/4 | 2 5/8 | 1 1/4 | 5 | 2 7/8 | 2 3/4* | 4 7/8 | 8 | 7/8 | 6 5/8 |
| 4–150 | 9 | 3 5/8 | 15/16 | 6 3/16 | 3 3/4 | 2 1/2 | 5 7/8 | 8 | 3/4 | 7 1/2 |
| 4–300 | 10 | 3 5/8 | 1 1/4 | 6 3/16 | 3 3/4 | 2 3/4 | 6 | 8 | 7/8 | 7 7/8 |
| 4–600 | 10 3/4 | 3 5/8 | 1 1/2 | 6 3/16 | 3 3/4 | 3 1/2* | 6 1/4 | 8 | 1 | 8 1/2 |
| 6–150 | 11 | 5 1/2 | 1 | 8 1/2 | 5 3/4 | 3 | 8 | 8 | 7/8 | 9 1/2 |
| 6–300 | 12 1/2 | 5 1/2 | 1 7/16 | 8 1/2 | 5 3/4 | 3 1/2 | 8 3/8 | 12 | 7/8 | 10 5/8 |
| 6–600 | 14 | 5 1/2 | 1 7/8 | 8 1/2 | 5 3/4 | 4* | 8 5/8 | 12 | 1 1/8 | 11 1/2 |
| 8–150 | 13 1/2 | 7 3/8 | 1 1/8 | 10 5/8 | 7 11/16 | 3 1/2 | 10 1/4 | 8 | 7/8 | 11 3/4 |
| 8–300 | 15 | 7 3/8 | 1 5/8 | 10 5/8 | 7 11/16 | 3 3/4 | 10 1/2 | 12 | 1 | 13 |
* Height markers are retained exactly as printed in the original sheet; their meaning is not specified there. FM approval excludes 600 psi models.
Approvals and documentation
The original product documentation states:
This sight glass has been certified as maintaining a Quality Assurance System in accordance with the Pressure Equipment Directive 97/23/EC (PED) Annex I, Paragraph 4.3 by the Certification Body 0036 of the TÜV Industrie Service GmbH.
FM approval excludes 600 psi models.
Configure your Model B flange
Select a size and rating, or describe a custom connection. Material choices can be left for Sightflow to advise.