Graflex 2661/1661 Ring Gasket
Graflex 2661/1661 Ring Gasket
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Ring gaskets are a flat sealing element, consisting of an inner and outer diameter sized to fit a flange's bore and bolt circle. Ring gaskets sit inside the flange's bolt circle. ASME B16.21 and ASME B16.47 govern the dimensions of ring gaskets for standard and large diameter pipe flanges. Teadit 2661/1661 flexible graphite sheet has pressure-temperature sealability capabilities that are far superior to all compressed fiber reinforced sheet materials. It is resistant to chemical attack by virtually all organic and inorganic fluids with the exception of concentrated, highly oxidizing acids. Gaskets cut from 2661/1661 flexible graphite sheet seal with low to moderate bolt loads and because of very low creep relaxation, re-torquing is rarely required. Flexible graphite conforms to irregular flange sealing surfaces and readily flows into flange irregularities enabling it to seal both smooth and coarse surface finishes. 2661/1661 is a flexible graphite sheet reinforced with a 316SS foil, .002" thick. The flexible graphite sheet is made from exfoliated graphite flake which is compressed into foil by a carefully controlled calendaring process. In this process, the expanded flake particles are mechanically locked together without the use of fibers, binders or other additives. Sheets of graphite foil are then adhesive bonded and laminated to the required thickness with the 316SS foil core in the center.
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Physical Properties
| Typical Physical Properties: | |||
| Density | 62.4 lbs/ft^3 | ||
| Compressibility - Tested under 5000 psi | 35% | ||
| Recovery - Tested under 5000 psi | 18% | ||
| Tensile Strength Across Grain | 5000 psi | ||
| Creep Relaxation | 12% | ||
| Compressive Strength | 24,000psi | ||
| Carbon Content | 98% minimum | ||
| Total Sulfur | ≤750 ppm maximum | ||
| Leachable Chlorides | <30 ppm maximum | ||
Governing Standards
| ASME B16.21 | Covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets. |
| ASME B16.47 | Covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (Metric) and U. S. Customary units, with diameter of bolts and flange bolt hole expressed in inch units. |
Service Limits
| Temperature | Continuous Service: -328F (-200C) | |
| Maximum Service: | ||
| In air: 842F (450C) | ||
| In steam: 1202F (650C) | ||
| In reducing or inert media: 5432F (3000C) | ||
Dimensional Specifications
| Per ASME B16.21-2016 | |||||||||||||||||||||
| Pipe Diameter | |||||||||||||||||||||
| 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 3 1/2 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 | ||
| Inside Diameter | 0.84 | 1.06 | 1.31 | 1.66 | 2.38 | 2.38 | 2.88 | 3.50 | 4.00 | 4.50 | 5.56 | 6.63 | 8.63 | 10.75 | 12.75 | 14.00 | 16.00 | 18.00 | 20.00 | 24.00 | |
| Outside Diameter per Class |
150# | 1.88 | 2.25 | 2.62 | 3.00 | 3.38 | 4.12 | 4.88 | 5.38 | 6.38 | 6.88 | 7.75 | 8.75 | 11.00 | 13.38 | 16.13 | 17.75 | 20.25 | 21.62 | 23.88 | 28.25 |
| 300# | 2.12 | 2.62 | 2.88 | 3.25 | 3.75 | 4.38 | 5.12 | 5.88 | 6.50 | 7.12 | 8.50 | 9.88 | 12.12 | 14.25 | 16.62 | 19.12 | 21.25 | 23.50 | 25.75 | 30.50 | |
| 600# | 2.12 | 2.62 | 2.88 | 3.25 | 3.75 | 4.38 | 5.12 | 5.88 | 6.38 | 7.62 | 9.50 | 10.50 | 12.62 | 15.75 | 18.00 | 19.38 | 22.25 | 24.12 | 26.88 | 31.12 | |
| Per ASME B16.47-2017 | |||||||||||||||||||
| Series A | Pipe Diameter | ||||||||||||||||||
| 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 | 60 | ||
| Inside Diameter | 26.00 | 28.00 | 30.00 | 32.00 | 34.00 | 36.00 | 38.00 | 40.00 | 42.00 | 44.00 | 46.00 | 48.00 | 50.00 | 52.00 | 54.00 | 56.00 | 58.00 | 60.00 | |
| Outside Diameter per Class |
150# | 30.50 | 32.75 | 34.75 | 37.00 | 39.00 | 41.25 | 43.75 | 45.75 | 48.00 | 50.25 | 52.25 | 54.50 | 56.50 | 58.75 | 61.00 | 63.25 | 65.50 | 67.50 |
| 300# | 32.88 | 35.38 | 37.50 | 39.62 | 41.62 | 44.00 | 41.50 | 43.88 | 45.88 | 48.00 | 50.12 | 52.12 | 54.25 | 56.25 | 58.75 | 60.75 | 62.75 | 64.75 | |
| 600# | 34.12 | 36.00 | 38.25 | 40.25 | 42.25 | 44.50 | 43.50 | 45.50 | 48.00 | 50.00 | 52.26 | 54.75 | 57.00 | 59.00 | 61.25 | 63.50 | 65.50 | 67.75 | |
| Per ASME B16.47-2017 | |||||||||||||||||||
| Series B | Pipe Diameter | ||||||||||||||||||
| 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 | 60 | ||
| Inside Diameter | 26.00 | 28.00 | 30.00 | 32.00 | 34.00 | 36.00 | 38.00 | 40.00 | 42.00 | 44.00 | 46.00 | 48.00 | 50.00 | 52.00 | 54.00 | 56.00 | 58.00 | 60.00 | |
| Outside Diameter per Class |
150# | 28.56 | 30.56 | 32.56 | 34.69 | 36.81 | 38.88 | 41.12 | 43.12 | 45.12 | 47.12 | 49.44 | 51.44 | 53.44 | 55.44 | 57.62 | 59.62 | 62.19 | 64.19 |
| 300# | 30.38 | 32.50 | 34.88 | 37.00 | 39.12 | 41.25 | 43.25 | 45.25 | 47.25 | 49.25 | 51.88 | 53.88 | 55.88 | 57.88 | 61.25 | 62.75 | 65.19 | 67.12 | |
| 600# | 30.12 | 32.25 | 34.62 | 36.75 | 39.25 | 41.25 | |||||||||||||
- All dimensions are in inches.