METAL/SPIRAL WOUND GASKETS
Engineering Data/FAQs
Maximum Flange Bore for FLEXSEAL® Gaskets
| Flange Size (NPS) |
Pressure Class | |||||||
| 75 | 150 | 300 | 400 | 600 | 9001 | 15001 | 25001 | |
| 1/2" | No recommen- dation in 75 lb. flanges | Weld-neck only2 | No flanges. Use Class 600 | Weld-neck only2 | No flanges. Use Class 1500 | Weld-neck only2 | ||
| 3/4" | ||||||||
| 1" | ||||||||
| 1-1/4" | Slip-on3 Weld-neck2 |
Slip-on3 Weld-neck2 |
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| 1-1/2" | ||||||||
| 2" | Slip-on3 Weld-neck, any bore |
Slip-on3 Weld-neck, any bore |
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| 2-1/2" | ||||||||
| 3" | Slip-on, Weld-neck, any bore |
Slip-on, Weld-neck, any bore |  |
Weld-neck with Standard wall bore (includes nozzle4 but excludes Slip-on) | ||||
| 4" | Weld-neck with Schedule 10S bore described in ASME B36.19M (includes nozzle4 but excludes Slip-on) | |||||||
| 6" | ||||||||
| 8" |  |
Weld-neck w/ Schedule 60 bore | ||||||
| 10" | ||||||||
| 12" | Weld-neck w/ Schedule 80 bore | |||||||
| 14" | Weld-neck with Schedule 10 bore described in ASME B36.10M (excludes nozzle4 and Slip-on5) | Weld-neck w/ Standard wall bore (excludes nozzle and Slip-on) | No flanges | |||||
| 16" | ||||||||
| 18" | ||||||||
| 20" | ||||||||
| 24" | Weld-neck w/ Sched. 40 bore | |||||||
NOTES:
- Inner rings should be used for Class 900 gaskets, NPS 24; Class 1500 gaskets, NPS 12 thru NPS 24; and Class 2500 gaskets, NPS 4 thru 12 (see ASME B16.5, 3.2.5). These inner rings may extend into the pipe bore a maximum of 0.06" (1.5 mm) under the worst combination of maximum bore, eccentric installation, and additive tolerances. Purchaser should specify inner ring material.
- In these sizes the gasket is suitable for a weld-neck flange with a standard wall bore, if the gasket and the flange are assembled concentrically. This also applies to a nozzle. It is the user's responsibility to determine if the gasket is satisfactory for the flange of any larger bore.
- Gaskets in these sizes are suitable for slip-on flanges only if the gaskets and flanges are assembled concentrically.
- A nozzle is a long welded neck; the bore equals the flange NPS.
- An NPS 24 gasket is suitable for nozzles.
WARNING:
Properties/application shown here are typical. Your specific application
should not be undertaken without independent study and evaluation for
suitability. For specific application recommendations consult Garlock.
Failure to select the proper sealing products could result in property
damage and/or serious personal injury.
Performance data published here has been developed from field testing, customer field reports and/or in-house testing.
While the utmost care has been used in compiling this information, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancels all previous issues. Subject to change without notice.