Available Gasket Stress vs. Bolt Stress 300# Flat Face Flanges This table is for information purposes only; see notes below
Nom. 30,000 psi Pipe Number Size Bolt Gasket Size of of Bolts Torque Stress (inches) Bolts (inches) (ft. lbs.) (psi)
0.5 0.75 1 1.25 1.5 2 2.5 3 3.5 4 5 6 8 10 12 14 16 18 20 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
4 4 4 4 4 8 8 8 8 8 8 12 12 16 16 20 20 24 24 24 28 28 28 28 28 32 32 32 32 32 28 32 32 32 28 28 32 32
0.50 0.63 0.63 0.63 0.75 0.63 0.75 0.75 0.75 0.75 0.75 0.75 0.88 1.00 1.13 1.13 1.25 1.25 1.25 1.50 1.63 1.63 1.75 1.88 1.88 2.00 1.50 1.62 1.62 1.75 1.88 1.88 2.00 2.00 2.25 2.25 2.25 2.25
30 60 60 60 100 60 100 100 100 100 100 100 160 245 355 355 500 500 500 800 1,100 1,100 1,500 2,000 2,000 2,200 800 1,100 1,100 1,500 2,000 2,000 2,200 2,200 3,180 3,180 3,180 3,180
1,632 1,650 1,506 1,328 1,428 1,924 2,124 1,798 1,525 1,226 1,099 1,341 1,357 1,928 1,841 1,808 1,924 2,016 1,728 1,909 2,562 2,272 2,491 2,703 2,493 3,058 2,921 3,026 2,878 3,077 2,800 3,119 3,287 3,156 3,095 2,981 3,346 3,230
Bolt Stress 60,000 psi Bolt Gasket Torque Stress (ft. lbs.) (psi) 60 120 120 120 200 120 200 200 200 200 200 200 320 490 710 710 1,000 1,000 1,000 1,600 2,200 2,200 3,000 4,000 4,000 4,400 1,600 2,200 2,200 3,000 4,000 4,000 4,400 4,400 6,360 6,360 6,360 6,360
Notes: The values shown are not recommended values. The intent of this table is to illustrate the relationship between bolt torque, bolt stress, gasket stress, and how these three factors relate to the contact area of ASME B16.5 & B16.47 Series A flat face flanges. 2 Full face gaskets will typically seal at stresses well below the minimum recommended values shown. See also “Flanges” on page C-50. 3 Contact Garlock Applications Engineering at 1-800-448-6688 for further discussions regarding the use of compressed non-asbestos, GYLON® or GRAPH-LOCK® products in flat face flanges. 1
C-46
75,000 psi Bolt Gasket Torque Stress (ft. lbs.) (psi)
3,264 3,300 3,013 2,656 2,857 3,848 4,247 3,597 3,051 2,453 2,198 2,682 2,714 3,855 3,682 3,615 3,847 4,031 3,457 3,818 5,124 4,544 4,982 5,406 4,987 6,115 5,841 6,052 5,756 6,155 5,600 6,237 6,574 6,311 6,190 5,963 6,693 6,460
75 150 150 150 250 150 250 250 250 250 250 250 400 613 888 888 1,250 1,250 1,250 2,000 2,750 2,750 3,750 5,000 5,000 5,500 2,000 2,750 2,750 3,750 5,000 5,000 5,500 5,500 7,950 7,950 7,950 7,950
4,081 4,125 3,766 3,319 3,571 4,810 5,309 4,496 3,813 3,066 2,748 3,352 3,393 4,819 4,602 4,519 4,809 5,039 4,321 4,773 6,405 5,680 6,228 6,758 6,234 7,644 7,301 7,566 7,194 7,693 7,000 7,796 8,217 7,889 7,737 7,453 8,366 8,075
Minimum Recommended Assembly Stress 1/32" 1/16" 1/8" Thick Thick Thick (psi) (psi) (psi) 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 4,800 5,000 — — — — — — — — — — — — — — — — — —
5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,400 5,600 6,171 6,193 6,247 6,299 6,336 6,378 7,365 7,286 7,378 7,369 7,323 7,441 7,428 7,506 7,372 7,443 7,552 7,623
6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 6,400 7,171 7,193 7,247 7,299 7,336 7,378 8,365 8,286 8,378 8,369 8,323 8,441 8,428 8,506 8,372 8,443 8,552 8,623
WARNING:
Properties/applications shown throughout this brochure 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 in this brochure has been developed from field testing, customer field reports and/or in-house testing.
While the utmost care has been used in compiling this brochure, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancels all previous issues. Subject to change without notice. GARLOCK is a registered trademark for packings, seals, gaskets, and other products of Garlock.