"M" and "Y" Data "M" and "Y" data are to be used for flange designs only as specified in the ASME Boiler and Pressure Vessel Code Division 1, Section VIII, Appendix 2. They are not meant to be used as gasket seating stress values in actual service. Our bolt torque tables give that information and should be used as such.
Style
Thickness M
1/16" 11.4* 1/8" 22.0* 3000 1/16" 4.2 1/8" 5.2 3123 / 3125 1/16" 2.0 1/8" 2.0 3124 1/16" 2.0 (Wire-inserted) 1/8" 2.0 3125SS 1/16" 6.5 1/8" 11.8* 3125TC 1/16" 2.6 1/8" 6.0 3200 / 3400 1/16" 3.5 1/8" 6.6 3300 1/16" 2.1 1/8" 4.0 3500 1/16" 5.0 1/8" 5.0 3504 1/16" 3.0 1/8" 2.5 3/16" 2.5 1/4" 2.5 3510 1/16" 2.0 1/8" 2.0 3530 1/16" 2.8 1/8" 2.0 3535 1/4" 2.0 3540 1/16" 3.0 1/8" 3.0 3/16" 2.0 1/4" 2.0 706
"M" - Maintenance Factor
A factor that provides the additional preload needed in the flange fasteners to maintain the compressive load on a gasket after internal pressure is applied to a joint. The net operating stress on a pressurized gasket should be at least (m) x (design pressure, psi).
"Y" - Minimum Design Seating Stress
The minimum compressive stress in pounds per square inch (or bar) on the contact area of the gasket that is required to provide a seal at an internal pressure of 2 psig (0.14 bar).
Gasket Constants
Thickness M
1/16" 1/8" 3/16" 1/4" (in envelope) 1/8" HP 3560 1/16" 1/8" HP 3561 1/16" 1/8" 3565 1/16" 1/8" 3 /16" 1/4" 3575 1/16" 1/8" 3591 1/16" 1/8" 3594 1/16" 1/8" 3700 1/16" 1/8" 5500 1/16" 1/8" 5507 1/16" 1/8" 9800 1/16" 1/8" 9850 1/16" 1/8" 9900 1/16" 1/8" STRESS SAVER® 370 1/8" 3545
Y (psi)
2.6 2.0 2.0 7.0 2.0 5.0 5.0 5.0 5.0 2.8 3.7 5.5 6.0 2.1 2.1 4.3 2.0 3.0 3.0 3.5 6.7 6.6 6.6 3.5 5.5 3.5 8.0 6.5 8.0 4.5 6.0
1,500 2,200 2,200 3,700 800 3,500 4,000 3,500 4,000 1,400 2,300 2,800 2,800 2,000 2,500 1,650 1,650 1,650 2,500 2,800 4,200 2,600 3,300 2,400 3,900 2,350 3,200 2,550 2,800 4,100 4,100
2.0
400
* These M values, based on ambient temperature leakage with nitrogen, are high. Field experience has shown that lower values would be workable in elevated temperatures. Consult Applications Engineering.
a
Gs
S100
S1000
S3000
S5000
S10000
1/16" 1/16" 1/16" 1/16" 1/8" 1/16" 1/8" 1/16" 1/8" 3/8" 1/16" 1/16" 1/8" 3/16" 1/16" 1/16" 1/16" 1/16" 1/8" 1/8" 1/16" 1/16" 1/16"
970 816 1400 949 1980 183 1008 289 444 430 550 162.1 92.48 628 72.3 205 35 151 66 1,318 1,247 1,591 2,322
0.384 0.377 0.324 0.253 0.169 0.357 0.221 0.274 0.332 0.286 0.304 0.379 0.468 0.249 0.466 0.393 0.582 0.41 0.523 0.258 0.249 0.239 0.133
0.05 0.066 0.01 2.60E+00 3.93E-01 4.01E-03 2.23E+00 6.61E-11 1.29E-02 1.69E-09 7.64E-01 1.35E-09 2.50E-03 7.93E-05 2.16E-01 7.08x10-12 1.90E-04 1.64E-05 4.98E-06 6.00E-01 1.10E+01 9.30E+00 1.80E+01
5,686 4,631 6,225 3,043 4,313 947 2,793 1,021 2,048 1,605 2,230 927 799 1,977 618 1,251 517 998 739 4,324 3,925 4,783 4,284
13,765 11,033 13,126 5,448 6,365 2,155 4,649 1,918 4,399 3,101 4,491 2,217 2,349 3,507 1,808 3,090 1,975 2,564 2,462 7,833 6,964 8,292 5,819
20,989 16,694 18,738 7,194 7,663 3,190 5,928 2,592 6,336 4,245 6,272 3,361 3,930 4,611 3,016 4,756 3,745 4,023 4,373 10,400 9,155 10,782 6,735
25,537 20,240 22,110 8,187 8,354 3,828 6,638 2,981 7,507 4,913 7,326 4,079 4,992 5,236 3,827 — 5,041 4,961 5,712 11,865 10,397 12,182 7,208
33,325 26,284 27,678 9,756 9,393 4,903 7,739 3,605 9,449 5,991 9,044 5,303 6,907 6,222 5,286 7,630 7,547 6,591 8,208 14,188 12,356 14,377 7,904
1/16"
2,455
0.267
6.22E-01
8,396
15,526
20,818
23,860
28,711
706
Thickness Gb
4,800 6,500 3,050 4,400 2,500 2,500 2,500 2,500 3,300 5,900 2,500 3,000 2,100 3,000 3,050 3,500 2,750 3,500 1,650 3,000 3,000 3,000 2,350 2,500 1,650 1,650 3,000 1,700 2,200 2,200 2,500
Style
3123 3125SS 3125TC 3500 3504 3510 3535 3540 3545 3561 3575 3591 3594 3700 5500 9850 9900
Style
Y (psi)
Gb = stress at which seal is initiated; "a" = the slope of the log/log tightness curve; Gs = intersection of the unload curve with the vertical axis (Tp1).
Tpmin
Tpmax
— — — — — — 373 16,890 223 25,375 3,097 14,817 141 72,992 11,881 25,501 1,770 17,550 373 973 23,670 18,209 61,985 4,460 53,307 373 1,688 21,755 3,622 21,379 1,410 29,194 10,318 41,724 6,308 24,174 373 — 373 — 141 110,005 199 128,434 —
—
Note: For a 5" OD gasket at 800 psig, Tp100 = 102ml / min. leakage, Tp1,000 = 1.02ml / min. leakage, Tp10,000 = 0.01 ml / min. leakage.
C-39