Quick Delivery

Ring Flange Gasket

Ring Flange Gasket

Maloney Technical Products recommends the use of Maloney Special Elastomer Ring Flange Gasket for sealing ductile iron flanged pipe when special applications such as systems designed for transmitting oils and chemicals, high temperature water and air applications require elastomers with enhanced performance criteria above SBR gaskets.

Available in the following compounds:

Water & Sewer Air
EPDM 212°F 150°F Vegetable Oil, Alcohols, Dilute Acids, Diluted Alkalis, MEK,
Acetone, fresh water, sea water, storm water, sanitary sewage & reclaimed water
Nitrile 150°F 125°F Fresh water, salt water, sanitary sewage, storm water, petroleum products, oils, fats, chemicals, greases
Neoprene 200°F 150°F Fresh water, salt water, sanitary sewage, storm water, greases
FKM 212°F 300°F Fresh water, salt water, storm water, aromatic hydrocarbons, fuels, acids, vegetable oils, petroleum products, and most chemicals and solvents
  • Sizes 4” – 36”, 1/8” Nominal Thickness
  • Rated for a water working pressure of 350psi For 4”-24” and 250psi for 30”-36”
  • Compatible with flanges confirming to ANSI/AWWA C-115/A21.15, ANSI/AWWA C110/A21.10, ASME B16.1 class 125, ANSI/AWWA C207 class B, D, E and F, and ANSIB16.5 in sizes 4”-24”
  • Designed for unique surface of Ductile Iron Flange joints
  • Employs three ring type pieces molded into the gasket that project beyond both sides of the main surface of the gasket to greatly improve sealing and reduces bolt torque required to seal the joint


Size OD Working Bolt Torque
at 250psi
Working Bolt Torque
at 350psi
Inches Inches Pressure ft./lb Pressure ft./lb
4 6.88 250 90 350 110
6 8.75 250 90 350 110
8 11.00 250 90 350 110
10 13.38 250 90 350 130
12 16.13 250 90 350 130
14 17.75 250 110 350 150
16 20.25 250 110 350 160
18 21.63 250 120 350 180
20 23.88 250 120 350 200
24 28.25 250 130 350 220
30 34.75 250 140 350
36 41.25 250 160 350

Prior to assembly, make sure the flanges are free of sand, grit, grease or other foreign material.

Hand tighten all bolts and check for alignment. Use a crisscross pattern to tighten the bolts, starting with the top bolt then the bottom bolt 180° from the top bolt, then 90° to the left and tighten that bolt, then 180° to the right across from it then one bolt to the right and repeat the crisscrossing for the remainder of the bolts. Flange bolts must be evenly torqued in stages to provide proper sealing.

These gaskets were designed specifically for the unique surface of Ductile Iron. Flat rubber gaskets are NOT considered equal in performance and may not provide the sealing capability the project requires. In addition, their use could result in unintended damage to the flanges and threads of the fabricated pipe by applying excess torque to the bolts/flanges in order to seal.

Call Maloney Technical Product Customer Service Representative with the project specifications for recommendation on best compound to use for a special application, current lead times and for pricing. Maloney maintains inventory on many of the sizes and special compounds.