ALSO KNOWN AS “THRUST PLATES”, “HARNESS LUGS” OR “GUSSET PLATES”

TRUMBULL FLANGE LUGS are used to prevent separation of plain-end piping components. They are installed on the back sides of ANSI Class 125 B16.1 and Class 150 B16.5 flanges to allow tie rods to span across an unrestrained piping component. One example is with a flexible coupling as illustrated below.

Trumbull Flange Lugs are also used with rubber expansion joints to limit their expansion. Uncontrolled expansion can lead to failure of rubber expansion joints.

When using threaded ductile iron flanges, check for clearance of the Flange Lug inner radius with the flange hub O.D. Two flange lugs are used in conjunction with a tie rod, two flat washers and four hex nuts to comprise one set. At least two sets are required per joint. Longer flange bolts are required at the flange lug to accept the plate thickness.

NOTE: The total number of flange lugs required should be determined by the project Engineer, or the expansion joint manufacturer.

Material is ASTM A36 carbon steel plate and 304 stainless steel. Carbon steel lugs are supplied with a Tnemec 37-77 red primer coating; other coatings and finishes are available upon request. Flange Lugs for Class 250 / 300 are available upon request.

CARBON STEEL FLANGE LUGS

Carbon Steel Flange Size Plate Thickness Tie-Rod Size Weight
364-4104 4" 1/2" 5/8" 0.94 lbs.
364-4106 6" 1/2" 5/8" 1.26 lbs.
364-4107 8" 1/2" 5/8" 1.56 lbs.
364-4108 10" 3/4" 3/4" 2.91 lbs.
364-4109 12" 3/4" 3/4" 3.27 lbs.
364-4110 14" 3/4" 3/4" 3.90 lbs.
364-4111 16" 1" 1" 5.09 lbs.
364-4112 18" 1" 1" 5.68 lbs.
364-4113 20" 1" 1" 5.31 lbs.
364-4114 24" 1-1/8" 1-1/8" 7.44 lbs.
364-4115 30" 1-1/8" 1-1/8" 10.90 lbs.
364-4116 36" 1-1/4" 1-1/4" 12.10 lbs.
364-4117 42" 1-1/2" 1-1/4" 14.50 lbs.
364-4118 48" 1-1/2" 1-1/4" 16.50 lbs.

STAINLESS STEEL FLANGE LUGS

Stainless Steel Flange Size Plate Thickness Tie-Rod Size Weight
364-4124 4" 1/2" 5/8" 0.94 lbs.
364-4126 6" 1/2" 5/8" 1.26 lbs.
364-4127 8" 1/2" 5/8" 1.56 lbs.
364-4128 10" 3/4" 3/4" 2.91 lbs.
364-4129 12" 3/4" 3/4" 3.27 lbs.
364-4130 14" 3/4" 3/4" 3.90 lbs.
364-4131 16" 1" 1" 5.09 lbs.
364-4132 18" 1" 1" 5.68 lbs.
364-4133 20" 1" 1" 5.31 lbs.
364-4134 24" 1-1/8" 1-1/8" 7.44 lbs.
spec/ord 30" 1-1/8" 1-1/8" 10.90 lbs.
spec/ord 36" 1-1/4" 1-1/4" 12.10 lbs.
spec/ord 42" 1-1/2" 1-1/4" 14.50 lbs.
spec/ord 48" 1-1/2" 1-1/4" 16.50 lbs.