DISC SPRINGS FOR FLANGE APPLICATIONS

METRIC DISC SPRINGS

Spring Discs are an elastic mechanical element. When used in bolt joints that are subject to thermal or mechanical shock, they deflect and move with the bolted joint. Hence, they compensate for developed looseness. The reactive power of the spring disc serves to keep the bolt joint tight under all conditions. Principal applications include piping construction, compression joints, steam piping joints, valve and pump connections, and others in the petrochemical field.

A principal cause of flange leakage is abnormally high loads produced by thermal expansion and contraction of a bolted joint. Generally, flanges are under static load conditions. However, in large piping systems, there may also be mechanical shock from compressor related piping. Thermal and mechanical shock differential can cause variation and yielding in bolt loads. To protect against these conditions, always use spring discs under the nut or bolthead.

Pre-stressing or torquing the bolt at factory installation is not sufficient to protect the flange joint tinder unexpected temperature variations and mechanical shock loads in the field. By absorbing peak stresses, spring discs prevent damage to the bolt, gasket and joint.

 

    METRIC DIMENSIONS    
PART NO. NOM

BOLT

SIZE

D d t O.H. LOAD

AT FLAT

NEWTONS

METRIC

SIZE

MFL8050 8 15 8.4 1.25 1.70 6000 M8
MFL8078 8 15 8.4 2.00 2.30 17000 M8
MFL10078 10 18 10.4 2.00 2.30 11000 M10
MFL12090 12 22 12.4 2.30 2.60 13000 M12
MFL20160 20 36 20.8 4.00 4.60 43000 M20
MFL24160 24 43 24.8 4.00 4.80 39000 M24
MFL27168 27 49 27.8 4.30 5.00 40000 M27
MFL30190 30 56 30.8 4.80 5.60 42000 M30
MFL36250 36 68 36.8 6.40 7.50 92000 M36
MFL39250 39 70 39.6 6.40 7.50 91000 M39

*For single spring disc; for higher loads, use parallel stacks. Note: Load calculated for 17/7 PH stainless steel with large radii, R = t/4

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