DISC SPRINGS FOR FLANGE APPLICATIONS

INCH 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.

 

    INCH DIMENSIONS    
Part No. NOM

BOLT

SIZE

D d t O.H. LOAD

AT FLAT

P(lbs)

METRIC

SIZE

FL-388 3/8 .714 .390 .080 .086 1200 M10
FL-716 7/16 .820 .462 .080 .097 2800  
FL-889 1/2 .900 .515 .089 .100 2100 M12
FL-10125 5/8 1.145 .656 .125 .143 4400 M16
FL-12131 3/4 1.365 .781 .131 .150 5100 M20
FL-14160 7/8 1.585 .906 .160 .180 7100 M22
FL-18168 1.0 1.805 1.032 .168 .195 8600 M26
FL-18187 1-1/8 2.020 1.156 .187 .217 10600 M29
FL-20190 1-1/4 2.240 1.281 .190 .225 10500 M32
FL-22250 1-3/8 2.450 1.406 .250 .290 23000 M35
FL-24250 1-1/2 2.680 1.531 .250 .290 19000 M38
FL-26262 I-5/8 2.950 1.687 .262 .307 20000 M42
FL-28281 1-3/4 3.170 1.812 .281 .329 23000 M45
FL-30300 1-7/8 3.380 1.937 .300 .353 28000 M48
FL-32318 2.0 3.600 2.062 .318 .375 32000 M52
FL-36356 2-1/4 4.040 2.312 .356 .418 39000 M58
FL-40394 2-1/2 4.470 2.562 .394 .464 48000 M64

*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

.

Series Disc for Flange Application Index Home

FAN DISC CORPORATION

8127 Clybourn Avenue Sun Valley CA 91352

(818) 767-1886 · (818) 767-7415 FAX

©Copyright 1997 Fan Disc Corporation