Table 5. Results of Pressure Cycling Tests on 4-lnch-ID x 6-lnch-Long Glass Pipe Assemblies Having Various Bearing-Sealing 

 Systems Interposed Between the Glass Pipe Flange and the Metal End Plates 



(• = completion of cycle without leak; ■ = failure by cracking and leaking; * = failure by implosion.) 



Bearing System 



Interposed Between 



Glass Pipe Flange 



and 



Stainless Steel 316 End Plate 



Successive Pressure Cycling Tests on Same Specimen 



to 3,000 psi, 

 cycle — 



123456789 10 



to 4,000 psi, 

 cycle - 



123456789 10 



to 5,000 psi, 

 cycle — 



123456789 10 



to 6,000 psi, 

 cycle — 



123456789 10 



1. Neoprene 0-ring (60-durometer, 

 3/32-inch section) 



2. Fiber-reinforced neoprene gasket 

 (0.023-inch thick) 



3. RTV silicone rubber with Vespel 

 washer 



4. RTV silicone rubber with copper- 

 steel composite washer plus 

 molybdenum disulfide coating 



5. RTV silicone rubber with lead- 

 steel composite washer plus 

 molybdenum disulfide coating 



6. RTV silicone rubber with aluminum 

 washer plus molybdenum disulfide 

 coating 



7. Neoprene 0-ring— aluminum washer 

 plus molybdenum disulfide coating 



8. RTV silicone rubber with thick 

 rubber washer 



