Table 6. Recommended Depth Ratings* and End-Closure Thicknesses for 

 Various Diameters of Flanged Pyrex Glass Pipe 



Length of 

 Pipe 

 (in.) 



Inside 



Diameter 



(in.) 



One Way 



Dive, 



Depth 



(ft) 



One 



Round-Trip 



Dive, 



Depth 



(ft) 



Multiple 



Dives, 



Depth 



(ft) 



Thickness of** 



End Closures 



(in.) 



(6061 -T6 



Aluminum) 





1 



28,000 



19,000 



5,000 



3/4 





1.5 



22,000 



15,000 



4,000 



15/16 



6 



2 



16,000 



1 1 ,000 



3,000 



1-1/8 



3 



16,000 



1 1 ,000 



3,000 



1-3/4 





4 



16,000 



1 1 ,000 



3,000 



2-1/4 





6 



3,000 



2,000 



500 



1-1/2 





1 



28,000 



19,000 



5,000 



3/4 





1.5 



20,000 



13,000 



4,000 



15/16 



12 



2 



10,000 



6,000 



2,000 



7/8 





3 



7,000 



5,000 



1,500 



1 





4 



7,000 



5,000 



1,500 



M/2 





6 



7,000 



5,000 



1,500 



2-1/4 





1 



28,000 



19,000 



5,000 



3/4 





1.5 



19,000 



13,000 



3,800 



15/16 



18 



2 



10,000 



6,000 



2,000 



7/8 



3 



6,000 



4,000 



1,100 



1 





4 



5,000 



3,000 



1,500 



1-1/4 





6 



4,000 



2,000 



800 



1-5/8 





1 



28,000 



19,000 



5,000 



3/4 





1.5 



19,000 



13,000 



4,000 



15/16 



24 



2 



9,000 



6,000 



2,000 



13/16 



3 



4,000 



2,500 



800 



13/16 





4 



4,000 



2,500 



800 



1-1/8 





6 



3,000 



2,000 



500 



1-1/2 





1 



28,000 



19,000 



5,000 



3/4 





1.5 



19,000 



13,000 



4,000 



15/16 



36 



2 



9,000 



6,000 



2,000 



13/16 



3 



4,000 



2,500 



800 



13/16 





4 



4,000 



2,500 



800 



1-1/8 





6 



2,000 



1,500 



500 



1-1/8 



These ratings reflect not only the experimental data contained in this report, but 

 also experimental data from NCEL TR-523, TR-559, and past experience with 

 reproducible failure pressures for mass-produced stock glass items. 



For a one-way dive, bare aluminum end closures may be used; for round trip or 

 multiple dive service nylon fiber reinforced neoprene gaskets (Fairprene 5722A) 

 are required. 



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