Assure correct type of thread sealants are used;
NGS Valve/Cylinders are O"ring sealed to 30-75 ft./lb. with DOW 111 dielectric to prevent electrolysis.
NGT Valve/Cylinders are teflon tape sealed.
Prior to cylinder charging check all test dates and specifications;
Special Permit (Exemption) Numbers 49 CFR 173.23(c);
Aluminum Cylinders which had expired in 1982:
SP(E)6688, SP6576, MUST BE REMOVED FROM SERVICE !
Aluminum Cylinders current as of 1982: SP(E)6498, E7042, E8364, E8422, MUST BE OVER-STAMPED WITH THE CURRENT DESIGNATION 3AL FOR CONTINUED SERVICE !
SP 12479 SERVICABLE AS IS, UNTIL EXPIRATION: AUGUST 31, 2014
6351 Alloy Aluminum Cylinders require eddy current inspection at retests with a "VE" designation after the retest date stamp.
Steel Cylinders with Special Permits;
SP(E) 9791 SERVICABLE AS IS, UNTIL EXPIRATION: JANUARY 31, 2015
SP(E) 12079 SERVICABLE AS IS, UNTIL EXPIRATION: JANUARY 31, 2014
SP(E) 13483 SERVICABLE AS IS, UNTIL EXPIRATION: NOVEMBER 30, 2014
SP(E) 13488 SERVICABLE AS IS, UNTIL EXPIRATION: APRIL 30, 2014
SP(E) 14157 SERVICABLE AS IS, UNTIL EXPIRATION: FEBRUARY 28, 2015
Title 49 Code of Federal Regulations Presc ribes Nonliquified
Compressed Gas "Air" Service in Specification Cylinder as Follows:
49 CFR 173.302a(a)(1); DOT 3, 3A, 3AA, 3AL
CFR 173.301A(C); The pressure in a Cylinder at 21 C (70F) degrees may NOT exceed the service pressure for which the cylinder is marked or designated...
Recommened Charging Rate for Air Service is; 300 - 600 psi / minute.
Inspect Cylinders for Leaks During and After Charging.
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