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Medical Gas Solutions: Brass

Brass Fittings

LOKRING Technology offers a patented, permanent, axially swaged tube fitting. This technology for medical gas applications is now approved by NFPA 99-2005 (Paragraph 5.1.10.7 (4)).

Imagine being able to shut down your
medical gas system and within minutes being able to install a tie-in, a tee for future expansion or to cap off a line for renovation. Medical gas tie-ins can be installed as fast as you can drain the lines.

Simply bleed the medical gas or vacuum line, cut and clean the tubing, and install a LOKRING fitting. It takes less than five minutes to install a permanent, leak-tight fitting. Since no brazing is necessary, no expensive nitrogen NF purge is required. Without brazing, no particulate is created during installation. Gas lines go back into service as fast as the Credentialed Medical Gas Verifier can document proper concentrations.

Pressure Temperature Ratings

This test was performed on 1½” Type K copper tubing. As shown, the copper tubing burst at 3200 psi while the fitting remained intact.

Nominal Fitting Size (TXX)	Tube OD	Qualified Wall Thickness K		Qualified Wall Thickness L
Nominal Fitting Size (TXX)	Tube OD	Wall	Pressure Rating (PSI)	Wall	Pressure Rating (PSI)
3/8" (T06)	0.500	0.049	1946	0.035	1341
1/2” (T08)	0.625	0.049	1534	0.040	1242
5/8” (T10)	0.750	0.049	1266	0.042	1086
3/4”(T12)	0.875	0.065	1466	0.045	1002
1” (T16)	1.125	0.065	1126	0.050	850
1¼” (T20)	1.375	0.065	914	0.055	755
1½” (T24)	1.625	0.072	850	0.060	702
2” (T32)	2.125	0.083	747	0.070	625

Pressure Temperature Ratings: -425º to 400º F

General Information

Nominal Fitting Size (TXX)	Tube O.D.	Qualified Wall Thickness K / L / M	Insertion Depth Pre-Install, A	Insertion Depth Post-Install, B	Outside Diameter, C	Minimum Straight Run Before Obstruction, E
1/2”(T08)	0.625	.049/.040/.028	1.14	0.89	0.91	1.68
5/8”(T10)	0.750	.049/.042/--	1.33	1.02	1.02	1.95
3/4” (T12)	0.875	.065/.045/.032	1.48	1.12	1.19	2.04
1” (T16)	1.125	.065/.050/.035	1.94	1.46	1.53	2.63
1¼” (T20)	1.375	.065/.055/.042	2.20	1.66	1.86	2.82
1½” (T24)	1.625	.072/.060/.049	2.51	1.90	2.21	3.20
2” (T32)	2.125	.083/.070/.058	3.27	2.47	2.88	4.01

1. All dimensions are in inches.
2. Dimensions A, B ,C & E are applicable to all fittings of the same size within this catalog.
3. For use on copper tube per ASTM B819, type K and L wall, and drawn for copper tube
per ASTM B88 type K and L wall.
4. For tooling dimensions refer to Tooling
5. Coupling ‘thru-bore’ design permits tube to pass completely through.
6. Fitting material 360 Brass as per ASTM B16.

7. Fittings are cleaned to CGA G-4.1 standard. (OC = Oxygen Clean)
8. Fittings are approved by NFPA 99-2005 and meet or exceed the design requirements of brazed fittings.
9. CAD files in .DWG file format are available for most configurations.
10. All dimensions are reference only and subject to change.
11. Due to variation in heat affected zones (HAZ), Lokring fittings should be installed at least 6" from a brazed joint.