LOKRING fittings have been approved unconditionally by the American Association of Railroads (AAR) for installation on interchange service freight cars since 1997.
In order to meet the demands of the rail industry, LOKRING fittings have been subjected to a signifcant testing program. Test Report #TR93-008, “Qualification Testing of LOKRING Carbon Steel Fittings”, advises on ASME B31 piping qualifications for pressure ratings and stress intensification factors consistent with code guidelines and requirements.
LOKRING fittings have been subjected to burst, flexural, vibration, torsion, tensile, corrosion, fire, high temperature soak and steam thermal cycling testing.
Typical Railcar Applications
- Branch pipe tee connection — 1 each 1-1/4”. If the car is equipped with a brake pipe reduction device, it will require a second tee connection.
- Control valves — 3 each 3/4” flange couplings, may be straight or 90°, depending on brake cylinder design. Also some cars are equipped with an extra reservoir and would require an extra coupling.
- Combined reservoirs — 2 each 3/4” flange couplings, may be straight or 90°, depending on brake cylinder design. Also some cars are equipped with an extra reservoir and require an extra coupling.
- Retaining valve — 1 each 3/8” NPS flange.
- Brake cylinders — 1 each 1/2” or 3/8” flange with or without a brake cylinder measurement tap opening.
- Empty/load equipment which will require a flange for each valve connected, between 4 and 6 each 1/2” or 3/8”. Straight couplings for train line 1-1/4”.
|
Fitting Size (PXX) |
Insertion Depth |
Insertion Depth |
Outside |
Inside Diameter |
Minimum Straight Run |
|
3/8”(P06) |
1.37” |
0.95” |
1.24” |
0.69” |
2.08” |
|
1/2” (P08) |
1.43” |
1.01” |
1.46” |
0.87” |
2.24” |
|
3/4” (P12) |
1.62” |
1.16” |
1.60” |
1.08” |
2.65” |
|
1” (P16) |
1.98” |
1.41” |
1.95” |
1.33” |
2.86” |
|
1-1/4” (P20) |
2.21” |
1.57” |
2.29” |
1.68” |
3.33” |
1. All dimensions are in inches.
2. Dimensions A, B, C, D, & E are applicable to other fittings of the same size within this catalog.
3. For use on seamless carbon steel pipe as per ASTM A53S and ASTM 106 and ERW carbon steel pipe to ASTM A53E and ASTM A587.
4. Fitting material Micro Alloyed Carbon Steel to LMS 92-10 or LMS 97-20.
5. Standard coating is black oxide per LMS 93-12.
6. Other part configurations than those shown and custom configurations may be available, contact LOKRING for details.
7. All dimensions are for reference only and subject to change (CAD files available upon request).
Scope of Specification: This specification covers LOKRING pipe fittings manufactured from high strength, low alloy carbon steel. Fittings are qualified on carbon steel nominal pipe (NPS) from 3/8” through 1-1/4”. For fitting dimensions, refer to the product specification sheets.
For installation procedures and selection of tooling see specification LP-105.
Fitting Material Specification: Fitting body and swaging rings are manufactured from high strength, low alloy carbon steel. Material shall conform to ASTM A675 with the chemical composition and mechanical properties as listed in LOKRING specifications for the material. For shelf-life corrosion protection, machined fittings shall be subjected to a black oxide process, followed by a rust inhibiting dip. Contact LOKRING for material or process specifications.