Seal-Lok for CNG Fittings and Adapters provide reliable natural gas fuel conveyance in CNG applications with an O-ring face seal design that incorporates an elastomeric seal compound made of hydrogenated nitrile. Tested and certified by TUV for applicable industry standards, these O-ring face seal fittings offer many benefits like, zero clearance for easy plumbing, resistance to over-tightening and vibration, and unlimited remakability, which make it an ideal hydraulic fluid connection solution. Seal-Lok for CNG leak-free connections reduce warranty costs and maintenance expenditures while providing a competitive advantage for customers in the CNG market.
Below are the most frequently asked questions about Seal-Lok for CNG to give you a better understanding of this reliable leak-free connection solution.
HNBR compound, 85 durometer, rated for -58ºF to 300ºF (-50ºC to 148ºC). Parker also has other CNG approved compounds available as specials. Please contact TFD directly if you have specific compound requirements at 614-279-7070.
316 Stainless Steel and Carbon Steel with Parker’s XTR (Zinc-Nickel) plating are both approved.
Yes. It is approved in -12 and smaller by ANSI NGV 3.1-2014/CSA 12.3-2014 for on-vehicle applications.
One of Parker’s three Parflange machines will need to be used to flange the end of the tubing:
Through your local Parker distributor. Find the nearest Parker distributor now: Parker Distributor Locator.
Yes. Parker has specifically designed one-piece pins for CNG coiled tubing.
No. Use Parker’s special CNG pins for coiled tubing.
Yes. Both Parflange machines and tooling can be rented directly from a local Parker distributor.
Yes. Replacement O-rings can be purchased from TFD. Available O-rings are in Parker Catalog 4300. CNG O-rings will need the CNG suffix added to the p/n. For example, 2-014 CNG or 3-906 CNG.
This is a required test for the Pressure Relief Devices (PRD) used on CNG pressure cylinders. At a customer’s request, this test was adapted by Parker TFD to test the performance of Seal-Lok for CNG
fittings in a similar scenario. Seal-Lok fittings were tested with the CNG HNBR seals in a worst-case (1200ºF) fire, followed immediately with a cold-water purge while being continuously monitored for leaks.
Seal-Lok for CNG PASSED the requirements of no leaks and held pressure throughout the required duration.
For more information on bonfire test and specifics about why this was needed, please see our blog post with a test summary: Seal-Lok ORFS CNG Fittings Pass On-Vehicle Fire Safety Test.
Refer to the Assembly Section of Parker Tube Fittings Division Catalog 4300. You can also refer to blog post and video “Assembly Instructions for Ensuring Leak-Free O-ring Face Seal Fittings.”
Yes. Parker’s stainless (SS) Seal-Lok for CNG fittings come with pre-applied Lube-SS on the tube nuts to prevent galling. In addition to the pre-applied product, it is always good practice to use anti-galling lubrication where connecting two SS threaded connections.
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Contributed by Cody Yarletts, product manager, at Parker Tube Fittings Division
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