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INSPECTION &
MAINTENANCE BULLETIN
ARI 1108 & HP1108
Safety Relief Valve
These instructions are applicable to the following models:
Only facilities with AAR Activity Code C5 are certified to recondition, repair, retest and qualify
tank car safety relief valves. Personnel performing inspection and test must be certified Level I
per AAR Manual of Standards and Recommended Practices, M-1002, Appendix T, 1.4.3.
American Railcar Industries, Inc.
ARI 1108
ARI HP1108
Updated 3/1/2017
1
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Summary of Contents for ARI 1108
- Page 1 INSPECTION & MAINTENANCE BULLETIN ARI 1108 & HP1108 Safety Relief Valve These instructions are applicable to the following models: ARI 1108 ARI HP1108 Only facilities with AAR Activity Code C5 are certified to recondition, repair, retest and qualify tank car safety relief valves. Personnel performing inspection and test must be certified Level I per AAR Manual of Standards and Recommended Practices, M-1002, Appendix T, 1.4.3.
- Page 2 New Valves for Replacement of Existing Equipment New valves are tested, sealed and packaged at the time of manufacture. A new valve can be applied provided it is still in its original packaging and tested within 6 months of the installation date. A valve with a test date older than 6 months must have the O-rings replaced and retested.
- Page 3 The inside of the top stem guide should be free of paint, debris, nicks, burrs or other discontinuities. Visually inspect the inside of the guide and the mating area on the upper stem. Any sign of significant wear should be reported to ARI Engineering for review and disposition. Valve Stem Remove all scale, residue and other foreign material from the stem with a wire brush.
- Page 4 Valve Body The area around the valve seat must be free of debris, corrosion and foreign objects. Cleaning can be accomplished with a light brush off blast using glass bead media. The seating surface must be free of nicks, burrs and gouges. The area should be cleaned and lightly polished with 400 grit emery cloth. Any discontinuity that would prevent the valve from sealing is grounds for replacement.
- Page 5 The ARI 1108 safety relief valve is designed to operate at 75 psig. The start-to-discharge pressure (STD) must be 75 psig +/- 3 psig and vapor-tight at 60 psig minimum. The ARI HP1108 safety relief valve is designed to operate in a range from 225 psig to 330 psig. The start-to-discharge pressures (STD) are as follows:...
- Page 6 The undertaking of repair or replacement by the Purchaser, or its agents, without the expressed written consent of American Railcar Industries, Inc. (ARI) shall void ARI’ s warranty and relieve ARI of all responsibility. Under no circumstances shall ARI be liable for any direct, incidental, consequential or other damages of any kind in connection with the installation, operation, maintenance, repair, inspection or other use of any product purchased from it.
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