Interpretation Response #99-0313 ([Chemical Manufacturers Association] [Mr. Randy Speight])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: Chemical Manufacturers Association
Individual Name: Mr. Randy Speight
Location State: VA Country: US
View the Interpretation Document
Response text:
August 25, 2000
Mr. Randy Speight Ref. No. 99-0313
Mr. Joe J. Mayhew
Chemical Manufacturers Association
1300 Wilson Boulevard
Arlington, VA 22209
Dear Messrs. Speight and Mayhew:
I apologize for the delay in responding to your letter concerning the requirement in 49 CFR 173.31(d)(1)(vi)to carefully inspect a frangible(rupture) disc in a pressure relief device prior to each hazardous material shipment This requirement has its origins in regulations of the Interstate Commerce Commission issued in 1921. The wording of this requirement was most recently revised in a final rule published on September 21, 1995, under RSPA’s Docket Nos. HM-175A and 201 (60 Fed. Reg. 49098).
As the language of § 173.31 (d)(1)(vi) states, the purpose of this type of inspection is to check "for corrosion or damage that may alter the intended operation of the device.” For that reason, in response to a comment submitted in a separate rule-making proceeding under DocketNo.FM-216 (61 Fed. Reg. 28666, 28671; June 5, 1996), we stated in the preamble that RSPA and FRA believe in order to fully inspect a rupture disc (both top and bottom), the disc must be removed from the safety vent device. It has been FRA’s experience that a rupture disc may appear normal on the top side, but be severely damaged or corroded on the bottom side.
You and others have raised concerns about the language of the present rule and its application to persons that forward a loaded tank car received from another location or return a tank car with residue. We anticipate initiating a rule-making in the near future to address these concerns.
Sincerely,
Edward T. Mazzullo
Director, Office of Hazardous
Materials Standards
173.31
Regulation Sections
| Section | Subject |
|---|---|
| 173.31 | Use of tank cars |