# Silver/Cims LLC — Hazardous Materials Safety Interpretation **Citation:** 08-0197 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2008-11-20 08-0197 response to Silver/Cims LLC concerning 171.23, 173.244, 178.273, 178.274. ## Document text <<>> U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration 1200 New Jersey Ave., SE Washington, DC 20590 NOV 2 c 2049 Mr. Jim Silver SilverICims LLC 1304 First Street Seabrook, TX 77586 Ref. No. 08-0 197 Dear Mr. Silver: This is in response to your electronic transmission requesting clarification of the Hazardous Materials Regulations (HMR: 49 CFR Parts 17 1 - 1 80) regarding the import of Dimethyl sulphate or Dimethyl sulfate, UN1595, 6.1, 8, PG I, Hazard Zone B in a UN portable tank that was manufactured outside the United States. You state that the portable tank is manufactured to the ASME Code, Section VIII, but is not "U" stamped. You ask whether the shipment, which is being transported in accordance with the International Maritime Dangerous Goods (IMDG) Code, may be imported into the United States without the "U" stamp. The answer is no. A UN portable tank used to import Dimethyl sulfate, UN1595, 6.1, 8, PG I, Hazard Zone B into the United States is required to be certified and stamped to the ASME Code as specified in $ 8 171.23(b)(lO)(ii), 173.244, 178.273(b)(6) and 178.274(b)(l). The U.S. Department of Transportation requires the shipment of toxic-inhalation-hazard liquids to be transported in ASNIE Code "U" stamped portable tanks regardless of what other regulatory standards may allow. The "U" stamp can only be applied at the time of manufacture and is the only recognized form of certification that verifies the ASME quality system has been properly implemented. Additionally, the UN portable tank must conform to any applicable special provisions, such as Codes TP 3 8 and TP 45, listed in Column 7 of the § 172.10 1 Hazardous Materials Table. I hope this information is helpful. Please contact this office should you have additional questions. Hattie L. Mitchell Chief, Regulatory Review and Reinvention Office of Hazardous Materials Standards <<>> Drakeford. Carolvn cPHMSA> From: Sent: To: Subject: IhlFOCNTR Wednesday, July 30,2008 8:51 AM Drakeford, Carolyn FW: Information Center CommentslQuestions Carolyn Thanks, Rob This man would like an official letter of interpretation. ----- Original Message----- From: jsilver@silvercims.com [mai~to:jsi~ver@silvercims.com] Sent: Tuesday, July 29, 2008 4:17 PM To: INFOCNTR Subject: Information Center Cornments/Questions Below is the result of your feedback form. It was submitted by Jim Silver (jsilver@silvercims.com) on Tuesday, July 29, 2008 at 16:17:17. Name : Jim Silver Category: Interpretations (Letters) issued by PHMSA Organization: Silver/Cims LLC Street: 1304 First St City: Seabrook State: Texas Zip Code: 77586 Phone: 832 425 7124 Fax: 281 474 7840 Comments: Please confirm in writing (on USDOT letterhead) advising that a shipper may import UN 1595 Dimethyl Sulphate in accordance with IMDG code (as per 49 CFR 171.22, 171.23 and 171.25) in a UN Portable type T 20 tank ( . Specific trade route for this shipment is ; load Italy and ship via vessel to USA, discharge USA and return empty via vessel to Italy). IMDG code specifies T 14 (T 20 is superior equipment ) . The specific tanks to be used ( GESU 806600 series) were designed in accordance with ASME Section VIII Div 1 but not U stamped. Shipper will follow TP 38 and TP 45 rules. ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `0e3b3d20c67799650581148c26df8e04f7e6148e4f1c8c29fd7f9c97e0262210` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-22T02:43:15.814Z - Document slug: `phmsa-interpretation-08-0197` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "Silver/Cims LLC" ], "individuals": [ "Mr. Jim Silver" ], "refIds": [ "08-0197" ], "catalogDates": [ "2008-11-20" ], "catalogParts": [ 171, 173, 178 ], "catalogRowCount": 4, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/55536" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "171.23", "171.23(b)(lO)(ii)", "173.244", "178.273", "178.273(b)(6)", "178.274", "178.274(b)(l)", "172.10", "171.22", "171.25" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/17123", "https://www.phmsa.dot.gov/regulations/title49/section/173244", "https://www.phmsa.dot.gov/regulations/title49/section/178273", "https://www.phmsa.dot.gov/regulations/title49/section/178274" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2008/080197.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2008/080197.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2008/080197.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/08-0197-0fe7a4afa8.pdf", "pdfArtifactSha256": "a18dcb8256ae24f92d64c51f894acf39c66b9bbb783a6a2c0599fc997a6abf43", "extractedTextPath": "data/sources/phmsa-interpretations/08-0197-0fe7a4afa8.v2.txt", "extractedTextSha256": "5b36fbfe61def6e7def94f06a5e9d79f6c5ba826fae04372861b01e46be2e916", "pageCount": 2, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```