{"operation":"document","citation":"13-0116","title":"Custom Metalcraft, Inc — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2013-09-24","effective_on":null,"summary":"13-0116 response to Custom Metalcraft, Inc concerning 178.273, 178.275.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-13-0116.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-13-0116.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-13-0116","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2013/130116.pdf","body":"<<<PAGE 1>>>\n\nU.S. Department\nof Transportation\nPipeline and Hazardous\nMaterials Safety\nAdministration\n1200 New Jersey Avenue, SE\nWashington, D.C. 20590\nSEP 2 4 2013\nMr. Eric Larson\nCustom Metalcraft, Inc.\n2332 E. Division, P.O. Box 10587\nSpringfield, Missouri 65808\nRef. No.: 13-0116\nDear Mr. Larson:\nThis responds to your May 16, 2013 letter requesting clarification of the Hazardous\nMaterials Regulations (HMR; 49 CFR Parts 171-180) applicable to the manufacturing and\ndesign of portable tanks. In your letter, you describe the calculations you use for the testing\nof a specification United Nations (UN) portable tank, under § 178.275, for the transportation\nof liquid and solid hazardous materials. You ask this Office to verify whether the\ncalculations as presented in your letter are correct and would meet the design requirements\nprescribed in § 178.275.\nThis Office does not perform the function of certifying whether a portable tank design meets\nthe UN specification as prescribed in Part 6 ofthe UN Model Regulations. However, the\nHMR provide an application process for approval of a Specification UN portable tank\ndesign as specified in§ 178.273. Such applications are submitted to a designated approval\nagency authorized to approve portable tank designs in accordance with the procedures\nspecified in Subpart E, Part 107, of 49 CFR Volume II, chapter I, subchapter A.\nI hope this satisfies your inquiry. Please contact us if we can be of further assistance.\nSincerely,\nT. Glenn Foster\nChief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n\n<<<PAGE 2>>>\n\nDrakeford, Carolyn (PHMSA)\nFrom:\nSent:\nTo:\nSubject:\nAttachments:\nINFOCNTR (PHMSA)\nTuesday, May 28, 2013 12:17 PM\nDrakeford, Carolyn (PHMSA)\nFW: requesting a letter of interpretation\n20130524104316272.pdf\nPtJr-!rJJ?I e_ Tan k5\n/'3-0II~\nHi Carolyn,\nThis caller requested we submit this e-mail as a formal letter of interpretation.\nThanks,\nVictoria\nFrom: Eric Larson [mailto:ericl@custom-metalcraft.com]\nSent: Friday, May 24, 2013 12:10 PM\nTo: INFOCNTR (PHMSA); Majors, Leonard (PHMSA)\nCc: Steve Allred; Jeff Nelson; Mike Bither\nSubject: requesting a letter of interpretation\nI am requesting a letter of interpretation on the information contained in the attached pdf. If this is the improper format\nto request a letter of interpretation please let me know. In the mean time please respond to the information contained in\nthe pdf via email. If I get no response to the information contained in the pdf I will assume my statements in the pdf are\ncorrect and will proceed with vessel design and fabrication under that assumption.\n;·\nFrom: Eric Larson\nSent: Monday, May 13, 2013 10:13 AM\nTo: 'leonard.majors@dot.gov'\nSubject: Questions\nPlease submit a response as we discussed on the phone:\n1) 2) Special provisions 814 & TP38 specify a thermal conductance of no more than .075 8tu/(Hr Ft/\\2 F) which take as\nthe thermal conductivity k per inch of thickness. We have a \"repeat\" job that was originally DOT 51 that had\nessentially 2\" thick insulation. I don't know of any insulation that will satisfy the maximum of .075 8tu/(Hr FtA2 F)\nwith a 2\" thickness along with maximum insulation temperature requirements. Am I reading this correct? I am\ntaking k and dividing it by the insulation thickness which must be less than or equal to .075 8tu/(Hr FtA2 F).\nk/t<=.075 8tu/(Hr Ft/\\2 F)? If that is the case we are looking at 3\" to 6\" of insulation depending on what insulation\nmaterial is used (see pdf). We use 2\" of insulation on vessels unless there is some reason to go thicker and in this\ncase we have an existing design we want to try and keep. In addition, what parts of the vessel need to be\ninsulated (see pdf of original tank)? I would assume any parts that need to be insulated would have to have a\nminimum thickness measured perpendicular to the shell surface per the thermal conductance criteria?\nPer 178.275(8) \"The partial pressure (in bar) of air or other gases in the ullage space, resulting from their\ncompression during filling without pressure relief by a maximum ullage temperature of 65 oc (149 oF) and a liquid\nexpansion due to an increase in mean bulk temperature of 35 oc (95 oF); and\" Does this mean that we are starting\nwith an empty tank that is totally closed off, no pressure relief valve or venting of any kind, with air at\natmospheric pressure and temperature inside the tank and then filling to the maximum fill level with the\nhazardous material, the resulting pressure due to the compression of the air would then be calculated at the\nmaximum fill level at 149 oF and the design pressure must not, in part, be less than this?\n1\n\n<<<PAGE 3>>>\n\nNOTICE: This foregoing e-mail message and any attachments to this e-mail is\nconfidential, may contain trade secrets or proprietary information, and may be\nprotected by legal or other privilege. If you are not the intended recipient, be\naware that any disclosure, copying, distribution, or use of this e-mail message\nor any attachment is prohibited. If you are the intended recipient, please be\nadvised that the e-mail address bar of the sender and any signature in the\nmessage is not intended as an electronic signature unless the sender expressly\nstates in the message that the senders signature in the message is intended to\nbe an electronic signature for purposes of state and federal laws pertaining to\nelectronic signatures. If you have received this e-mail message in error, please\nnotify us immediately by returning it to the sender and delete this copy from\nyour system. Thank you for your cooperation.\n2\n\n<<<PAGE 4>>>\n\nAndrews\n$172.102\n3178.275 (B)\nPortable Tanks\n13-0116\n178.275 (6)(1) (B):\nVEu Full Volume Of Vessel (uncorreded).\nVN = Nominal Volume of Vessel (Max. Product Volume)\nde = density of Product @ 2/C 470°f)\n2350°\ndas\" density or product 265° (149°F)\n_Istrease\nTA = Atmoseneric Temperature 294 K(*22)(*70€,\nPA = Absolute Atmostneria Pressure I bar (ISPS=)\nChoose ine fui volume of vessel VFU\nsteP 2)\ncalculate:\nPe= max uncorroded poure pressure of\nthe ullage Spare LAir).\nTu= mat unerraded lage Temperature (Air)\nStart with EmPty vessel at Atmospheri\n70°f\nOPSIG\nPressue and Temperature Disable a\nventing ded Frassure relier, Fill\nthe vessel to the Nominal volume of\nvessel the dir in the uage ifs.\nWill Now be at Ps and Tue\n\n<<<PAGE 5>>>\n\nPRIATIONS OND A CONSTANT\nvale for air of l.4 Pe and Tu\ncan be calculatel.\n1.4\nPE= PA\nVFu\n1 PA d050:u+2\nVEU - VN\n(d65))\n(/4-1)\nTy= TA\nVFu\nVE..\nVN\nđos))\nSTeP 3)\nrecalculate\nPer step 1) and Stef 2)\nUNtil Tu is Less thon or\nBased on SteP i), Step? and iteP 3),\nThe vessel now complies with\n178.275 (6)(1)(B) and VEd\nis the full\nvolume of the\nvessel that will be Built and\ni addition\n• the Vessel car\nIF VM. IS this Statement correct?\nIf Not Please ExPlain.\n\n<<<PAGE 6>>>\n\nP83\n172.102 TPZ:\nPer 178.275 (6)(1) (B) a\nmaximum Degree of Filling is\nDetermines.\n... This is\nVF1\nFor the specific cose where\nall resting and Pressure relieF\nremoves Disted 2.055 TRE\nis for the case where all Venting\nand Pressure relief is working\nProperly as specifies and Designed.\nThe matimum Degree of Eling\nis the besser of that Determined\nPer 178:275 (k) (11) (B) ano\n172102 TPE IS this statement\nCorrect? IF Not PLese ExPIRiN.","truncated":false,"body_characters":7224}