[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-203547-105":59,"doc-detail-203547-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","environmental-protection-agency-1065340","Environmental Protection Agency § 1065.340","","Section 1065.340 of 40 CFR Ch. I provides calibration procedures for venturi-based flow measurement devices used in emission testing systems. It describes how to calibrate a PDP using collected restrictor-position data, apply equations from § 1065.640, and validate results using CVS verification checks. It further specifies SSV calibration steps, including leak verification, temperature stability requirements, recorded mean inlet and differential pressures, determination of Cd versus Reynolds number, and allowable operating ranges. CFV calibration steps include configuring the system, maintaining inlet temperature, recording reference and pressure data across restrictor positions, deriving Cd and the highest allowable pressure ratio, and performing CVS verification.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/environmental-protection-agency-1065340/203547/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/environmental-protection-agency-1065340/203547.png","ImageObject",300,407,{"name":92,"@type":93},"supergirl","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-06","2026-09-04",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How is the PDP calibrated under § 1065.340?","Question",{"text":112,"@type":113},"Calibrate the PDP using collected data across restrictor positions, applying the equations in § 1065.640, then verify by performing a CVS verification (propane check) as described in § 1065.341.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are key requirements for SSV calibration in this section?",{"text":117,"@type":113},"Verify leaks are below 0.3% of total flow, keep SSV inlet temperature within ±2% of the mean absolute inlet temperature, operate long enough to stabilize, record mean flow and pressure quantities, then derive Cd as a function of Reynolds number using § 1065.640 criteria.",{"name":119,"@type":110,"acceptedAnswer":120},"How is the CFV calibration validated and limited for testing use?",{"text":121,"@type":113},"Determine Cd and the highest allowable pressure ratio r per § 1065.640, use Cd to compute CFV flow for emission tests, do not operate above the highest allowed r, and validate calibration with a CVS verification (propane check) per § 1065.341.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},203547,1788561771,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":81,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":39},962088121634,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Environmental Protection Agency § 1065.340  \ndata at a minimum of six restrictor positions ranging from the wide open restrictor position to the minimum expected pressure at the PDP inlet or the maximum expected differential (outlet minus inlet) pressure across the PDP during testing.  \n(9) Calibrate the PDP by using the collected data and the equations in § 1065 .640.  \n(10) Repeat the steps in paragraphs  \n(e)(6) through (9) of this section for each speed at which you operate the PDP.  \n(11) Use the equations in § 1065 .642 to determine the PDP flow equation for emission testing.  \n(12) Verify the calibration by performing a CVS verification (i.e. , propane check) as described in § 1065 .341.  \n(13) During emission testing ensure that the PDP is not operated either below the lowest inlet pressure point or above the highest differential pressure point in the calibration data.  \n(g) SSV calibration. Calibrate a subsonic venturi (SSV) to determine its calibration coefficient, Cd, for the expected range of inlet pressures. Calibrate an SSV flow meter as follows:  \n(1) Connect the system as shown in Figure 1 of this section.  \n(2) Verify that any leaks between the calibration flow meter and the SSV are less than 0.3% of the total flow at the highest restriction.  \n(3) Start the blower downstream of the SSV.  \n(4) While the SSV operates, maintain a constant temperature at the SSV inlet within ±2% of the mean absolute inlet temperature, ¯Tin.  \n(5) Set the variable restrictor or variable-speed blower to a flow rate greater than the greatest flow rate expected during testing. You may not extrapolate flow rates beyond calibrated values, so we recommend that you make sure the Reynolds number, Re\\# , at the SSV throat at the greatest calibrated flow rate is greater than the maximum Re\\# expected during testing.  \n(6) Operate the SSV for at least 3 minto stabilize the system. Continue operating the SSV and record the mean of at least 30 seconds of sampled data of each of the following quantities:  \n(i) The mean flow rate of the reference flow meter Ônref. This may in-  \nclude several measurements of different quantities for calculating Ônref, such as reference meter pressures and temperatures.  \n(ii) Optionally, the mean dewpoint of the calibration air, ¯Tdew. See § 1065 .640 for permissible assumptions.  \n(iii) The mean temperature at the venturi inlet, ¯Tin.  \n(iv) The mean static absolute pressure at the venturi inlet, ¯Pin.  \n(v) The mean static differential pressure between the static pressure at the venturi inlet and the static pressure atthe venturi throat, D¯PSSV .  \n(7) Incrementally close the restrictor valve or decrease the blower speed to decrease the flow rate.  \n(8) Repeat the steps in paragraphs  \n(g)(6) and (7) of this section to record data at a minimum of ten flow rates.  \n(9) Determine an equation to quantify Cd as a function of Re\\# by using the collected data and the equations in § 1065 .640. Section 1065.640 also includes statistical criteria for validating the Cd versus Re\\# equation.  \n(10) Verify the calibration by performing a CVS verification (i.e. , propane check) as described in § 1065 .341 using the new Cd versus Re\\# equation.  \n(11) Use the SSV only between the minimum and maximum calibrated Re\\# . If you want to use the SSV at a lower or higher Re\\# , you must recalibrate the SSV.  \n(12) Use the equations in § 1065 .642 to determine SSV flow during a test.  \n(h) CFV calibration. Calibrate a critical-flow venturi (CFV) to verify its discharge coefficient, Cd, up to the highest expected pressure ratio, r, according to § 1065 .640. Calibrate a CFV flow meter as follows:  \n(1) Connect the system as shown in Figure 1 of this section.  \n(2) Verify that any leaks between the calibration flow meter and the CFV are less than 0.3% of the total flow at the highest restriction.  \n(3) Start the blower downstream of the CFV.  \n(4) While the CFV operates, maintain a constant temperature at the CFV inlet within ±2% of t","cbCaif1Tx9MfQixp","https://ap.wps.com/l/cbCaif1Tx9MfQixp","pdf",281330,"English","# Environmental Protection Agency § 1065.340\n## PDP calibration steps\n## SSV calibration steps\n## CFV calibration steps","[{\"question\":\"How is the PDP calibrated under § 1065.340?\",\"answer\":\"Calibrate the PDP using collected data across restrictor positions, applying the equations in § 1065.640, then verify by performing a CVS verification (propane check) as described in § 1065.341.\"},{\"question\":\"What are key requirements for SSV calibration in this section?\",\"answer\":\"Verify leaks are below 0.3% of total flow, keep SSV inlet temperature within ±2% of the mean absolute inlet temperature, operate long enough to stabilize, record mean flow and pressure quantities, then derive Cd as a function of Reynolds number using § 1065.640 criteria.\"},{\"question\":\"How is the CFV calibration validated and limited for testing use?\",\"answer\":\"Determine Cd and the highest allowable pressure ratio r per § 1065.640, use Cd to compute CFV flow for emission tests, do not operate above the highest allowed r, and validate calibration with a CVS verification (propane check) per § 1065.341.\"}]","Environmental Protection Agency § 1065.340 | PDF"]