HollyFrontier will take appropriate corrective action for new Covered Heaters designed and planned for installation, as described in Sections 3.2 and 4.3, that are not designed or installed in compliance with API 560. HFEDR will take appropriate corrective action for new Covered Heaters designed and planned for installation, as described in Sections 3.2 and 4.3, that are not designed or installed in compliance with API 560. The Covered Heaters included in the scope of this Protocol are all existing Fired Heaters at the Refinery within Covered Processes (i.e., cabin heaters, box heaters, and vertical cylindrical heaters with firebox burners) as described in API 560 section 4.3 and API 560 figure 1 and as certified by HFEDR in Attachment A hereto. The Equipment Director must also include for some corrosion allowance and a casting factor when designing the tube support itself"Įdited by Saml, 25 January 2018 - 11:40 PM.All new, proposed Covered Heaters that have been designed and planned for installation by the time the viewport assessments required by this Section are conducted will be reviewed to ensure the design is in compliance with API 560.ĪPI 560 and NFPA 85 should be used as references in the design of fired heaters and boilers. No further temperature allowances are presumed to be necessary, but the Equipment Designer must make that decision. The additional design temperature allowances of 100 degrees F and 200 degrees F are necessary in consideration of such factors as: EOR conditions some fouling of radiant and convection coils (which results in less cooling effects on the tube supports) calculation safety margins etc. As such, the highest metallurgy of choice is cast 25 Cr/20 Ni, unless dirty fuels are being used. "In responding to this inquiry, the Engineering Consultant is reminded that API Standard 560 is written to cover fired heaters used in General Refinery Service, wherein the bridgewall temperature is not likely to exceed 1600 degrees F. Kindly clarify if these temperature allowances cater for end of run conditions in the fouled convection section.Īlso, please clarify if any more temperature allowance shall be kept over and above the values specified in the It is stipulated in clause 6.1.1 that the temperature allowance of 200 degrees F for radiant section, 100 degrees F for convection section shall be used. We would like to draw your attention to the recommendation made in respect of design temperature for tube sheets in the convection section (Section 6).
" We have a specific query on the guidelines laid down for design of tube support castings. There is this one that seems to inidicate that the margin is intended for usual deviation from the design point and that the first option listed above mithg be the rigth one Update: After additional search in API Interpretations. Or that it should be protected from going above 960 ☌ (maintaining the 110 ☌ margin) ? That the fired heater should be protected from reaching 1070 ☌ in that section? (provided that other limits like tube wall temperature or process temperature are not reached before) ? Tube Support Design Temperature 1070 ☌ made of A351 Gr HK40 Those 110☌ are a "safety margin" for normal operation fluctuation? Or those 110☌ margin should be maintained during normal operation?ĭesign case is 940 ☌ flue gas temperature for the shield tubes supports.
#API 560 STANDARD PLUS#
To which the supports are exposed plus 110☌ (200☏)"
API 560 that tubes support for fired heaters design temperature should be " the flue gas temperature
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