13.2 We are dealing with an interpretation of a paragraph of API 560, 2nd Edition that we would like to clarify with you. The Equipment Director must also include for some corrosion allowance and a casting factor when designing the tube support itself. 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. API Standard 560 'Fired Heaters for General Refinery Services'.Īs such, the highest metallurgy of choice is cast 25 Cr/20 Ni, unless dirty fuels are being used. (PROJECT STANDARDS AND SPECIFICATIONS) TABLE OF CONTENT SCOPE 2 REFERENCES 2. 5 (2016) Fired Heaters For General Refinery Service from SAI Global. 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.īuy API 560 Ed. Also, please clarify if any more temperature allowance shall be kept over and above the values specified in the standard. Kindly clarify if these temperature allowances cater for end of run conditions in the fouled convection section. 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). API Standard 560 Fired Heaters for General Refinery Services Last Updated: FebruQuestion Reply 6.1 We have a specific query on the guidelines laid down for design of tube support castings.
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