A new version of ITSdesign has just been released. The new update now includes two span rafter systems for both API-650 11th Edition and AWWA D-100-05. The design includes inner and outer rafters, intermediate girders, center column, center column base plate, intermediate columns, and intermediate column base plate. You can choose different material grades for the girders than for the rafters allowing higher strength material for girders. A new "Loadings" report has been included to show the loadings on the columns and shell.
Look for more additions coming soon.
Tuesday, February 26, 2008
Tuesday, January 29, 2008
Correction
A correction to my previous post.
API-653 3rd Edition, Addendum 3 is currently under final review and will be released soon.
I apologize for the error.
API-653 3rd Edition, Addendum 3 is currently under final review and will be released soon.
I apologize for the error.
Monday, January 28, 2008
ITSdesign Update
We are just releasing an update to ITSdesign. A couple of corrections have been made and a couple of additions. One addition is that we now have an export to an Excel spreadsheet. We are seeking comments as to whether the format we have will satisfy the needs of the users. You can comment here or email me at its@innovativetanksolution.com. The other addition is adding tooltips to the entire program. If you place the cursor on an item you will get a note explaining the use of that particular item. Also, if it is yellowed, which indicates that an error has occured concerning that particular item, additional information will be displayed concerning the error. That way you do not need to click on the Code Errors tab to see the errors.
Other notes of interest:
API-620 11th Edition appears to be in final review and will be released soon
API-650 3rd Edition, Addendum 3, appears to be in final review and will be released soon
API-650 11th Edition, Addendum 1, has not been released for final review but is to be released soon and will be released shortly thereafter
We will be going to the API committe meetings in April and are getting ready to submit inquiries. If you have any inquiries you would like us to submit for you, contact us and we will see what we can do. Right now we are waiting to see what Addendum 1 changes are before we do the submission.
Other notes of interest:
API-620 11th Edition appears to be in final review and will be released soon
API-650 3rd Edition, Addendum 3, appears to be in final review and will be released soon
API-650 11th Edition, Addendum 1, has not been released for final review but is to be released soon and will be released shortly thereafter
We will be going to the API committe meetings in April and are getting ready to submit inquiries. If you have any inquiries you would like us to submit for you, contact us and we will see what we can do. Right now we are waiting to see what Addendum 1 changes are before we do the submission.
Wednesday, January 9, 2008
API-650 11th Edition now available
As of January 1, 2008, the API-650 11th Edition is now in effect. To meet this requirement we have revised ITSdesign to be in conformance with the new 11th edition. The updated version of ITSdesign is now available from our website at www.innovativetanksolution.com. Those currently using the program will receive the updates the next time they open the program. In addition to updating to the 11th edition, we have also added the base plate designs for center columns to conform to paragraph 5.10.4.7.
We have not revised the seismic portion of ITSdesign as what is in the 11th edition is incorrect and will be corrected in the soon to be released Addendum 1. As soon as that is released, we will revise the seismic to meet the Addendum 1 corrections.
Yes, there is an addendum scheduled to be released for API-650. The last word I received is that it would be released sometime in January. I will keep you informed as to when this does occur.
We have not revised the seismic portion of ITSdesign as what is in the 11th edition is incorrect and will be corrected in the soon to be released Addendum 1. As soon as that is released, we will revise the seismic to meet the Addendum 1 corrections.
Yes, there is an addendum scheduled to be released for API-650. The last word I received is that it would be released sometime in January. I will keep you informed as to when this does occur.
Thursday, December 27, 2007
API-650 11th Edition
It has been too long since I posted information concerning changes about the 11th Edition of API-650. Here is the next part having to do with changes in Section 5, which is design. This used to be Section 3.
5.1.3.6.1 specifies that multipass welding is required for manual welding processes on fillet weld legs or groove depths greater than ¼”. For semi-automatic and automatic welding processes multipass welding is required for welds greater than 3/8”. This applies to bottom plate welds, roof plate welds, and shell-to-bottom welds for Groups I, II, III and IIIA materials.
5.1.3.7 specifies that all attachments to the tank exterior shall be completely seal welded (intermittent welding is not permitted) except as specified in 5.1.5.8 for wind girders.
5.1.3.8 says permanent backing strips are not permitted (unless approved by the purchaser) except as permitted in 5.1.5.5 and 5.1.5.6 which is for butt-welded bottom plates.
5.1.5.1.b specifies that the top surfaces of bottom welds shall be ground flush where they will contact the bottoms of the shell, insert plates, or reinforcing plates.
5.1.5.8.b requires all horizontal bottom-side joints of wind girders shall be seal-welded unless specified otherwise by the purchaser. (Previously seal welding of the underside was only required if specified by the purchaser.)
5.1.5.9.c adds tension rings and compression rings to top-angle sections that require butt-welds shall have complete penetration and fusion.
5.2.3.d adds localized loads resulting from such items as ladders, stairs, platforms, etc., shall be considered.
5.3.1.2 specifies that sliding friction resistance shall be verified for tanks subject to lateral wind loads or seismic loads.
5.3.2 provides how corrosion allowances are to be applied. (Many of these had been scattered throughout the code or not specifically defined.)
5.4.4 specifies that unless otherwise specified, tank bottoms requiring sloping shall have a minimum slope of 1:120 upwards toward center of tank.
5.4.5 adds requirements for foundation drip rings if specified by the purchaser.
5.5.3 requires that if the product height times the specific gravity of the product exceeds 75 feet, then you must perform an elastic analysis to determine the annular plate thickness.
5.6.1.1 note 4 says that for diameters from 10.5 feet to 50 feet, the minimum thickness of the lowest shell course only is increased to ¼”. (The question is does this apply to field erected tanks or was this a note related to Appendix J tanks??)
5.6.1.5 adds that isolated radial loads on the tank shell, such as those caused by heavy loads on platforms and elevated walkways between tanks, shall be distributed by rolled structural sections, plate ribs, or built up members.
5.8.5 has been added to address the limitations for roof venting. Normal and emergency vents shall prevent the internal pressure from exceeding the pressure calculated in F.4.1 with some other limitations as well. Screen sizes are specified as being ½” nominal opening.
5.8.10 specifies platform, walkway, and stairway requirements. They have added that unless declined on the data sheet, a roof edge landing or gaugers platform shall be provided at the top of all tanks.
5.10.4.7 provides requirements for column bases. A ¼” wear plate seal welded to the floor is required or you can provided a thickened bottom plate that also distributes the load. Guides for the column to allow vertical movement of at least 3” are required and cannot be welded to the tank bottom. Several possible methods are given in Figure 5-26.
I will posting more soon. Also we will be releasing a revision to ITSdesign which will bring it into compliance with the 11th edition.
5.1.3.6.1 specifies that multipass welding is required for manual welding processes on fillet weld legs or groove depths greater than ¼”. For semi-automatic and automatic welding processes multipass welding is required for welds greater than 3/8”. This applies to bottom plate welds, roof plate welds, and shell-to-bottom welds for Groups I, II, III and IIIA materials.
5.1.3.7 specifies that all attachments to the tank exterior shall be completely seal welded (intermittent welding is not permitted) except as specified in 5.1.5.8 for wind girders.
5.1.3.8 says permanent backing strips are not permitted (unless approved by the purchaser) except as permitted in 5.1.5.5 and 5.1.5.6 which is for butt-welded bottom plates.
5.1.5.1.b specifies that the top surfaces of bottom welds shall be ground flush where they will contact the bottoms of the shell, insert plates, or reinforcing plates.
5.1.5.8.b requires all horizontal bottom-side joints of wind girders shall be seal-welded unless specified otherwise by the purchaser. (Previously seal welding of the underside was only required if specified by the purchaser.)
5.1.5.9.c adds tension rings and compression rings to top-angle sections that require butt-welds shall have complete penetration and fusion.
5.2.3.d adds localized loads resulting from such items as ladders, stairs, platforms, etc., shall be considered.
5.3.1.2 specifies that sliding friction resistance shall be verified for tanks subject to lateral wind loads or seismic loads.
5.3.2 provides how corrosion allowances are to be applied. (Many of these had been scattered throughout the code or not specifically defined.)
5.4.4 specifies that unless otherwise specified, tank bottoms requiring sloping shall have a minimum slope of 1:120 upwards toward center of tank.
5.4.5 adds requirements for foundation drip rings if specified by the purchaser.
5.5.3 requires that if the product height times the specific gravity of the product exceeds 75 feet, then you must perform an elastic analysis to determine the annular plate thickness.
5.6.1.1 note 4 says that for diameters from 10.5 feet to 50 feet, the minimum thickness of the lowest shell course only is increased to ¼”. (The question is does this apply to field erected tanks or was this a note related to Appendix J tanks??)
5.6.1.5 adds that isolated radial loads on the tank shell, such as those caused by heavy loads on platforms and elevated walkways between tanks, shall be distributed by rolled structural sections, plate ribs, or built up members.
5.8.5 has been added to address the limitations for roof venting. Normal and emergency vents shall prevent the internal pressure from exceeding the pressure calculated in F.4.1 with some other limitations as well. Screen sizes are specified as being ½” nominal opening.
5.8.10 specifies platform, walkway, and stairway requirements. They have added that unless declined on the data sheet, a roof edge landing or gaugers platform shall be provided at the top of all tanks.
5.10.4.7 provides requirements for column bases. A ¼” wear plate seal welded to the floor is required or you can provided a thickened bottom plate that also distributes the load. Guides for the column to allow vertical movement of at least 3” are required and cannot be welded to the tank bottom. Several possible methods are given in Figure 5-26.
I will posting more soon. Also we will be releasing a revision to ITSdesign which will bring it into compliance with the 11th edition.
Monday, August 13, 2007
API-650 Wind Design with I > 1 or Exposure D
API-650 provides the formulas for designing a tank for wind. However, the formulas are all based on a importance factor (I) = 1.0 and an exposure = C. If your requirements are for exposure D or an importance factor greater than 1.0, you have to modify all of the calculations. For the wind loadings you need to calculate a new horizontal load and a new vertical load using ASCE-7. For this you have to determine values for Kz, Kzt, Kd, G, Cf, and GCp from ASCE-7. From these values you can then calculate your new loadings. You also have to calculate a new horizontal loading based on the base wind velocity. To this you have to add the internal drag pressure specified in 3.9.7.1 and compare that to the base value used in the calculations for maximum wind girder spacing as well as for sizing requirements for wind girders.
The effect on your wind calculations is greatly dependent upon the height of your tank. The API-650 formulas are based on Kz = 1.04. For a short tank with exposure C, Kz could be equal to 0.85 which will give a lower horizontal wind load depending upon the importance factor. The vertical uplift from wind might increase depending upon the tank height. If you have a higher tank or a tank with exposure D these values will increase and will probably result in higher loadings on the tank.
The effect on the wind girder requirements for a short tank probably will not change as you cannot use a factor less than 1. The values will change for taller tanks, tanks with higher importance factors, and tanks in exposure D.
Because there is becoming more of a requirement for importance factors greater than 1.0 and the possibility of clients requiring exposure D, we have just released our new version of ITSdesign to include calculations based on ASCE-7 for these conditions. If you enter either a importance factor greater than 1.0 or exposure D, ITSdesign will automatically provide the calculations based on ASCE-7 requirements.
The effect on your wind calculations is greatly dependent upon the height of your tank. The API-650 formulas are based on Kz = 1.04. For a short tank with exposure C, Kz could be equal to 0.85 which will give a lower horizontal wind load depending upon the importance factor. The vertical uplift from wind might increase depending upon the tank height. If you have a higher tank or a tank with exposure D these values will increase and will probably result in higher loadings on the tank.
The effect on the wind girder requirements for a short tank probably will not change as you cannot use a factor less than 1. The values will change for taller tanks, tanks with higher importance factors, and tanks in exposure D.
Because there is becoming more of a requirement for importance factors greater than 1.0 and the possibility of clients requiring exposure D, we have just released our new version of ITSdesign to include calculations based on ASCE-7 for these conditions. If you enter either a importance factor greater than 1.0 or exposure D, ITSdesign will automatically provide the calculations based on ASCE-7 requirements.
Tuesday, August 7, 2007
API-650 11th Edition
There are changes from the API-650, 10th edition to the 11th edition. I will be reviewing some of these changes over the next several postings. So here goes!
Added new paragraphs 1.1.4 and 1.1.5 and revised 1.1.6 and 1.1.18 to specify that Appendix L data sheets are mandatory unless waived by the purchaser, all tanks and appurtenances shall comply with the data sheet and attachments, field tanks shall be furnished completely erected, tested, and ready for service connections unless specified otherwise, and shop tanks shall be furnish tested and ready for installation.
Added Appendix W providing recommendations covering commercial and documentation issues.
Added section 1.3 to outline the responsibilities of the parties involved.
Added section 1.4 to specify documentation requirements.
References was moved to section 2 instead of being a part of section 1.
Added section 3 to provide definitions.
Material are now in section 4 and have the following changes:
1) Rimmed or capped steels are not permitted.
2) Cast iron for pressure parts or for attachment by welding to the tank is prohibited.
3) Cadmium-plated components shall not be used without the consent of the purchaser.
4) Added section 4.7 on bolting stating that (unless otherwise specified on the data sheet) flange bolting shall be A193-B7, anchors shall be threaded A36 round bar with heavy hex nuts and shall be galvanized, and all other bolting shall be A307 or A193, and A325 may be used for structural purposes only.
5) Added section 4.8 on welding electrodes.
6) Added section 4.9 stating gasket material is to be specified on the data sheet and shall not contain asbestos unless specified by the purchaser. Gaskets shall be made with integral centering or positioning device. No sealing compound, adhesive, or lubricant shall be used unless specifically allowed by the purchaser. Spare gaskets are not required unless specified on the data sheet.
7) Test gaskets must have comparable dimensions and compressibility characteristics as service gaskets. Descriptions of gaskets for temporary use only as test gaskets shall be submitted for purchaser’s approval.
8) The test gasket for joints that will not be disassembled after testing must be the specified service gasket.
9) Flange bolts and nuts used for testing are acceptable for use in the completed tank except for stainless steel bolting.
This takes us through section 4. Next time we will continue our look at the changes in the 11th edition.
Added new paragraphs 1.1.4 and 1.1.5 and revised 1.1.6 and 1.1.18 to specify that Appendix L data sheets are mandatory unless waived by the purchaser, all tanks and appurtenances shall comply with the data sheet and attachments, field tanks shall be furnished completely erected, tested, and ready for service connections unless specified otherwise, and shop tanks shall be furnish tested and ready for installation.
Added Appendix W providing recommendations covering commercial and documentation issues.
Added section 1.3 to outline the responsibilities of the parties involved.
Added section 1.4 to specify documentation requirements.
References was moved to section 2 instead of being a part of section 1.
Added section 3 to provide definitions.
Material are now in section 4 and have the following changes:
1) Rimmed or capped steels are not permitted.
2) Cast iron for pressure parts or for attachment by welding to the tank is prohibited.
3) Cadmium-plated components shall not be used without the consent of the purchaser.
4) Added section 4.7 on bolting stating that (unless otherwise specified on the data sheet) flange bolting shall be A193-B7, anchors shall be threaded A36 round bar with heavy hex nuts and shall be galvanized, and all other bolting shall be A307 or A193, and A325 may be used for structural purposes only.
5) Added section 4.8 on welding electrodes.
6) Added section 4.9 stating gasket material is to be specified on the data sheet and shall not contain asbestos unless specified by the purchaser. Gaskets shall be made with integral centering or positioning device. No sealing compound, adhesive, or lubricant shall be used unless specifically allowed by the purchaser. Spare gaskets are not required unless specified on the data sheet.
7) Test gaskets must have comparable dimensions and compressibility characteristics as service gaskets. Descriptions of gaskets for temporary use only as test gaskets shall be submitted for purchaser’s approval.
8) The test gasket for joints that will not be disassembled after testing must be the specified service gasket.
9) Flange bolts and nuts used for testing are acceptable for use in the completed tank except for stainless steel bolting.
This takes us through section 4. Next time we will continue our look at the changes in the 11th edition.
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