Storage Tank Emissions Control-Some of the many design problems that exist in other well-known IFR brands
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IFR‘s are fitted for one reason- to stop vapours leaking to the atmosphere. Tank inspection periods run from between 10 years and up to 20 years in some industries so Why do operators buy cheap IFR’s that only Seal efficiently for 3-5 years?. Our stainless steel shoe seals IFR’s last for at least 25 years. We feel that our fitted IFR’s give the best life cycle cost through sound engineering solutions.
Here are Some of the many design problems that exist in other well-known IFR brands and How Assentech and Matrix Applied Technologies IFR’s overcome them
The picture above shows the following common problem:
Most IFR brands use Decking sheeting 0.50mm, Frequently we have found that damage to thin sheeting has occurred when workmen have been working on the IFR.
API 650 Appendix H used to specify a minimum deck sheeting thickness of 0.46mm (0.018”). This was recently increased to a minimum of 0.51mm (0.020”). A Lot of IFR brands on the market design the sheet based on 0.51mm but over 25 Experience shows that this is still too thin. Sheeting can corrode over the years depending on ambient air moisture levels.
Because we design our product to last and withstand the most extreme conditions Matrix Applied Technologies uses 0.6mm (0.024”) sheet as standard, with other thicknesses available on application. We believe that 0.6mm sheet offers a reasonable compromise between cost, weight & strength
The picture above shows the following common problems:
- Conventional IFR Structure showing rim and parallel main beams running at 90º to the pontoons.
- Pontoons are connected to the rim and to each other end-to-end.
- Landing legs are located at the pontoon end connections.
- Typical sheeting tears on conventional IFR’s having the legs connected to the pontoons
- Pontoon end cracking caused by flexing during operation, this is caused by landing on uneven tank floors or tank turbulence
Our Heavy Duty IFR has a proper frame, with regularly spaced cross beams; legs are connected to the frame & not to the pontoons. This eliminates the likelihood of pontoon end cracking (Pontoon end cracking is a common phenomenon with conventional design IFR’s due to in-tank turbulence).
In our Heavy duty IFR’s, main beam-to-rim connections are made so that the top of the main beam is flush with the top of the rim. This allows proper sheet clamping right to the rim. Most lightweight IFR designs run the main beams under the rim flange and then bolt to the rim. This does not allow proper sheet clamping at the rim.
The picture above shows the following problem:
Landing leg without insulating leg pad inserts can result in electrolysis between dissimilar metals (aluminium leg to steel floor). Additionally, the leg design shown, (if there is a seal between the leg & floor) could result in some flammable liquid retained in the leg, which would be dangerous in the event of hot-work in the tank.
The picture above shows the following common problem:
Weak sheet metal rim means rim distortion, rim leg movement, sheeting damage and also mean the rim cannot support an IFR Shoe Seal.
Our IFR’s design uses Extruded Rims: The Heavy duty rim we use in our IFR’s is better able to resist deformation caused by wave action in the tank. Frequent wave action occurs in the tank due to turbulence caused by pumping, use of gas mixers and gas slugs. These events especially gas slugs have been known to cause serious damage to lightweight sheet metal IFR rims. Having an Extruded Rims allow easy fitment of shoe seal without rim reinforcement
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Assentech- Geodesic Dome Installation
Assentech have supported our Navigator Terminal (formerly known as Vopak Teesside) on two important ~
projects by providing technical assistance and supplying and fitting a total of 11 Internal floating roofs. Both projects have been completed on schedule and on budget. Assentech have provided an excellent level of experience and front end engineering support with high quality drawings and documentation. Their specialist on site labour have worked collaboratively with us and Assentech have proven to be open, honest and flexible partners.
We have experience of both their Heavy Duty Pontoon type and Full Contact IFR’s and we continually monitor operation and performance of all lFR units Installed on site and consider the Assentech supplied Matrix brand to be the best in the market with exceptional build quality and rigidity. Our clients have inspected the installations and have always remarked upon the build quality and have been impressed with their strength in fully supporting up to four people without noticeable deformation. The design and construction of their stainless steel shoe seals continue to prove to operate excellently with no noticeable reduction in performance or flotation ability over the time since Installation.
Assentsch have proven to be extremely competitive on price and their installation and inspection activities have always been thorough. Navigator therefore have no hesitation in recommending Assentech to other companies considering their services.