The Dynamic Seal (also known as Purge Reducer or Velocity Type Seal) is used to direct the air from the inside wall of the flare stack to the centre of the flare tip.
As wind passes over the top of a flare tip, the tip is prone to catch some air which in turn follows down the low pressure zone against the inside wall of the flare tip. Without a Dynamic seal installed a substantially higher purge gas rate is required and there is no method of control to ensure that a combustible air / fuel mixture does not build below the Stainless Steel flare tip; creating an air / fuel mixture below the flare tip has the potential to cause an explosion or internal combustion, causing damage to the flare system. With a Dynamic Seal installed the purge gas rate is kept to a minimum.
The Dynamic Seal also creates a higher pressure zone by increasing the gas velocity, which also slightly increases the gas density helping to create a pressure envelope that the air will not pass through, all while reducing the purge gas down to a minimum.
To summarize, the Dynamic Seal is a safety feature that will ensure maximum efficiency and life expectancy of the flare system, save money on costly purge gas and reduce carbon emissions.
Dynamic Seal Welded Into Flare Tip
|SIZE||WELD-IN MODEL||MINIMUM PURGE RATE C/W DYNAMIC SEAL||MINIMUM PURGE W/O DYNAMIC SEAL||PURGE GAS REDUCTION|
|2”||FT-DS-2||3 SCFH||40 SCFH||92.5%|
|3”||FT-DS-3||7 SCFH||90 SCFH||92.2%|
|4”||FT-DS-4||13 SCFH||157 SCFH||91.7%|
|6”||FT-DS-6||30 SCFH||353 SCFH||91.5%|
|8”||FT-DS-8||50 SCFH||628 SCFH||92%|
|10”||FT-DS-10||80 SCFH||982 SCFH||91.9%|
|12”||FT-DS-12||118 SCFH||1414 SCFH||91.7%|
|14”||FT-DS-14||143 SCFH||1724 SCFH||91.7%|
|16”||FT-DS-16||190 SCFH||2283 SCFH||91.7%|
|18”||FT-DS-18||241 SCFH||2921 SCFH||91.7%|
|20”||FT-DS-20||298 SCFH||3638 SCFH||91.8%|
|22”||FT-DS-22||380 SCFH||5307 SCFH||92.8%|
|24”||FT-DS-24||435 SCFH||8400 SCFH||94.8%|
|30”||FT-DS-30||685 SCFH||12,200 SCFH||94.4%|
|36”||FT-DS-36||990 SCFH||15,125 SCFH||93.5%|
|42”||FT-DS-42||1353 SCFH||16,705 SCFH||91.9%|
|48”||FT-DS-48||1772 SCFH||21,920 SCFH||91.9%|
|54”||FT-DS-54||2247 SCFH||27,746 SCFH||91.9%|
|60”||FT-DS-60||2760 SCFH||34,225 SCFH||91.9%|