According to API 2000 code, the pressure relief valve with pipe away type of Model KSBD and KSDS are designed, manufactured and tested. Model KSBD and KSDS, which is used for the protector of fluid storage tank, is composed of pressure relief function.(Model KSDS is used for pressure setting above 1 PSIG). The vent valve should be the pipe away type for the condition of driving pressure and the retreatment of poisonous and flammable gas and steam. For this reason, TANK TECH has produced the Model KSBD and KSDS.
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in section "Pipeline valves"