UL 142:2019 pdf download.Steel Aboveground Tanks for Flammable and Combustible Liquids.
12.2 The steel thickness of tanks storing liquids with a specific gravity greater than 1.0 shall be determined by one of the following methods.
a) Vertical tanks with flat bottoms and without supports: Calculate the equivalent height of the tank by multiptying the desired tank height by the desired specific gravity. The resulting equivalent height shall be used in Table 15.1 to determine the steel thickness. The same method shall be used for determining the secondary tank steel thickness for secondary containment tanks
b) The tank shall be evaluated per the requirements of Section 4, Hydrostatic Strength Test, except the test pressure shall be two times the calculated tank bottom pressure based on the maximum anticipated specific gravity when the tank is filled to the maximum height.
C) Tank construction shall be evaluated by a Professional Engineer using calculations or analytical tools fOr approval using the maximum anticipated specific gravity. The calculations or analysis shall be based on two times the weight of a full tank containing the maximum specific gravity liquid.
d) Integral supports for all tanks shall be evaluated per Part IV Tank Supports, except the support load test or evaluations shall be based on two times the weight of a full tank containing the maximum specific gravity liquid.
13 Tanks With Bottoms Other Than Flat
13.1 Tanks with bottoms other than flat such as a cone. dish or wedge shape. shall be constructed with steel at least as thick as the shell, using any of the joints in Section
13.2 The strength of the assembly of these tanks shall be determined by one of the following methods:
a) Tank design shall be tested to demonstrate the strength of the assembly per the Hydrostatic Strength Test in Section 43., or
b) Tank construction shall be evaluated by a Professional Engineer using calculations or analytical tools for approval. The calculations or analysis shall be based on two times the weight of a full tank.
13.3 These tanks shall be provided with integral supports that are evaluated to Part IV Tanks Supports.
a) Vertical tanks with flat bottoms and without supports: Calculate the equivalent height of the tank by multiptying the desired tank height by the desired specific gravity. The resulting equivalent height shall be used in Table 15.1 to determine the steel thickness. The same method shall be used for determining the secondary tank steel thickness for secondary containment tanks
b) The tank shall be evaluated per the requirements of Section 4, Hydrostatic Strength Test, except the test pressure shall be two times the calculated tank bottom pressure based on the maximum anticipated specific gravity when the tank is filled to the maximum height.
C) Tank construction shall be evaluated by a Professional Engineer using calculations or analytical tools fOr approval using the maximum anticipated specific gravity. The calculations or analysis shall be based on two times the weight of a full tank containing the maximum specific gravity liquid.
d) Integral supports for all tanks shall be evaluated per Part IV Tank Supports, except the support load test or evaluations shall be based on two times the weight of a full tank containing the maximum specific gravity liquid.
13 Tanks With Bottoms Other Than Flat
13.1 Tanks with bottoms other than flat such as a cone. dish or wedge shape. shall be constructed with steel at least as thick as the shell, using any of the joints in Section
13.2 The strength of the assembly of these tanks shall be determined by one of the following methods:
a) Tank design shall be tested to demonstrate the strength of the assembly per the Hydrostatic Strength Test in Section 43., or
b) Tank construction shall be evaluated by a Professional Engineer using calculations or analytical tools for approval. The calculations or analysis shall be based on two times the weight of a full tank.
13.3 These tanks shall be provided with integral supports that are evaluated to Part IV Tanks Supports.
