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8.1.1 Type I —Tanks molded from cross-linkable polyethylene resin. <br />8.1.2 Type II - Tanks molded from linear polyethylene resin (not cross-linkable resin). <br />8.2 The material used shall be virgin polyethylene resin as compounded and certified by the <br />manufacturer. Type I tanks shall be made from crosslinked polyethylene (XLPE) resin as <br />manufactured by ExxonMobil Chemical, or resin of equal physical and chemical properties. <br />Type II tanks shall be made from high density linear polyethylene (HDLPE) resin as <br />manufactured by ExxonMobil Chemical, or resin of equal physical and chemical properties. <br />8.3 All polyethylene resin material shall contain a minimum of a U.V. 15 stabilizer as <br />compounded by the resin manufacturer. Pigments may be added at the purchaser's <br />request, but shall not exceed 0.25% (dry blended) of the total weight. <br />8.4 Mechanical Properties of Type I tank material: Cross-linked (XLPE) <br />PROPERTY <br />ASTM <br />VALUE <br />Density (Resin) <br />D1505 <br />0.938-0.946 g/cc <br />Tensile (Yield Stress 2"/min) <br />D638 <br />2830 - 3000 PSI <br />Elongation at Break (2"/min.) <br />D638 <br />700-800% <br />ESCR (100% Igepal, Cond. A, F50) <br />D1693 <br />>1000 hours <br />ESCR (10% Igepal, Cond. A, F50) <br />D1693 <br />>1000 hours <br />Vicat Softening Degrees F. Temperature <br />D1525 <br />250 <br />Flexural Modulus <br />D790 <br />87,000 —110,000 PSI <br />8.5 Mechanical Properties of Type II tank material: High density Linear (HDLPE) <br />PROPERTY <br />ASTM <br />VALUE <br />Density (Resin) <br />D1505 <br />0.941-0.948 g/cc <br />Tensile (Yield Stress 2"/min) <br />D638 <br />3000 PSI <br />Elongation at Break (2"/min.) <br />D638 <br />>1000% <br />ESCR (100% Igepal, Cond. A, F50) <br />D1693 <br />550 hours <br />ESCR (10% Igepal, Cond. A, F50) <br />D1693 <br />50 hours <br />Vicat Softening Degrees F. Temperature <br />D1525 <br />235 <br />Flexural Modulus <br />D790 <br />130,000 PSI <br />9. Design Requirements <br />9.1 The minimum required wall thickness of the cylindrical shell at any fluid level shall be <br />determined by the following equation, but shall not be less than 0.187 in.�����® <br />T = PxO.D./2 SD= 0.433 x S.G. x H x O.D./2 SD <br />T = wall thickness JUL 2 8 2014 <br />SD = hydrostatic design stress, PSI <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />