Api 650 - H App
Enviado por hamr • 31 de Marzo de 2015 • 563 Palabras (3 Páginas) • 135 Visitas
Annex H
(normative)
Internal Floating Roofs
H.1 Scope
H.1.1 This Annex provides minimum requirements that apply to a tank with an internal floating roof and a fixed
roof at the top of the tank shell, and to the tank appurtenances. This Annex is intended to limit only those factors
that affect the safety and durability of the installation and that are considered to be consistent with the quality
and safety requirements of this standard. Types of internal floating roofs (listed under H.2) and materials (listed
under H.3) are provided as a basic guide and shall not be considered to restrict the Purchaser option of
employing other commonly accepted or alternative designs, as long as all design loading is documented to meet
the minimum requirements herein, and all other criteria are met (except alternative materials and thicknesses as
permitted by H.3.1). The requirements apply to the internal floating roof of a new tank and may be applied to an
existing fixed-roof tank. Section 5.10 of this standard is applicable, except as modified in this Annex.
H.1.2 The Purchaser is required to provide all applicable jurisdictional requirements that apply to internal floating roofs
(see 1.3).
H.1.3 See Annex W for bid requirements pertaining to internal floating roofs.
H.2 Types of Internal Floating Roofs
H.2.1 The internal floating roof type shall be selected by the Purchaser after consideration of both proposed and
future product service, operating conditions, maintenance requirements, regulatory compliance, service life
expectancy, ambient temperature, maximum design temperature, product vapor pressure, corrosion conditions and
other compatibility factors. Other operating conditions requiring consideration include (but are not limited to)
anticipated pumping rates, roof landing cycles, and the potential for turbulence resulting from upsets, such as vapor
slugs injected into the tank. Safety and risk factors associated with the roof types shall also be evaluated.26 The type
of roof, which shall be designated by the Purchaser on the Data Sheet, Line 30, shall be one of the types described in
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