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Corrosion-resistant Bolting for Use in the Petroleum and Natural Gas Industries
API SPEC 20F (Standard + Revision Tracker) : 2018
Full Description
This standard specifies requirements for the qualification, production, and documentation of corrosion-resistant bolting used in the petroleum and natural gas industries. This standard applies when referenced by an applicable API equipment standard or otherwise specified as a requirement for compliance. This standard establishes requirements for two bolting specification levels (BSL). These two BSL designations define different levels of technical, quality, and qualification requirements: BSL-2 and BSL-3. The BSLs are numbered in increasing levels of requirements in order to reflect increasing technical, quality, and qualification criteria. BSL-2 and BSL-3 are intended to be comparable to BSL-2 and BSL-3 as found in API 20E. BSL-1 is omitted from this standard.
This standard covers the following product forms, processes, and sizes:
a) machined studs;
b) machined bolts, screws, and nuts;
c) cold-formed bolts, screws, and nuts with cut or cold-formed threads;
d) hot-formed bolts and screws <1.5 in. (38.1 mm) nominal diameter;
e) hot-formed bolts and screws ≥1.5 in. (38.1 mm) nominal diameter;
f) roll threaded studs, bolts, and screws <1.5 in. (38.1 mm) diameter;
g) roll threaded studs, bolts, and screws ≥1.5 in. (38.1 mm) diameter;
h) hot-formed nuts <1.5 in. (38.1 mm) nominal diameter;
i) hot-formed nuts ≥1.5 in. (38.1 mm) nominal diameter.
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