API SPEC 11IW Recommended Practice for Independent Wellhead Equipment - First Edition
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American Petroleum Institute
Recommended Practice for Independent Wellhead Equipment - First Edition
N SPEC 11IW
Annotation
PURPOSE
This specification was formulated to provide for the availability of safe, dimensionally and functionally interchangeable independent wellhead equipment. The technical content provides requirements for performance, design, materials, testing, inspection, welding, marking, handling, storing and shipping.
APPLICATIONS
Coverage
This specification covers the independent wellhead equipment utilized for pressure control systems for the production of oil and gas. Specific equipment covered by this specification is listed as follows:
a. Independent wellheads.
b. Top connectors.
c. Tubing and casing slip hangers.
d. Tubing and cashing mandrel hangers.
e. Packoffs.
f. Belled nipples.
g. Connector flanges.
h. Stripper adapters.
The typical equipment nomenclature used in this specification is shown in Figures 1, 2, 3, and 4.
Service Conditions
General
Service conditions refer to classifications for pressure, temperature, and the various well-bore fluid and operating conditions.
