Definition(s)
Manifold
Manifold(s) include connection points for tie-in of the flowline(s) and/or umbilical back to the host facility, as well as connection points for the individual production wells. Manifolds require some type of framework to provide structural support of the various piping and valves, etc. Sometimes this framework and the manifold are incorporated into the towhead of a pipeline bundle, in which case this is commonly referred to as a PLEM. Alternatively, a separately installed template may be provided to support the manifold as described below.
Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards
Manifold
A manifold is a system of headers and branched piping that can be used to gather or distribute fluids, as desired. Typically manifolds include valves for controlling the on/off flow of fluids, and may also include other flow control devices (e.g. chokes) if these are not mounted on the individual subsea trees.
Manifolds can be used to gather produced fluids and direct selected wells to a well test line, as well as to distribute injected fluids (gas or water) or gaslift gas to individual wells. An alternative to the use of individual valves on each branch line is the use of a multiport selector which can be remotely switched to direct a desired well into a test line for instance, while leaving all other wells flowing into the main production line.
Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards
Manifold
Length of pipe with multiple connections for collecting or distributing drilling fluid.
Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards
Manifold
Piping system for the collection and/or distribution of a fluid to or from multiple flow paths.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards
Manifold
An assemblage of pipe, valves, and fittings by which fluid from one or more sources is selectively directed to various systems or components.
Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global Standards
Manifold
A system of pipe and valves that serves to convert separate flows into one flow, to divide one flow into separate parts, or to re route a flow to any one of several possible destinations.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards