The Piggable Y Fitting (PYF) allows pigs to pass from a full-size or reducing lateral line into a trunk line. It provides two inlets separated by an angle of approximately 30°. The angle may be more or less for intelligent pigs, depending on pipe diameter and pig manufacturer, and the configuration can be either symmetrical or asymmetrical.
The Piggable Y Fitting will pass commonly used pigs, including foam-type swab pigs, articulated scraper pigs, spheres, batching pigs, gauging pigs, and intelligent pigs. In general, pigs longer than 1.5 to 2.0 times the nominal pipe diameter should be articulated, and gauging pigs should be assembled with gauging plates mounted on the rear end of the pig rather than on the front end. The Piggable Y Fitting is available with either a weld-end configuration or with flanges and pipe pups. PYFs can be designed to suit all ANSI or API pressure ratings for most pipe sizes.
The Divertable Piggable Y facilitates bi-directional pigging. Primary components of the Divertable Piggable Y are the body, rotor, bonnet, bottom flange closure, two branch nozzles, and a trunk nozzle. The rotor contains a pressure-piping bend, which can be rotated by a diver, ROV, or hydraulic actuator to direct a pig through either branch in either direction. Design options may either allow or restrict flow to the adjacent branch.
The body is a cylindrical housing that serves as a pressure vessel and contains the rotor. The rotor stem protrudes through the bonnet to permit actuation by a diver using a hand wheel, by an ROV via a torque bucket, or by a hydraulic actuator/umbilical.
The rotor rotates within the body housing to align the branch and trunk nozzles for pigging. The rotor does not form a pressure-tight seal between the pressure-piping bend and the body at the branch and trunk nozzles; this facilitates easy rotation of the rotor within the body.
Piggable Y Fittings are designed in accordance with ASME Pressure Vessel Code, Section VIII, Division 2, unless another recognized code is specified. Material and configuration of the butt-weld ends are in accordance with ASME B16.5 or MSS SP-44 to match the pipeline.
Please provide the following information on any purchase order or request for quotation:
• Nominal pipe sizes
• Pipe wall thicknesses or bores
• Pipe grades
• Design rating
• Symmetrical or asymmetrical configuration
• Butt-weld ends, butt-weld extension nipples, or flanged
inlets and outlet
• Specification for weld-neck flanges, if applicable
• Gasket type, if applicable
• Pig types anticipated, if known
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Symmetrical Piggable "Y" Fitting
Symmetrical Piggable "Y" Fitting
Butt-Weld Extension Nipples
Asymmetrical Piggable "Y" Fitting
Butt-Weld Extension Nipples
Divertable Piggable "Y" Fitting
Can Divert Pigs without Interrupting Flow
Divertable Piggable "Y" Fitting
Butt-Weld Ends
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Oil States Industries, Inc.
Oil States International, Inc.