MSS SP-79 Forged Socket Welding Reducer Inserts

High Strength / Corrosion Resistance / Tight Connection / High Dimensional Accuracy / Easy Installation

High Quality Forged Socket Welding Reducer Inserts

SSM designs and manufactures Forged Socket-Welding Reducer Inserts according to MSS SP 79, ensuring reliable connections in piping systems, especially in high-pressure and high-temperature environments such as petrochemical, power generation, and shipbuilding industries.

MSS SP-79 Forged Socket Welding Reducer Inserts Sizes and Pipe Correlation

Class Designation	Sizes		Pipe Used For Rating Purposes	Wall Designation
Class Designation	NPS	DN	Pipe Used For Rating Purposes	Wall Designation
3000	1/8-4	6 -100	Schedule 80	XS
6000	1/8-3	6 – 80	Schedule 160	/

MSS SP-79 Forged Socket Welding Reducer Inserts by Types

Type 1

TYPE 1: Refers to the butt-welding type socket-welding reducer insert, designed for connection to pipes through butt welding, suitable for high-pressure and high-temperature applications.

Size: 1/8-4″
Materials: Carbon Steel, Stainless Steel, Nickel Alloy, Cooper Nickel Alloy …

Type 2

TYPE 2: Refers to the socket-welding type reducer insert, which is connected by inserting into the pipe and welding, commonly used in small-diameter piping systems, suitable for high-pressure and high-temperature applications.

Size: 1/8-4″
Materials: Carbon Steel, Stainless Steel, Nickel Alloy, Cooper Nickel Alloy …

MSS SP-79 Forged Socket Welding Reducer Inserts By Materials

The material for fittings shall consist of forgings, bar, seamless pipe, or tubular products, which conform to the requirements of WP seamless construction materials of the ASTM Fitting Specification A234/A234M, A403/A403M, A420/A420M, A815/A815M and/or B366/B366M, or the ASTM Forging Specification(s) A105/A105M, A182/A182M, A350/A350M, B462 or B564.

MSS SP-79 Forged Socket Welding Reducer Inserts Applications

MSS SP-79 Fittings are widely used across various industries.

Petrochemical Industry: Used for pipe connections in high-pressure, high-temperature media transport.
Power Plants: Applied in boiler and steam piping systems for reliable connections.
Shipbuilding Industry: Used in ship piping systems, providing high strength and reliability.
Oil and Gas Transportation: Suitable for high-pressure pipe connections, ensuring safe and stable transport.
Pharmaceutical and Chemical Plants: Used in piping systems handling corrosive media, offering long-lasting durability.

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More Information About MSS SP-79 Forged Socket Welding Reducer Inserts

This Standard Practice covers ratings, dimensions, tolerances, finish, marking and material requirements for socket-welding reducer inserts for use with ASME B16.11, Class 3000 and 6000 socket-welding fittings. U.S. customary unit dimensions for these reducer inserts are shown in Table 3 and SI (metric) dimensions are shown in Table 3M.

RATINGS

General These fittings shall be designated as Class 3000 and Class 6000.

Rating Basis The schedule of pipe corresponding to each Class of fitting for rating purposes is shown in Table 1. Design temperature and other service conditions shall be limited as provided by the applicable piping code of regulation for the material of construction of the fitting. Within these limits the maximum allowable pressure of a fitting shall be that computed for straight seamless pipe of equivalent material (as shown by comparison of composition and mechanical properties in the respective material specifications). The wall thickness used in such computation shall be that tabulated in ASME B36.10M for the size and applicable manufacturing tolerances and other allowances.

Any corrosion allowance and any variation in allowable stress due to temperature or other design shall be applied to the pipe and the fitting alike.

Non-Standard Pipe Wall Thickness Since ASME B36.10M does not include Schedule 160 thickness for NPS 1/8 (DN 6), NPS 1/4 (DN 8), and NPS 3/8 (DN 10), the values in Table 2 may be used as the nominal wall thickness of the pipe for rating purposes.

Nominal Wall Thickness of Schedule 160 Pipe: NPS 1/8 (DN 6), NPS 1/4 (DN 8), and NPS 3/8 (DN 10)