Extruded Products

WHY EXTRUDED OUTLETS? DESIGN FLEXIBILITY-       The extruded outlet offers the piping engineer flexibility in the design configuration of manifolds and piping systems that is not practical using standard off-the-shelf fittings. The location of branch connections can be dictated by the design requirements rather than by standard fitting dimension constraints. Extruded outlets can be placed in the desired location on plane without sacrificing the stress distribution advantages provided by integrally reinforced contoured openings.

COST SAVINGS-       Extruded openings not only result in more compact systems, but the elimination of girth welds between outlets results in substantial additional savings. Reduced field labor input also lowers project costs and aids in controlling installation schedules.

BETTER DESIGN AND RELIABILITY-       Smoothly contoured intersections of tubular members such as forged tees, extruded outlets, and weld-in contoured fittings are superior to the more common weld-on or welded-in connection. Although each type of connection may be properly reinforced to tolerate the internal pressure for which it is designed, there is a large disparity in the ability of the connection to withstand applied external loads without failing. The extruded outlet allows the designer to elect an option from the B31 Codes that will allow latitude in configuration without giving up the security that the contoured opening provides.

BUILT-IN QUALITY-       The use of extruded outlet and weld-in contoured fittings brings with it the type of fitting that allows radiograhic inspection of attachment welds that are made outside of the most critical area of the connection. The weld-on and weld-in nozzles have welds in the most highly stressed area of the piping juncture and also present difficult to examine weld joints. Often the results of such examinations are difficult to evaluate even by the most experienced technicians.       Extruded manifolds that are "closed die" formed at ambient temperatures can be manufactured to very close tolerances. These close tolerance extrusions are of particular interest when manufacturing pulsation bottles that must fit compressor heads. Other applicatons that require close tolerance manufacture can also be accomodated using this process.

Product quality is built-in by the people who make the product. At Weldfit Corporation we do it right.

Closed Die Forming

Closed die forming allows precision control fo the outlet radii in the most critical load areas. Many of the ASME B31 codes require that radii be controlled within the limits shown below. These radii must be obtained by the forming process and not by machining operatins may reduce the wall thickness in the reinforcement area.

The external radius of curvature (ro) of the contoured portion of the outlet, measured in the plane containing the axes of the header and the branch shall be within the following limitations:

The maximum ro is the lesser of 0.05D or 1.5" (38mm) The maximum ro shall not exceed:

for Db < NPS 8, 1.25" (32mm) for Db < NPS 8, 0.1Db + 0.5" (13mm)

Where D = the outside diameter of the branch. Also, the radius of curvature must be equal to or less than the lip height above the run O.D.

Standard Outlet Heights
NPS	Height	NPS	Height
2"	1/2"	10"	1"
2-1/2"	9/16"	12"	1-1/8"
3"	5/8"	14"	1-7/16"
3-1/2"	11/16"	16"	1-11/16"
4"	11/16"	18"	1-13/16"
5"	3/4"	20"	2"
6"	3/4"	22"	2-1/16"
8"	7/8"	24"	2-3/16"

Header Manufacturing Data

Dimension	Limits	Comments
d	MIN = 1-1/2" MAX = 24"	Full size outlets can be made on certain combinations of diameter and wall thickness.
D	MIN = 4" NPS	The maximum run diameter is restricted only by the material handling capability and shipping restrictions.
C	MIN=dn + 2t	Maximum center-to-end dimension is limited only raw material size and economic considerations.
M	MIN=d1 + d2	Maximum center distance is limited as noted for normal designs. The piping codes allow closer spacing when appropriate consideration is given to reinforcement encroachment.
t	MIN=.250" MIN=2.5"	This limitation is made for practical reasons associated with manufacturing restrictions and is not a limiting factor for design or piping codes.

Header Outside diameter	Minimum Allowance for Clean Up
< 26"	1/8"
26" - 42"	1/4"
> 42"	3/8"
Bevel Allowance Requirements

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