Carbon Steel Weldolet

Carbon Steel Weldolets are branch outlet fittings used to make a connection between a smaller branch pipe and the main pipeline, and are used to help distribute stress around the branch connection. These forged fittings, made of ASTM A105 carbon steel, provide a reliable strength and durability for industrial piping systems. They are offered in butt-weld, socket-weld and threaded types and vary in size and surface finish to suit project needs. Carbon Steel Weldolets are extensively utilized for branch connection in piping and process systems requiring reliable mechanical characteristics. Solitaire Overseas produces and delivers ASTM A105 Carbon Steel Weldolets made with consistent quality, inspection documentation, reliable delivery and customized sizes to meet domestic and international industry demands.

Technical Data

Specifications Chemical Composition Mechanical Properties Dimensions Chart Weight Chart Pressure Rating

ASTM A105 Carbon Steel Weldolet Specifications

Specification / Feature	Technical Details & Standard Compliance
Product Name	Carbon Steel Weldolet (Forged Butt-Weld Branch Outlet Fitting)
Primary Material	Forged Carbon Steel ASTM A105 / A105N (A105 is standard; A105N is supplied in normalized condition where required by project specifications)
Alternative Forged Materials	Stainless Steel (ASTM A182 F304/F316), Duplex & Super Duplex Steel, Alloy Steel (ASTM A182 F11/F22/F91), Nickel Alloys (Inconel, Hastelloy), Copper Nickel
Outlet Size Range	1/2″ to 24″ NB (Confirm against active mill stock)
Run / Header Size Range	1/2″ to 48″ NB (and flat runs above)
Wall Thickness / Schedules	Matched to branch pipe schedule: STD, XS, Schedule 80, Schedule 160, XXS
End Connection	Butt-weld outlet, beveled to ASME B16.25; contour-beveled run base welded to header pipe
Pressure Rating Basis	Not class rated. Rated by matching run and branch pipe schedules; design governed by ASME B31.1 (Power Piping) or ASME B31.3 (Process Piping)
Governing Standards	• MSS SP-97: Integrally Reinforced Forged Branch Outlet Fittings • ASME B16.25: Butt-Welding Ends • ASME B31.1 / B31.3: Piping Design Codes
Documentation & Certification	Raw Material Test Reports (RMTR), Mill Test Certificates (MTC per EN 10204 3.1 / 3.2), NACE MR0175 / MR0103 compliance

Chemical Compositions of Carbon Steel Weldolet

Element	Composition (%)
Carbon (C)	0.35 max
Silicon (Si)	0.10–0.35
Manganese (Mn)	0.60–1.05
Phosphorus (P)	0.035 max
Sulfur (S)	0.040 max
Chromium (Cr)	0.30 max
Nickel (Ni)	0.40 max
Molybdenum (Mo)	0.12 max
Copper (Cu)	0.40 max
Vanadium (V)	0.08 max

Carbon Steel Weldolet Mechanical Properties

PROPERTY	REQUIREMENT
Tensile Strength (min)	70,000 psi (485 MPa)
Yield Strength (min)	36,000 psi (250 MPa)
Elongation in 2 in (min)	22%
Reduction of Area (min)	30%
Hardness (max)	187 HB

Dimensions Chart of Carbon Steel Weldolet

Run Pipe Size (NPS)	Schedule	2″	3″	4″	6″	8″	10″	12″	14″	16″	18″	20″	24″
2″	STD-40 / XS-80	70	—	—	—	—	—	—	—	—	—	—	—
2″	XXS-160	87	—	—	—	—	—	—	—	—	—	—	—
3″	STD-40 / XS-80	84	91	—	—	—	—	—	—	—	—	—	—
3″	XXS-160	101	111	119	—	—	—	—	—	—	—	—	—
4″	STD-40 / XS-80	97	103	111	—	—	—	—	—	—	—	—	—
4″	XXS-160	114	132	144	—	—	—	—	—	—	—	—	—
6″	STD-40	124	130	138	148	—	—	—	—	—	—	—	—
6″	XS-80	124	130	138	165	—	—	—	—	—	—	—	—
6″	XXS-160	141	159	171	192	—	—	—	—	—	—	—	—
8″	STD-40	149	156	164	176	183	—	—	—	—	—	—	—
8″	XS-80	149	156	164	191	197	—	—	—	—	—	—	—
8″	XXS-160	167	184	197	218	224	—	—	—	—	—	—	—
10″	STD-40	176	183	191	205	210	218	—	—	—	—	—	—
10″	XS-80	176	183	191	218	238	235	—	—	—	—	—	—
10″	XXS-160	194	211	224	245	251	265	—	—	—	—	—	—
12″	STD-40	202	208	216	228	255	245	251	—	—	—	—	—
12″	XS-80	202	208	216	243	264	267	265	—	—	—	—	—
12″	XXS-160	219	237	249	270	276	291	324	—	—	—	—	—
14″	STD-40	218	224	232	245	251	259	267	270	—	—	—	—
14″	XS-80	218	224	231	239	279	270	278	286	—	—	—	—
16″	STD-40	243	249	257	270	276	284	292	295	300	—	—	—
16″	XS-80	243	249	257	284	305	293	303	306	319	—	—	—
18″	STD-40	268	275	283	295	302	310	318	321	325	335	—	—
18″	XS-80	268	275	283	310	330	321	329	332	338	352	—	—
20″	STD-40	294	300	308	321	327	335	343	346	351	356	376	—
20″	XS-80	294	300	308	335	356	346	354	557	364	370	386	—
24″	STD-40	345	351	359	372	378	386	394	397	402	406	411	446
24″	XS-80	345	351	359	386	406	397	405	408	414	421	429	449

Weight Chart of Carbon Steel Weldolet

Size (NPS)	Weight (kg)
1/2″	0.11
3/4″	0.32
1″	0.38
1-1/4″	0.57
1-1/2″	0.79
2″	0.97
2-1/2″	1.53
3″	2.87
4″	4.76
5″	6.46
6″	12.70

Pressure Rating Chart of Carbon Steel Weldolet

Pressure-Temperature for ASTM A105 Carbon Steel Weldolet (psig)

Temperature (°F)	Temperature (°C)	Class 150	Class 300	1/4 - 1 inch	1 1/4 - 2 inch
-20 to 150	-29 to 66	300	2000	1500	1000
200	93	265	1785	1350	910
250	121	225	1575	1200	825
300	149	185	1360	1050	735
350	177	150	1150	900	650
400	204	-	935	750	560
450	232	-	725	600	475
500	260	-	510	450	385
550	288	-	300	300	300

Applications and Industrial Uses of Carbon Steel Weldolet

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Shipbuilding Industry
Mining Industry
District Heating Systems
HVAC and Refrigeration Industry
Desalination Industry
Pulp and Paper Industry
Steel Manufacturing Industry
Industrial Gas Processing Industry

Frequently Asked Questions

What is a Carbon Steel Weldolet?

A Carbon Steel Weldolet is a forged branch outlet fitting used to connect a smaller branch pipe to a larger main pipe through a butt-weld connection.

What is the difference between a Weldolet and a Sockolet?

A Weldolet uses a butt-weld connection, while a Sockolet uses a socket-weld connection. Weldolets are generally preferred for larger branch connections.

What pressure classes are available for Carbon Steel Weldolets?

Carbon Steel Weldolets are commonly available in Class 3000, Class 6000, and Class 9000, depending on the fitting design and application requirements.

How is a Weldolet welded to a pipe?

The Weldolet is positioned on the main pipe, the branch opening is prepared, and the fitting is joined to the pipe using a butt-welding process according to the applicable welding procedure.

What is the difference between a Weldolet and a Tee?

A Weldolet creates a branch connection directly on the main pipe, while a Tee is a complete pipe fitting with three openings and is installed as part of the pipeline.

Can ASTM A105 Weldolets be used for high-pressure piping?

Yes. ASTM A105 Weldolets can be used in high-pressure piping when the correct pressure class, dimensions, material condition, and applicable piping design requirements are selected.

When does a Weldolet replace a reinforcing pad?

A Weldolet can replace a reinforcing pad when its integral reinforcement provides the required pressure-boundary strength. It eliminates extra pad welds, reduces corrosion-prone crevices, and allows easier inspection.