Where to buy weldolet?

What is a weldolet?

Weldolet is the kind of pipe fitting used to make a branch with the littler size of primary pipe. Weldolet normally utilized as a part of piping with high pressure weight and temperature where the connection with the joint type butt weld. Weldolets are principally sorted as butt weld fittings, as these are welded into the branch pipe. The principle favorable position of weldolets is that it limits stress focus as are well-suited for high pressure weight applications.

Specification of Weldolets	Tees vs Weldolet
Dimensions Weldolet	Weldolet Vs Sweepolet
How to weld a weldolet	How to install a Weldolet
How much weld metal is needed in a weldolet connection	Where to buy weldolet

Specification of Weldolets

• Type: Forge Pipe Olets / Forge Pipe Outlets
• 1) Size: 1/8″NB TO 4″NB (DN6 x DN100)
• 2) Class: 3000 LBS, 6000 LBS & 9000 LBS (Sch40, Sch80/Xs Sch160 Xxs)
• 3) Standards: ASME/ANSI B16.11, MSS-SP-97, MSS-SP-79, JIS B2316, BS 3799, etc
• 4) Connect Type: Welded, threaded, BW, SW
• 5) Materials: Stainless steel: ASTM A182 F304, F304L, F316, F316L, F317L, F321, F321H, F347, F347H, F310, F44F51, S31803, A182, F43, S32750

Dimensions Weldolet Size on Size -STD- MSS SP97

Dimensions NPS 1/2 to 24

NPS	A	B	C	D
1/2	3/4 19.05	1.3/8 34.93	15/16 23.81	5/8 15.88
3/4	7/8 22.23	1.5/8 41.28	1.3/16 30.16	13/16 20.64
1	1.1/16 26.99	2 50.80	1.7/16 36.51	1.1/32 26.19
1¼	1¼ 31.75	2.3/8 60.3	1.3/4 44.45	1.3/8 34.93
1½	1.5/16 33.34	2.7/8 73	2 50.80	1.5/8 41.28
2	1½ 38.10	3½ 88.90	2.9/16 65.09	2.1/16 52.39
2½	1.5/8 41.28	4.1/16 103.19	3 76.20	2.7/16 61.91
3	1.3/4 44.45	4.13/16 122.24	3.11/16 93.66	3.1/16 77.79
3½	2 50.80	5.3/8 136.53	3.7/8 98.43	3.9/16 90.49
4	2 50.80	6 152.40	4.3/4 120.65	4 101.60
5	2¼ 57.15	7.1/8 180.98	5.9/16 141.29	5.1/16 128.59
6	2.3/8 60.3	8½ 215.90	6.11/16 169.86	6.1/16 153.99
8	2.3/4 69.85	10.3/8 263.53	8.11/16 220.66	7.15/16 201.61
10	3.1/16 77.79	12.9/16 319.09	10.13/16 274.64	10 254.00
12	3.3/8 85.73	14.7/8 377.83	12.13/16 325.44	12 304.80
14	3½ 88.90	16.1/8 409.58	14.1/16 357.19	13¼ 336.55
16	3.11/16 93.66	18¼ 463.55	16.1/16 407.99	15¼ 387.35
18	4.1/16 103.19	20.3/4 527.05	18.5/8 473.08	17¼ 438.15
20	4.5/8 117.48	23.1/16 585.79	20.1/16 509.59	19¼ 488.95
24	5.3/8 136.53	27.7/8 708.03	25.1/8 638.18	23¼ 590.55
NPS	A	B	C	D

DIMENSIONS OF WELDOLET

CENTER OF RUN TO WELDOLET FACE

Distance between the run pipe center line and the weldolet top-bore:

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

WELDOLET SIZE ON SIZE AND WEIGHTS

SCHEDULE 40 WELDOLET

Outlet Size (NPS)	A	B	C	D	Weldolet weight in lbs
1/2	3/4	1 3/8	15/16	5/8	0.15
3/4	7/8	1 5/8	1  3/16	13/16	0.25
1	1  1/16	2	1  7/16	1  1/32	0.4
1 1/4	1 1/4	2 3/8	1 3/4	1 3/8	0.7
1 1/2	1  5/16	2 7/8	2	1 5/8	0.8
2	1 1/2	3 1/2	2  9/16	2  1/16	1.5
2 1/2	1 5/8	4 1/6	3	2  7/16	2.25
3	1 3/4	4 13/16	3 11/16	3  1/16	3.75
3 1/2	2	5 3/8	3 7/8	3  9/16	5
4	2	6	4 3/4	4	6.7
5	2 1/4	7 1/8	5  9/16	5  1/16	8.5
6	2 3/8	8 1/2	6 11/16	6  1/16	14
8	2 3/4	10 3/8	8 11/16	7 15/16	28
10	3  1/16	12  9/16	10 13/16	10	39
12	3 3/8	14 7/8	12 13/16	12	65
14	3 1/2	16 1/8	14  1/16	13 1/4	70
16	3 11/16	18 1/4	16  1/16	15 1/4	92
18	4  1/16	20 3/4	18 5/8	17 1/4	125
20	4 5/8	23  1/16	20  1/16	19 1/4	175
24	5 3/8	27 7/8	25 1/8	23 1/4	280
30	5 3/8	34  1/16	30  7/16	29 1/4	440
36	5 3/8	34  1/16	36 1/2	35 1/4	1180

SCHEDULE XS WELDOLET

Outlet Size (NPS)	A	B	C	D	Weldolet weight in lbs
1/23	3/4	1.375	15/16	5/8	0.15
3/4	7/8	1.625	1.1875	13/16	0.25
1	1.0625	2	1.4375	1.03125	0.4
1.25	1.25	2.4375	1.75	1.375	0.7
1.5	1.3125	2.875	2	1.625	0.9
2	1.5	3.5	2.5625	2.0625	1.6
2.5	1.625	4.0625	3	2.4375	2.5
3	1.75	4.8125	3.6875	3.0625	4.1
3.5	2	5.375	3.875	3.5625	5.1
4	2	6	4.75	4	7.5
5	2.25	7.125	5.5625	5.0625	9.5
6	3.0625	8.875	6.6875	6.0625	15
8	3.875	10.625	8.6875	7.625	32
10	3.5	12.875	10.4375	9.75	46
12	3.9375	15.1875	13	11.75	61
14	4.125	16.6875	14.3125	13	75
16	4.4375	18.875	16.5	15	115
18	4.6875	21.125	18.625	17	130
20	5	23.375	20.8125	19	187
24	5.5	27.875	25.125	23	316
26	5.75	30.125	27.25	25	370

WELDOLET / RUN PIPE: SIZES COMBINATIONS

Standard Weight Weldolet, Extra Strong Weldolet
Run Sizes	Outlet Size Inches
	1/8	1/4	3/8	1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6
	3/8	3/8	1/2	1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6
	1/2	1/2	1-3/4	3/4	1	1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6	8
	1-3/4	1-3/4	21/2-11/4	1	1 1/2 – 1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6	8	10
	2 1/2 – 1 1/4	21/2-11/4	36-3	1 1/2 – 1 1/4	2 1/2 – 2	2	2 1/2	3	4 – 3 1/2	4	5	6	8	10	14-12
	36-3	36-3	flat	2 1/2 – 2	5-3	2 1/2	3 1/2 – 3	4 – 3 1/2	5	5	6	8	10	12	16
	flat	flat		8-3	12-6	3 1/2 – 3	5-4	6-5	6	6	8	10	14-12	14	18
				36-10	36-14	5 – 4	8-6	12-8	10-8	8	10	14-12	20-16	18-16	22-20
				flat	flat	10 – 6	18-10	24-14	18-12	12-10	14-12	20-16	22	22-20	28-24
			3/4 – 1/2			36 – 12	36-20	36-26	36-20	18-14	20-16	36-24	36-24	28-24	36-30
			36 – 1			flat	flat	flat	flat	36-20	36-24	flat	flat	36-30	flat
			flat							flat	flat			flat
	Outlet sizes 8, 10, 12, 14, 16. 18, 24, 26. 20 order to specific size combination.							Size consolidation for Weldolets only

How to weld a weldolet?

Weldolet is a trade name, so you will not find the welding requirements in any of the ASME pressure piping codes. You need to look up the welding requirements under the heading of: Integrally reinforced branch fittings. 

Weldolets are specifically design to be welded and have the proper reliefs to ensure a proper weld, but the exact procedures for the welding will depend on 

1. The materials 
2. The exact configuration of the weld joints. 
3. The pressure and temperature ratings of the system 
4. Other specialized quality requirements that may exist. 

The best source of this information will be the supplier of the fittings in question. Below is a link to one such supplier, though I have no experience with them. 

Image from projectmaterials.com
In general, the fitting is welded with a CJP groove weld with a reinforcing fillet weld. The CJP groove weld is flush to the edge of the first bevel if there is a compound bevel. The size of the reinforcing fillet is dependent on the specific pressure piping code specified by the Owner. 
As far as the problem with the run pipe becoming oval and excessively distorted, the fewer weld passes to achieve the required weld size the better. Distortion is related to the number of weld beads. The more weld beads, the greater the distortion. You could try pre-cambering the run pipe before cutting the hole for the integrally reinforced branch fitting. 
The branch fitting should be hand contoured by grinding to ensure a uniform root opening all around the branch fitting before tacking it into position. Most of the fittings are sized by the manufacturer to fit a range of run pipe diameters if the contractor takes the time needed to properly contour the fitting before welding it to the run pipe. Some contractors do not take the step of properly hand fit the branch fitting and then they complain when they don’t achieve the required CJP groove weld. 
Several fitting manufacturers have websites that address the need to properly fit the fitting and how to weld them to meet code requirements.

Weldolets are specifically design to be welded and have the proper reliefs to ensure a proper weld, but the exact procedures for the welding will depend on 

1. The materials 
2. The exact configuration of the weld joints. 
3. The pressure and temperature ratings of the system 
4. Other specialized quality requirements that may exist. 

The best source of this information will be the supplier of the fittings in question. Below is a link to one such supplier, though I have no experience with them. 

How much weld metal is needed in a weldolet connection?

For example: 6.7 Welding of O-lets
The weld bevel of O-lets shall be completely filled up to weld line on the O-lets. Smooth transition between the pipe and the O-lets is required. Notches below the weld line shall be avoided. Prior to welding, sufficient root gap shall be ensured. 
end quote..
Ideally each combination of branch/header & OD/thk should have its own unique weldolet to provide sufficient (and sufficient only) reinforcement area.
The problem is that most weldolets (Bonney Forge and Yaang) are fabricated in groups covering several combinations of OD/thk for branch and header in order to reduce number of variants to fabricate and to have on stock. Consequently some of them (but only some of them) will have a thickness at the bevel which is way beyond the necessary branch reinforcement area. 

The options are then:

1. Fill out the bevel completely for the weldolet purchased
2. Buy a weldolet, specifically to the combination of OD/Thk of branch and header (remember to order it to be design approved) and fill it out completely (which will be less in many cases)
3. Do your own branch calculation for the weldolet actually purchased and fill bevel to calculated level. (Normally almost impossible because most suppliers won’t supply the full geometry) Accept also in this case the stress intensification applied.
4. In some cases, especially with thin walled SS piping it may be preferable to go back to the reinforcing pad solution, which is easier to calculate and requires less heat input.

Our opinion is – if you use a weldolet – fill it out or use another form of branch reinforcement.

Tees vs Weldolet in new piping system

My rule of thumb is when there is a standard size tee, use the tee.  If the branch from the header is smaller than any std tee available, use a weldolet.  I believe this is a better long term stress solution.

1. Size-to-Size – use a Tee
2. Size-to-One Size Reducing – use a Tee
3. Size-to-Two (or more) Size reducing – use a Weld-o-let

Besides a reducing tee and a weldolet, consider also a stub-in for low pressure applications or a stub-in with a reinforcing pad. This may be more economical for branches larger than 6″ or 8″.
While reducing tees are available down to the 1/2 the run diameter, I don’t see them used very often for more than a one size reduction.
If you’re driven by economics, consider the total installed cost and fitting availability. Other than the price of the fitting and materials, other costs include the cost of the welding, x-rays and heat treat. These costs and requirements will change with size and materials. For example, an 18″ WOL on a 36″ header is a big heavy chunk of metal that requires a lot of weld.

Weldolet Vs Sweepolet

Weldolets (aka WOL) are cheaper in terms of purchasing cost than sweepolets (aka SOL).
WOLs may, in some situations (large dia, thin wall) warp the pipe, i.e. unstraight and oval, due to excessive heat input arising form the relative thick required weld metal layer.
Since for WOLs the weld metal thickness is always greater than for SOLs (where one only welds the base metal wall thickness), welding may require some extra time to allow cooling off on the heat input to prevent banana-warping the pipe.
SOLs are less standard, I think most of the time custom made. Without having specific experience with SOLs, preparing and beveling the pipe for it may be more difficult/time-costuming compared to WOLs. For WOLs, you can weld them on, and then bore through the hole. This gives a smooth weld profile on the inside. This may give the best option for a flushing branch, as there is not weld metal ‘sticking into the run’ (provided the pipe doesnt become oval, as this will cause the pig trap to become stuck perhaps).
Since the saddle form is quite specific (but then again, the SOL may be laid down on the pipe, and the contour can be drawn), and a lot bigger than WOLs, more material has to be removed. 
If you use a SOL and the run pipe is large enough in dia, you may counter grind the root weld to become flush.
WOLs can be RT-ed, SOLs can.
WOLs are likely to give more peak stress than SOLs, since the latter has a much more continuous profile into the branch.

• 1) WOL are cheaper and more commonplace to fabricate and now the patent has expired, can be purchased from a number of different suppliers in many materials
• 2) If you have high loads, vibrations or other forces on the branch or a thin wall pipe and your fitting size is > 50% of the run pipe, sweepolets may help. Sweepolets are a custom fitting supplied by Bonney Forge and as they form part of the pipe need to be specifically manufactured to the same OD, wt and material grade as the pipe, hence are not available “off the shelf”.
• 3) Fabrication is realtively straight forward for both, operation identical
• 4) There is also a “weldoflange” made by yaang, up to 2″ branch size which combines a standard flange with a weldolet as a single forged item avoiding one or two small welds. You could also use a reducing tee, but I think this is quite unlikely for a pig trap.

How to install a Weldolet?

Source: youtube.com

Where to buy weldolet?

Yaang is a popular weldolet manufacturer, exporter and provider. Yaang leads the market in conveying a wide range of pipe fittings, for example, flanges, couplings, reducers, values, butt weld fitting, fashioned items, and so on. We stock all these piping products in standard sizes and materials for fast supply. Be that as it may, you can likewise get in touch with us needing any custom prerequisites.
Piping Products We Offer

• Reducing Weldolets
• Flat Weldolets
• Heavy Wall Weldolets
• Insert Weldolets
• Threadolets
• Sockolets
• SS Weldolets
• MSS SP 97 Weldolets

Yaang stock each and every type of Olet Fittings or branch fittings.

Source: China Weldolet Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

Please notice that you might be interested in the other technical articles we’ve published:

  • How to get high quality pipe olets

  • What are forged pipe fittings

  • How to get high quality Weldoflange or Nipoflange

  • Development trend of high pressure pipe fittings

  • WHAT ARE OUTLET PIPE FITTINGS

  • The difference between pipe nipple and pipe coupling

  • What is a Pipe Nipple

References:

• https://www.yaang.com