Flanges

Socket welding flange, a popular type of pipe flange, was initially developed for use on small-sized high- pressure piping. The fabrication of this type of flange is similar to that of a slip-on flange. However, the internal pocket of a socket weld flange allows for a smooth bore and better fluid flow. When provided with an internal weld, the static strength of this flange is equal to slip-on flange, but the fatigue strength is 50% greater than double welding slip-on flanges. Smooth bore conditions in such a flange can easily be attained without having to bevel the flange face and, after welding, to re-face the socket weld flange as would be required with slip-on flanges. For this reason, the internally welded flange is popular in chemical process piping. The counter bore is sightly larger than the Outer Diameter of the matching pipe, allowing the pipe to be inserted. A restriction is built into the bottom of the bore, which acts as a shoulder for the pipe to rest on, and has the same I.D. of matching pipe. The flow is not restricted in any direction.

Dimensions

Diameter : 1/2" à 24"

pressure class : 150# - 300# - 600# - 1500#

Schedules : SCH10S - SCH40S - SCH80S - SCH160

Variations

• Face finish : Raised face (RF) - Flat face (FF) - RTJ -
• Variations : Reducing Socket Weld

Standards

ASTM A182 - ASME SA182 - 'Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings'

ASME B16.5 - 'Pipe Flanges and Flanged Fittings'

MSS SP-6 - 'Standard Finishes for Contact Faces of Pipe Flanges and Connecting End Flanges of Valves and Fittings'

150 Lbs

							Drilling
Nominal Bore	Dia. (D)	Thick. (E)	Dia. (F)	Dia. (B)	Dia. (A)	Height1 (H)	Nbr	Holes	Dia. (C)
1/2"	90	11.2	35.05	30	22.2	14	4	15.87	60.3
3/4"	100	12.7	42.92	38	27.7	14	4	15.87	69.9
1"	110	14.3	50.80	49	34.5	16	4	15.87	79.4
1 1/4"	115	15.9	63.50	59	43.2	19	4	15.87	88.9
1 1/2"	125	17.5	73.15	65	49.5	21	4	15.87	98.4
2"	150	19.1	91.94	78	61.9	24	4	19.05	120.7
2 1/2"	180	22.3	104.65	90	74.6	27	4	19.05	139.7
3"	190	23.9	127.00	108	90.7	29	4	19.05	152.4

1,6mm raised face not included in the E & H dimensions
See below for the A2 dimension

The dimensions are in millimeters
Source : ASME B16.5 - 2007

300 Lbs

							Drilling
Nominal Bore	Dia. (D)	Thick. (E)	Dia. (F)	Dia. (B)	Dia. (A)	Height1 (H)	Nbr	Holes	Dia. (C)
1/2"	95	12.7	35.05	38	22.2	21	4	15.87	66.7
3/4"	115	14.3	42.92	48	27.7	24	4	19.05	82.6
1"	125	15.9	50.80	54	34.5	25	4	19.05	88.9
1 1/4"	135	17.5	63.50	64	43.2	25	4	19.05	98.4
1 1/2"	155	19.1	73.15	70	49.5	29	4	22.22	114.3
2"	165	20.7	91.94	84	61.9	32	8	19.05	127.0
2 1/2"	190	23.9	104.65	100	74.6	37	8	22.22	149.2
3"	210	27.0	127.00	117	90.7	41	8	22.22	168.3

 

1,6mm raised face not included in the E & H dimensions
See below for the A2 dimension

The dimensions are in millimeters
Source : ASME B16.5 - 2007

600 Lbs

							Drilling
Nominal Bore	>Dia. (D)	Thick. (E)	Dia. (F)	Dia. (B)	Dia. (A)	Height1 (H)	Nbr	Holes	Dia. (C)
1/2"	95	14.3	35.05	38	22.2	22	4	15.87	66.7
3/4"	115	15.9	42.92	48	27.7	25	4	19.05	82.6
1"	125	17.5	50.80	54	34.5	27	4	19.05	88.9
1 1/4"	135	20.7	63.50	64	43.2	29	4	19.05	98.4
1 1/2"	155	22.3	73.15	70	49.5	32	4	22.22	114.3
2"	165	25.4	91.94	84	61.9	37	8	19.05	127.0
2 1/2"	190	28.6	104.65	100	74.6	41	8	22.22	149.2
3"	210	31.8	127.00	117	90.7	46	8	22.22	168.3

6,4mm raised face not included in the E & H dimensions
See below for the A2 dimension

The dimensions are in millimeters
Source : ASME B16.5 - 2007

InNER diameter depending on thicknesses - A2

Nominal Bore	SCH10S	SCH40S	SCH80S	SCH160
1/2"	17.1	15.8	13.9	11.8
3/4"	22.4	20.9	18.8	15.6
1"	27.8	26.6	24.3	20.7
1 1/4"	36.6	35.1	32.5	29.5
1 1/2"	42.7	40.9	38.1	34
2"	54.7	52.5	49.2	42.9
2 1/2"	66.9	62.7	59	54
3"	82.8	77.9	73.7	66.7

The dimensions are in millimeters
Source : ASME B16.5 - 2007