Orifice Fittings

Sweco Fab, Inc. manufactures different kinds of high quality Orifice Plates and Flanges. They can be manufactured in SS304, SS316, and all other grades of S.S., C.S. Brass, Monel 400, Alloy 20, Inconel 600, 625 and 718, Nickel 200, Hastelloy C276 & B-2, Titanium Gr.2 and Zirc. 702.

Product Information
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1. Orifice plate, typically with a concentric bore, restricts the flow, thus allowing one to determine or calculate the volumetric or mass flow rate.

2. Sweco Fab has been supplying these orifice plates (with concentric, eccentric or segmental bore) in Stainless Steel or other alloy material. Orifice flanges, complete with bolts, nuts, jack screws, and gaskets can be supplied upon customer request.

3. Bore Calculations are available upon request with additional cost.

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Orifice Flange Unions

SWECO® Orifice Flange Unions consist of two facing flanges sandwiching a paddle or skillet type orifice plate with flange bolts. Both flanges are equipped with precisely located pressure taps which allow measurement of the pressure drop created by the orifice plate. The precise location of the pressure taps in conjunction with the precisely machined orifice hole allow the pressure drop to be converted to a flow value.
Orifice Flange Unions may be provided as any one of welding neck, slip-on or threaded flanges. Either flat gasket or ring-type gasket designed flange unions are possible.
SWECO® Fab Flange Unions are a complete set (as shown) consisting of two flanges, an orifice plate, gaskets, nuts, bolts, and jacking screws.

SWECO® Fab Flange Unions can be made to ASME B16.36, AGA, ISA or your own tolerances and specifications.

Paddle Type Orifice Plate Installation

SWECO® Paddle Style Orifice Plates (OP) are designed to fit between two specially modified flanges inside what is called an Orifice Flange Union (OFU). Orifice plates within OFUs are designed to create a restriction which causes the pressure of the fluid flowing through the pipe to drop. The drop in pressure varies directly with the flow of the fluid within the system.
Virtually any bore shape or configuration can be used to measure flow in a pipe, but the most common is a concentric (center) bore with a round hole having square, conical, or quadrant (radius) bore wall. No matter what the type of bore, the square edge goes upstream as shown in the diagram below.

The OFU will consist of the following parts:

1. Two special flanges facing each other (modified with jacking screws and ports).
2. Two gaskets
3. Studs and bolts
4. Your SWECO® Orifice Plate
5. Additionally, some OFUs have dowel pins to improve accuracy of alignment.

It is common for the OFU to have flanges with a material consistent with the pipeline and an Orifice Plate of stainless steel.
To install a new orifice plate in an existing installation refer to the exploded diagram on the next page and follow these steps:

Safety:
You should ensure that all flow to the OFU is blocked and locked out according to company policy. Wear proper Safety Gear.

Class 300 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(3) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(4) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face R	Outside Dia. of Flange O	Min. Thk. of Flange Tf	Length Through Hub Y1	Diameter of Hub X	Hub Dia. Beginning of Chamfer A	Bore B1	Dia. Of Pressure Connection TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Machine Bolt Length	Stud Bolt Length
1	2.00	4.88	1.44	3.19	2.12	1.32	Note 4	1/4	3.50	4	11/16	5/8	4.50	5.00
1 1/2	2.88	6.12	1.44	3.31	2.75	1.90	Note 4	1/4	4.50	4	13/16	3/4	4.75	5.25
2	3.62	6.50	1.44	3.31	3.31	2.38	Note 4	1/4	5.00	8	11/16	5/8	4.50	5.00
2 1/2	4.12	7.50	1.44	3.44	3.94	2.88	Note 4	1/4	5.88	8	13/16	3/4	4.75	5.25
3	5.00	8.25	1.44	3.44	4.62	3.50	Note 4	3/8	6.62	8	13/16	3/4	4.75	5.25
4	6.19	10.00	1.44	3.56	5.75	4.50	Note 4	1/2	7.88	8	13/16	3/4	4.75	5.25
6	8.50	12.50	1.44	3.88	8.12	6.63	Note 4	1/2	10.62	12	7/8	3/4	4.75	5.25
8	10.62	15.00	1.56	4.31	10.25	8.63	Note 4	1/2	13.00	12	1	7/8	5.00	5.75
10	12.75	17.50	1.81	4.56	12.62	10.75	Note 4	1/2	15.25	16	1 1/8	1	5.75	6.50
12	15.00	20.50	1.94	5.06	14.75	12.75	Note 4	1/2	17.75	16	1 1/4	1 1/8	6.25	7.00
14	16.25	23.00	2.06	5.56	16.75	14.00	Note 4	1/2	20.25	20	1 1/4	1 1/8	6.50	7.25
16	18.50	25.50	2.19	5.69	19.00	16.00	Note 4	1/2	22.50	20	1 3/8	1 1/4	7.00	7.75
18	21.00	28.00	2.31	6.19	21.00	18.00	Note 4	1/2	24.75	24	1 3/8	1 1/4	7.25	8.00
20	23.00	30.50	2.44	6.31	23.12	20.00	Note 4	1/2	27.00	24	1 3/8	1 1/4	7.50	8.50
24	27.25	36.00	2.69	6.56	27.62	24.00	Note 4	1/2	32.00	24	1 3/8	1 1/2	8.25	9.50

Class 400 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flange in NPS 24 will require an angular meter tap as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 4 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-type
joint flanges include allowance of 0.62 in. for NPS 4 to NPS 10, 0.75 in. for NPS 12 to NPS 18, and 0.88 in. for NPS 20.
(4) Bore is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Bore	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y1	X	A	B1	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	For NPS 3 and Smaller use Class 600.
1 1/2
2
2 1/2
3
4	6.19	10.00	1.50	3.50	5.75	4.50	Note 4	1/2	7.88	8	1.00	7/8	6.00
6	8.50	12.50	1.62	4.06	8.12	6.63	Note 4	1/2	10.62	12	1.00	7/8	6.50
8	10.62	15.00	1.88	4.62	10.25	8.63	Note 4	1/2	13.00	12	1.12	1	7.25
10	12.75	17.50	2.12	4.88	12.62	10.75	Note 4	1/2	15.25	16	1.25	1 1/8	8.00
12	15.00	20.50	2.25	5.38	14.75	12.75	Note 4	1/2	17.75	16	1.38	1 1/4	8.50
14	16.25	23.00	2.39	5.88	16.75	14.00	Note 4	1/2	20.25	20	1.38	1 1/4	9.00
16	18.50	25.50	2.50	6.00	19.00	16.00	Note 4	1/2	22.50	20	1.50	1 3/8	9.25
18	21.00	28.00	2.62	6.50	21.00	18.00	Note 4	1/2	24.75	24	1.50	1 3/8	9.50
20	23.00	30.50	2.75	6.62	23.12	20.00	Note 4	1/2	27.00	24	1.62	1 1/2	10.25
24	27.25	36.00	3.00	6.88	27.62	24.00	Note 4	1/2	32.00	24	1.88	1 3/4	11.50

Class 600 – RAISED FACE WELD NECK ORIFICE FLANGES

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Bore	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y1	X	A	B1	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	2.00	4.88	1.44	3.19	2.12	1.32	Note 4	1/4	3.50	4	0.69	5/8	5.00
1 1/2	2.88	6.12	1.44	3.32	2.75	1.90	Note 4	1/4	4.50	4	0.81	3/4	5.25
2	3.62	6.50	1.44	3.32	3.31	2.38	Note 4	1/4	5.00	8	0.69	5/8	5.00
2 1/2	4.12	7.50	1.44	3.44	3.94	2.88	Note 4	1/4	5.88	8	0.81	3/4	5.25
3	5.00	8.25	1.44	3.44	4.62	3.50	Note 4	3/8	6.62	8	0.81	3/4	5.25
4	6.19	10.75	1.50	4.00	6.00	4.50	Note 4	1/2	8.50	8	1.00	7/8	6.50
6	8.50	14.00	1.88	4.62	8.75	6.63	Note 4	1/2	11.50	12	1.12	1	7.50
8	10.62	16.50	2.19	5.25	10.75	8.63	Note 4	1/2	13.75	12	1.25	1 1/8	8.25
10	12.75	20.00	2.50	6.00	13.50	10.75	Note 4	1/2	17.00	16	1.38	1 1/4	9.25
12	15.00	22.00	2.62	6.12	15.75	12.75	Note 4	1/2	19.25	20	1.38	1 1/4	9.50
14	16.25	23.75	2.75	6.50	17.00	14.00	Note 4	1/2	20.75	20	1.50	1 3/8	10.00
16	18.50	27.00	3.00	7.00	19.50	16.00	Note 4	1/2	23.75	20	1.62	1 1/2	10.75
18	21.00	29.25	3.25	7.25	21.50	18.00	Note 4	1/2	25.75	20	1.75	1 5/8	11.50
20	23.00	32.00	3.50	7.50	24.00	20.00	Note 4	1/2	28.50	24	1.75	1 5/8	12.50
24	27.25	37.00	4.00	8.00	28.25	24.00	Note 4	1/2	33.00	24	2.00	1 7/8	13.75

Class 900 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 12 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 3 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-type
joint flanges include allowance of 0.62 in. for NPS 3 to NPS 10 and 0.75 in. for NPS 12.
(4) Bore is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Bore B1	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y1	X	A	B1	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	For NPS 2 1/2 and smaller, use Class 1500
1 1/2
2
2 1/2
3	5.00	9.50	1.50	4.00	5.00	3.50	Note 4	3/8	7.50	8	1.00	7/8	6.00
4	6.19	11.50	1.75	4.50	6.25	4.50	Note 4	1/2	9.25	8	1.25	1 1/8	7.00
6	8.50	15.00	2.19	5.50	9.25	6.63	Note 4	1/2	12.50	12	1.25	1 1/8	7.75
8	10.62	18.50	2.50	6.38	11.75	8.63	Note 4	1/2	15.50	12	1.50	1 3/8	9.00
10	12.75	21.50	2.75	7.25	14.50	10.75	Note 4	1/2	18.50	16	1.50	1 3/8	9.50
12	15.00	24.00	3.12	7.88	16.50	12.75	Note 4	1/2	21.00	20	1.50	1 3/8	10.25
14	16.25	25.25	3.38	8.38	17.75	14.00	Note 4	1/2	22.00	20	1.62	1 1/2	11.00
16	18.50	27.75	3.50	8.50	20.00	16.00	Note 4	1/2	24.25	20	1.75	1 5/8	11.50
18	21.00	31.00	4.00	9.00	22.25	18.00	Note 4	1/2	27.00	20	2.00	1 7/8	13.00
20	23.00	33.75	4.25	9.75	24.50	20.00	Note 4	1/2	29.50	24	2.12	2	14.00
24	27.25	41.00	5.50	11.50	29.50	24.00	Note 4	1/2	35.50	24	2.62	2 1/2	17.50

Class 1500 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 6 will require angular meter taps shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24. Bolt
lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 1 to NPS 6.
(4) Bore is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Bore	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y1	X	A	B1	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	2.00	5.88	1.50	3.25	2.06	1.32	Note 4	1/4	4.00	4	1.00	7/8	6.00
1 1/2	2.88	7.00	1.50	3.50	2.75	1.90	Note 4	1/4	4.88	4	1.12	1	6.25
2	3.62	8.50	1.50	4.00	4.12	2.38	Note 4	1/4	6.50	8	1.00	7/8	6.00
2 1/2	4.12	9.62	1.62	4.12	4.88	2.38	Note 4	1/4	7.50	8	1.12	1	6.50
3	5.00	10.50	1.88	4.62	5.25	3.50	Note 4	3/8	8.00	8	1.25	1 1/8	7.25
4	6.19	12.25	2.12	4.88	6.38	4.50	Note 4	1/2	9.50	8	1.38	1 1/4	8.00
6	8.50	15.50	3.25	6.75	9.00	6.63	Note 4	1/2	12.50	12	1.50	1 3/8	10.50
8	10.62	19.00	3.62	8.38	11.50	8.63	Note 4	1/2	15.50	12	1.75	1 5/8	11.75
10	12.75	23.00	4.25	10.00	14.50	10.75	Note 4	1/2	19.00	12	2.00	1 7/8	13.50
12	15.00	26.50	4.88	11.12	17.75	12.75	Note 4	1/2	22.50	16	2.12	2	15.00
14	16.25	29.50	5.25	11.75	19.50	14.00	Note 4	1/2	25.00	16	2.38	2 1/4	16.25
16	18.50	32.50	5.75	12.25	21.75	16.00	Note 4	1/2	27.75	16	2.62	2 1/2	17.75
18	21.00	36.00	6.38	12.88	23.50	18.00	Note 4	1/2	30.50	16	2.88	2 3/4	19.75
20	23.00	38.75	7.00	14.00	25.25	20.00	Note 4	1/2	32.75	16	3.12	3	21.50
24	27.25	46.00	8.00	16.00	30.00	24.00	Note 4	1/2	39.00	16	3.62	3 1/2	24.50

Class 2500 – RAISED FACE WELD NECK ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 3 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include allowance
of 15 mm (0.62 in.) for NPS 1 to NPS 3.
(4) Bore is to be specified by the purchaser.

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Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Bore	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
	R	O	Tf	Y	X	A	B1	TT
1	2.00	6.25	1.50	3.62	2.25	1.32	Note 4	1/4	4.25	4	1.00	7/8	6.00
1 1/2	2.88	8.00	1.75	4.38	3.12	1.90	Note 4	1/4	5.75	4	1.25	1 1/8	7.00
2	3.62	9.25	2.00	5.00	3.75	2.38	Note 4	1/4	6.75	8	1.12	1	7.25
2 1/2	4.12	10.50	2.25	5.62	4.50	2.38	Note 4	1/4	7.75	8	1.25	1 1/8	8.00
3	5.00	12.00	2.62	6.62	5.25	3.50	Note 4	3/8	9.00	8	1.38	1 1/4	9.00
4	6.19	14.00	3.00	7.50	6.50	4.50	Note 4	1/2	10.75	8	1.62	1 1/2	10.25
6	8.50	19.00	4.25	10.75	9.25	6.63	Note 4	1/2	14.50	8	2.12	2	13.75
8	10.62	21.75	5.00	12.50	12.00	8.63	Note 4	1/2	17.25	12	2.12	2	15.25
10	12.75	26.50	6.50	16.50	14.75	10.75	Note 4	1/2	21.25	12	2.62	2 1/2	19.25

Showing 1 to 10 of 11 entries

Class 300

Class 300 – RAISED FACE SLIP-ON ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) For slip-on flanges, verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(5) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face R	Outside Dia. of Flange O	Min. Thk. of Flange Tf	Length Through Hub Y1	Diameter of Hub X	Hub Dia. Beginning of Chamfer A	Bore B1	Dia. Of Pressure Connection TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Machine Bolt Length	Stud Bolt Length
1	2.00	4.88	1.44	3.19	2.12	1.32	Note 4	1/4	3.50	4	11/16	5/8	4.50	5.00
1 1/2	2.88	6.12	1.44	3.31	2.75	1.90	Note 4	1/4	4.50	4	13/16	3/4	4.75	5.25
2	3.62	6.50	1.44	3.31	3.31	2.38	Note 4	1/4	5.00	8	11/16	5/8	4.50	5.00
2 1/2	4.12	7.50	1.44	3.44	3.94	2.88	Note 4	1/4	5.88	8	13/16	3/4	4.75	5.25
3	5.00	8.25	1.44	3.44	4.62	3.50	Note 4	3/8	6.62	8	13/16	3/4	4.75	5.25
4	6.19	10.00	1.44	3.56	5.75	4.50	Note 4	1/2	7.88	8	13/16	3/4	4.75	5.25
6	8.50	12.50	1.44	3.88	8.12	6.63	Note 4	1/2	10.62	12	7/8	3/4	4.75	5.25
8	10.62	15.00	1.56	4.31	10.25	8.63	Note 4	1/2	13.00	12	1	7/8	5.00	5.75
10	12.75	17.50	1.81	4.56	12.62	10.75	Note 4	1/2	15.25	16	1 1/8	1	5.75	6.50
12	15.00	20.50	1.94	5.06	14.75	12.75	Note 4	1/2	17.75	16	1 1/4	1 1/8	6.25	7.00
14	16.25	23.00	2.06	5.56	16.75	14.00	Note 4	1/2	20.25	20	1 1/4	1 1/8	6.50	7.25
16	18.50	25.50	2.19	5.69	19.00	16.00	Note 4	1/2	22.50	20	1 3/8	1 1/4	7.00	7.75
18	21.00	28.00	2.31	6.19	21.00	18.00	Note 4	1/2	24.75	24	1 3/8	1 1/4	7.25	8.00
20	23.00	30.50	2.44	6.31	23.12	20.00	Note 4	1/2	27.00	24	1 3/8	1 1/4	7.50	8.50
24	27.25	36.00	2.69	6.56	27.62	24.00	Note 4	1/2	32.00	24	1 3/8	1 1/2	8.25	9.50

Class 300 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) For slip-on and threaded flanges, verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(5) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face R	Outside Dia. of Flange O	Min. Thk. of Flange Tf	Length Through Hub Y1	Diameter of Hub X	Hub Dia. Beginning of Chamfer A	Bore B1	Dia. Of Pressure Connection TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Machine Bolt Length	Stud Bolt Length
1	2.00	4.88	1.44	3.19	2.12	1.32	Note 4	1/4	3.50	4	11/16	5/8	4.50	5.00
1 1/2	2.88	6.12	1.44	3.31	2.75	1.90	Note 4	1/4	4.50	4	13/16	3/4	4.75	5.25
2	3.62	6.50	1.44	3.31	3.31	2.38	Note 4	1/4	5.00	8	11/16	5/8	4.50	5.00
2 1/2	4.12	7.50	1.44	3.44	3.94	2.88	Note 4	1/4	5.88	8	13/16	3/4	4.75	5.25
3	5.00	8.25	1.44	3.44	4.62	3.50	Note 4	3/8	6.62	8	13/16	3/4	4.75	5.25
4	6.19	10.00	1.44	3.56	5.75	4.50	Note 4	1/2	7.88	8	13/16	3/4	4.75	5.25
6	8.50	12.50	1.44	3.88	8.12	6.63	Note 4	1/2	10.62	12	7/8	3/4	4.75	5.25
8	10.62	15.00	1.56	4.31	10.25	8.63	Note 4	1/2	13.00	12	1	7/8	5.00	5.75
10	12.75	17.50	1.81	4.56	12.62	10.75	Note 4	1/2	15.25	16	1 1/8	1	5.75	6.50
12	15.00	20.50	1.94	5.06	14.75	12.75	Note 4	1/2	17.75	16	1 1/4	1 1/8	6.25	7.00
14	16.25	23.00	2.06	5.56	16.75	14.00	Note 4	1/2	20.25	20	1 1/4	1 1/8	6.50	7.25
16	18.50	25.50	2.19	5.69	19.00	16.00	Note 4	1/2	22.50	20	1 3/8	1 1/4	7.00	7.75
18	21.00	28.00	2.31	6.19	21.00	18.00	Note 4	1/2	24.75	24	1 3/8	1 1/4	7.25	8.00
20	23.00	30.50	2.44	6.31	23.12	20.00	Note 4	1/2	27.00	24	1 3/8	1 1/4	7.50	8.50
24	27.25	36.00	2.69	6.56	27.62	24.00	Note 4	1/2	32.00	24	1 3/8	1 1/2	8.25	9.50

Class 400 – RING JOINT ORIFICE FLANGES

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Groove No.	Pitch Dia. P	Dia. Of Pressure Connection TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y	X	A	R Ring	P	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	For NPS 3 and Smaller use Class 600.
1 1/2
2
2 1/2
3
4	6.19	10.00	1.50	3.50	5.75	4.50	R37	5.875	1/2	7.88	8	1.00	7/8	6
6	8.50	12.50	1.62	4.06	8.12	6.63	R45	8.313	1/2	10.62	12	1.00	7/8	6.5
8	10.62	15.00	1.88	4.62	10.25	8.63	R49	10.625	1/2	13.00	12	1.12	1	7.25
10	12.75	17.50	2.12	4.88	12.62	10.75	R53	12.750	1/2	15.25	16	1.25	1 1/8	8
12	15.00	20.50	2.25	5.38	14.75	12.75	R57	15.000	1/2	17.75	16	1.38	1 1/4	8.5
14	16.25	23.00	2.39	5.88	16.75	14.00	R61	16.500	1/2	20.25	20	1.38	1 1/4	9
16	18.50	25.50	2.50	6.00	19.00	16.00	R65	18.500	1/2	22.50	20	1.50	1 3/8	9.25
18	21.00	28.00	2.62	6.50	21.00	18.00	R69	21.000	1/2	24.75	24	1.50	1 3/8	9.5
20	23.00	30.50	2.75	6.62	23.12	20.00	R73	23.000	1/2	27.00	24	1.62	1 1/2	10.25
24	27.25	36.00	3.00	6.88	27.62	24.00	R77	27.250	1/2	32.00	24	1.88	1 3/4	11.5

Class 600 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in inches.
(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.
(c) All other dimensions are in accordance with ASME B16.5.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) For slip-on and threaded flanges, verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.
(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(5) Bore diameter of weld neck flanges is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Groove No.	Pitch Dia.	Dia. Of Pressure Connection TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y1	X	A	R Ring	P	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	2.00	4.88	1.44	3.19	2.12	1.32	R16	2.000	1/4	3.50	4	0.75	5/8	5.50
1 1/2	2.88	6.12	1.44	3.32	2.75	1.90	R20	2.688	1/4	4.50	4	0.88	3/4	5.50
2	3.62	6.50	1.44	3.32	3.31	2.38	R23	3.250	1/4	5.00	8	0.75	5/8	5.50
2 1/2	4.12	7.50	1.44	3.44	3.94	2.88	R26	4.000	1/4	5.88	8	0.88	3/4	5.75
3	5.00	8.25	1.44	3.44	4.62	3.50	R31	4.875	3/8	6.62	8	0.88	3/4	5.75
4	6.19	10.75	1.50	4.00	6.00	4.50	R37	5.875	1/2	8.50	8	1.00	7/8	6.50
6	8.50	14.00	1.88	4.62	8.75	6.63	R45	8.313	1/2	11.50	12	1.12	1	7.50
8	10.62	16.50	2.19	5.25	10.75	8.63	R49	10.625	1/2	13.75	12	1.25	1 1/8	8.25
10	12.75	20.00	2.50	6.00	13.50	10.75	R53	12.750	1/2	17.00	16	1.38	1 1/4	9.25
12	15.00	22.00	2.62	6.12	15.75	12.75	R57	15.000	1/2	19.25	20	1.38	1 1/4	9.50
14	16.25	23.75	2.75	6.50	17.00	14.00	R61	16.500	1/2	20.75	20	1.50	1 3/8	10.00
16	18.50	27.00	3.00	7.00	19.50	16.00	R65	18.500	1/2	23.75	20	1.62	1 1/2	10.75
18	21.00	29.25	3.25	7.25	21.50	18.00	R69	21.000	1/2	25.75	20	1.75	1 5/8	11.50
20	23.00	32.00	3.50	7.50	24.00	20.00	R73	23.000	1/2	28.50	24	1.75	1 5/8	12.50
24	27.25	37.00	4.00	8.00	28.25	24.00	R77	27.250	1/2	33.00	24	2.00	1 7/8	13.75

Class 900 – RING JOINT ORIFICE FLANGES

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Groove No.	Pitch Dia.	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y1	X	A	R Ring	P	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	For NPS 2 1/2 and smaller, use Class 1500
1 1/2
2
2 1/2
3	5.00	9.50	1.50	4.00	5.00	3.50	R31	4.875	3/8	7.50	8	1.00	7/8	6
4	6.19	11.50	1.75	4.50	6.25	4.50	R37	5.875	1/2	9.25	8	1.25	1 1/8	7
6	8.50	15.00	2.19	5.50	9.25	6.63	R45	8.313	1/2	12.50	12	1.25	1 1/8	7.75
8	10.62	18.50	2.50	6.38	11.75	8.63	R49	10.625	1/2	15.50	12	1.50	1 3/8	9
10	12.75	21.50	2.75	7.25	14.50	10.75	R53	12.750	1/2	18.50	16	1.50	1 3/8	9.5
12	15.00	24.00	3.12	7.88	16.50	12.75	R57	15.000	1/2	21.00	20	1.50	1 3/8	10.25
14	16.25	25.25	3.38	8.38	17.75	14.00	R62	16.500	1/2	22.00	20	1.62	1 1/2	11
16	18.50	27.75	3.50	8.50	20.00	16.00	R66	18.500	1/2	24.25	20	1.75	1 5/8	11.5
18	21.00	31.00	4.00	9.00	22.25	18.00	R70	21.000	1/2	27.00	20	2.00	1 7/8	13
20	23.00	33.75	4.25	9.75	24.50	20.00	R74	23.000	1/2	29.50	24	2.12	2	14
24	27.25	41.00	5.50	11.50	29.50	24.00	R78	27.250	1/2	35.50	24	2.62	2 1/2	17.5

Class 1500 – RING JOINT ORIFICE FLANGES

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Groove No.	Pitch Dia.	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y	X	A	R Ring	P	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	2.00	5.88	1.50	3.25	2.06	1.32	R16	2.000	1/4	4.00	4	1.00	7/8	6.00
1 1/2	2.88	7.00	1.50	3.50	2.75	1.90	R20	2.688	1/4	4.88	4	1.12	1	6.25
2	3.62	8.50	1.50	4.00	4.12	2.38	R24	3.750	1/4	6.50	8	1.00	7/8	6.00
2 1/2	4.12	9.62	1.62	4.12	4.88	2.38	R27	4.250	1/4	7.50	8	1.12	1	6.50
3	5.00	10.50	1.88	4.62	5.25	3.50	R35	5.375	3/8	8.00	8	1.25	1 1/8	7.25
4	6.19	12.25	2.12	4.88	6.38	4.50	R39	6.375	1/2	9.50	8	1.38	1 1/4	8.00
6	8.50	15.50	3.25	6.75	9.00	6.63	R46	8.312	1/2	12.50	12	1.50	1 3/8	10.50
8	10.62	19.00	3.62	8.38	11.50	8.63	R50	10.625	1/2	15.50	12	1.75	1 5/8	11.75
10	12.75	23.00	4.25	10.00	14.50	10.75	R54	12.750	1/2	19.00	12	2.00	1 7/8	13.50
12	15.00	26.50	4.88	11.12	17.75	12.75	R58	15.000	1/2	22.50	16	2.12	2	15.00
14	16.25	29.50	5.25	11.75	19.50	14.00	R63	16.500	1/2	25.00	16	2.38	2 1/4	16.25
16	18.50	32.50	5.75	12.25	21.75	16.00	R67	18.500	1/2	27.75	16	2.62	2 1/2	17.75
18	21.00	36.00	6.38	12.88	23.50	18.00	R71	21.000	1/2	30.50	16	2.88	2 3/4	19.75
20	23.00	38.75	7.00	14.00	25.25	20.00	R75	23.000	1/2	32.75	16	3.12	3	21.50
24	27.25	46.00	8.00	16.00	30.00	24.00	R79	27.250	1/2	39.00	16	3.62	3 1/2	24.50

Class 2500 – RING JOINT ORIFICE FLANGES

GENERAL NOTES:
(a) Dimensions are in millimeters, except for bolts and bolt holes.
(b) All other dimensions are in accordance with ASME B16.5.
(c) Ring joint flanges larger than NPS 3 will require angular meter taps as shown in Fig. 2.
NOTES:
(1) Other NPT sizes may be furnished if required.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include allowance
of 15 mm (0.62 in.) for NPS 1 to NPS 3.
(4) Bore is to be specified by the purchaser.

Nominal pipe size	Outside Dia. of Raised Face	Outside Dia. of Flange	Min. Thk. of Flange	Length Through Hub	Diameter of Hub	Hub Dia. Beginning of Chamfer	Groove No.	Pitch Dia.	Dia. Of Pressure Connection	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
Nominal pipe size	R	O	Tf	Y	X	A	R Ring	P	TT	Bolt Circle	Number of Holes	Dia. of Holes	Dia. of Bolts	Stud Bolt Length
1	2.00	6.25	1.50	3.62	2.25	1.32	R18	2.375	1/4	4.25	4	1.00	7/8	6.00
1 1/2	2.88	8.00	1.75	4.38	3.12	1.90	R23	3.250	1/4	5.75	4	1.25	1 1/8	7.00
2	3.62	9.25	2.00	5.00	3.75	2.38	R26	4.000	1/4	6.75	8	1.12	1	7.25
2 1/2	4.12	10.50	2.25	5.62	4.50	2.38	R28	4.375	1/4	7.75	8	1.25	1 1/8	8.00
3	5.00	12.00	2.62	6.62	5.25	3.50	R32	5.000	3/8	9.00	8	1.38	1 1/4	9.00
4	6.19	14.00	3.00	7.50	6.50	4.50	R38	6.188	1/2	10.75	8	1.62	1 1/2	10.25
6	8.50	19.00	4.25	10.75	9.25	6.63	R47	9.000	1/2	14.50	8	2.12	2	13.75
8	10.62	21.75	5.00	12.50	12.00	8.63	R51	11.000	1/2	17.25	12	2.12	2	15.25
10	12.75	26.50	6.50	16.50	14.75	10.75	R55	13.500	1/2	21.25	12	2.62	2 1/2	19.25
12	15.00	30.00	7.25	18.25	17.38	12.75	R60	16.000	1/2	24.38	12	2.88	2 3/4	21.25

Class 300 – RTJ Restriction Orifice Plates

LINE SIZE	RING SIZE	A	B
1/2"	R-11	29/32"	4 1/4"
3/4"	R-13	1"	4 1/4"
1"	R-16	1"	4 1/4"
1 1/2"	R-20	1"	4 1/4"
2"	R-23	1 1/16"	4 1/4"
2 1/2"	R-26	1 1/16"	4 1/4"
3"	R-31	1 1/16"	4 1/4"
3 1/2"	R-34	1 1/16"	4 1/4"
4"	R-37	1 1/16"	4 1/4"
5"	R-41	1 1/16"	4 1/4"
6"	R-45	1 1/16"	4 1/4"
8"	R-49	1 1/16"	4 1/4"
10"	R-53	1 3/16"	7 1/2"
12"	R-57	1 3/16"	7 1/2"
14"	R-61	1 3/16"	7 1/2"
16"	R-65	1 3/16"	7 1/2"
18"	R-69	1 3/16"	7 1/2"
20"	R-73	1 1/4"	7 1/2"
24"	R-77	1 7/16"	7 1/2"

Class 600 – RTJ Restriction Orifice Plates

LINE SIZE	RING SIZE	A	B
1/2"	R-11	29/32"	4 1/4"
3/4"	R-13	1"	4 1/4"
1"	R-16	1"	4 1/4"
1 1/2"	R-20	1"	4 1/4"
2"	R-23	1 1/16"	4 1/4"
2 1/2"	R-26	1 1/16"	4 1/4"
3"	R-31	1 1/16"	4 1/4"
3 1/2"	R-34	1 1/16"	4 1/4"
4"	R-37	1 1/16"	4 1/4"
5"	R-41	1 1/16"	4 1/4"
6"	R-45	1 1/16"	4 1/4"
8"	R-49	1 1/16"	4 1/4"
10"	R-53	1 3/16"	7 1/2"
12"	R-57	1 3/16"	7 1/2"
14"	R-61	1 3/16"	7 1/2"
16"	R-65	1 3/16"	7 1/2"
18"	R-69	1 3/16"	7 1/2"
20"	R-73	1 1/4"	7 1/2"
24"	R-77	1 7/16"	7 1/2"

Class 900 – RTJ Restriction Orifice Plates

LINE SIZE	RING SIZE	A	B
1/2"	R-12	1"	4 1/4"
3/4"	R-14	1"	4 1/4"
1"	R-16	1"	4 1/4"
1 1/2"	R-20	1"	4 1/4"
2"	R-24	1 1/16"	5 1/4"
2 1/2"	R-27	1 1/16"	5 1/4"
3"	R-31	1 1/16"	5 1/4"
3 1/2"	-	1 1/16"	5 1/4"
4"	R-37	1 1/16"	5 1/4"
5	R-41	1 1/16"	6 1/4"
6"	R-45	1 1/16"	6 1/4"
8"	R-49	1 1/16"	6 1/2"
10"	R-53	1 3/16"	7 1/2"
12"	R-57	1 3/16"	7 1/2"
14"	R-62	1 7/16	7 1/2"
16"	R-66	1 7/16	7 1/2"
18"	R-70	1 9/16"	7 1/2"
20"	R-74	1 9/16"	7 1/2"
24"	R-78	1 7/8"	9 1/2"

Class 1500 – RTJ Restriction Orifice Plates

LINE SIZE	RING SIZE	A	B
1/2"	R-12	1"	6 1/2"
3/4"	R-14	1"	6 1/2"
1"	R-16	1"	6 1/2"
1 1/2"	R-20	1"	6 1/2"
2"	R-24	1 11/16"	6 1/2"
2 1/2"	R-27	1 11/16"	6 1/2"
3"	R-35	1 11/16"	6 1/2"
4"	R-39	1 11/16"	6 1/2"
5"	R-44	1 11/16"	6 1/2"
6"	R-46	1 3/16"	6 1/2"
8"	R-50	1 5/16"	6 1/2"
10"	R-54	1 7/16"	7 1/2"
12"	R-58	1 11/16	8 1/2"
14"	R-63	1 7/8"	8 1/2"
16"	R-67	2"	9 1/2"
18"	R-71	2"	9 1/2"
20"	R-75	2 1/8"	10 1/2
24"	R-79	2 5/16"	11 1/2

Class 2500 – RTJ Restriction Orifice Plates

LINE SIZE	RING SIZE	A	B
1/2"	R-13	1"	6 1/2"
3/4"	R-16	1"	6 1/2"
1"	R-18	1"	6 1/2"
1 1/2"	R-23	1 1/16"	6 1/2"
2"	R-26	1 3/16"	6 1/2"
2 1/2"	R-28	1 3/16"	6 1/2"
3"	R-32	1 3/16"	6 1/2"
3 1/2"	-	1 3/16"	6 1/2"
4"	R-38	1 5/16"	6 1/2"
5"	R-42	1 7/16	7 1/2"
6"	R-47	1 7/16	7 1/2"
8"	R-51	1 9/16"	8 1/2"
10"	R-55	2"	8 1/2"
12"	R-60	2 1/8"	9 1/2"

Paddle Style Orifice Plate

NPS	DIMENSION A						B	C	THICK
	CL 150	CL 300	CL 600	CL 900	CL 1500	CL 2500
1/2	1 7/8	2 1/8	2 1/8	2 1/2	2 1/2	2 3/4	4	1.00	0.125
3/4	2 1/4	2 5/8	2 5/8	2 3/4	2 3/4	3	4	1.00	0.125
1	2 5/8	2 7/8	2 7/8	3 1/8	3 1/8	3 3/8	4	1.00	0.125
1.5	3 3/8	3 3/4	3 3/4	3 7/8	3 7/8	4 5/8	4	1.00	0.125
2	4 1/8	4 3/8	4 3/8	5 5/8	5 5/8	5 3/4	4	1.00	0.125
3	5 3/8	5 7/8	5 7/8	6 5/8	6 7/8	7 3/4	4	1.00	0.125
4	6 7/8	7 1/8	7 5/8	8 1/8	8 1/4	9 1/4	4	1.00	0.125
6	8 3/4	9 7/8	10 1/2	11 3/8	11 1/8	12 1/8	6	1.00	0.125
8	11	12 1/8	12 5/8	14 1/8	13 7/8	15 1/4	6	1.50	0.125
10	13 3/8	14 1/4	15 3/4	17 1/8	17 1/8	18 3/4	6	1.50	0.125
12	16 1/8	16 5/8	18	19 5/8	20 1/2	21 5/8	6	1.50	0.125
14	17 3/4	19 1/8	19 3/8	20 1/2	22 3/4		6	1.50	0.250
16	20 1/4	21 1/4	22 1/4	22 5/8	25 1/4		6	1.50	0.250
18	21 1/2	23 3/8	24	25	27 5/8		6	1.50	0.250
20	23 3/4	25 5/8	26 3/4	27 3/8	29 5/8		6	1.50	0.375
24	28 1/8	30 3/8	31	32 7/8	35 1/2		6	1.50	0.375

Paddle Type Restriction Orifice Plate

NPS	DIMENSION A						B	C	THICK
	CL 150	CL 300	CL 600	CL 900	CL 1500	CL 2500
1/2	1 7/8	2 1/8	2 1/8	2 1/2	2 1/2	2 3/4	4	1.00	0.125
3/4	2 1/4	2 5/8	2 5/8	2 3/4	2 3/4	3	4	1.00	0.125
1	2 5/8	2 7/8	2 7/8	3 1/8	3 1/8	3 3/8	4	1.00	0.125
1.5	3 3/8	3 3/4	3 3/4	3 7/8	3 7/8	4 5/8	4	1.00	0.125
2	4 1/8	4 3/8	4 3/8	5 5/8	5 5/8	5 3/4	4	1.00	0.125
3	5 3/8	5 7/8	5 7/8	6 5/8	6 7/8	7 3/4	4	1.00	0.125
4	6 7/8	7 1/8	7 5/8	8 1/8	8 1/4	9 1/4	4	1.00	0.125
6	8 3/4	9 7/8	10 1/2	11 3/8	11 1/8	12 1/8	6	1.00	0.125
8	11	12 1/8	12 5/8	14 1/8	13 7/8	15 1/4	6	1.50	0.125
10	13 3/8	14 1/4	15 3/4	17 1/8	17 1/8	18 3/4	6	1.50	0.125
12	16 1/8	16 5/8	18	19 5/8	20 1/2	21 5/8	6	1.50	0.125
14	17 3/4	19 1/8	19 3/8	20 1/2	22 3/4		6	1.50	0.250
16	20 1/4	21 1/4	22 1/4	22 5/8	25 1/4		6	1.50	0.250
18	21 1/2	23 3/8	24	25	27 5/8		6	1.50	0.250
20	23 3/4	25 5/8	26 3/4	27 3/8	29 5/8		6	1.50	0.375
24	28 1/8	30 3/8	31	32 7/8	35 1/2		6	1.50	0.375

Socket-weld Restriction Coupling

PRESSURE CLASS 3000						PRESSURE CLASS 6000
Nom. Pipe Size	Pipe Bore (Ref)	A	B	C	D	Nom. Pipe Size	Pipe Bore (Ref)	A	B	C	D
1/8	0.269	0.75	0.420	1.13	0.38
1/4	0.364	0.88	0.555	1.13	0.38
3/8	0.493	1.13	0.690	1.13	0.38	3/8	0.344	1.25	0.690	1.13	0.38
1/2	0.622	1.00	0.855	1.38	0.38	1/2	0.464	1.50	0.855	1.25	0.38
3/4	0.824	1.25	1.065	1.50	0.63	3/4	0.612	1.75	1.065	1.50	0.63
1	1.049	1.88	1.330	1.63	0.63	1	0.815	2.25	1.330	1.63	0.63
1 1/4	1.380	2.25	1.675	1.63	0.63	1 1/4	1.160	2.50	1.675	1.63	0.63
1 1/2	1.610	2.50	1.915	1.63	0.63	1 1/2	1.338	3.00	1.915	1.63	0.63
2	2.067	3.00	2.406	2.13	0.75	2	1.687	3.63	2.406	2.13	0.75
2 1/2	2.469	3.63	2.906	2.13	0.75	2 1/2	2.125	4.25	2.906	2.13	0.75
3	3.068	4.38	3.535	2.13	0.75	3	2.624	5.00	3.535	2.13	0.75
4	4.026	5.50	4.545	2.38	0.75	4	3.438	6.25	4.545	2.38	0.75