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Proco Style 231

Proco Style 231 single wide arch rubber expansion joints are built to withstand even the most rigorous piping system configurations. They are single wide-arch products, specifically constructed to reduce or eliminate common occurrences such as noise and vibration, misalignment/offset, or turbulence. Style 231 expansion joints are appropriate for a wide variety of industrial applications, and are available in open arch and filled arch configurations.

Some of the notable features and benefits of the Proco Style 231 are:

  • Absorption of Directional Movement
  • Less Turbulence or Material Entrapment
  • Absorption of Vibration, Noise and Shock
  • Compensation for Misalignment
  • Wide Range of Service and Lighter Weight
  • Easy Material Identification

For more information about the features and benefits of the PROCO Style 231, download our brochure.

For up-to-date pricing and availability information, contact PROCO today.

UL-Certified

Available Styles & Materials

For Specific Elastomer Recommendations, See: PROCO "Chemical To Elastomer Guide"
PROCO Material Code Cover 1,2 Elastomer Tube 1,2 Elastomer Maximum Operating Temp. °F (°C) Branding Label Color F.S.A. Material Class
BB Chlorobutyl Chlorobutyl 250 °F (121°C) Black STD. III
EE EPDM EPDM 250 °F (121°C) Red STD. III
EQ EPDM FDA-EPDM 250 °F (121°C) Red³ STD. II
NH Neoprene CSM 212 °F (100°C) Green STD. II
NN Neoprene Neoprene 225 °F (107°C) Blue STD. II
NF Neoprene FDA-Neoprene 225 °F (107°C) Blue³ STD. II
NP Neoprene Nitrile 212 °F (100°C) Yellow STD. II
NR Neoprene Natural Rubber 180 °F (82°C) White STD. I
NG Neoprene Natural Gum 180 °F (82°C) Tan STD. I

Notes:

All products are reinforced with Polyester Tire Cord
1.  Expansion Joint “Cover” can be coated with CSM UV Resistant Coating.
2.  All NN & NP elastomer designated joints meet the Coast Guard Requirements and conform to ASTM F 1123-87 and are marked accordingly.
3.  Branding Label will be marked as “Food Grade”.
4.  All elastomers above are not intended for steam service.
5.  BB or EE are good for 300°F blower service at 20 PSI or less.

 

Expansion Joint Size Nom. I.D. Inch/(mm) Neutral10
Length

Inch/(mm)
231 Movement Capability:¹-² From Neutral Position (Non-Concurrent) Operating Conditions³ Weights lbs/(kgs)4
Axial
Compression
Inch/(mm)
Axial Extension Inch/(mm) Lateral Deflection Inch/(mm) Angular Deflection (Degrees) Torsional Rotation (Degrees) Thrust Factor In2/(cm2) Positive PSIG (Bar) Vacuum Inches of Hg/(mm of Hg) Expansion Joint Retaining Ring Set Control Rod Assembly
1 (25) 6 (152) 0.6
(20)
0.4
(10)
0.5
(12)
50.4 2 5.31
(35)
200
(14)
26
(660)
2.0
(0.8)
2.0
(0.8)
2.3
(1.0)
1.25 (32) 6 (152) 0.8
(20)
0.4
(10)
0.5
(12)
43.1 2 6.38
(42)
200
(14)
26
(660)
2.5
(1.1)
2.5
(1.1)
2.3
(1.0)
1.5 (40) 6 (152) 0.8
(20)
0.4
(10)
0.5
(12)
38.1 2 7.55
(49)
200
(14)
26
(660)
3.0
(1.4)
2.5
(1.1)
2.3
(1.0)
2 (50) 6
7
8
9
10
12
(152)
(178)
(203)
(229)
(254)
(305)
1.4
(35)
0.7
(17)
0.6
(16)
34.2 2 12.57
(81)
200
(14)
26
(660)
4.0
(1.8)
4.0
(1.8)
2.8
(1.3)
2.5 (65) 6
7
8
9
10
12
(152)
(178)
(203)
(229)
(254)
(305)
1.4
(35)
0.7
(17)
0.6
(16)
27.6 2 15.90
(103)
200
(14)
26
(660)
4.5
(2.0)
4.5
(2.0)
2.8
(1.3)
3 (80) 6
7
8
9
10
12
(152)
(178)
(203)
(229)
(254)
(305)
1.4
(35)
0.7
(17)
0.6
(16)
23.0 2 19.64
(127)
200
(14)
26
(660)
5.5
(2.5)
5.5
(2.5)
2.8
(1.3)
4 (100) 6
7
8
9
10
12
(152)
(178)
(203)
(229)
(254)
(305)
1.4
(35)
0.7
(17)
0.6
(16)
18.8 2 28.27
(182)
200
(14)
26
(660)
8.0
(3.6)
8.0
(3.6)
2.8
(1.3)
5 (125) 6
7
8
9
10
12
(152)
(178)
(203)
(229)
(254)
(305)
1.6
(40)
0.8
(20)
0.7
(18)
15.2 2 43.01
(277)
190
(13)
26
(660)
9.0
(4.1)
8.5
(3.9)
4.0
(1.8)
6 (65) 6
7
8
9
10
12
(152)
(178)
(203)
(229)
(254)
(305)
1.6
(40)
0.8
(20)
0.7
(18)
12.8 2 55.42
(358)
190
(13)
26
(660)
11.0
(5.0)
9.5
(4.3)
4.0
(1.8)
8 (80) 6
7
8
9

10
12
14
(152)
(178)
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.7
(18)
9.7 2 89.95
(580)
190
(13)
26
(660)
15.0
(6.8)
14.5
(6.6)
8.0
(3.6)
10 (100) 8
9
10
12
14
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.7
(18)
9.1 2 120.76
(779)
190
(13)
26
(660)
23.0
(10.4)
17.0
(7.7)
10.0
(4.5)
12 (125) 8
9
10
12
14
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.8
(20)
7.6 2 172.03
(1110)
190
(13)
26
(660)
34.0
(15.4)
24.5
(11.0)
10.0
(4.5)
14 (150) 8
9
10
12
14
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.8
(20)
6.5 2 221.67
(1430)
130
(9.0)
26
(660)
40.0
(18.1)
27.0
(12.3)
12.0
(5.4)
16 (400) 8
9
10
12
14
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.8
(20)
5.7 2 277.59
(1791)
115
(8.0)
26
(660)
47.0
(21.3)
33.5
(15.2)
15.0
(6.8)
18 (450) 8
9
10
12
14
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.8
(20)
5.1 2 339.80
(2192)
115
(8.0)
26
(660)
56.0
(25.4)
34.0
(15.5)
16.0
(7.2)
20 (500) 8
9
10
12
14
(203)
(229)
(254)
(305)
(356)
1.6
(40)
0.8
(20)
0.8
(20)
5.7 2 408.28
(2634)
115
(8.0)
26
(660)
67.0
(30.4)
38.0
(17.3)
16.0
(7.2)
22 (550) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
5.2 2 498.76
(3218)
100
(7.0)
26
(660)
70.0
(31.8)
44.0
(20.0)
19.0
(8.6)
24 (600) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
4.8 2 581.76
(3218)
100
(7.0)
26
(660)
79.0
(35.8)
48.0
(21.8)
20.0
(9.0)
26 (650) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
4.4 2 669.66
(4320)
90
(6.0)
26
(660)
100.0
(45.4)
51.0
(23.1)
20.0
(9.0)
28 (700) 10
12
14
(254)
(305)
(356)

2.0
(50)

1.0
(25)
0.9
(23)
4.1 2 764.54
(4933)
90
(6.0)

26
(660)

102.0
(46.3)
55.0
(25.0)
28.0
(12.6)
30 (750) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
2.2 2 865.70
(5585)
90
(6.0)
26
(660)
117.0
(53.1)
63.0
(28.6)
29.5
(13.3)
32 (800) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
3.6 2 973.14
(6278)
90
(6.0)
26
(660)
120.0
(54.4)
68.0
(30.8)
33.0
(14.9)
34 (850) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0|
(25)
0.9
(23)
3.4 2 1086.87
(7012)
90
(6.0)
26
(660)
122.0
(55.3)
72.0
(32.7)
43.0
(19.5)
36 (900) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
3.2 2 1206.87
(7786)
90
(6.0)
26
(660)
143.0
(64.9)
76.0
(34.5)
43.0
(19.5)
38 (950) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
3.0 2 1333.16
(8601)
90
(6.0)
26
(660)
162.0
(73.5)
86.0
(39.0)
43.0
(19.5)
40 (1000) 10
12
14
(254)
(305)
(356)
2.0
(50)
1.0
(25)
0.9
(23)
2.9 2 1465.74
(9456)
90
(6.0)
26
(660)
173.0
(78.5)
100.0
(45.5)
43.0
(19.5)
42 (1050) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
3.3 2 1661.90
(10722)
80
(5.5)
26
(660)
193.0
(87.5)
100.0
(45.5)
44.0
(20.0)
44 (1100) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
3.1 2 1809.56
(11675)
80
(5.5)
26
(660)
198.0
(89.8)
104.0
(37.2)
44.0
(20.0)
46 (1150) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
3.0 2 1963.50
(12668)
80
(5.5)
26
(660)
205.0
(93.0)
127.0
(57.6)
44.0
(20.0)
48 (1200) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.9 2 2123.72
(13700)
80
(5.5)
26
(660)
211.0
(95.7)
132.0
(59.9)
44.0
(20.0)
50 (1250) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.8 2 2290.72
(14776)
80
(5.5)
26
(660)
240.0
(108.8)
134.0
(60.0)
44.0
(20.0)
52 (1300) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.6 2 2463.00
(15890)
80
(5.5)
26
(660)
256.0
(116.1)
136.0
(61.7)
60.0
(27.0)
54 (1350) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.6 2 2715.47
(17519)
80
(5.5)
26
(660)
265.0
(120.1)
150.0
(68.0)
63.0
(28.6)
56 (1400) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.5 2 2903.33
(18731)
80
(5.5)
26
(660)
288.0
(130.6)
165.0
(70.8)
63.0
(28.6)
58 (1450) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.4 2 3097.48
(19984)
80
(5.5)
26
(660)
300.0
(136.1)
190.0
(86.2)
66.2
(30.0)
60 (1500) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.3 2 3297.92
(21277)
80
(5.5)
26
(660)
310.0
(140.6)
200.0
(90.7)
68.3
(31.2)
66 (1650) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.1 2 3936.92
(25399)
80
(5.5)
26
(660)
350.0
(158.7)
240.0
(108.8)
71.0
(32.2)
68 (1700) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
2.0 2 4162.48
(26855)
70
(5.0)
26
(660)
368.8
(166.9)
227.0
(103.0)
76.3
(34.6)
72 (1800) 12
14
(305)
(356)
2.4
(60)
1.2
(30)
1.1
(28)
1.9 2 4632.47
(29887)
70
(5.0)
26
(660)
390.0
(176.9)
290.0
(131.5)
87.0
(39.4)
78 (1950) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.8 2 5410.60
(34907)
85
(6.0)
26
(660)
410.0
(186.0)
315.0
(142.9)
103.0
(46.7)
84 (2100) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.6 2 6221.13
(40136)
85
(6.0)
26
(660)
440.0
(200.0)
350.0
(158.0)
113.0
(51.3)
90 (2250) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.6 2 7088.11
(45730)
85
(6.0)
26
(660)
448.0
(203.1)
363.0
(164.6)
125.0
(56.7)
96 (2400) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.4 2 8011.85
(51689)
85
(6.0)
26
(660)
466.0
(211.3)
367.0
(170.5)
125.0
(56.7)
102 (2550) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.3 2 8992.02
(58013)
85
(6.0)
26
(660)
485.8
(220.0)
395.0
(179.1)
137.0
(62.1)
108 (2700) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.2 2 10028.75
(64702)
85
(6.0)
26
(660)
510.0
(231.3)
425.0
(192.7)
139.0
(63.0)
120 (3000) 12
14
(305)
(356)
2.3
(57)
1.2
(30)
1.1
(28)
1.1 2 12271.84
(79173)
85
(6.0)
26
(660)
540.0
(244.9)
565.0
(256.2)
151.0
(65.8)

NOTES:
1. Concurrent Movements – Concurrent movements are developed when two or more movements in a pipe system occur
at the same time. If multiple movements exceed single arch design there may be a need for additional arches.

To perform calculation for concurrent movement when a pipe system design has more than one movement, please use
the following formula:
formula

Calculation must be equal to or less than 1 for expansion joint to operate within concurrent movement capability.
2. Filled Arch Rubber Expansion Joints – Known as Style FA 231. The Series FA230 rubber expansion joints should be selected when there are 20% or more solids being conveyed in the pipe system. The filled arch products are manufactured with seamless tube filled with a lower durometer rubber in the arch core. The filled arch product will have a 50% reduced movement capability from the information provided in Table 4.
3. Pressure rating is based on 170˚ F operating temperature with a 4:1 safety factor. At higher temperatures, the pressure rating is reduced slightly. Hydrostatic testing at 1.5 times rated maximum catalog pressure or design working pressure of pipe system for 10 minutes is available upon request.
4. Weights are approximate and vary due to length.
5. The degree of angular movement is based on the maximum rated extension.
6. Torsional movement is expressed when the expansion joint is at neutral length.
7. Calculation of Thrust (Thrust Factor). When expansion joints are installed in the pipeline, the static portion of the thrust is calculated as a product of the area of the I.D. of the arch of the expansion joint times the maximum pressure (design, test or surge) that will occur in the line. The result is a force expressed in pounds. Take Design, surge or test pressure X thrust factor to calculate end thrust.
8. Parts listed at 26” Hg / 660 mm Hg vacuum have a design rating of 30” Hg / 762 mm Hg (full vacuum). Vacuum rating is based on neutral installed length, without external load. Products should not be installed “extended” on vacuum applications.
9. Limit rod unit weight consists of one rod with washers, nuts and two limit rod plates. Multiply number of limit rods needed for the application (as specified in the Fluid Sealing Association’s Technical Handbook, Seventh Edition) to determine correct weights.

 Table 5 Standard Drilling for PROCO Rubber Expansion Joints Thickness of Materials for PROCO Rubber Expansion Joints Control Unit Plate Detail
Nominal Pipe
Size Expansion Joint I.D. Inch/(mm)
Flange Dimensions² Material Thickness¹ for Bolt Length Requirements
Flange O.D. Inch/(mm) Bolt Circle Inch/(mm) Number of Holes Size of Holes Inch/(mm) Retaining Rings Thickness Inch/(mm) Rubber Flange Thickness Inch/(mm) Adjacent Mating Flange Thickness Max. Control Rod Plate Thickness Inch/(mm) Control Rod Plate O.D. Inch/(mm) Maximum Rod Diameter Inch/(mm)
1 (25) 4.25 (107.95) 3.13 (79.50) 4 0.625 (15.9) 0.375 (9.53) 0.472 (11.99) Customer to Specify Mating Flange Thickness 0.625 (15.9) 8.375 (212.7) 0.625 (15.9)
1.25 (32) 4.63 (117.60) 3.50 (88.90) 4 0.625 (15.9) 0.375 (9.53) 0.472 (11.99) 0.625 (15.9) 8.750 (222.3) 0.625 (15.9)
1.5 (40) 5.00 (127.00) 3.88 (98.55) 4 0.625 (15.9) 0.375 (9.53) 0.472 (11.99) 0.375 (9.5) 9.125 (231.8) 0.625 (15.9)
2 (50) 6.00 (152.40) 4.75 (120.65) 4 0.750 (19.1) 0.375 (9.53) 0.472 (11.99) 0.500 (12.7) 10.125 (257.2) 0.625 (15.9)
2.5 (65) 7.00 (177.80) 5.50 (139.70) 4 0.750 (19.1) 0.375 (9.53) 0.472 (11.99) 0.500 (12.7) 11.125 (282.6) 1.000 (25.4)
3 (80) 7.50 (190.50) 6.00 (152.40) 4 0.750 (19.1) 0.375 (9.53) 0.472 (11.99) 0.500 (12.7) 11.625 (295.3) 1.000 (25.4)
3.5 (90) 8.50 (215.90) 7.00 (177.80) 8 0.750 (19.1) 0.375 (9.53) 0.472 (11.99) 0.625 (15.9) 12.625 (320.7) 1.000 (25.4)
4 (100) 9.00 (228.60) 7.50 (190.50) 8 0.750 (19.1) 0.375 (9.53) 0.472 (11.99) 0.625 (15.9) 13.125 (333.4) 1.000 (25.4)
5 (125) 10.00 (254.00) 8.50 (215.90) 8 0.875 (22.2) 0.375 (9.53) 0.551 (14.00) 0.625 (15.9) 14.125 (358.8) 1.000 (25.4)
6 (150) 11.00 (279.40) 9.50 (241.30) 8 0.875 (22.2) 0.375 (9.53) 0.551 (14.00) 0.500 (12.7) 15.125 (384.2) 1.000 (25.4)
8 (200) 13.50 (342.90) 11.75 (298.45) 8 0.875 (22.2) 0.375 (9.53) 0.630 (16.00) 0.750 (19.1) 19.125 (485.8) 1.000 (25.4)
10 (250) 16.00 (406.40) 14.25 (361.95) 12 1.000 (25.4) 0.375 (9.53) 0.630 (16.00) 0.750 (19.1) 21.625 (549.3) 1.000 (25.4)
12 (300) 19.00 (482.60) 17.00 (431.80) 12 1.000 (25.4) 0.375 (9.53) 0.748 (19.00) 0.750 (19.1) 24.625 (625.5) 1.000 (25.4)
14 (350) 21.00 (533.40) 18.75 (476.25) 12 1.125 (28.6) 0.375 (9.53) 0.866 (22.00) 0.750 (19.1) 26.625 (676.3) 1.000 (25.4)
16 (400) 23.50 (596.90) 21.25 (539.75) 16 1.125 (28.6) 0.375 (9.53) 0.866 (22.00) 0.750 (19.1) 30.125 (765.2) 1.250 (31.8)
18 (450) 25.00 (635.00) 22.75 (577.85) 16 1.250 (31.8) 0.375 (9.53) 0.866 (22.00) 0.750 (19.1) 31.625 (803.3) 1.250 (31.8)
20 (500) 27.50 (698.50) 25.00 (635.00) 20 1.250 (31.8) 0.375 (9.53) 0.984 (24.99) 0.750 (19.1) 34.125 (866.8) 1.250 (31.8)
22 (550) 29.50 (749.30) 27.25 (692.15) 20 1.375 (34.9) 0.375 (9.53) 0.984 (24.99) 1.000 (25.4) 36.125 (917.6) 1.250 (31.8)
24 (600) 32.00 (812.80) 29.50 (749.30) 20 1.375 (34.9) 0.375 (9.53) 0.984 (24.99) 1.000 (25.4) 38.625 (981.1) 1.250 (31.8)
26 (650) 34.25 (869.95) 31.75 (806.32) 24 1.375 (34.9) 0.375 (9.53) 0.984 (24.99) 1.000 (25.4) 40.875 (1038.2) 1.250 (31.8)
28 (700) 36.50 (927.10) 34.00 (863.60) 28 1.375 (34.9) 0.375 (9.53) 0.984 (24.99) 1.250 (38.1) 44.125 (1120.8) 1.500 (31.8)
30 (750) 38.75 (984.25) 36.00 (914.40) 28 1.375 (34.9) 0.375 (9.53) 0.984 (24.99) 1.250 (38.1) 46.375 (1177.9) 1.500 (31.8)
32 (800) 41.75 (1060.45) 38.50 (977.90) 28 1.625 (41.3) 0.375 (9.53) 0.984 (24.99) 1.250 (38.1) 49.375 (1254.1) 1.500 (31.8)
34 (850) 43.75 (1111.25) 40.50 (1028.70) 32 1.625 (41.3) 0.375 (9.53) 0.984 (24.99) 1.500 (38.1) 52.375 (1330.3) 1.750 (44.5)
36 (900) 46.00 (1168.40) 42.75 (1085.85) 32 1.625 (41.3) 0.375 (9.53) 0.984 (24.99) 1.500 (38.1) 54.625 (1387.5) 1.750 (44.5)
38 (950) 48.75 (1238.25) 45.25 (1149.35) 32 1.625 (41.3) 0.375 (9.53) 0.984 (24.99) 1.500 (38.1) 57.375 (1457.3) 1.750 (44.5)
40 (1000) 50.75 (1289.05) 47.25 (1200.15) 36 1.625 (41.3) 0.375 (9.53) 0.984 (24.99) 1.500 (38.1) 58.375 (1482.7) 1.750 (44.5)
42 (1050) 53.00 (1346.20) 49.50 (1257.30) 36 1.625 (41.3) 0.375 (9.53) 1.181 (30.00) 1.500 (38.1) 61.625 (1565.3) 1.750 (44.5)
44 (1100) 55.25 (1403.35) 51.75 (1314.45) 40 1.625 (41.3) 0.375 (9.53) 1.181 (30.00) 1.500 (38.1) 63.875 (1622.4) 1.750 (44.5)
46 (1150) 57.25 (1454.15) 53.75 (1365.25) 40 1.625 (41.3) 0.375 (9.53) 1.181 (30.00) 1.500 (38.1) 65.875 (1673.2) 1.750 (44.5)
48 (1200) 59.50 (1511.30) 56.00 (1422.40) 44 1.625 (41.3) 0.375 (9.53) 1.181 (30.00) 1.500 (38.1) 68.125 (1730.4) 1.750 (44.5)
50 (1250) 61.75 (1568.45) 58.25 (1479.55) 44 1.875 (47.6) 0.375 (9.53) 1.181 (30.00) 1.500 (38.1) 70.375 (1787.5) 1.750 (44.5)
52 (1300) 64.00 (1625.60) 60.50 (1536.70) 44 1.875 (47.6) 0.375 (9.53) 1.181 (30.00) 1.750 (44.5) 73.625 (1870.7) 2.000 (50.8)
54 (1350) 66.25 (1682.75) 62.75 (1593.85) 44 2.000 (50.8) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 75.875 (1927.2) 2.000 (50.8)
56 (1400) 68.75 (1746.25) 65.00 (1651.00) 48 1.875 (47.6) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 78.375 (1990.7) 2.000 (50.8)
58 (1450) 71.00 (1803.40) 67.25 (1708.15) 48 1.875 (47.6) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 80.625 (2047.9) 2.000 (50.8)
60 (1500) 73.00 (1854.20) 69.25 (1758.95) 52 2.000 (50.8) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 82.625 (2098.7) 2.000 (50.8)
66 (1650) 80.00 (2032.00) 76.00 (1930.40) 52 2.000 (50.8) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 89.625 (2276.5) 2.000 (50.8)
68 (1700) 82.25 (2089.15) 78.25 (1987.55) 56 2.000 (50.8) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 91.875 (2333.6) 2.000 (50.8)
72 (1800) 86.50 (2197.10) 82.50 (2095.50) 60 2.000 (50.8) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 96.125 (2441.6) 2.000 (50.8)
78 (1950) 93.00 (2362.20) 89.00 (2260.60) 64 2.125 53.0) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 103.125 (2619.4) 2.250 (57.2)
84 (2100) 99.75 (2533.65) 95.50 (2425.70) 64 2.250 (57.2) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 109.875 (2790.8) 2.250 (57.2)
90 (2250) 106.50 (2705.10) 102.00 (2590.80) 68 2.375 (60.3) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 1117.125 (2975.0) 2.500 (63.5)
96 (2400) 113.25 (2876.55) 108.50 (2755.90) 68 2.500 (63.5) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 124.625 (3165.9) 2.750 (69.9)
102 (2550) 120.00 (3048.00) 114.50 (2908.30) 72 2.625 (66.7) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 131.375 (3336.5) 2.750 (69.9)
108 (2700) 126.75 (3219.45) 120.75 (3067.05) 72 2.625 (66.7) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 138.125 (3508.4) 2.750 (69.9)
120 (3000) 140.25 (3562.35) 132.75 (3371.85) 76 2.875 (73.0) 0.375 (9.53) 1.181 (30.00) 2.000 (50.8) 152.125 (3864.0) 3.000 (76.2)

Metric Conversion Formula: Nominal I.D.: in. x 25 = mm; Dimensions/Thickness’: in. x 25.4 = mm.

Notes:
1. Limit/Control Rod length is determined by neutral length of rubber expansion joint, rated extension, control rod plate thickness, mating flange thickness and number of nuts. Consult PROCO for rod lengths.
2. Flange Dimensions shown are in accordance with ANSI B16.1 and ANSI B16.5 Class 125/150, AWWA C-207-07, Tbl 2 and 3 – Class D, Table 4 – Class E. Hole size shown is 1/8” larger than AWWA Standard.
3. Adjacent mating flange thickness is required to determine overall rod length and compression sleeve length (if required).
4. Plate thickness is based on a maximum width PROCO would use to design a Limit/Control Rod plate.
5. Flat Washers required at ring splits and are supplied by others.
6. Control rod plate O.D. installed dimension is based on a maximum O.D. Proco would supply.
7. Control rod diameter is based on a maximum diameter Proco would use to design a control rod.

A control rod unit consists of limit rods, tie rods, or compression sleeves, and a control unit assembly is a system of two or more control rod units placed across an expansion joint from flange to flange. Its purpose is to minimize possible damage caused by excessive motion of a pipeline. Control unit assemblies can be set at the maximum allowable expansion and / or contraction of the rubber expansion joint.

When used properly, control unit assemblies serve as additional safety enhancements, and can minimize possible damage due to adjacent equipment.

Rubber expansion joints should be installed between two fixed anchor points in a piping system. When proper anchoring can’t be provided, control units are required. When an un-anchored piping system is encountered, nuts should be tightened securely against the rod plate, to prevent over-extension due to pressure thrust caused by the expansion joint.

Listed below are three control unit configurations supplied by Proco that are commonly used with rubber expansion joints in piping systems.

  • Figure 1 – Limit Rod: A limit rod control unit configuration will allow an expansion joint to lengthen to a predetermined extension setting. Spherical washers can also be furnished (upon request) to combat any “nut to plate” binding during offset.
  • Figure 2 – Limit / Control Rod: This type of configuration is used to allow specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint axial extension) movements. Spherical washers can also be furnished (upon request) to combat any “nut to plate” binding during offset.
  • Figure 3 – Compression Sleeve: A compression sleeve configuration is used to allow for specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint extension) movements. Proco will supply each compression sleeve equipped to allow for no axial movement, unless otherwise specified at time of purchase. Spherical washers can also be furnished (upon request) to combat any “nut to plate” binding during offset.

For more information on Proco control unit specifications, download our Series 230 Brochure.

For up-to-date pricing and availability information, contact PROCO today.

Nominal Pipe Size Expansion Joint I.D. Inch / (mm) Number of Control Rods Recommended
 2  4  6 8
2 (51) 661
(102) 311 622 • 
6 (152) 186 371 •  • 
(203) 163 326 •  • 
10 (254) 163 325 488
12 (305) 160 320 481
14 (356) 112 223 335
16 (406) 113 227 340 453
18 (457) 94 187 281 375
20 (508) 79 158 236 315
22 (559) 85 171 256 342
24 (610) 74 147 221 294
26 (660) 62 124 186 248
28 (711) 65 130 195 261
30 (762) 70 141 211 281
32 (813) 63 125 188 251
34 (864) 72 143 215 286
36 (914) 79 138 207 276
38 (965) 63 125 188 251
40 (1016) 42 85 127 169
42 (1067) 48 96 144 192
44 (1118) 44 88 133 177
46 (1168) 41 82 122 163
48 (1219) 40 81 141 161
50 (1270) 37 75 112 150
52 (1321) 35 70 105 140
54 (1372) 43 86 128 171
56 (1422) 40 80 120 160
58 (1473) 38 75 113 150
60 (1524) 35 71 106 141
62 (1575) 33 66 100 133
66 (1676) 30 59 89 119
72 (1829) 25 50 75 101
78 (1981) 28 56 84 112
84 (2134) 24 49 73 98
90 (2286) 26 53 79 106
98 (2489) 29 58 86 115
102 (2591) 25 51 76 102
108 (2743) 23 46 75 92
120 (3048) 18 37 56 75

Notes:
1. Pressures listed above do not relate to the actual design pressure of the expansion joint products, but are the maximum surge or pressure for a specific control rod nominal pipe size.

 

In order to properly and successfully install a Proco Series 230 rubber expansion joint, specific conditions must be met, as well as ensuring the process is implemented by following our guidelines.

For detailed information on service conditions, proper alignment, anchoring, and storage techniques, download the Proco Series 230 Brochure.