Proco Style 271

The Proco Style 271 rubber expansion joint is a single super-wide flowing arch design. The wide flowing arch of the Proco Style 271 is self-cleaning, which eliminates the need for a filled arch design and makes it the perfect choice for slurries.

The Style 271 can replace and be interchanged with hand-built narrow/wide arch, molded wide arch, and spherical type expansion joints. Some of the notable features and benefits of the Proco Style 271 are:

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

For more information about the features and benefits of the Proco Style 271, download our brochure.

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

UL-Certified

header

proco style 271

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. Elastomers are in accordance with NSF?ANSI 372, File MH47689 Und. Lab. Classified.

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

Neutral Length Inch/(mm)

271 Movement Capability: From Neutral Position (Non-Current)

Operating Conditions¹

Weights lbs/(kgs)²

Axial Compression Inch/(mm)

Axial Extension Inch/(mm)

Lateral Deflection Inch/(mm)

Angular Deflection³ (Degrees)

Torsional Rotation⁴ (Degrees)

Thrust Factor⁵ In2/(cm2)

Positive PSIG (Bar)

Vacuum Inches of Hg/(mm of Hg)⁶

Expansion Joint

Retaining Ring Set

Limit Rod Assembly⁷

(50)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

7.94
(51)

200
(14)

26
(660)

3.5
(1.6)

4.0
(1.8)

2.8
(1.3)

2.5

(65)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

10.63
(69)

200
(14)

26
(660)

3
(1.3)

4.5
(2.0)

2.8
(1.3)

(80)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

13.72
(89)

200
(14)

26
(660)

3
(1.3)

5.5
(2.5)

2.8
(1.3)

(100)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

21.06
(136)

200
(14)

26
(660)

4.0
(2.0)

8.0
(3.6)

2.8
(1.3)

(125)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

29.98
(193)

190
(13)

26
(660)

6.0
(2.6)

8.5
(3.9)

4.0
(1.8)

(150)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

40.47
(261)

190
(13)

26
(660)

6.0
(2.8)

9.5
(4.3)

4.0
(1.8)

(200)

6
7
8
9
10
12

152
178
203
229
254
305

1.0
(25)

0.5
(13)

66.15
(427)

190
(13)

26
(660)

9.0
(4.1)

14.5
(6.6)

8.0
(3.6)

(250)

8
9
10
12

203
229
254
305

1.2
(30)

0.5
(13)

105.27
(679)

190
(13)

26
(660)

18.0
(8.1)

17.0
(7.7)

10.0
(4.5)

(300)

8
9
10
12

203
229
254
305

1.2
(30)

0.5
(13)

144.77
(934)

190
(13)

26
(660)

20.0
(9.1)

24.5
(11.1)

10.0
(4.5)

(350)

8
9
10
12

203
229
254
305

1.2
(30)

0.5
(13)

190.55
(1229)

130
(9)

26
(660)

23.0
(10.3)

27.0
(12.2)

12.0
(5.5)

(400)

8
9
10
12

203
229
254
305

1.2
(30)

0.5
(13)

242.61
(1565)

115
(8)

26
(660)

27.0
(12.0)

33.5
(15.2)

15.0
(6.8)

(450)

8
10
12

203
254
305

1.2
(30)

0.5
(13)

300.95
(1942)

115
(8)

26
(660)

30.0
(13.4)

34.0
(15.4)

16.0
(7.3)

(500)

8
10
12

203
254
305

1.2
(30)

0.5
(13)

365.57
(2359)

115
(8)

26
(660)

36.0
(16.3)

38.0
(17.2)

16.0
(7.3)

(550)

10
12

254
305

1.2
(30)

0.5
(13)

436.47
(2816)

110
(8)

26
(660)

41.0
(18.7)

44.0
(20)

19.0
(9)

(600)

10
12

254
305

1.2
(30)

0.5
(13)

513.65
(3314)

110
(8)

26
(660)

44.5
(20.2)

48.0
(21.8)

20.0
(9.1)

(650)

10
12

254
305

1.2
(30)

0.5
(13)

597.12
(3853)

90
(6)

26
(660)

48.0
(21.8)

51.0
(23.1)

20.0
(9.1)

(700)

10
12

254
305

1.2
(30)

0.5
(13)

686.86
(4432)

90
(6)

26
(660)

53.0
(23.9)

55.0
(24.9)

28.0
(12.7)

(750)

10
12

254
305

1.2
(30)

0.5
(13)

782.88
(5051)

90
(6)

18
(450)

60.0
(27.2)

63.0
(30.8)

29.5
(13.4)

(800)

10
12

254
305

1.2
(30)

0.5
(13)

885.18
(5711)

90
(6)

18
(450)

65.0
(29.3)

68.0
(30.8)

29.5
(13.4)

(850)

10
12

254
305

1.2
(30)

0.5
(13)

993.76
(6412)

90
(6)

18
(450)

72.0
(32.8)

72.0
(32.7)

43.0
(19.5)

(900)

10
12

254
305

1.2
(30)

0.5
(13)

1108.62
(7153)

90
(6)

18
(450)

79.0
(36)

76.0
(34.5)

43.0
(19.5)

(950)

10
12

254
305

1.2
(30)

0.5
(13)

1229.76
(7934)

90
(6)

18
(450)

85.5
(38.8)

86.0
(39.0)

43.0
(19.5)

(1000)

10
12

254
305

1.2
(30)

0.5
(13)

1357.18
(8757)

90
(6)

18
(450)

91.0
(41.3)

100.0
(45.4)

43.0
(19.5)

(1050)

12
14

305
356

1.4
(36)

0.5
(13)

1507.35
(9725)

80
(5.5)

15
(450)

112.0
(50.8)

100.0
(45.4)

44.0
(20)

(1100)

12
14

305
356

1.4
(36)

0.5
(13)

1648.09
(10633)

80
(5.5)

15
(450)

123.0
(55.6)

104.0
(47.2)

44.0
(20)

(1150)

12
14

305
356

1.4
(36)

0.5
(13)

1795.10
(11582)

80
(5.5)

15
(450)

130.0
(58.8)

127.0
(57.6)

44.0
(20)

(1200)

12
14

305
356

1.4
(36)

0.5
(13)

1948.40
(12571)

80
(5.5)

15
(450)

139.0
(62.9)

132.0
(59.9)

44.0
(20)

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. 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 catalogue pressure or design working pressure of pipe system for 10 minutes is available upon request.
3. Weights are approximate and vary due to length.
4. The degree of angular movement is based on the maximum rated extension.
5. Torsional movement is expressed when the expansion joint is at neutral length.
6. 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.
7. 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.
8. 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, 7.3 Edition or table 4 in this manual) to determine correct weights.

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

Materials 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)

Adjacent³ Mating Flange Thickness

Max. Control⁴ Rod Plate Thickness Inch/(mm)

Control Rod⁶ Plate O.D. Inch/(mm)

Maximum⁷ Rod Diameter Inch/(mm)

(50)

6.00

(152.40)

4.75

(120.65)

0.750

(19.05)

0.375

(9.53)

0.472

(11.99)

Customer to Specify Mating Flange Thickness

0.375

(9.53)

10.125

(257.2)

0.625

(15.9)

2.5

(65)

7.00

(177.80)

5.50

(139.70)

0.750

(19.05)

0.375

(9.53)

0.472

(11.99)

0.375

(9.53)

11.125

(282.6)

0.625

(15.9)

(80)

7.50

(190.50)

6.00

(152.40)

0.750

(19.05)

0.375

(9.53)

0.472

(11.99)

0.375

(9.53)

11.625

(295.3)

0.625

(15.9)

(100)

9.00

(228.60)

7.50

(190.50)

0.750

(19.05)

0.375

(9.53)

0.472

(11.99)

0.375

(9.53)

13.125

(333.4)

0.625

(15.9)

(125)

10.00

(254.00)

8.50

(215.90)

0.875

(22.23)

0.375

(9.53)

0.551

(14.00)

0.500

(12.70)

14.125

(358.8)

0.625

(15.9)

(150)

11.00

(279.40)

9.50

(241.30)

0.875

(22.23)

0.375

(9.53)

0.551

(14.00)

0.500

(12.70)

15.125

(384.2)

0.625

(15.9)

(200)

13.50

(342.90)

11.75

(298.45)

0.875

(22.23)

0.375

(9.53)

0.630

(16.00)

0.750

(19.05)

19.125

(485.8)

1.000

(25.4)

(250)

16.00

(406.40)

14.25

(361.95)

1.000

(25.40)

0.375

(9.53)

0.630

(16.00)

0.750

(19.05)

21.625

(549.3)

1.000

(25.4)

(300)

19.00

(482.60)

17.00

(431.80)

1.000

(25.40)

0.375

(9.53)

0.748

(19.00)

0.750

(19.05)

24.625

(625.5)

1.000

(25.4)

(350)

21.00

(533.40)

18.75

(476.25)

1.125

(28.58)

0.375

(9.53)

0.866

(22.00)

0.750

(19.05)

26.625

(676.3)

1.000

(25.4)

(400)

23.50

(596.90)

21.25

(539.75)

1.125

(28.58)

0.375

(9.53)

0.866

(22.00)

0.750

(19.05)

30.125

(765.2)

1.250

(31.8)

(450)

25.00

(635.00)

22.75

(577.85)

1.250

(31.75)

0.375

(9.53)

0.866

(22.00)

0.750

(19.05)

31.625

(803.3)

1.250

(31.8)

(500)

27.50

(698.50)

25.00

(635.00)

1.250

(31.75)

0.375

(9.53)

0.984

(24.99)

0.750

(19.05)

34.125

(866.8)

1.250

(31.8)

(550)

29.50

(749.30)

27.25

(692.15)

1.375

(34.93)

0.375

(9.53)

0.984

(24.99)

1.000

(25.40)

36.125

(917.6)

1.250

(31.8)

(600)

32.00

(812.80)

29.50

(749.30)

1.375

(34.93)

0.375

(9.53)

0.984

(24.99)

1.000

(25.40)

38.625

(981.1)

1.250

(31.8)

(650)

34.25

(869.95)

31.75

(806.32)

1.375

(34.93)

0.375

(9.53)

0.984

(24.99)

1.000

(25.40)

40.875

(1038.2)

1.250

(31.8)

(700)

36.50

(927.10)

34.00

(863.60)

1.375

(34.93)

0.375

(9.53)

0.984

(24.99)

1.250

(31.75)

44.125

(1120.8)

1.500

(38.1)

(750)

38.75

(984.25)

36.00

(914.40)

1.375

(34.93)

0.375

(9.53)

0.984

(24.99)

1.250

(31.75)

46.375

(1177.9)

1.500

(38.1)

(800)

41.75

(1060.45)

38.50

(977.90)

1.625

(41.28)

0.375

(9.53)

0.984

(24.99)

1.250

(31.75)

49.375

(1254.1)

1.500

(38.1)

(850)

43.75

(1111.25)

40.50

(1028.70)

1.625

(41.28)

0.375

(9.53)

0.984

(24.99)

1.500

(38.10)

52.375

(1330.3)

1.750

(44.5)

(900)

46.00

(1168.40)

42.75

(1085.85)

1.625

(41.28)

0.375

(9.53)

0.984

(24.99)

1.500

(38.10)

54.625

(1387.5)

1.750

(44.5)

(950)

48.75

(1238.25)

45.25

(1149.35)

1.625

(41.28)

0.375

(9.53)

0.984

(24.99)

1.500

(38.10)

57.375

(1457.3)

1.750

(44.5)

(1000)

50.75

(1289.05)

47.25

(1200.15)

1.625

(41.28)

0.375

(9.53)

0.984

(24.99)

1.500

(38.10)

58.375

(1482.7)

1.750

(44.5)

(1050)

53.00

(1346.20)

49.50

(1257.30)

1.625

(41.28)

0.375

(9.53)

1.181

(30.00)

1.500

(38.10)

61.625

(1565.3)

1.750

(44.5)

(1100)

55.25

(1403.35)

51.75

(1314.45)

1.625

(41.28)

0.375

(9.53)

1.181

(30.00)

1.500

(38.10)

63.875

(1622.4)

1.750

(44.5)

(1150)

57.25

(1454.15)

53.75

(1365.25)

1.625

(41.28)

0.375

(9.53)

1.181

(30.00)

1.500

(38.10)

65.875

(1673.2)

1.750

(44.5)

(1200)

59.50

(1511.30)

56.00

(1422.40)

1.625

(41.28)

0.375

(9.53)

1.181

(30.00)

1.500

(38.10)

68.125

(1730.4)

1.750

(44.5)

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 271 Brochure.

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

In order to properly and successfully install a Proco Series 271 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 271 Brochure.