raci, the leaders in casing spacer technology, has been in business since 1952 and are ISO 9001:2000 CERTIFIED. Their uniquely designed, engineered and patented spacers are respected and their dependability has made them the number one choice of specifiers and installers worldwide.

raci Casing Spacers isolate water, sewer, oil and gas pipelines from casings simply and cost effectively.

Insulators/Spacers are required to separate casing and carrier pipes with the following criteria:

  • Must ensure electrical insulation between the two pipes
  • Permanently prevent bells from sliding or resting on casing pipe
  • Must fasten tightly on the carrier pipe to ensure no horizontal movement during insertion
  • Must be made of materials which do not conduct electricity and are permanently resistant to chemical corrosion
  • Must be resistant to both mechanical and thermal shocks and stresses particularly during installation

raci SPACER ADVANTAGES

raci spacers have met the above requirements with the following advantages over the standard skid and strap application and other models of manufactured spacers.

  • Spacers are manufactured entirely out of high density polyethylene with NO METAL bolts or attachments required.
  • Spacers are quickly and easily assembled by manually fitting elements one into the other.
  • Tooth insertion method allows on site adjustment to fit a wide range of pipe diameters and coatings.
  • Spacers slide into casing with ease.
  • Spacers maintain continual long term support for the carrier pipe and its contents.
  • Spacers provide constant projections around the entire circumference of the carrier pipe.
  • Spacers provide long term corrosion protection.
  • Spacers can be installed on coated or plain concrete, ductile iron, plastic and steel pipe.

The spacers are divided into four groups which address a wide range of pipe sizes and weights. Within each grouping there are varying support heights that allow the spacer to clear bell joints, flanges, couplings, and other jointing methods. These heights range from .78 inches to 5.11 inches (20 - 130 mm).

SPECIAL APPLICATIONS: For applications with temperatures in excess of 60° C / 140° F spacers are available in nylon. On request spacers can be manufactured in other types of plastic material according to the mechanical and temperature requirements of the pipeline.

The HDPE spacer is manufactured by injection molding. This gives it a high impact strength and a low coefficient of friction which exceeds industry standards. Each spacer element represents a flexible section that has a toothed male butt strap at one end and an appropriately toothed female slot on the other end. Absolutely no metallic parts are involved in their assembly. This design allows for on site adjustments for any variances within the O.D. range. Coupled with their flexibility they cover all types of pipe from O.D. range 1.18 inches (30 mm) and upward.

SPACING raci SPACERS

The spacing of the rings must ensure that the carrier pipe is fully supported throughout its length. To ensure against the effects of differential loading at the entrance and exit points of the casing, two rings are used at the beginning and end of the each casing, regardless of pipe size or length.
 

SELECTION GUIDELINES

The selection of spacer type depends on the following dimensions:

  • exact carrier pipe O.D.
  • exact bell, flange or coupling O.D.
  • exact casing Pipe I.D.
  • clearance desired between casing and carrier pipe
  • length of application and linear weight of filled carrier pipe

With the above information and using the charts from Product Details, the type and number of spacer elements required for each ring and how far they will be spaced can be determined.

INSTRUCTIONS FOR RING ASSEMBLY

  • In cases where the carrier pipe is plastic, the contact zone between the pipe and spacer should be taped to ensure a textured contact area. Double backed tape should be either self amalgamating or bituminous.
  • Insert the male butt strap three teeth into the slotted female end of the next element.. Continue until you have formed a chain of the required number of elements.
  • To complete the ring, wrap the spacer loosely around the pipe and complete the last linking by hand.
  • Pull each of the butt straps together by hand until the spacer is tightened uniformly on the pipe.
  • The final tightening is done using the special clamping tool for the spacer type.

SPECIFICATIONS SUGGESTIONS FOR raci CASING SPACERS

Casing spacers shall be used to install carrier pipe inside the encasement pipe. To provide support around the periphery of the pipe should the pipe twist as it is pushed through the casing. The spacers shall be of a projection type that has a minimum number of projections around the circumference totaling the number of diameter inches. For example, 8" pipe shall have a minimum of 8 projections and 18" pipe shall have a minimum of 18 projections.

Casing spacers shall use double backed tape, provided with the spacers, to fasten tightly onto the carrier pipe so that the spacers do not move during installation. Installation instructions shall be provided with each shipment. Casing spacers shall have a span of 10 feet to 6-1/2 feet dependent on the total load anticipated with the pipe full of liquid. On sewer pipe, the maximum span should be 7 feet to prevent sagging of the carrier pipe. The maximum load shall not exceed the load limits per spacer listed in the brochure. These values in the brochure include conservative safety factors for class spacer used. Spacers shall have minimum height that clears the pipe bell or as otherwise indicated on plans.

Casing spacers shall be projection type totally non-metallic spacers constructed of preformed sections of high-density polyethylene. Spacers shall be ISO 9002 certified for strength and quality. Projection type spacers shall be raci type spacers along with wrap around end seal made of 1/8" think rubber with stainless steel bands. (See Public Works Marketing product model "1WA Wrap Around End Seals" or call 800.517.0395)

raci SPACER PRODUCT DETAILS


S/T
Small Diameter Pipe
1.18 - 6.46 inches or 30-164 mm
F/G
Small to Medium Diameter Pipe
3.62-20.79 inches or 92-528 mm



M/N
Medium Diameter Pipe
5.63-32.68 inches or 143-830 mm


E/H
Large Diameter Pipe
8.7-134..41 inches or 221-3414 mm



P/Q
Medium Diameter Pipe
5.63-23.23 inches or 143-590 mm


A/B
Small Diameter Pipe
2.17-11.06 inches or 55-281 mm

raci SPACER CLAMPS
 

  1. Type 1 used for Elements F and G
  2. Type 2 used for Elements E and H (25-90)
  3. Type 3 used for Elements S and T
    Type 3B used for Elements A and B
  4. Type 4 used for Elements E and H (110-130)
  5. Type 5 used for Elements M and N
    Type 5B used for Elements P and Q
  6. Channel Lock Tool used for Elements F, G,M and N

SELECTING raci SPACERS

Spacer Elements S and T (small diameter pipe)
These spacers are linked by a tongue and groove method. S and T spacers are able to support a maximum weight load of 250 lb. / 110 kg. per ring. They are best suited for pipe ranges 1.18 - 4.13 inches (30 - 105 mm).

For installation the Clamping Tool Type 3 is used.  O.D. range 1.18 - 6.46 inches (30 -164 mm)

TYPE S and T 20 mm
element support height of .78 inches
O.D. range inches O.D. range millimeters No. of elements to make a  RING Spacing between rings
min max min max S T ft. m.
1.18 1.38 30 35 1   5 1.5
1.50 1.69 38 43   1 5 1.5
2.36 2.76 60 70 2   5 1.5
2.68 2.99 68 76 1 1 5 1.5
3.03 3.39 77 86   2 6-10 1.5
3.54 4.13 90 105 3   6-10 1.5
4.17 4.72 106 120 1 2 6-10 1.5
4.76 5.43 121 138 4   6-10 1.5
5.47 6.06 139 154 2 2 6-10 1.5
6.10 6.46 155 164 1 3 *6-10 1.5
maximum load 250 lbs or 110 kgs per ring
*MAXIMUM LOAD MUST NOT EXCEED 250 LBS OR 110 KGS PER RING

NOTICE:
Distance between spacers must be calculated so the maximum load per spacer ring does not exceed the max. load carrying capacity for the type used. (S&T 250lb/110 kg, F&G 1102 lb/500 kg, P&Q 1213 lb/550 kg, M&N 2204 lb/1000 kg, E&H 5952 lb/2700 kg, A&B 397 lb/180 kg) -/spacer ring. Maximum load per spacer is calculated based on the weight of the pipe filled with liquid divided by the number of spacer rings installed. The maximum distance of 10 feet/3 meters shall not be exceeded due to the danger of the pipe sagging between the spacers support points unless the pipe manufacturer states differently.

Spacer Elements F and G (small to medium diameter pipe)
These spacers are engineered to be used on small to medium sized pipe and are able to support a maximum weight load of 1102 lb. / 500 kg. per ring.  F and G spacers are best suited for pipe ranges 3.62 to 17.56 inches (92 to 406 mm).

For installation the Clamping Tool Type 1 or 4A is used. Channel Lock tool also available.

TYPE F and G 25, 41, 60 and 75 mm
element support heights of .98, 1.6, 2.36 and 2.95 inches
O.D. range inches O.D. range millimeters No. of elements to make a RING Spacing between rings
min max min max F G ft. m.
3.62 4.53 92 115 1 1 6-10 1.8-3.0
4.57 5.98 116 152 2   6-10 1.8-3.0
6.02 7.40 153 188 2 1 6-10 1.8-3.0
7.44 8.34 189 224 3   6-10 1.8-3.0
8.35 10.24 225 260 3 1 6-10 1.8-3.0
10.28 11.61 261 295 4   6-10 1.8-3.0
11.65 12.32 296 313 4 1 6-10 1.8-3.0
12.36 14.80 314 376 5   6-10 1.8-3.0
14.84 17.56 377 446 6   6-10 1.8-3.0
17.60 20.79 447 528 7   *6-10 1.8-3.0
maximum load 1102 lbs or 500 kgs per ring
*MAXIMUM LOAD MUST NOT EXCEED 1102 LBS OR 500 KGS PER RING

NOTICE:
Distance between spacers must be calculated so the maximum load per spacer ring does not exceed the max. load carrying capacity for the type used. (S&T 250lb/110 kg, F&G 1102 lb/500 kg, P&Q 1213 lb/550 kg, M&N 2204 lb/1000 kg, E&H 5952 lb/2700 kg, A&B 397 lb/180 kg) -/spacer ring. Maximum load per spacer is calculated based on the weight of the pipe filled with liquid divided by the number of spacer rings installed. The maximum distance of 10 feet/3 meters shall not be exceeded due to the danger of the pipe sagging between the spacers support points unless the pipe manufacturer states differently.

Spacer Elements P and Q (medium diameter pipe)
The P and Q spacer is designed for that middle pipe O.D. range application. They are able to support a maximum weight load of 1653 lb. / 750 kg. per ring. The P and Q spacers are best suited for the pipe range 6.00 to 12.0 inches (152mm to 305mm). Ranges above 12" contact your discributor. 

For installation the Clamping Tool Type 6 or 4A is used.

TTYPE P and Q 110 and 120 mm
support heights of 4.33 and 4.73 inches
O.D. range inches/font> O.D. range millimeters No. of elements to make a  RING Spacing between rings
min max min max P Q ft. m.
5.63 6.61 143 168 1 1 6-10 1.8-3.0
6.65 7.91 169 201 2   6-10 1.8-3.0
7.95 8.94 202 227 1 2 6-10 1.8-3.0
8.98 9.92 228 252 2 1 6-10 1.8-3.0
9.96 11.26 253 286 3   6-10 1.8-3.0
11.30 12.24 287 311 2 2 6-10 1.8-3.0

12.28 13.27 312 337 3 1 *6-10 1.8-3.0
13.31 15.55 338 395 4   *6-10 1.8-3.0
15.59 16.57 396 421 4 1 *6-10 1.8-3.0
16.61 19.88 422 505 5   *6-10 1.8-3.0
19.92 23.23 506 590 6   *4.9 1.5
maximum load 1213 lbs or 550 kgs per ring
*MAXIMUM LOAD MUST NOT EXCEED 1213 LBS OR 550 KGS PER RING

NOTICE:
Distance between spacers must be calculated so the maximum load per spacer ring does not exceed the max. load carrying capacity for the type used. (S&T 250lb/110 kg, F&G 1102 lb/500 kg, P&Q 1213 lb/550 kg, M&N 2204 lb/1000 kg, E&H 5952 lb/2700 kg, A&B 397 lb/180 kg) -/spacer ring. Maximum load per spacer is calculated based on the weight of the pipe filled with liquid divided by the number of spacer rings installed. The maximum distance of 10 feet/3 meters shall not be exceeded due to the danger of the pipe sagging between the spacers support points unless the pipe manufacturer states differently.

Spacer Elements M and N (medium diameter pipe)
The M and N spacer is designed for that middle pipe O.D. range application. They are able to support a maximum weight load of 2865 lb. / 1300 kg. per ring. The M and N spacers are best suited for the pipe range 13.31 to 29.88 inches (358 to 764 mm).

For installation the Clamping Tool Type 5 or 4A is used. Channel Lock tool is also available.

TYPE M and N 18, 36, 50, 75, and 90 mm
support heights of 0.7, 1.42, 1.97, 2.95, and 3.54 inches
O.D. range inches O.D. range millimeters No. of elements to make a  RING Spacing between rings
min max min max M N ft. m.
5.63 6.61 143 168 1 1 6-10 1.8-3.0
6.65 7.91 169 201 2   6-10 1.8-3.0
7.95 8.94 202 227 1 2 6-10 1.8-3.0
8.98 9.92 228 252 2 1 6-10 1.8-3.0
9.96 11.26 253 286 3   6-10 1.8-3.0
11.30 12.24 287 311 2 2 6-10 1.8-3.0
12.28 13.27 312 337 3 1 6-10 1.8-3.0
13.31 15.55 338 395 4   6-10 1.8-3.0
15.59 16.57 396 421 4 1 6-10 1.8-3.0
16.61 19.88 422 505 5   6-10 1.8-3.0
19.92 23.23 506 590 6   *4-10 1.5-3.0
23.27 26.54 591 674 7   *4-10 1.5-3.0
26.57 29.88 675 759 8   *4.6 1.5
29.92 32.68 760 830 9   *4.6 1.5
maximum load 2,865 lbs or 1,300 kgs per ring
* MAXIMUM LOAD MUST NOT EXCEED 2865 LBS OR 1300 KGS PER RING

NOTICE:
Distance between spacers must be calculated so the maximum load per spacer ring does not exceed the max. load carrying capacity for the type used. (S&T 250lb/110 kg, F&G 1102 lb/500 kg, P&Q 1213 lb/550 kg, M&N 2865 lb/1300 kg, E&H 5952 lb/2700 kg, A&B 397 lb/180 kg) -/spacer ring. Maximum load per spacer is calculated based on the weight of the pipe filled with liquid divided by the number of spacer rings installed. The maximum distance of 10 feet/3 meters shall not be exceeded due to the danger of the pipe sagging between the spacers support points unless the pipe manufacturer states differently.

Spacer Elements E and H (large diameter pipe)

For large diameter pipe, heavier applications or long casings where maximum strength is required the E and H elements are used. They are able to support a maximum weight load of 5925 lb. / 2700 kg. per ring.

For installation, the Clamping Tool Type 2 is used for support heights 25 mm to 90 mm.

Tool Type 4 is used for heights 110 mm to 130 mm.



 
TYPE E and H 25, 41, 60, 75, 90, 110 and 130 mm
element support heights of .98, 1.6, 2.36, 2.95, 3.54, 4.33 and 5.11 inches
O.D range
inches		 O.D. range millimeters No. of elements to make a RING Spacing between rings
min max min max E H ft. m.
8.70 10.55 221 268 2 1 6 1.8
10.59 12.60 269 320 3   6 1.8
12.64 14.41 321 366 3 1 6 1.8
14.45 16.54 367 420 4   6 1.8
16.57 18.31 421 465 4 1 6 1.8
18.35 20.87 466 530 5   6 1.8
20.91 24.80 531 630 6   6 1.8
24.84 28.74 631 730 7   6 1.8
28.78 32.68 731 830 8   6 1.8
32.72 36.61 831 930 9   6 1.8
36.65 40.55 931 1030 10   *4-10 1.5-3.0
40.59 45.63 1031 1159 11   *4-10 1.5-3.0
45.67 53.54 1160 1360 13   *4-10 1.5-3.0
53.58 62.99 1361 1600 15   *4-10 1.5-3.0
3.03 70.83 1601 1799 17   1.9 0.6
70.87 83.07 1800 2110 20   1.9 0.6
83.11 95.67 2111 2430 23   1.9 0.6
95.71 112.60 2431 2860 27      
112.64 134.41 2861 3414 32      
max load 5952 lbs or 2700 kgs per ring
*MAXIMUM LOAD MUST NOT EXCEED 5952 LBS OR 2700 KGS PER RING

NOTICE:
Distance between spacers must be calculated so the maximum load per spacer ring does not exceed the max. load carrying capacity for the type used. (S&T 250lb/110 kg, F&G 1102 lb/500 kg, P&Q 1213 lb/550 kg, M&N 2204 lb/1000 kg, E&H 5952 lb/2700 kg, A&B 397 lb/180 kg) -/spacer ring. Maximum load per spacer is calculated based on the weight of the pipe filled with liquid divided by the number of spacer rings installed. The maximum distance of 10 feet/3 meters shall not be exceeded due to the danger of the pipe sagging between the spacers support points unless the pipe manufacturer states differently.

Spacer Elements A and B (smaller diameter pipe)

For smaller diameter pipe, the A and B elements are used. They are able to support a maximum weight load of 397 lb. / 180 kg. per ring.

For installation, the Clamping Tool Type 3B is used.

 

 
TYPE A and B 19, 36 and 50 mm
element support heights of .75, 1.42 and 1.97 inches
O.D range
inches		 O.D. range millimeters No. of elements to make a RING Spacing between rings
min max min max A B ft. m.
2.17 2.52 55 64   2 6.5 2
2.36 2.76 60 70 1 1 6.5 2
2.68 3.03 68 77 2   6.5 2
3.35 3.86 85 98   3 6.5 2
3.54 4.17 90 106 1 2 5 2
3.86 4.57 98 116 3   5 1.5
4.65 5.20 118 132   4 5 1.5
4.92 5.51 125 140 1 3 5 1.5
5.51 6.22 140 158 4   5 1.5
6.22 7.09 158 180 2 3 5 1.5
7.01 7.87 178 200 5   5 1.5
7.87 9.45 200 240   7 5 1.5
8.46 9.53 215 242 6   5 1.5
9.41 10.71 239 272 6 1 5 1.5
9.65 11.06 245 281 7   5 1
max load 397 lbs or 180 kgs per ring
*MAXIMUM LOAD MUST NOT EXCEED 397 LBS OR 180 KGS PER RING

NOTICE:
Distance between spacers must be calculated so the maximum load per spacer ring does not exceed the max. load carrying capacity for the type used. (S&T 250lb/110 kg, F&G 1102 lb/500 kg, P&Q 1213 lb/550 kg, M&N 2204 lb/1000 kg, E&H 5952 lb/2700 kg, A&B 397 lb / 180 kg) -/spacer ring. Maximum load per spacer is calculated based on the weight of the pipe filled with liquid divided by the number of spacer rings installed. The maximum distance of 10 feet/3 meters shall not be exceeded due to the danger of the pipe sagging between the spacers support points unless the pipe manufacturer states differently.

Physical Characteristics Of Specifically Designed High Density Polyethylene For raci Spacers

Yield Strength 3625 PSI 25 N/mm ASTM D 638
Tensile Strength 2900 PSI 20 N/mm ASTM D 638
Elongation At Break 800% 800% ASTM D 638
Hardness Shore D 65 65 ASTM D 2240
Minimum Working Temperature -4° F -20° C  
Dielectric Strength   >940 Kv/inch    >37 Kv/mm    ASTM 149/64 
UVL Stabilization yes yes  

 

raci Casing Spacers and Dual Containment Pipe Spacers Range of Applications:
For pipe sizes from 1.5" to 150" +

• Municipal Water Pipe and Water Transmission Pipeline Cased Crossings
• Municipal Sewer Pipe Cased Crossings
• Oil and Gas Pipeline Cased Crossings and Casings along Highways, Roads, and Railroads
• Drainage lines that need to be protected and in double containment
• Dual Containment pipe application for waste water and hazardous materials (for concentrated hazardous materials please contact your distributor for chemical resistance tables)