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GENERAL INFORMATION
High Density Polyethylene (HDPE) insulators are universally applicable in the installation of pipelines when the carrier pipe runs inside a casing. Plastic insulators provide many advantages for these applications:
Easy penetration of carrier pipe. The coefficient of friction of the insulators is reduced to a minimum because they are made of plastic.
A wide range of skid heights ensures concentricity of the carrier pipe in the casing if required.
The minimized friction prevents damage to the casing coating and insulation of the pipes.
Excellent insulation characteristics of materials used. All requirements of cathodic pipe protection are met.
Insulators are suitable for all pipe diameters from 25 mm upwards and many skid heights are available to suit specific requirements.
TECHNICAL DATA
Materials
High Density Polyethylene (HDPE) have a good friction coefficient due to steel wax like surface. The sliding friction coefficient is approx. 0.2 as for steel has a coefficient of approx. 0.5. In comparison to this, steel on steel is approx. 0.5. Therefore, the abrasion is reduced to a minimum. The material is strong and yet flexible and is therefore resistant to stress cracking. Flexibility of the body, stability of the skid form and excellent dielectric insulation are some of the good characteristics of this material.
Installation notes
Insulator rings are normally installed with the following spacing between the rings:
- Pipe diameter up to 300 mm in 2.0 m support distance.
- Pipe diameter of more than 300 mm in 1.8 m support distance.
In particular cases, the ring distance may be modified after having examined the installation situation.
Load Capacity
|
Type |
Max. static load per ring |
|
PA/PE 1,2,3 and 4 |
400 kg |
|
PA/PE 6 |
500 kg |
|
AZ/AC |
400 kg |
| MA1 and MA2 |
1000 kg |
The load capacity data is applicable for a skid height of up to 75 mm. For skid heights above 75 mm, these values need to be multiplied with a factor of 0.75.
If you cannot determine the type according to our tables, please specify:
- the outer diameter of the carrier pipe (inclusive coating) in mm.
- the inner diameter of the casing pipe in mm.
APPROVED EGY-TEC. CO. Insulator Rings Type PA/PE
GENERAL INFORMATION
Pipe outer diameter from 25 mm to 178 mm
Type PA/PE insulators are available for a pipe outer diameter from 25 mm to 178 mm. They consist of two half shells. The nuts and bolts required for assembly are included in every delivery.
The type code indicates the carrier pipe O.D. in inch and the skid height in mm (e.g. PA/PE 4-55 = carrier pipe 4", skid height 55 mm).
The skid height is calculated from the difference in diameter of the carrier pipe and the casing. It is important to consider the actual dimensions, including coatings, rather than the nominal sizes.
Sectional drawing of segment. PA/PE 6 Ring with a total of 6 skids |
Sectional drawing of segment. PA/PE 1 to PA/PE 4 Ring with a total of 4 skids |
SELECTION TABLE
| Nominal width | Outer diameter in mm | Type | Skid height in mm including basic element | Width in mm | Number of segments | Number of skids | Bolts DIN 912 Qty/Size | ||
| mm | Inch | Min. | Max. | ||||||
| 25 | 1 | 30 | 38 | PA/PE 1-25
PA/PE 1-55 PA/PE 1-75 |
25
55 75 |
24 | 2 | 4 | 4 M 6 x 60 |
| 50 | 2 | 60 | 67 | PA/PE 2-25
PA/PE 2-55 PA/PE 2-75 |
25
55 75 |
100 | 2 | 4 | 4 M 6 x 60 |
| 80 | 3 | 89 | 96 | PA/PE 3-25
PA/PE 3-55 PA/PE 3-75 |
25
55 75 |
100 | 2 | 4 | 4 M 6 x 60 |
| 100 | 4 | 106 | 120 | PA/PE 4-25
PA/PE 4-55 PA/PE 4-75 |
25
55 75 |
130 | 2 | 4 | 4 M 6 x 60 |
| 150 | 6 | 160 | 178 | PA/PE 6-25
PA/PE 6-55 PA/PE 6-75 |
25
55 75 |
130 | 2 | 6 | 4 M 6 x 60 |