Rock Shields

Application

1) To protect the insulated surface of pipes or pipe sections during transportation and installation operations.

2) To protect an isolated surface of pipelines while it is covered with rocky or frozen ground, and also during operation from impacts of rocky soil in case of longitudinal (and lateral) movements of the underground pipeline.

3) For lining of operating pipelines strings:

  • at intersections with roads and railways, communications, pipelines of various purposes laid in a protective casing;
  • at air passages (over streams, ravines, etc.), laid in a protective casing;
  • at underwater transitions in areas laid down by alloying or dragging methods, as well as in areas ballasted by ring weights and cast-iron loads.

Material

A rock shield (SL) can be made of one or two layers completely impregnated with a hardened resin.
There can also be used a polymer shield (SLP) and a polymer reinforced polymer shield (SLPu), which are manufactured by unilateral lamination of a nonwoven synthetic material with polyethylene

Specification

No.ParameterSingle-layerDouble-layer
1 Weight 1 m2 (after 10 days of hardening), kg 3,3 ± 0,1 6,5 ± 0,2
2 Shield thickness, δ, mm 3,5 ± 0,5 7 ± 1
3 Impact strength, J:
1 rock shield:
- before impacting the pipeline insulation coating
- before impacting the rock sheet 2 rock shields:
- before impacting the pipeline insulation coating


45
42
95–100


125
120
190
4 Force at fracture in longitudinal and lateral directions (strips 50x200), kgf, min 160 240
5 The elongation at fracture, %, min 20 20
6 Perforation by sharp fractions of rock and frozen ground at a static vertical pressure of 0.85 kgf/cm2

The same with the combined effect of vertical and shearing loads (0.85 kgf/cm2, 250 displacement cycle)
No signs of through damage

No signs of damage
7 Resistance to abrasion (along the shield surface) by sharp fractions of rock and frozen ground at pressing load of 0.3 kgf/cm2:
- number of movement cycles
- reduction of the force at rupture(Δσ), %

600
15

600
15

Спасибо!

Ваша заявка отправлена.

В ближайшее время наши
менеджеры свяжуться с вами!