Low pressure steam lines
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Energy industry


Modern energy-efficient solutions require modern materials. RU-FLEX synthetic rubber-based foam insulation meets the high requirements of the energy industry. The insulation is durable and reliable, exceeding the service life of alternative materials, and has proven itself in the best possible way.

The ideal solution for low pressure steam lines is high temperature thermal insulation made of expanded synthetic rubber. UV-resistant, it can be used with or without protective coatings. The thermal conductivity is better than that of materials used previously.

To help choose the right RU-FLEX VENT thermal insulation thickness, we have prepared ready-made solutions (basic calculations).

Problem and solution

Calculation of insulation thickness according to normative heat flux density

Initial data

  • Heat transfer medium: water
  • tm = 130 ˚С – coolant temperature in the pipe;
  • tо = 25 ˚С – temperature in the shopping center.

According to SP (Construction Regulations) 61.13330.2012 "Thermal insulation of equipment and pipelines" paragraph 6.12: it is allowed to accept the nearest lower thickness of the thermal insulation layer in cases of calculation of temperature on the insulation surface and heat flux density norms, if the difference between the calculated and nominal thickness does not exceed 3 mm.

Without covering layer or with covering layer in different colours (PROM FORM):
Steel pipe diameter, mm Operating mode (24-hour or heating period) Design thickness of insulation, RU-FLEX VT, mm Recommended insulation thickness, RU-FLEX VT, mm
89 > 5000 hours
(209 days or more) 		46,88 Т50
≤ 5000 hours
(208 days or less) 		41,79 Т40
С покровным слоем (PROM POLYMER):
Steel pipe diameter, mm Operating mode (24-hour or heating period) Calculated insulation thickness, RU-FLEX VT PROM POLYMER, mm Recommended insulation thickness, RU-FLEX VT PROM POLYMER, mm
89 > 5000 hours
(209 days or more) 		46,88 Т50
≤ 5000 hours
(208 days or less) 		41,79 Т40

T-Designation of the tubular material.
Calculations made according to SP 61.13.330.2012 RF

Calculation of insulation thickness according to a given temperature on the insulation surface.

Initial data

  • Heat transfer medium: water
  • tm = 130 ˚С – coolant temperature in the pipe;
  • tо = 25 ˚С – temperature in the shopping center.

According to SP (Construction Regulations) 61.13330.2012, paragraph 6.7.1: for insulated surfaces located in working or service areas of rooms and containing substances with a temperature of 150 °C or lower, the surface temperature of the thermal insulation should not exceed 40 °C.

Without covering layer or with covering layer in different colours (PROM FORM):
Steel pipe diameter, mm Insulation surface temperature not exceeding ˚C Design thickness of insulation, RU-FLEX VT, mm Recommended insulation thickness, RU-FLEX VT, mm
89 40 22,52 Т25
С покровным слоем (PROM POLYMER):
Steel pipe diameter, mm Insulation surface temperature not exceeding ˚C Calculated insulation thickness, RU-FLEX VT PROM POLYMER, mm Recommended insulation thickness, RU-FLEX VT PROM POLYMER, mm
89 40 25,52 Т25

Calculations made according to SP 61.13.330.2012 RF

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