Risks to Pipes due to Thermal Expansion

The Enemy of Roof Piping

Thermal Expansion/Contraction & Vibration

Thermal expansion/contraction can lead to premature and/or accelerated failure of pipe and pipe connections. While the following formulas and charts show how much pipes expand and contract – it takes only a small amount of change to impart a tremendous amount of force on the pipe. Vibration, including excessive pulsation, mechanical resonance or inadequate support can also result in pipe damage and roof damage.

Rooftop pipe supports protect roofs by allowing pipes to move without damaging the roof and are required by code. Wood and synthetic blocks (plastic, rubber, foam) can tear roofs and cause leaks as they move when pipes expand and contract. Wood blocks deteriorate over time, which can result in unsupported, collapsed pipes and are not compliant with industry standards or codes including the International Fuel Gas Code. Additionally, wind, rain and snow can move and damage pipes that are propped on wood or synthetic blocks.

The Formulas Provide the Reasoning

Charts Show the Data

… AND Photos Show The Reality!!!!

A Comment about Expansion Joints to address thermal effects:

The issue to consider with Expansion joints, is the amount pressure in the pipe. For instance, a standard DN200 Steel pipe can, using expansion bellows, create over 2.5 tons of force. (Walraven study)

.. with A Proven Engineering Answer!!!

Roller Supports

MAPA's EPDM Roller Roof Supports perform two duties.