PRIMER COMPATIBILITY PROBLEM

A primer should not impair adhesion of a surface adhered coating. It must be stable with a melting temperature above 500°C. The steel element used should have a sufficiently pronounced re-entrant profile in accordance with BS 8202 Part 1 (1995) and AS 3784 Part 1 (1990).

As a result, manufacturers of spray applied fire resistive materials (SFRMs) or fire resistive coatings typically advocate that ‘no primer’ is better than ‘any primer’. The Vermitex® range is chemically compatible with most primers and our surface adhered coatings are not, in typical circumstances, affected by primers.

Register to read more ... »

STEEL ELEMENT DEPTH & WIDTH LIMITATION PROBLEM

LAF has tested a total of 27 steel members (inclusive of large steel plate sections) for various fire exposure times in accordance with the ISO 834 fire curve, without the aid of mechanical reinforcement. This is a unique achievement. 

Register to read more ... »

STEEL ELEMENT FORMING PART OF A FIRE SEPARATION PROBLEM

When structural steel elements are part of a Separating Element of Construction (partition, ceiling, etc.), care must be taken to ensure that the Insulation Criteria requirement (mandatory in AS 1530.4) or Separating Elements of Construction is not impeded. LAF have researched systems for upgrading and providing fire protection to structural steel elements which might penetrate fire walls in order to also satisfy the insulation criteria. For example the Vermitex® system may be used to upgrade purlins, I-beams and/or circular members penetrating through ‘party walls’ by spraying the steel member 25 mm thick for a distance of 300 mm.

Register to read more ... »

PRIMARY - SECONDARY MEMBER CONNECTIONS

A high temperature fire environment will affect a structure through the phenomenon of heat transfer. It is possible to quantify any heat transfer through analytical or numerical analysis. In materials that decompose, contain crystallised water, or equally, mass transfer is also involved during the heat transfer process. Sometimes in special cases like spalling, charring, composite polymers decomposition or intumescent coating expansion, combined heat and mass transfer analysis will be necessary. For our case, it will be sufficient to look at heat transfer. 

Register to read more ... »

RESTRAINED AND UNRESTRAINED STEEL MEMBERS

Generally a secondary beam of a structural frame which is connected to the main beams can be considered as a restrained member, regardless of the connection between the secondary beam and the main beam being pinned or a moment connection.

Register to read more ... »

INTERFACES BETWEEN CEMENTITIOUS SPRAY AND ALTERNATIVE FIRE PROTECTION PRODUCTS

The performance of our sprayed fire protection system when applied such that it adjoins an alternative fire protective product in the form of boards, intumescent paints, and fibrous materials, has been tested in accordance with standard and hydrocarbon fire exposure tests.

Register to read more ... »