Testing and P-marking of fire suppression systems in engine compartments of heavy vehicles

P-marked fire suppression systems of heavy vehicles in accordance with SPCR 199 (certification rules) have been tested to stringent requirements demanded by the market.

The majority of fires in heavy vehicles start in the engine compartment, usually out of sight of the driver/operator. Once a fire has started it is important to detect, control and ultimately extinguish the fire as early as possible to avoid injuries, loss of lives, costs related to property damages and to secure business continuity. Further, an efficient fire detection and suppression system greatly enhances the time available for safe escape in the event of a fire.

Heavy vehicle applications are including but not limited to trucks, wheel loaders, tractors, mining machines and forestry machines. The certification rules SPCR 199 are derived from SPCR 183 and the test method SP method 4912 is used as a basis for the P-mark certification. The test is adaptable to simulate the suppression challenges of less enclosed engine compartments and can be without floor, ceiling or walls.

P-mark certification process

To obtain a P-mark in accordance with SPCR 199 (certification rules), the fire suppression system will need to fulfil the requirements in SP method 4912 in which the capacity of the system to extinguish different types of fires is evaluated.

A reliable test method

SP Method 4912 is carried out in a test enclosure where the fire-fighting performance of different suppression systems can be evaluated in a well-defined and objective way.  In the typified enclosure, different petrol-based fires are initiated that challenge the capability of the suppression system being tested. The test method includes realistic airflows and relevant fire scenarios. In addition, the test method is repeatable and reproducible. The test method also includes testing of re-ignition due to fuel spray of flammable liquid onto hot surfaces.

P-mark requirements for SPCR 199

  • Minimum rating of 7
  • Test 1 and Test 6 are compulsory
  • Test 5 or Test 7 are compulsory
  • 3 additional tests in addition to the compulsory ones must be passed
  • Re-ignition test shall be passed without any re-ignition
  • Tests shall be modified based on the engine compartment it is intended for. If an engine compartment has no floor a system should pass the tests without a floor in the test apparatus in order to be approved

Fire test scenario

Fire test category

Airflow (m³/s)

Fire sources used

Remarks

Test 1

High fire load

0

Pool fires, pool fires with fibreboards, diesel spray

P-mark– required

Test 2

Low fire load

0

Pool fires

Test 3

Hidden fire

0

Obstructed pool fires

Test 4

Class A-fire

0,5

Pool fires with wood crib

Test 5

High fire load

1,5

Pool fires, pool fires with fibreboards, diesel spray

P-mark – required (pass either 5 or 7)

Test 6

Low fire load

1,5

Pool fires

P-mark– required

Test 7

Hidden fire

1,5

Obstructed pool fires

P-mark – required (pass either 5 or 7)

Test 8

High fire load

3

Pool fires, pool fires with fibreboards, diesel spray

Test 9

Low fire load

3

Pool fires

Test 10

Hidden fire

3

Obstructed pool fires

Test 11

Hot surface
re-ignition

0

Dripping oil fire

P-mark– required