20
BA314001-en
8 Annex
MDG 29 Test Procedures (Extract)
The following text is an extract from the MDG 29 document (full title “
Guideline for the
management of diesel engine pollutants in underground environments”)
. The complete
document can be downloaded from:
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0018/225513/MDG-29-Guideline-for-the-
management-of-diesel-engine-pollutants-in-underground-environments.pdf
6.3.2 Procedures for Monitoring Raw Diesel Particulate Emissions
6.3.2.1 Standard Method
All diesel particulate testing shall be carried out using the following method unless the diesel
engine cannot be held in the load condition for 20 seconds in which case testing shall be carried
out in accordance with clause 6.3.2.2 below.
a Testing equipment shall comply with clause 8.2
Diesel Particulate Monitoring Equipment.
Note:
It is not possible to use the Bosch Smoke Meter for the above tests due to its inability to
measure over a 60 second sampling period.
b Exhaust sampling and analysis shall be carried out by a person competent to the satisfaction
of the mine mechanical engineer to carry out such test or by a licensed laboratory.
c The diesel engine shall be operated until the engine temperature stabilises. Exhaust
particulate sampling and analysis shall be performed when the diesel engine is at normal
operating temperature.
d The vehicle must be safely chocked and the vehicle brakes must be applied.
Important Safety Notice:
As engines must be tested in the load condition requiring the drive train to be engaged during
testing it is important the vehicle is adequately chocked or restrained and the brakes applied to
ensure it cannot “jump” or run away while the diesel engine is under throttle during the test.
e Place vehicle in third gear or other gear as specified by the equipment manufacturer to carry
out the test.
f Run the engine at idle speed.
g Insert sensor probe into the undiluted raw exhaust before any particulate treatment.
Note:
This may be downstream of catalytic converters and water based scrubbers but must be before
any particulate filter.
h Testing shall be carried out over a 60 second cycle and on the undiluted raw exhaust as
indicated in
Figure 1
below.
Notes:
1 It is important that the timing of the idle and full throttle settings is as accurate as possible.
To ensure good repeatability, it is advisable for the operator to practice the procedure
several times prior to collecting a sample.
2 Sampling should commence in the first idle period and continue until the final idle period.
3 Engines with a constant load, such as a diesel generator or pump should be analysed with
the load applied over the full 60 seconds.
I Start sampling timer on analyser.
j After 20 seconds have an operator quickly apply full throttle to engine (still in third gear) and
hold for 20 seconds.
k Quickly release throttle and allow engine to decay to idle while sampling for 20 seconds.
