15.4. Scrapers
15.4.1. The tractor and scrapers should be joined by a safety
line when in operation.
15.4.2. Scraper bowls should be blocked while blades are being replaced.
15.4.3. Scrapers moving downhill should be left in gear.
15.5. Asphalt plants General provisions
15.5.1. Asphalt plants should be provided with:
safe means of access and working platforms; and
suitable fire-extinguishing appliances and materials.
15.5.2. Elevated platforms on asphalt spreaders should:
be protected by railings complying with the requirements of paragraphs 2.6.1 to 2.6.5; and
be provided with an access ladder complying with the relevant requirements of Chapter 4.
15.5.3. Wooden floors in front of the sprayers should be
covered with corrugated sheet metal.
15.5.4. The mixer elevator should be enclosed in a wooden
or sheet-metal shaft.
15.5.5. The shaft referred to in paragraph
15.5.4 should have
a window for observation, lubrication and maintenance.
15.5.6. Bitumen scoops should have solid covers.
15.5.7. Where necessary mixers should have the top ade- quately covered by netting.
15.5.8. The sprayer should be provided with a fire-resisting
shield.
15.5.9, The shield referred to in paragraph
15.5.8 should have
an observation window.