confined space solutions against concrete mixertruck drum hazards
Health & Safety
Blascon develops systems to contribute to health & safety for workers and concrete mixertruck drivers.
Products like DrumJet, ReadyJet and HopperLift are developed as prevention devices against human drum entry and so protecting workers against hazards of the confined space of concrete mixertruck drums.
Characteristics concrete mixertruck drums
- Confined space (steel barrel)
- Dissimilar shape (conical-cylindric-conical)
- angled about 10-15 degrees
- sloping, slippy, steel surface to stand on
- interior, double steel helix of Archimedes 50 cm high, vertically on drum wall
- manhole for drum-entrance in rotation surface of drum wall
- large charging opening at the drum backside covered with charge hopper
Respirable silica
Manual removal of concrete buildup from mixerdrum exceeds 2001 limits of NIOHS
Eight-hour TWA Respirable Silica Concentrations (mg/m3) for No control scenario.
| Sample Date | Employee ID | Sample Time (m) | Silica Percent | 8-Hour TWA Respirable Dust Concentration (mg/m3) | Silica PEL | 8-Hour TWA Respirable Dust Concentration (mg/m3) |
|---|---|---|---|---|---|---|
| 1/14/1999 | Emp. #1 | 90* | 12.2 | 2.79 | 0.70 | 0.34 |
| 1/14/1999 | Emp. #2 | 90* | 13.3 | 1.28 | 0.66 | 0.17 |
| 1/22/1999 | Emp. #2 | 85 | 11.5 | 1.16 | o.74 | 0.13 |
| 1/22/1999 | Emp. #1 | 114 | 13.1 | 1.29 | 0.66 | 0.17 |
| Geometric Mean Concentration | 1.52 | 0.189 | ||||
Abbreviations:
- mg/m3 – milligrams per cubic meter
- PEL – OSHA permissible exposure limit
Sample Time:
- Represents time working in concrete drum
- * – estimated tim working in contrete drum
Samples exceeding the OSHA PEL for respirable dust containing 1% quartz or more, are shown in bold type and samples exceeding the NIOSH REL of 0.05 mg/m3 for respirable silica are shown in bold type.
Source: NIOSH, Cincinatti; published may-31-2001
“evaluate workers exposure to respirable crystalline silica during interior cleaning of readymix concrete truck drums”
“evaluate workers exposure to respirable crystalline silica during interior cleaning of readymix concrete truck drums”
concrete mixerdrum = hazardous confined space
Blascon NL Office
Stationsstraat 5A
NL – 7575 BC Oldenzaal
NL – 7575 BC Oldenzaal
Phone: +31 625 307 807
Email: info@blascon.com
Blascon NL Delivery
Schelmaatstraat 21
7575 BC Oldenzaal
Blascon Deutschland
Büro und Lieferung
Twentestrasse 2
D – 48527 Nordhorn
Twentestrasse 2
D – 48527 Nordhorn
Telefon: +49 1520 6273 901
Email: info@blascon.com