From: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM>
Subject: Re: [DCHAS-L] Ventilation calculator for chemical spills?
Date: Thu, 22 Oct 2015 12:15:11 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 7B39633B01F4EE42A269E983C42F5A480637345C**At_Symbol_Here**SULFATE.fsidomain.local

Hi Boitumelo Kgarebe!


Unless things have changed recently, there is nothing in the way of a national standard prohibiting this "no drain" setup for a safety shower in the US either.  I have seen such safety showers all over in the US.  Since much plumbing is covered by local codes here, it may be that many localities require drains for such units, many H&S people who can influence their own building specifications also probably opt for drains as well.


Why is this?  Many bad things can happen with a no-drain system, including damage to the floor and also to the floor beneath if there is one.  There have even been discussions before among CHAS colleagues about people who have spilled acid on themselves NOT using a shower because of fear they will disrupt others and damage the building.  We work a lot with architects and lab supervisors here because of the many safety containment products we make, and my personal position would be to always use a drain with such a unit.  Training on how these units work and how to use them are also critical!


So much for the self-evident.


Very Truly Yours,


Dr. Bob Haugen

Director of Product and Technology Development

Flow Sciences Inc.

2025 Mercantile Drive

Leland, NC 28451


Phone 910 332 4878


From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**] On Behalf Of Boitumelo Kgarebe
Sent: Thursday, October 22, 2015 3:48 AM
Subject: Re: [DCHAS-L] Ventilation calculator for chemical spills?



Can anyone pls assist me urgently. I head an Occupational Health Analytical Laboratory facility in Johannesburg. We are about to take over a newly renovated organic chemistry lab. An emergency shower has been installed, but with no drainage. We are being told that that is the norm in South Africa.


Apparently, the General Safety Regulations framed under the OHS Act, Regulation 3 (9) states that "Where an employee at a workplace is exposed or can be exposed to a potential hazard of injury to or absorption through the skin as a result of sudden contact with a large amount of toxic, corrosive, high risk or similar hazardous substance, the employer concerned shall make sure that there is a fast-reacting deluge-shower with clean water or a similar facility in the immediate vicinity of the workplace of such employee and that the employee is trained in the use thereof." There is no definition of large amount and again no reference to drainage to sewer (or otherwise).

I disagree since this would mean that in the event (hopefully rare) of an accident, an employee will wash off the contaminant and still "stand" in the contaminated water. How are your emergency showers configured?



Boitumelo Kgarebe

National Institute for Occupational Health

Johannesburg, South Africa 


On Tue, Oct 20, 2015 at 8:50 PM, Secretary, ACS Division of Chemical Health and Safety <secretary**At_Symbol_Here**> wrote:

From: Mary.Biersack**At_Symbol_Here**

I am looking for a good industrial hygiene resource for calculating the evaporation rates of a spilled chemical and the amount of ventilation required to keep the chemical spill below the specific chemicals OSHA PEL (ppm).  Does anyone know of any good computer software programs or calculators?


Mary Biersack
Lab Safety and Chemical Hygiene Specialist
West Pharmaceutical Services, Inc.
P: +1 610-594-3278
530 Herman O. West Drive | Exton, PA 19341 | United States

Find West on Twitter and LinkedIn.

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