where they will be easy to find and use,” says
Tepid water service to emergency fixtures
is important, according to Halverson. In the
event of a chemical exposure, researchers
should remain under an emergency shower or
with their eyes within the flow of the eyewash
for 20 min. “As most of us shower at a warm
temperature, serving emergency fixtures with
incoming cold water would make it very difficult to remain within the water stream,” says
Halverson. The mixing valve for emergency
fixtures needs to be installed with a fail open
condition, allowing water at all times, even
if the valve isn’t mixing properly. “It’s more
important to have water than to have water at a
defined temperature,” continues Halverson.
According to Thomas, it’s important
that the temperature of water in emergency
fixtures be regulated. If the water coming out
of the fixture is too hot or too cold, it can
accelerate the damage done by chemicals.
“Another reason for using tepid water is to
encourage use,” says Thomas. If lab workers
know the water is a comfortable temperature, they’re more likely to use the fixture,
leading to increased safety.
Depending on the types of chemicals used,
some labs choose to have a shower floor
drain installed. This allows for easy cleanup
of a large volume of liquid. Floor drains can
be expensive because they require a trap
primer to be installed to prevent the trap
from drying out. This may require additional
maintenance, but due to safety regulations,
about 50% of lab clients choose this.
Halverson, on the other hand, argues that
floor drains are inappropriate for lab safety
with the exception of when they are required
to drain a specific piece of equipment, in
which case the drains need to be located
outside the path of travel and outside any
location where a chemical spill could occur.
“The majority of today’s facilities are designed without a waste treatment system, as
labs have implemented policies to collect all
chemicals within the lab and dispose of them
as regulated by the Environmental Protection Agency,” says Halverson. In the event
of a chemical spill, a lab with floor drains
would discharge uncontained chemicals into
the municipal sewer system.
Eye wash fixtures are typically installed
over sinks or with their own drain to allow
direct discharge to the waste system.
Lindsay Hock is editor of R&D Magazine
and Laboratory Design Newsletter.
Watson-Marlow Pumps Group has
launched its 120 cased peristaltic
pump range. The 120 pumps are
suited to single-use systems where
no contamination can be accepted.
The 120 pumps have been developed
to increase the low-flow capabilities
of the company’s product range for
applications in the biopharm sector.
The 120 features a 2,000:1 speed range (speed accuracy ±1%) and
a selection of USP Class VI tubes, delivering the flexibility and
purity vital to drug trials. The pumps measure 110 mm in width
and benefit from an intuitive interface, which makes them quick
and simple to setup and reduces the number of key presses and
potential errors. Simplicity is captured by the 114 pumphead, where
the spring-loaded flip-top track secures repetitive flow and pressure
performance. The 114 pumphead provides error-free tube changing
in seconds, with tubing clamped and tensioned automatically to
ensure repeatable performance. The illuminated numeric speed
display provides easy recording of operating parameters. A keypad
lock prevents accidental key presses, offering process security.
Watson-Marlow Pumps, www.watson-marlow.com
Compact Diaphragm Liquid Metering
KNF Neuberger Inc. introduced its enhanced
SIMDOS 10 line of diaphragm liquid metering pumps. Available with four head material
options, the line affords lab personnel with
simple operation, thanks to a user-friendly
display and adjustable transfer parameters
from a touch-control knob. The SIMDOS
10 FT version features a PTFE head, a PTFE-covered diaphragm and chemically resistant FFKM Kalrez valves,
for the transfer of aggressive chemicals. An optionally available
Chemraz-valve kit allows using the pump with highly concentrated
acids—nitric, sulphuric and hydrochloric—and solvents, such as
TFH, DMF, DMSO and MEK. Also available with heads in PP, PVDF
or stainless steel, each pump in the SIMDOS 10 line transfers liquids
with a flow rate of 1 to 100 mL/min, and dose volumes of 1 mL up
to 999 mL. SIMDOS 10 pumps are safe to run dry and are self-priming up to 9.8-ft water. Effective against pressures of up to 85 psig,
SIMDOS 10 pumps transfer viscous media up to 500 centistokes.
The integrated software permits transfer parameters to be modified
for a range of different viscosities at the touch of a button.
KNF Neuberger Inc., www.KNFusa.com
Emergency showers and eye wash stations at the Alexandria Innovation Center. Image: Leo A Daly
A narrow look at lab
continued from page 28