With respect to Jim, neither #1 nor #2 grounds the container if the glass or plastic is, as usual, an insulator. Only placing a conductive rod contacting the liquid is effective.

 

Recognize that small liquid transfers, common in laboratory operations, are usually too slow and too little to generate much charge build up. Larger transfers (over 2 L) can easily generate ignitable discharges. Flowing streams through insulting tubing is a major problem.

 

Richard Palluzi

BE(ChE), ME(ChE), PE, CSP,FAIChE

 

Pilot plant and laboratory consulting, safety, design, reviews, and training

www.linkedin.com/in/richardppalluzillc/

www.pilotplants.us

 

Richard P Palluzi LLC

72 Summit Drive

Basking Ridge, NJ 07920

rpalluzi**At_Symbol_Here**verizon.net

908-285-3782

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of James Kaufman
Sent: Thursday, July 13, 2023 4:30 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Filling balloons with hydrogen gas

 

There are three major ways to ground glass and plastic containers:

 

1. Put a metal band around the container and run the ground wire off of it.

2. Rest the container on a grounded mat.

3. If chemical compatibility is not an issue, stick a metal rod with a ground wire on one end into the container.

 

It can also be a good idea to ground yourself.

 

PS.  LSI now has virtual lab inspections, safety program evaluations, document reviews, plus courses and seminars ... all virtual.  And, a complimentary,  updated version of our classic Laboratory Safety Guidelines is now available on our website ... https://www.labsafety.org/product/lab-safety-rules

 

James A. Kaufman, PhD

Founder/President Emeritus

 

The Laboratory Safety Institute (LSI)

A Non-profit Educational Organization

  for Safety in Science, Industry, and Education

192 Worcester Street, Natick, MA 01760-2252

(O) 508-647-1900   (F) 508-647-0062   (C) 508-574-6264  

Skype: labsafe; 508-401-7406  jkaufman**At_Symbol_Here**labsafety.org  www.labsafety.org 

 

Teach, Learn, and Practice Science Safely

 

 

 

 

On Thu, Jul 13, 2023 at 4:12 PM davivid <davivid**At_Symbol_Here**well.com> wrote:

Hi James

I hadn't heard that it was possible to ground/bond non-conductors. How
is this done?

Thank you
Dave Lane

On 7/13/23 6:45 AM, James Kaufman wrote:
> There are several ways to ground and bond plastic and glass containers
>
> Please contact me directly for more information ... Jim
>
>
> PS.  LSI now has virtual lab inspections, safety program evaluations,
> document reviews, plus courses and seminars ... all virtual.  And, a
> complimentary,  updated version of our classic Laboratory Safety Guidelines
> is now available on our website ...
> https://www.labsafety.org/product/lab-safety-rules
>
>
>
> *James A. Kaufman, PhD*
>
> Founder/President Emeritus
>
>
>
> *The Laboratory Safety Institute (LSI)*
>
> A Non-profit Educational Organization
>
>    for Safety in Science, Industry, and Education
>
> 192 Worcester Street, Natick, MA 01760-2252
>
> (O) 508-647-1900   (F) 508-647-0062   (C) 508-574-6264
>
> Skype: labsafe; 508-401-7406  jkaufman**At_Symbol_Here**labsafety.org  www.labsafety.org
>
>
> *Teach, Learn, and Practice Science Safely*
>
>
>
>
>
>
>
> On Wed, Jul 12, 2023 at 1:31 PM Alyssa Brand <abrand**At_Symbol_Here**lbl.gov> wrote:
>
>> Let me preface this with: I am no expert in the safe use of hydrogen gas.
>> But I wonder why a balloon would be used rather than a dedicated, regulated
>> gas line. My main concern with this would be the potential for ignition of
>> the hydrogen due to a static electricity discharge, and I would think that
>> using plastic components might not only increase the risk of a static
>> discharge occurring, but prevent the use of bonding and grounding. If I'm
>> entirely off base, feel free to ignore me. As I said, not an expert.
>>
>> Alyssa
>>
>> On Fri, Jul 7, 2023 at 10:54 AM davivid <davivid**At_Symbol_Here**well.com> wrote:
>>
>>> We do hydrogenations and hydrogenolysis in our lab in quantities of up
>>> to several moles. The equipment is assembled in a hood. Hydrogen is
>>> plumbed into the hood via 1/4" polyethylene tubing cable tied to the
>>> drop ceiling from tanks located elsewhere in the lab. The hydrogen
>>> regulator is set to deliver the lowest feasible pressure and the outlet
>>> valve set to deliver the lowest feasible flow.
>>>
>>> The assembled equipment is charged with the reactants and solvents then
>>> evacuated using a small diaphragm pump in the hood through a stopcock. A
>>> two-way stopcock can be used but a three-way stopcock is preferred as it
>>> does not require disconnection of the tubing from the system when
>>> switching between evacuation and fill. Hydrogen is then let into the
>>> evacuated system via the stopcock and fills the balloon. The hydrogen
>>> flow can be shut off at the system using the stopcock. If desired, the
>>> evacuation and fill procedure can be repeated multiple times to flush
>>> residual air from the system.
>>>
>>> We use mylar balloons from the Dollar Store as they are more capacious,
>>> stronger, less permeable, and more solvent resistant than rubber
>>> balloons. If you go this route you will need to fit the tubing several
>>> inches into the mouth of the balloon to reach past the internal valve.
>>>
>>> The attached photo shows the method we use to connect the balloons to
>>> the system. A gas inlet adapter is fitted with Tygon tubing which then
>>> connects to 1/4" polyethylene tubing. The joint between the two types of
>>> tubing is secured by two wraps of cable tie and sealed with grease. The
>>> tubing extends into the balloon to the point indicated by the arrow. The
>>> joint between the balloon and the 1/4" line is sealed with grease and
>>> fastened by wrapping several times with the ribbon from the balloon.
>>>
>>> Best regards
>>> Dave Lane
>>> Chief Science Officer
>>> Artisyn Laboratories
>>>
>>>
>>>
>>> On 7/6/23 12:27 PM, Laura Cunningham wrote:
>>>> Hi all,
>>>>
>>>> Does anyone have recommendations on how to *safely* fill a balloon with
>>> hydrogen? The hydrogen tank in this scenario is in an open lab, and the
>>> hydrogen filled balloon is for a hydrogenation reaction. The gas tank is
>>> located close enough to a fume hood that piping the hydrogen into the fume
>>> hood might be feasible. Wondering what other people’s experiences have been
>>> with this.
>>>>
>>>> Thanks,
>>>> Laura
>>>>
>>>> Sent from Proton Mail for iOS
>>>>
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