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Bulk Trailer Unloading
Procedure for Sulfiding








Gaylord Chemical Company,
L.L.C. (GCC) is the world's
leading provider of Dimethyl
Sulfoxide (DMSO) solutions.
Beginning in the early
1960's ,GCC has been dedi-
cated to the development of
new uses for DMSO. In or-
der to meet customer-specific
needs, GCC has pioneered
the development of multiple
grades of DMSO, including
DMSO USP.

Gaylord Chemical's solutions
-based approach has contrib-
uted to the development and
growth of industries including
pharmaceuticals, hydro-
carbons, electronics, poly-
mers, coatings, agricultural
chemicals, and industrial
cleaners.

Gaylord Chemical's head-
quarters are located in Slidell,
Louisiana with manufactur-
ing, research, and develop-
ment facilities in nearby
Bogalusa, Louisiana. GCC
remains the only producer of
DMSO in the Western Hemi-
sphere.
DMSO PRODUCT INFORMATION BULLETIN
dimethyl sulfoxide solutions for industry
D M S O
Bulletin #104
Oct 2007
Introduction
Enviro-S
®
is the Gaylord trade name for dimethyl sulfoxide (DMSO). The purpose
of this procedure is to provide documentation that covers connecting, unloading
and venting Gaylord Chemical Company Enviro-S
®
tank trailers. If you have any
questions regarding this procedure contact the Customer Service Group, 800-426-
6620 or the Logistics Manager, 985-732-6311.
Procedure Safety
Dimethyl sulfoxide is a combustible liquid. Refer to MSDS for more information.

Personnel Protective and other Equipment recommended:
Hardhat
Safety Glasses
Safety Shoes
Protective Gloves
Additional equipment as required by the customer
Tools made of brass or non-sparking material are essential for connecting to the
trailer to avoid sparks, a potential ignition source.
Spotting the Trailer
The tractor should remain under trailer as the trailer landing gear is not designed to
support a full trailer. Insure that trailer and unloading equipment are adequately
grounded
before connecting and unloading. Provide access to maximum flow
valves (see Figure 1) located on both the liquid and vent lines. Depending on the
specific equipment used, maximum flow valves may be located under belly of
trailer or at end of trailer.
An emergency shut-off for the maximum flow valves is located at the front and
back of the trailer. The emergency shut-off can only be used to close the maxi-
mum flow valves. The emergency shut-off will close both maximum flow valves.
(See Figure 2 & 3).
Pressurizing the Trailer
Warning
: If the trailer will be pressurized for unloading, do not use air or oxy-
gen
.
Use only nitrogen.
Each trailer is fitted with a pressure relief valve. Gaylord trailers are equipped as
Gaylord Chemical Company, L.L.C.
Your Global Leader For DMSO Solutions!
P.O. Box 1209
Slidell, LA 70459-1209 USA
1.800.426.6620 Office
1.985.649.0068 Fax
info@gaylordchemical.com