180 liter LN2 Supply Tank 1-3
Thermo Scientific
Section 1
Introduction
Responsibilities When
Filling Cylinders
To protect the inner pressure vessel from over pressurization, the unit
includes a safety pressure relief valve. The liquid cylinders are further
protected from over pressurization by a bursting disc that acts as a
secondary relief device. These devices meet the requirements of CGA
Pamphlet S-1.1 “Pressure Relief Device Standard - Part 1- Cylinders For
Compressed Gases.”
A back control regulator is used to build and maintain operator pressure
while assuring a no-loss operation under normal usage during gas
withdrawal service. The no loss portion of the regulator (referred to as the
economizer) allows gas withdrawal directly from the vapor space of the
cylinder until liquid cylinder head pressure is reduced to the normal
operating range. This important feature is useful whenever a liquid
cylinder has been inactive for a period of several days or whenever normal
heat leak may have created an increase in head pressure.
For precise regulation of the outlet gas, add a final line gas regulator at the
gas use connection. The operating pressure can be increased to the pressure
control valve setting (if necessary) by changing the regulator.
These MVE liquid cylinders provide a complete self-contained liquid or
gas supply system for industrial, laboratory, or hospital use.
MVE states below the responsibilities of the filler of any cryogenic liquid
cylinder:
1. The cylinder must be in a safe condition. The filler is responsible for
confirming that any cylinder to be filled is in its proper working
condition. This includes that:
•
It has an acceptable vacuum.
•
The relief system is in place and functioning.
•
There is no structural damage to the cylinder.
•
All warning labels are in place and legible.
2. Do not overfill the cylinder. The cylinders are not to be filled beyond
the recommended filling weight for the liquid being dispensed.
3. Dispense only to knowledgeable users. The filler must determine that
the user is knowledgeable about the general characteristics of the
product and the proper safety precautions for its use. Do not allow
customers to fill their own cylinders.
4. Dispose of cylinders properly. To eliminate the risk of injury from the
improper reuse of cryogenic (vacuum jacketed) cylinders, before
disposal, destroy the cylinder’s pressure retaining capability.
Cylinder Design
(continued)
