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QUALITY
CONTROL MANUAL
Objective
This manual
establishes the procedures to be followed by company personnel
to insure the integrity of the products sold to our customers.
It is the responsibility of all personnel within this company
to adhere to and implement these procedures.
Raw
Material Control
All sheet
material used for inner vessel construction (shells and heads)
will be austenitic stainless steel and for the most part will
consist of materials conforming to SA-240. Suppliers will
provide material certification when necessary.
All tubing
and pipe used for inner vessel construction will be austenitic
stainless steel and for the most part will consist of materials
conforming to SA-312, SA-249 and SA-213. Suppliers will provide
material certifications when necessary.
Material
certifications (Mill Test Reports) will serve to periodically
verify conformance to the above, as well as satisfying the
requirements of the appropriate codes.
All other
steel sheet materials will be of good weldable quality and
domestic origin.
Receiving
Inspection
All incoming
material and parts will be inspected by the designated user
or use area for damage, defects and conformance to required
characteristics. Any rejections will be brought to the attention
of the management and returned. Consistently bad performance
by any supplier will be noted and reviewed by management personnel.
Design
Designs
for standard and custom products will be guided by ASME code
and DOT specifications where appropriate. All designs will
consider safety and possible misuse.
Designs
submitted by customers will be reviewed in the same light.
Any critical changes in customer requirements or specifications
will be documented.
Welding
Procedures
All welding
for ASME code and DOT work will be performed according to
qualified procedures and by qualified welders. Procedure and
performance qualifications will be kept on file. Welding for
"non-regulated" work will be performed essentially
as outlined in the procedures above.
Vacuum
Leak Testing
When the
design permits, all inner vessel assemblies will be vacuum
leak tested on every weld seam prior to the application of
insulation. A helium mass spectrometer leak detector will
be used for that test. After successfully passing that test
the inner vessel will be marked with an acceptance label.
No insulation will be applied to such inner vessels unless
the acceptance label is present. If an inner vessel fails
the test it will be re-worked accordingly and re-tested.
All finished
cryogenic container will be tested on every weld seam exposed
to vacuum. The inner vessel will be re-tested at this time.
Any container that fails that test will be re-worked accordingly,
and re-tested.
The sensitivity
of the leak detector will be verified every day, prior to
any testing.
Performance
Testing
Random
samples of standard containers will be selected and subjected
to evaporation rate tests to verify compliance with published
specifications. A sensitive flowmeter or scale will be used
for evaporation rate testing. Management personnel will determine
the test samples and direct the testing.
Final
Inspection
The fabricator
as well as the fitter will visually inspect every cryogenic
container for damage, defects and conformance to required
characteristics. Any rejections will be brought to the attention
of management personnel and channeled to the proper area for
correction.
A pressure
leak test (bubble test) will be performed on all fittings
and joints of all cryogenic vessels, new and repaired, when
the design permits. Any detected leaks will be repaired.
Random
Inspection
All fabrication
processes and finished products will be continually monitored.
Random inspections will be performed by management personnel
to insure conformance.
Labeling
& Literature
All finished
containers will have a label indicating the company name and
address. All standard containers will additionally be assigned
a serial/model number that will be type embossed on an aluminum
adhesive label or stamped into a metal nameplate.
Every
cryogenic container will be affixed with a warning/precaution
label. Every cryogenic container will be shipped with a pamphlet
explaining the hazards associated with handling cryogens and
proper handling procedures. When appropriate, cryogenic containers
will be affixed with a label designating the cryogen to be
contained. All
standard containers will be provided with operating instructions
when appropriate.
The fitting
department will perform all labeling functions. Providing
instructions is the responsibility of the fitting department.
The shipping department will have the responsibility to include
a safety pamphlet in every box containing cryogenic vessels.
Packaging
For domestic
surface shipments, all cryogenic containers (up to 24"
dia.) will be wrapped with kraft paper and bubble wrap, and
then packed in corrugated cardboard boxes with reinforced
corners. Boxes will be clearly labeled with "FRAGILE"
and "THIS END UP". Larger containers will be wrapped
with kraft paper and bubble wrap, and either crated or skidded.
For air
shipment of large containers, solid wooden boxes will be used,
either with or without cardboard boxes, depending upon size.
For ocean
shipment of large containers, solid wooden boxes will be used,
either with or without cardboard boxes, depending upon size.
When appropriate
any of the above may be affixed with a tip indicator according
to needs.
Traceability
& Records
All equipment sales will be logged according to product category
and the following information will also be entered: customer,
purchase order, serial number and date.
All sales,
purchase, design and code records will be maintained on file
indefinitely, but for a minimum period of not less than 7
years.
All equipment
repairs will be documented as to nature of problem, corrective
action and parts replaced. Appropriate forms will be used
for this purpose and kept on file with the job card.
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