Use and Care Manual

STORAGE TANK SPECIFICATIONS
3.2 APPEARANCE
3.3 CUT EDGES
3.4 DIMENSIONS AND TOLERANCES
3.4.1
3.4.2
3.5 PERFORMANCE REQUIREMENTS
The finished surface of the tank shall be free as commercially practicable from visu-
al defect such as foreign inclusions, air bubbles, pin holes, craters, crazing and
cracking that will impair the serviceability of the tank.
All edges cut out i.e., open top flanges, manways, shall be trimmed to have smooth
edges.
General - all dimensions will be taken with the tank in its proper, usable position and
unfilled. Tank dimensions will represent the exterior measurements.
Outside diameter -- The tolerance for the outside diameter including out of
roundness, shall be +/-3%.
The following performance requirements shall be conducted on samples taken
from the manway cut out area or where fittings are inserted in each tank
3.5.1 Low Temperature Impact
Low temperature impact is determined by using a 30 lb. Falling dart at -20
degrees F.
Wall thickness in. (mm)
Less than & including 0.25 in. (6.6 mm)
0.26 in. (6.6 mm) to & including 0.50 in. (12.9 mm)
0.51 in. (12.9 mm) to & including 0.75 in. (19.3 mm)
0.76 in. (19.3 mm) to & including 1.00 in. (25.4 mm)
ft-lb.
(J) to fail.
90 (122.0)
100 (135.5)
150 (203.2)
200 (271.0)
3.4.2 Shell wall and head thickness - The tolerance for thickness shall be
+/-20% of the design thickness. The total amount of an area on the low side
of the tolerance shall not exceed 10% of the total area and individual area
shall not exceed 1 ft. 2 (.09m2) in size.
3.5.2 Percent Gel - for crosslinked polyethylene
The percent gel level is determined by using the test method found in ASTM
D1998. The percent gel level for crosslinked tanks on the inside
0.125 in. (3.2mm) of the wall shall be a minimum of 60%.
3.5.3 Visual Inspection - The tank is visually inspected to determine such qualities
as are discussed in Section 3.2, Appearance.
4.0 MARKINGS
4.1 The tank is marked to identify the producer - Chem-Tainer, Inc., date
(month and year) of manufacture, capacity and serial number.
4.2 The proper caution and/or warning signs are affixed to the tank
4.3 Tank capacities should be based on total tank volume.
(3)