Current through Register Vol. 49, No. 13, September 23, 2024
Subpart
1.
Casing connections and caps 12 inches above
ground.
A connection or fitting 12 inches or more above the
established ground surface into the top or side of a casing must be constructed
to be weatherproof and insect proof. The connection, including a cap, cover,
electrical connection, water treatment connection, discharge piping, vent,
access pipe, or other connection to the casing must consist of:
A. a threaded connection;
B. a welded or solvent welded
connection;
C. a rubber expansion
sealer;
D. a bolted flange with
rubber gasket;
E. an overlapping
cap or cover with compression gasket;
F. an extension of the casing at least one
inch into the base of a pump; or
G.
a sanitary well seal with a one-piece top plate, compression gasket, and
noncorrodible draw bolts. The cap or seal must be equivalent to the casing in
weight and strength. If the well or boring is in a building that meets the
requirements in part 4725.2175, a two-piece top plate, compression gasket, and
noncorrodible draw bolts may be used.
Subp. 2.
Casing connections less than
12 inches above ground.
A connection to, or a fitting on a casing made less than 12
inches above the established ground surface must be constructed to be
watertight, vermin-proof, and provide complete clearance within the internal
diameter of the casing. The connection must not be submerged in water at the
time of installation. The connection must be made at or above the frost line.
The connection or fitting must consist of a:
A. threaded connection equivalent to the
material and threading standards of ASTM A53/A53M-04a, ASTM A589-96 (2001), API
Standard 5L-04, ASTM A312/A312M-04b, or ASTM F480-02;
B. welded connection for steel or stainless
steel casing where:
(1) the welded fitting
must:
(a) be made of forged or machined
metal; a cast-iron fitting is not allowed;
(b) be certified for use with pressure-rated
vessels or piping;
(c) be marked
with the design pressure rating and manufacturer;
(d) be made of metal compatible with the
casing material;
(e) have a design
pressure rating equal to or greater than the casing;
(f) fully integrate branch reinforcement and
maintain full casing strength by providing casing reinforcement, with
reinforcement tapering at the sides of the fitting;
(g) have a contour matching the curvature of
the casing; and
(h) be
self-aligning;
(2) the
installer of a welded fitting must:
(a)
complete the weld free of slag, inclusions, bubbles, voids, or other
imperfections;
(b) use a guide or
template for cutting the hole in the casing, or use a properly sized drilled
hole;
(c) install the welded
fitting in accordance with the manufacturers recommendations; and
(d) field-weld the fitting by holding the
welding rod in a vertical or horizontal position, or bench-weld the fitting
before field installation, with a welding rod as corrosion-resistant as the
casing;
C.
solvent welded connection for plastic casing equivalent to the standards of
ASTM F480-02, or part 4725.2550;
D.
bolted sleeve-type coupling meeting ANSI/AWWA Standard C219-01 where:
(1) the bolted sleeve-type coupling must:
(a) have a working pressure rating of at
least 150 pounds per square inch;
(b) have an interior coating that complies
with ANSI/NSF Standard 61-2003e if the coupling has an interior coating in
contact with water; and
(c) provide
for the casing or pipe to extend at least 2.5 inches into the
coupling;
(2) the
installer of a bolted sleeve-type coupling must:
(a) install the coupling in accordance with
ANSI/AWWA Standard C219-01; and
(b)
insert the casing or pipe ends at least 2.5 inches into the coupling;
or
E. pitless
adapter or pitless unit meeting the requirements of part 4725.4850, subpart 1.
A welded, solvent welded, or threaded coupling, adapter, or swaged fitting
meeting the material standards of part 4725.2350, 4725.2550, or 4725.6650 may
be used to connect a casing to a pitless adapter or unit.
Subp. 3.
Electrical connections.
Electrical wire must enter a casing, cap, cover, or pump base
a minimum of 12 inches above the established ground surface except for a well
or boring completed at-grade in accordance with part 4725.6850. Electrical
wires above the ground surface must be contained within a conduit or the
casing. The electrical wire connection through the casing, cap, cover, or pump
base must be made watertight and vermin-proof with a compression fitting,
gasket, or electrical conduit installed according to Minnesota Statutes,
section
326B.35, or
caulk meeting the standards of ANSI/NSF Standard 14-2003 or 61-2003e.
Statutory Authority: MS s
103I.101;
103I.111;
103I.205;
103I.221;
103I.301;
103I.401;
103I.451;
103I.501;
103I.525;
103I.531;
103I.535;
103I.541;
103I.621;
144.05;
144.12;
144.383;
157.04; 157.08; 157.09; 157.13
