(A) General.
(1) The plate steel employed throughout the equipment capsule shall meet or exceed the requirements for A.S.T.M. - 283, Grade D. The structurals shall meet or exceed the requirements for A-36. The design of all members shall be in accordance with the recommended practice for design as specified in the Manual of Steel Construction, published by the American Institute of Steel Construction, Inc.
(2) The equipment capsule shall be one completed unit when delivered. Field welding to complete the structure or attach the entrance tube will not be allowed. Steel plate or one-fourth inch minimum thickness will be used throughout the equipment capsule walls, top and bottom. Layout dimensions shown are for illustrative purposes and are not intended to limit an innovative design.
(3) The plate forming the top and bottom of the equipment capsule will be knuckle-radiused prior to assembly so as to form a lap joint with the wall. The average lap dimension will be one and one- half inches measured from the center of the internal weld to the center of the exterior continuously welded on the interior by hand and the exterior by machine to form an airtight seal.
(4) All equipment capsule joints shall be welded both inside and outside. Any ferrous metal device passing through the equipment capsule wall will be welded fully along its circumference or length on both sides of the capsule wall.
(5) Non-ferrous, PVC, cast iron or ductile iron piping passing through the equipment capsule wall will be housed in a suitable ferrous metal wall sleeve. The sleeve will be fully welded, as described herein. The wall sleeve will be complete with two each mechanical type joints each with adjustable glands and gaskets, both inside and outside of the equipment capsule. The piping passing through the capsule wall sleeve will be sealed tightly to assure completion of the quality control air tests, as stated below.
(6) The equipment capsule after installation of all components and completion of all penetrations shall be subject to an air test to assure the water-tight integrity of the weld system. A test pressure of three psi shall be maintained while a soap solution is applied to all welded joints on the exterior of the equipment capsule. The test pressure shall be measured by means of a tested and properly calibrated pressure gauge. Openings in the capsule shall be sealed against leakage.
(7) All welds found to be defective shall be repaired and the capsule shall be retested. Six certified copies of the report covering each test shall be prepared by the contractor and delivered to the engineer not less than ten days prior to shipment of the package pumping station, at the engineer's request.
(8) The equipment capsule shall be a vertical, elliptical capsule and have an end diameter of eight feet and six inches, tangent wall length of eight feet and six inches and an inside clear height of seven feet three inches. The tangent wall will be reinforced on the exterior only, on a maximum of 27- inch centers each way. The vertical reinforcement can be either three-inch channels or three-inch by two- inch box beams capped at the ends or a combination of both shapes. The horizontal reinforcement will be three-inch by two-inch angles.
(9) Four lifting plates of three-eighths inch minimum thickness shall be placed about the perimeter of the equipment capsule to facilitate the lifting and handling of the station. These lifting plates shall be so located as to insure proper balance of the entire pumping station during the setting operation.
(10) The equipment capsule entrance manway shall be Bilco Model MNB-50 prefabricated metal roof scuttle, rectangular in shape with a minimum clear inside opening of 30 inches by 54 inches. The scuttle cover shall be made of 11 gauge aluminum on the exterior with a three-inch beaded, vertical flange, neatly welded and sized to cover the scuttle riser section. The scuttle cover shall be insulated with a minimum of one-inch fiberglass insulation, covered and protected by an 18-gauge aluminum liner. The scuttle riser section shall be formed with an integral three and one-half inch flange with holes provided for securing the entrance manway to the angle framing on the top of the equipment capsule. The scuttle riser shall be provided with an integral metal cap-flashing of the same gauge and material as the riser, full welded at the corners for absolute weather-tightness.
(11) The scuttle shall be completely assembled with heavy pintle hinges, compression spring operators, enclosed in telescopic tubes and a full perimeter, extruded rubber draft seal. The cover shall be equipped with an automatic hold open arm complete with red vinyl grip handle to permit easy, one- hand release. When the scuttle cover is in the open position, the hold open arm will engage a lock-open device to prevent accidental closing of the scuttle cover. All entrance manway hardware shall be zinc plated with the exception of the entrance lock which shall be brass.
(12) The entrance manway shall be connected to the top of the equipment capsule by an attachment system. Neither factory, nor field welding, of the entrance manway will be permitted. The attachment system shall include, but not be limited to, ten and three-eighths inch diameter flange bolts with nuts and two flat washers each, bedding compound sealant, 4504 Scotch polyfoam, single side adhesive coated one-fourth-inch by three-inch gasket material and four each two-inch by one and one- half-inch by one-eighth-inch flange reinforcement cap angles.
(13) The entrance manway attachment system shall whenever possible be factory installed. If, because of shipping restrictions, the entrance manway cannot be factory installed, field attachment is permitted only if performed by factory personnel.
(14) The entrance manway shall be provided with keyed entry. The entry lock shall be flush mounted, in the scuttle riser, in position to be protected from the elements by the cover skirt. The lock will be of the pin tumbler type, dead bolt, with an inside safety release. Two keys will be provided on a key ring complete with the manufacturer's identification.
(15) Data sheets detailing the entrance manway and the attachment system are to be included in the manufacturer's equipment submittal.
(16) An all aluminum access ladder will be provided. The ladder will meet UL and OSHA approval under the Type I, Heavy Duty Specifications. The ladder will have one and one-fourth inch diameter, tempered, serrated rungs with three inches by one and one-eighth inch full I-beam side rails. The uppermost ends of the side rails will be protected by plastic caps bolted into place. The complete access ladder will be bolted into place, at a minimum of two points both top and bottom, so as to be easily removable to facilitate equipment maintenance.
(17) The equipment capsule will be complete with a sump to accommodate the automatic sump pump specified elsewhere herein. The sump shall be a minimum of 12 inches in diameter by eight inches deep and shall be fabricated of plate one-fourth inch minimum thickness. The sump shall be located so as to ensure proper and complete drainage of the equipment capsule floor.
(18) The equipment capsule walkway shall be covered with a Nyracord industrial safety matting. The mat shall be a heavy duty, one-half inch minimum thickness Nyracord compound (rubber blend with fiber reinforcement) of open slot design with a ribbed safety pattern (ribbed in two directions) to promote sure footing. The underside of the safety mat shall also be ribbed (in one direction only) to permit aeration and drainage. The safety mat shall not be glued to the floor surface.
(B) Corrosion protection.
(1) After all welding is entirely completed, all surfaces of the entire structure shall be sandblasted to a bright metal appearance, equal to commercial blast cleaning (SSPC-SP6), including a removal of all rust, mil scale and other foreign or interference materials and then thoroughly wiped clean with a dry, clean cloth prior to the application of the protective coating system.
(2) The protective coating shall take place immediately after surface preparation. The protective coating shall be Tnemec Series 66 Hi-Build Epoxoline two component, high solids, amide-cured epoxy system formulated for high build application having excellent chemical and corrosion resistant properties. The epoxy system shall be self priming and require no intermediate coatings. The protective coating shall provide in two applications a high film build over welds, joints, bolts and sharp angles. The protective coating shall be applied at a wet film mil thickness of no less than six mils per application to assure a dry film yield of no less than four mils per application, with a total dry mil thickness of eight mils.
(3) The station manufacturer shall furnish four 17-pound packaged magnesium anodes for cathodic protection. The anodes shall be buried equally spaced around the station and connected by heavy copper wire to lugs on the station provided for that purpose.
(Ord. passed 6-21-2011)