API Paragraph 3. The outstanding leg of the top. Calculated thickness plus corrosion allowance. Minimum thickness in accordance with API Buttwelded bottom plates. Suitable compacted fill material shall be provided to support the sump. For rubber lined tank, detail a3" of API , Figure shall be used. Cementitious grout, 1 inch 25 mm thick, shall be provided under the tank shell when the tank shell rests on a concrete ringwall.
When the Purchaser has specified a cone roof, the manufacturer may propose a clearly-labeled alternate dome roof or umbrella roof design if it is more economical.
When dome or umbrella roof is specified, the roof radius shall not be more than 1. The lap joints shall be. Buttwelded roof plates shall be furnished when specified on the tank drawings or data sheets or when roof is specified to have rubber lining. When the flange is in a horizontal plane, the bolt holes shall straddle the north-south centerlines indicated. When the flange is in a vertical plane, the bolt holes shall straddle the vertical centerline of the flange. Bolt hole orientation of flanges not specified above will be shown on the design drawings.
For sizes over NPS 60, flange dimensions will be shown on the drawings or data sheets. Manway flanges shall be in accordance with API , table 3.
Welds in segmented two-piece reinforcing pads on shell and conical roof shall be in the circumferential direction. The outside edge of reinforcing pads shall be ground or otherwise made reasonably smooth before welding to the tank. Purchaser will arrange for the supply and installation of anchor bolts or installation of anchor straps into the tank foundation. Tanks greater than. The ladder or spiral stairway may be of the tank manufacturer's standard design in accordance with 29CFR, Part , Subpart D requirements.
Spiral stairways on insulated tanks shall be furnished with an inside stringer; the treads shall not be welded directly to the shell. Unless otherwise shown on tank drawings, the walkway may be in the form of anti-skid bars welded to the roof plate with handrails provided on both sides of walkway.
The number of 24 inch mm inside diameter roof manholes as specified below:. One water drawoff sump with internal piping and shell nozzle. One ground-reading automatic level gauge with digital readout, float, and float guide wire assembly or when. A scaffold cable support for tanks over 18 feet 5. Four grounding earthing lugs. Free vents with stainless steel bug screen for atmospheric tanks or, when specified, pressure vacuum vent. Foam chambers and foam piping, when specified.
Tank heaters, internal piping, and shell nozzles, when specified, including all necessary nozzles, mounting. Shell nozzles and supports for side entering mixers, when specified. Emergency vent when required by Paragraph 2. Level alarms and level transmitters when specified, including all necessary nozzles, mounting brackets,. The top edge of all bulkhead plates shall be.
Roof shall be contact type to eliminate the presence of any air-vapor mixture under the deck. The wind girders shall be checked for drainage during. When the tank manufacturer has the tank filled as required with the testing fluid, he shall then run water into the wind girder with a hose. Within 15 minutes, the girder shall be checked to see if all the water has drained through the regularly supplied drain holes. The number of through-deck manholes for access to the inside of the tank as specified below:.
One manhole to be the minimum size necessary to service remove the roof drain assembly, but not less. The remainder shall be 24 inch size. One 8 inch mm diameter gauge hatch with self-closing non-sparking cover. Hatch cover shall be. One-ground reading automatic level gauge with digital readout, float, and float well, including all necessary.
Automatic floating roof vents. Rim vents under mechanical primary seal. A guide device to prevent rotation of the roof. A roof drain extending to a shell nozzle in form of articulated pipes unless hose pipe is specified on tank.
Emergency roof drains for double deck floating roof. Adjustable roof support legs for a high maintenance setting of 6 ft. The support legs shall be provided with bearing plate at bottom for internally lined tanks. A rolling ladder with self-leveling treads to permit access from the landing platform to the deck of the roof. One 20 inch mm diameter size manhole in each pontoon. Positive electric bond from the floating roof deck to the tank shell. Flexible foam seal or mechanical primary seals as appropriate based on tank content and size.
For epoxy. Secondary roof seals, in accordance with 40 CFR Part Foam chambers, shields, dams, and piping, when specified. Shell nozzles and supports for side-entering mixers, when specified. Level alarm and level transmitters when specified, including all necessary nozzles, mounting brackets,. The number of both fixed roof and floating roof manholes shall be per Subparagraph 3. Internal ladder to permit access from the fixed roof to the deck of the floating roof. One ground-reading automatic level gauge with digital readout float, and float well, including all necessary.
Free vents and circulation vent openings with stainless steel bug screens for atmospheric tanks per. API Paragraph H. The support legs shall be provided with bearing plate at bottom for internally lined tank. Positive electric bond from the roof deck to the tank shell.
Foam chambers and piping, when specified. Use of alternate materials per. API Table or is subject to prior, written approval by Purchaser. The gasket material shall be compatible with the stored product. When they occur the surface shall be conditioned to eliminate. For hillside nozzles, from face of flange to centerline of tank and from centerline of tank to centerline of. RP and the following requirements. For epoxy lined tanks, all internal welds shall be ground smooth and shall comply with NACE Standard weld.
Weld defects are not acceptable. All internal surfaces shall be seal welded, skip welds are not acceptable. All surfaces shall be free of weld spatter. Undercuts, pinholes, gouges and pits shall be filled with weld. Tank internals which require bolted connections shall be of a corrosion resistant materials. This also. Internals which cannot be easily blast cleaned and lined, such as piping elbows, long lengths of pipe, gauge.
When tank roof is not lined, a supported roof may be used if the roof rafters are not in contact with product. The contacting surfaces between column bases and tank bottom shall be lined with a suitable corrosion resistant alloy before the application of lining material. Long weld neck or slip on flanges are preferred. Weld neck nozzles may be used provided the internal.
Nozzle necks and pipes made from plates shall have all internal weld reinforcement ground smooth and flush. For rubber lined tanks, the minimum nozzle size shall be NPS 4. For epoxy lined tanks, the minimum nozzle size shall be NPS 3, unless otherwise indicated on tank. Nozzles smaller than NPS 3 shall be of a corrosion resistant alloy and shall project a minimum of 1 inch 25 mm into the tank. Threaded, carbon steel connections shall not be used for nozzles. Corrosion inhibitors and coatings shall not be applied to surfaces to be lined.
Carbon steel pad type studded outlet flanges may be used for nozzles sizes NPS 2 and larger for epoxy.
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