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Page 1

FIRE PROTECTION TANK SPECIFICATIONS REVISED 5/11/05
1





WATER TANK SPECIFICATIONS


14174 Hwy. 43, P.O. Box 506
Seneca, Missouri 64865 USA

Tel. 417-776-2500
Fax 417-776-2524





FIRE PROTECTION SPECIFICATIONS


BOLTED STEEL TANK
SECTION 13205



PART 1.00 – GENERAL

1.01 WORK INCLUDED

A. Tank Selection

The Engineer’s selection of factory-coated bolted steel tank construction for this facility has been
predicated upon the design criteria and construction methods specified. Deviations from the
specified design and construction details will not be permitted.

B. Drawings and Specifications

Construction shall be governed by the drawings and specifications showing general dimensions and
construction details. After approval by the Engineer of detailed erection drawings prepared by the
Manufacturer, there shall be no deviation from theses drawings and specifications except upon
written order or approval from the Engineer.

Three (3) copies of the shop drawings covering tank, anchors, accessories, appurtenances and
coatings provided shall be submitted in accordance with the “Submittals” and “Drawings and
Specification” sections.

C. Qualifications of Tank Manufacturer

The Tank Manufacturer shall be a specialist in the design, fabrication, and erection of factory-coated
bolted steel tanks. The manufacturer shall be quality certified, have an active API-Q1 and an ISO
9001 registration.

D. Design Criteria

Job Site Location PH of Product

Product to be Stored Temperature of Product

Specific Gravity Minimum Capacity (Gallons)

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FIRE PROTECTION TANK SPECIFICATIONS REVISED 5/11/05
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Diameter (Feet) Deck Live Load (25 PSF)

Maximum Depth (Feet) Wind Speed (100 MPH When completely
erected)

Minimum Freeboard (6 inches) Seismic Zone

Design Pressure


1.02 REFERENCES

AWWA D103 latest revision – Bolted steel tank fabrication and erection.

NFPA 22 version 1998 – Chapter 4 – Water tanks for private fire protection, factory-coated, bolted
steel tanks.


PART 2.0 – PRODUCTS

2.01 MATERIALS

A. Tank Structure

The materials, design, fabrication, and erection of the bolted steel tank shall conform to AWWA
D103 latest revision, to the Principles of Standard Specification 12B of the American Petroleum
Institute, or to USA Tank’s specifications which are de-rived from engineering principles, industry
experiences, and the aforementioned standards and specifications.


1. Steel


a. Sheet. Steel sheets shall conform to or shall be at least equal to hot-rolled quality per
ASTM A570 Grade 33 with a minimum yield strength of 33,000 psi. Minimum thickness
shall be 12 gauge (0.0972” minimum)


b. Plate. Steel plates shall conform to or at least be equal to the requirements of ASTM A36

with a minimum yield strength of 36,000 psi.


c. Rolled Structural Shapes. Rolled structural shapes shall conform to ASTM A36.

2. Bolts


a. Galvanized bolts, nuts, and washers used in tank joints shall be minimum ½ inch bolt
diameter and shall meet the minimum requirements of API 12B, Appendix A, except that
bolt heads and nuts may be other than square at the option of the tank manufacture.


b. Poly-capped bolt heads shall be used for additional corrosion protection.


c. Other bolts shall conform to or at least be equal to the latest revision of ASTM A307.

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FIRE PROTECTION TANK SPECIFICATIONS REVISED 5/11/05
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3. Gaskets


a. All bolted connections shall incorporate an EPDM (Buna N)* prefabricated gasket
minimum width 1 ¾”. A single piece double-punched gasket shall be used at vertical
seams which require two vertical rows of punching. Field caulking will be allowed when
joining a discontinuous gasket section and at certain joint connections. Neoprene backed
steel washers shall be provided at all bolts in contact with the stored liquid. No mastic
sealant shall be used as the primary method of sealing the tank.


Note – Use of Buna N for wastewater applications only.


4. Multiple Row Punching


All sheets in the shell of the tank that require multiple vertical row punching (double or triple)
must be in single stroke to insure proper alignment.


B. Appurtenances


1. The contractor shall furnish and install the appurtenances as shown on the contract drawings
and as specified below.


2. Unless otherwise noted, standard appurtenances shall be as follows per NFPA-22 and AWWA

D103 latest addition:


a. Hatch. The tank roof hatch shall have a curbed, upward opening 24” square. The curb
shall extend at least four inches above the tank. The hatch cover lip shall be hinged
and provisions made for locking. The hatch cover lip should extend for a distance of
two inches down on the outside of the curb.


b. Inlet and Outlet Connections. Inlet, outlet, and overflow connections shall conform to

the sizes and locations specified on the plan sheets. Overflow shall be at least one
pipe size larger than the fill line, and equipped with a weir box or concentric reducer
inlet.


c. Discharge pipe shall be sized by the user, but not less than 6” diameter.


d. Pump suction nozzles shall have anti-vortex plates at least twice the diameter of the

pipe.


e. Automatic fill piping shall be located at least 90 degrees from pump suction nozzle.


f. AWWA D103 latest edition wind design, seismic design, and live roof load shall be
utilized. Minimum live load on roof shall be 25 psf.


g. First stave ring, or embedded ring, shall be either 3/16” min., or designed for a

reduced net section allowable load.


h. Field welding is not permitted.

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FIRE PROTECTION TANK SPECIFICATIONS REVISED 5/11/05
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i. Vent. A mushroom-screened vent shall be furnished above maximum water level of

sufficient size to accommodate normal inlet and outlet flow. Roof vent with 3/8” min
screen is required. Venting area to be at least 150% of area of largest fill or discharge
pipe. The overflow pipe shall not be considered to be a tank vent. The vent shall be
so designed and constructed as to prevent the entrance of birds or animals.

j. Outside Tank Ladder. An outside OSHA ladder shall be furnished at the location
designated.


k. Inside wall mounted ladder.



l. Liquid Level Indicator. A liquid level indicator with stainless steel float and target

board shall be installed as detailed on the plans and to the tank manufacture’s
specifications.


m. Two (2) - 24” x 46” Flush Cleanout Door (24” Diameter Shell Manway). The flush

cleanout door (shell manway) shall conform to the sizes and locations specified on the
plan sheets.


n. Tanks subject to freezing shall be heated.


o. Tanks shall be periodically inspected, tested, and maintained in accordance with

NFPA-25.

C. Coating

All metal plates, supports, members, and miscellaneous parts, except bolts, certain accessories, and
appurtenances, shall be factory coated in accordance with the provisions of these specifications.
Field coating, except for touch-up will not be permitted.

Interior: Thermally cured epoxy Epicon 925.

Exterior: Amine Epoxy primer with baked acrylic finish coat or equal.


2.02 ACCEPTED TANK SUPPLIER

The steel tank and accessories furnished under this section shall be supplied by USA Tank Storage
Systems of Seneca, Missouri (417-776-2500).

PART 3.00 – EXECUTION

3.01 APPLICATION PROCEDURES FOR FACTORY COATING

A. Surface Preparation


1. Tank parts are thoroughly washed and rinsed to remove grease, oil, and foreign matter.

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FIRE PROTECTION TANK SPECIFICATIONS REVISED 5/11/05
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2. Parts are then immediately oven-dried.


3. Parts are grit-blasted to SSPC-SP10-63T (near white blast cleaning) to 1-2 mil profile.


4. All parts must be coated within 15 minutes after blasting, and no further processing other than
coating application shall be done.


B. Interior Coating


1. Thermally cured modified epoxy powder, Trico Bond EP by Columbian TecTank Company
(includes underside of the steel floor)


2. Electrostatic applications of FDA and NSF approved thermoset epoxy, 5.0 mil average

dry film thickness


C. Exterior Coating


1. Thermally cured modified epoxy powder, Trico-Bond EP and acrylic polyurethane by

Columbian Tec Tank Company.


2. First Coat is to be a powder application of modified epoxy Trico-Bond EP, 2.5 mils average
dry film thickness.


3. Second coat of acrylic polyurethane, 1.5 mil average dry film thickness.




3.02 DRYING AND SHIPPING COATED PARTS

A. Curing


1. Baking ovens to be used after each coat. Final coat is to be cured in bake oven for at least 15
minutes.


B. Preparation for Transport


1. Material to be marked or tagged with part number and order number for field assembly
requirements.


2. Tank material to be placed in racks or on pallets to facilitate transportation to jobsite. The

racks will also prevent scratching by erection crews.

3. Touch-up paint with instructions for application by erection personnel.


3.03 TANK FOUNDATION


1. The tank foundation shall be designed by the Owner’s Engineer to safely sustain the loads
from the tank.

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FIRE PROTECTION TANK SPECIFICATIONS REVISED 5/11/05
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2. Steel Bottom Tanks. The foundation shall be installed per AWWA D103 latest revision,
Section 11.4. Supplying and installing these foundation materials shall be the responsibility
of the customer.


3. The foundations shall be level with differential not exceeding +/- 1/8 inch in any 30-foot

circumference under the shell. The levelness on the circumference shall not vary more than
+/- ¼ inch from an established plane.


4. Concrete used for foundations shall not be less than 3000 psi strength. Except for tanks with

slab foundations, the steel bottom shall be crowned up at the center 1inch per 10 feet with a
minimum of 3” san cushion. 1” sand or ½” cane fiberboard shall be used between a slab and
steel bottom. Concrete ringwalls shall be a minimum of 10” wide and extend at least 30”
below grade, and 6” minimum above grade.


5. Soil reports are required for foundation designs.


Option:

Base setting stave placement and concrete shall be factory certified in accordance with the tank
manufacturer’s recommendations. The tank manufacturers shall certify the placement of the setting
stave.


3.04 SHIPPING

All plates, supports, members, and miscellaneous parts shall be packaged for shipment in such
manner to prevent abrasion or scratching of the finished coating.


3.05 ERECTION

Field erection of factory-coated bolted steel tanks shall be in strict accordance with the tank
manufacture’s recommendations. Particular care shall be exercised in handling and bolting of the
tank plates, supports, and members to avoid abrasion or scratching of the coating. Touch-up coating
shall be done in accordance with tank manufacturer’s recommendations where and as directed.


4.00 – TESTING


4.01 Testing

Following completion of erection how clean the tank shall be tested for liquid-tightness by filling the
tank to its overflow elevation. Any leaks disclosed by this tank test shall be corrected by the Erector
Contractor in accordance with the tank manufacturer’s recommendations. Water required for testing
shall be furnished at the time of erection completion by the Owner without charge.

Tanks shall be periodically inspected, tested, and maintained in accordance with NFPA-25.

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