UL 80:2009 pdf download – Steel Tanks for Oil-Burner Fuels and Other Combustible Liquids.
24.1 Each tank, before painting, shall be tested by the manufacturer and proved tight against leakage by applying internal air pressure of not less than 5 psig (34 kPa). nor more than 7 psig (48 kPa). Observations for leakage are to be made in accordance with one of the following:
a) While the tank is subjected to the internal air pressure, apply a soap and water solution to all welds at joints, seams, pipe fittings, support brackets, lilting lugs, label holders, or similar locations where leakage is possible.
b) While the tank is subjected to the internal air pressure, completely submerge the tank in water.
24.2 The secondary containment or double bottom of each tank that is so constwcted, following testing of the primary lank per 24.1. shall be tested by the manufacturer and proved tight against leakage. Air pressure of 3— 7 psi (20.7 —48,3 kPa) shall be applied to the interstitial space and the steps of 24.1(a) and 24.1(b) shall be repeated.
Exception: Vacuum testing of the interstitial space to 5 in Hg (16.9 kPa) for at least 30 minutes or 25 in Hg (84.7 kPa) for at least 15 minutes without any loss of vacuum is an equivalent leak detection method.
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24.3 For primary tanks, an aerostatic pressure of 3 — 5 psig (20.7 — 34.4 kPa) shall be applied to the primary.
Exception: An aerostatic psessure of 3-7 psig (20.7 — 48.3 kPa) shall be permitted to be applied to cylindrical and obround tanks.
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24.4 CAUTION — Testing with air pressure is capable of resulting in a risk of injury to persons. Personnel are to be instructed in precautions that will reduce the risk of pressurizing the tank in excess of the specified test pressure. Testing shall only proceed when a means is provided with the test apparatus or the tank to reduce the risk of overpressurization of the tank.
24.5 When leaks are noted during the test, the tank shall be made tight by welding and shall be retested. Defects in welds shall be repaired by chipping or melting out from one or both sides of the joints, as required, and rewelding.
25 General Marking Information
25.1 Each tank shall be provided with a nameplate hxed to the tank in a permanent and legible manner where most likely visible after installation (such as top or head) or as otherwise indicated, but not on removable components (covers), around till openings, or in spill containers.
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25.2 Each tank shall be provided with all appropriate Engineering Markings in accordance with Section
26. using any one of the methods described in Marking Methods in accordance with Section 27.
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26 EngineerIng Markings
26.1 All tanks
26.1.1 Each tank nameplate shall be marked with the following manufacturer identification and general information as applicable: Note – Words within quotes” are the required verbatim markings.
a) The manufacturer’s name, trade name, trademark or other descriptive marking which identities the company responsible for the product and factory ID code when manufactured at more than one factory.
b) The rnanufactunng date in standard format (day/month/year). quarterly format (quarteryear) or a code that does not repeat in less than 20 years or require production record reference.
c) The manufacturers web address and phone number to obtain installation, inspection and maintenance instructions for compliance with 28.1.
d) The tank series, model, catalog number, or equivalent identification, and nominal capacity in gallons.
e) The tank basic design type “Primary Tank”, “Secondary Tank” or “Diked Tank”, as appropriate.
f) The optional construction type “Double Bottom” when in compliance with Section 8.
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26.1.2 Each tank shall be marked with the following critical assembly, installation, inspection, and cautionary information on or near the nameplate:
a) “IMPORTANT — Assemble and Install per NFPA 31 and Manufacturer Instructions” and a CAUTION” header followed by the following critical points:
1) “This Tank Is Intended for Stationary Use Only”
2) i’ilt Tank 1/4 lnch?foot (20.8 min’meter) Towards Bottom Opening”
3) “Do Not Reduce Vent Capacity Below 1-1/4 inch (35 mm) Pipe Size”
4) inspect Tank Periodically per Instructions”.