COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

loading, chemical temperature and storage time duration. Tank piping flexible couplers shall be designed to allow 4% design movement. Movement shall be considered to occur both outward in tank radius and downward in fitting elevation from the neutral tank fitting placement. 11.10.2 The flexible connection is to be manufactured of the same material as the tank or a compatible material approved by the project engineer. If an elastomer flexible connection is used control bolts are required if recommended by the manufacturer. The flexible connection is to be designed for a minimum of 4% movement. The flexible connection is to be designed with 150# flange connections to allow for attachment to the tank and the piping system. The flexible connection is to be attached as close as possible to the tank to reduce stress. 12. Tank Attachments 12.1 Tank Attachments — Ultrasonic Level Indicator 12.1.1 a. The ultrasonic enclosure is to be an all plastic design with a NEMA 4X rating. The ultrasonic transducer is to have a 12" dead band and beam with a 20 ft range. The supply voltage can be 110, 220 VAC or 24 VDC. The connection to the tank is to be 2" NPT. The ultrasonic level indicator shall provide a visual display of liquid level in the tank showing gallonage in measurement of hundreds of gallons along with 4-20 mA output for other alarm or control systems as well as four independent contacts capable of handling 10 amps each. Each contact can be programmed to operate in different opening and closing methods (7 modes). Contacts can be used to control pumps, valves, alarms, etc. 12.2 Tank Attachments — Leak Detector Unit 12.2.1 The leak detector unit shall consist of a proximity sensor, a welded 2 in. fpt connection, a 2 in. bung plug with a % in strain relief, and an indicator box. The sensor is placed in the interstitial space between the primary and secondary tanks approximately 1 in above the tank bottom. The indicator box shall be Nema 4 rated and factory pre -wired for 110 VAC power. All connections shall be labeled to prevent errors in field installation. The indicator box will show a green light when power is on and the sensor is not detecting a liquid. The light is a push to test light allowing the operator to test for power outage or malfunction. If the green light goes out there are two possibilities. The green light does not come on when the button is pushed. This would indicate a lack of power to the unit or the light bulb is burned out. If the green light comes on when pushed, then a possible leak condition is indicated. 12.3 Level Indication 12.3.1 Sight Level Gage a. The sight level gage shall be constructed of flexible PVC tubing to allow for tank contraction and expansion due to loading and temperature changes. The level gage shall be connected to the tank at the top of the tank with lea. appropriate 3/4" fitting as described in section 11.1 or 11.2. and to a tee off of the drain / transition fitting. Each fitting can have valves installed for isolation or drainage purposes. 12.3.2 Manway and Fill Cap (Non -sealed) 12.3.2 Manways are available in an 18 in. vented or non -vented threaded design or hinged style (minimum opening diameter of 15 in.) and a 24 in. vented or non -vented threaded or hinged style (minimum opening diameter of 22 in.) on various tank sizes. COW manufacture's specification drawing for availability and position. nt.CEIVED 12.3.3 All caps and manways shall be constructed of polyethylene material. JUL 2 8 2014 ENVIRONMENTAL HEALTH DEPARTMENT