Facility requirements for vessel liquid overfill protection.
(a) Each facility which receives cargo vapor from a tank barge which is fitted with overfill protection in accordance with 46 CFR 39.20-9(a) as its only means of overfill protection must provide a 120 volt, 20 amp explosion proof receptacle which meets:
(1) ANSI/NEMA WD6 (incorporated by reference; see § 154.106 );
(2) NFPA 70, National Electrical Code, Articles 410-57 and 501-12; incorporated by reference; see § 154.106 ); and
(b) Each facility that receives cargo vapor from a tank barge fitted with an intrinsically safe cargo tank level sensor system complying with 46 CFR 39.20-9(b) as its only means of overfill protection must have an overfill control panel on the dock capable of powering and receiving an alarm and shutdown signal from the cargo tank level sensor system that:
(1) Closes the remotely operated cargo vapor shutoff valve required by § 154.810(a) of this subpart and activates the emergency shutdown system required by § 154.550 of this part when:
(i) A tank overfill signal is received from the barge, or
(ii) Electrical continuity of the cargo tank level sensor system is lost;
(2) Activates an alarm which is audible and visible to barge personnel and facility personnel when a tank overfill signal, or an optional high level signal corresponding to a liquid level lower than the tank overfill sensor setting, is received from the barge;
(3) Has a means to electrically and mechanically test the alarms and automatic shutdown systems prior to transferring cargo to or ballasting the tank barge;
(4) Has suitable means, such as approved intrinsic safety barriers able to accept passive devices, to ensure that the overfill and optional alarm circuits on the barge side of the overfill control panel, including cabling, normally closed switches, and pin and sleeve connectors, are intrinsically safe;
(5) Is labeled with the maximum allowable inductance and capacitance to be connected to the panel, as specified by the equipment manufacturer; and
(6) Has a female connecting plug for the tank barge level sensor system with a 5 wire, 16 amp connector body meeting IEC 309-1/309-2 (incorporated by reference; see § 154.106) which is:
(i) Configured with pins S2 and R1 for the tank overfill sensor circuit, pin G connected to the cabling shield, and pins N and T3 reserved for an optional high level alarm connection;
(ii) Labeled “Connector for Barge Overflow Control System”; and
(iii) Connected to the overfill control panel by a shielded flexible cable.
[CGD 88-102, 55 FR 25429, June 21, 1990, as amended by USCG-2001-8661, 74 FR 45023, Aug. 31, 2009]
Title 33 published on 2012-07-01
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