3108F.3.2 Emergency Shutdown (ESD) Systems
Emergency shutdown systems are essential to oil spill and fire prevention. These systems may include, but are not limited to, ESD valves, shore isolation valves (SIVs), automatic pump shutdown, controls, actuators and alarms. The ESD systems shall conform to 2 CCR 2380 [8.3] and 33 CFR 154.550 [8.5], and provide:
- Remote actuation stations strategically located, so that ESD valve(s) may be shut within required times (N).
- Multiple actuation stations installed at strategic locations, so that one such station is located more than 100 ft from areas classified as Class I, Group D, Division 1 or 2 per the California Electrical Code [8.6]. Actuation stations shall be wired in parallel to achieve redundancy and arranged so that fire damage to one station will not disable the ESD system (N).
- Communications or control circuits to synchronize simultaneous closure of the shore isolation valves (SIVs) with the shutdown of loading pumps (N).
- A manual reset to restore the ESD system to an operational state after each initiation (N).
- An alarm to indicate failure of the primary power source (N).
- A secondary (emergency) power source (N).
- Periodic testing of the system (N/E).
- Fire proofing of motors and control-cables that are installed in areas classified as Class I, Group D, Division 1 or 2 per the California Electrical Code [8.6]. Fire proofing shall, at a minimum, comply with the recommendations in Section 6 of API RP 2218 [8.7] (N).
|Low (LC)||Flash Point1 ≥ 140°F||ISGOTT (Chapter 1), [8.2] —Nonvolatile||#6 Heavy Fuel Oil, residuals, bunker|
|High (HC)||Flash Point1 < 140°F||ISGOTT (Chapter 1), [8.2] —Volatile||Gasoline, JP4, crude oils|
- Flash Point is defined per ISGOTT [8.2].
|CLASS||STORED VOLUME (bbls)||FLOWING VOLUME (bbls)||CRITERIA (bbls)*|
|LOW||y||n||n||y||y||VFL ≥ VFH, and VT ≤ 1200|
|LOW||n||y||n||y||n||VSL + VFL ≤ 1200|
|MEDIUM||n||n||y||n||y||VSH + VFH ≤ 1200|
|MEDIUM||y||n||n||y||y||VFH> VFL, and VT≤ 1200|
|HIGH||n||y||n||y||n||VSL + VFL > 1200|
|HIGH||n||n||y||n||y||VSH + VFH > 1200|
y = yes
n = no
Stripped = product purged from pipeline following product transfer event.
VSL = stored volume of low volatility product
VSH = stored volume of high volatility product
VFL = volume of low volatility product flowing through transfer line during ESD.
VFH = volume of high volatility product flowing through transfer line during ESD.
VT = VSL + VSH + VFL + VFH = Total Volume (stored and flowing)
* Quantities are based on maximum flow rate, including simultaneous transfers.
ESD valves shall conform to the requirements in Section 3109F.5, as applicable, and the following:
- Be located near the dock manifold connection or loading arm (N/E).
- Have "Local" and "Remote" actuation capabilities (N).
Shore isolation valve(s) shall conform to the requirements in Section 3109F.5, as applicable, and the following:
- Be located onshore for each cargo pipeline. All SIVs shall be clustered together, for easy access (N).
- Be clearly identified together with associated pipeline (N/E).
- Have adequate lighting (N/E).
- Be provided with communications or control circuits to synchronize simultaneous closure of the ESD system with the shutdown of loading pumps (N).
- Have a manual reset to restore the SIV system to an operational state after each shut down event (N).
- Be provided with thermal expansion relief to accommodate expansion of the liquid when closed. Thermal relief piping shall be properly sized and routed around the SIV, into the downstream segment of the pipeline or into other containment (N/E).
- SIVs installed in pipelines carrying HC liquids, or at a MOT with a spill classification "Medium" or "High" (see Table 31F-1-1), shall be equipped with "Local" and "Remote" actuation capabilities. Local control SIVs may be motorized and/or operated manually (N).