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# 1113.5 Discharge Capacity

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The minimum required discharge capacity of the pressure-relief device or fusible plug for a pressure vessel shall be determined in accordance with Equation 1113.5:

(Equation 1113.5)

*C=fDL*

Where:

C | = | Minimum required discharge capacity of the relief device expressed as mass flow of air, pounds per minute (kg/s). |

D | = | Outside diameter of vessel, feet (m). |

L | = | Length of vessel, feet (m). |

f | = | Factor dependent upon type of refrigerant from Table 1113.5. |

Where combustible materials are used within 20 ft (6096 mm) of a pressure vessel, the value of f shall be multiply by 2.5. Equation 1113.5 is based on fire conditions, other heat sources shall be calculated separately. Where one pressure-relief device or fusible plug is used to protect more than one pressure vessel, the required capacity shall be the sum of the capacity required for every pressure vessel. [ASHRAE 15:9.7.5]

**TABLE 1113.5 RELIEF DEVICES CAPACITY FACTOR*[ASHRAE 15:TABLE 9.7.5]**

REFRIGERANT | VALUE OF f |
---|---|

Where used on the lowside of a limited-charge cascade system: | |

R-23, R-170, R-744, R-1150, R-508A, R-508B | 1 |

R-13, R-13B1, R-503 | 2 |

R-14 | 2.5 |

Other applications: | |

R-718 | 0.2 |

R-717 | 0.5 |

R-11, R-32, R-113, R-123, R-142b, R-152a, R-290, R-600, R-600a, R-764 | 1 |

R-12, R-22, R-114, R-124, R-134a, R-401A, R401B, R-401C, R-405A, R-406A, R-407C, R-407D, R-407E, R-409A, R-409B, R-411A, R-411B, R-411C, R-412A, R-414A, R-414B, R-500, R-1270 | 1.6 |

R-143a, R-402B, R-403A, R-407A, R-408A, R-413A | 2 |

R-115, R-402A, R-403B, R-404A, R-407B, R-410A, R-410B, R-502, R-507A, R-509A | 2.5 |

* In accordance with Section 1102.2, ammonia refrigeration systems are not regulated by this chapter. R-717 (ammonia) is included in this table because the table is extracted from ASHRAE 15 and is not capable of being modified.

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