API STD 2510:2001 pdf download
API STD 2510:2001 pdf download.Design and Construction of LPG Installations.
A more likely LPG incident, and in the context of this publication a more relevant one, is leakage from piping or other components attached to or near the vessel followed by ignition, a flash fire or vapor cloud explosion, and a continuing pooi fire and pressure (torch) fire.
5.1.1.2 With the exception of spacing, the design features discussed in this standard are intended to prevent a major incident. Spacing is intended to minimize both the potential for small leak ignition and the exposure risk presented to adjacent vessels, equipment, or installations in case ignition occurs. Spacing is not intended to provide protection from a major incident.
5.1.1.3 Safety analysis and dispersion modeling are useful tools in estimating setback distances to limit the exposure risk to adjacent facilities.
5.1.2 Minimum Distance Requirement
5.1.2.1 The minimum horizontal distance between the shell of a pressurized LPG tank and the line of adjoining property that may be developed shall be as shown in Table 1.
Where residences, public buildings, places of assembly, or industrial sites are located on adjacent property, greater distances or other supplemental protection shall be provided.
5.1.2.2 The minimum horizontal distance between the shells of pressurized LPG tanks or between the shell of a pressurized LPG tank and the shell of any other pressurized hazardous or flammable storage tank shall he as follows:
a. Between two spheres, between two vertical vessels, or between a sphere and a vertical vessel, 5 ft or half of the diameter of the larger vessel, whichever is greater.
b. Between two horizontal vessels, or between a horizontal vessel and a sphere or vertical vessel, 5 ft or three quarters of the diameter of the larger vessel, whichever is greater.
5.1.2.3 The minimum horizontal distance between the shell of a pressurized LPG tank and the shell of any other nonpressurized hazardous or flammable storage tank shall be the largest of the following with the exception noted after Item d:
a. If the other storage is refrigerated, three quarters of the greater diameter.
b. If the other storage is in atmospheric tanks and is designed to contain material with a flash point of 100°F or less. one diameter of the larger tank.
c. If the other storage is in atmospheric tanks and is designed to contain material with a flash point greater than 100°F, half the diameter of the larger tank.
d. 100 ft.
The minimum horizontal distance between shells need not exceed 200 ft.
5.1.2.4 The minimum horizontal distance between the shell of an LPG tank and a regularly occupied building shall be as follows:
a. If the building is used for the control of the storage facility, 50 ft.
b. If the building is used solely for other purposes (unrelated to control of the storage facility), 100 ft.
c. Compliance with API 752 may be used in lieu of the requirements in paragraph a and b.
5.1.2.5 The minimum horizontal distance between the shell of an LPG tank and facilities or equipment not covered in 5.1.2.1 through 5.1.2.4 shall be as Ibllows:
a. For process vessels, 50 ft.
b. For flares or other equipment containing exposed flames, 100 ft.
c. For other fired equipment, including process furnaces and utility boilers, 50 ft.
d. For rotating equipment, 50 ft; except for pumps taking suction from the LPG tanks, 10 ft.
e. For overhead power transmission lines and electric substations, 50 ft. In addition, siting shall be such that a break in the overhead lines shall not cause the exposed ends to fall on any vessel or equipment.
f. For loading and unloading facilities for trucks and railcars, 50 ft.
g. For navigable waterways, docks, and piers, 100 ft.
h. For stationary internal combustion engines. 50 ft.
5.1.2.6 The minimum horizontal distance between the shell of an LPG tank and the edge of a spill containment area for flammable or combustible liquid storage tanks shall he 10 ft.
Note: If the spill containment is by the use of dikes or walls, the edge of the spill containment area for the purpose of spacing is defined as the centerline of the dike or wall. If the spill containment is by sloping, grading, or channels, the edge of the spill containment area for the purpose of spacing is defined as the outer edge of the wetted area at the design incident for the spill containment faciliy.
