Code of Massachusetts Regulations
980 CMR - ENERGY FACILITIES SITING COUNCIL
Title 980 CMR 10.00 - Siting Of Intrastate Liquefied Natural Gas Storage
Section 10.03 - Performance Standards for Determining Site Sizes
Universal Citation: 980 MA Code of Regs 980.10
Current through Register 1531, September 27, 2024
(1) Thermal Radiation Protection.
(a) The area of the
property must be sufficiently large to provide a thermal protection
zone.
(b) Within the protection
zone, the dike constructed to impound the LNG may not be located closer to
targets Usted in 980 CMR 10.03(l)(d) than distance "d".
(c) The protection distance "d" is measured
as shown in FIGURE 4 along the line (PT) in a vertical plane defined by the
points (T) and (D), where
(T) is a point at the top of the target;
(D) is a point closest to (T) on the top inside edge of the dike;
(PD) is a line in the vertical plane which intersects (D) at an angle of 45° above horizontal;
(w) is the inside distance across the top of the impounding space measured normal to (PD); and
(P) is located where (PT) and (PD) intersect at an angle of 90° or where (PD) equals 3 (w), whichever results in the shortest length of (PD).
F. GURE 4
SEE TEXT
(d) The length of a protection distance in
feet may not be less than the distance "d" determined in accordance with the
following formula for the target concerned, when "A" equals inside area in
square feet measured across the top of the impounding space:
| TARGET | PROTECTION DISTANCE |
| 1. Any point in an area outside the property line which is not zoned for industrial use. | d = 3.6 (A)0.5 |
| 2. Any point in an area outside the property line which is zoned for industrial use. | d = 2(A)0.5 |
(e)
For any facility which depends upon surrounding industrially zoned land for
compliance as provided in 980 CMR 10.03(l)(d) the applicant must conduct a
safety consultation session with the local planning board and with each owner
of land in the affected portions of the suiTOunding industrial zone. Prior to
conducting safety consultations, the applicant must confer with the Department
of Public Utilities on the scope and content of the safety consultation
sessions. The applicant must give notice to the Department of Public Utilities
that such consultations have been completed prior to the transfer of any LNG to
the site or processing of LNG at the site.
(f) The method described in 980 CMR 10.03(c)
and 10.03(d) shall be the accepted method of calculation of the thermal
protection distance. Any interested party may request a rulemaking procedure to
qualify an additional method of calculation. No facility may be evaluated using
a new method of calculation unless the method has been submitted to the Council
six months prior to the filing of the forecast containing the facility
proposal, and unless that method is approved and accepted by the Council prior
to the filing of the forecast containing the facility proposal.
(2) Vapor Dispersion Exclusion Zone.
(a) Zone
Requirement. Each LNG facility shall be designed to prevent flammable vapor
from a design spill as defined in 980 CMR 10.03(2)(b) from crossing the
property line. The boundary of the vapor dispersion exclusion zone will be
determined by the minimum exclusion distance computed in accordance with this
section. The vapor dispersion exclusion zone will be determined by a standard
at the property line of an average gas to air concentration of no more than 2.0
percent. The boundary or estimated dispersion distance (D) is measured radially
from the inside edge of the impounding system along the ground contour to the
vapor dispersion zone boundary.
(b)
Design Accidents for the Calculation of Dispersion Distance (D) hi computing
dispersion distance (D) under 980 CMR 10.03(2)(d), the following applies:
1. The value of (Dj) is the lesser of the
values resulting from the following vapor generation conditions:
a. Vapor generation rate equals the maximum
constant rate of discharge from failed transfer piping having the greatest
overall flow capacity.
b. Vapor
generation from sudden contact of LNG with 100% of the impounding system floor
area and 50% of all liquid impounding surfaces which the liquid could contact,
including the walls and roof of the component served, plus flash vaporization
from the maximum constant rate of discharge from failed transfer piping having
the greatest overall flow capacity.
2. The value of (Dj) is based on the
following applicable conditions:
a. For all
classes of impounding a sudden total spill of the maximum contents of the
largest component served, with vapor generation resulting from liquid contact
with surfaces of the impounding system and outer component surfaces exposed to
the final static fluid configuration and flash vaporization from the contents
of the component served.
3. The distance (D) equals the greater of
(D,) or (Dj).
(c) Vapor
Flow Rate.
1. The maximum time (t) required
for the release of liquid from a component served in a sudden total spill is
determined in accordance with the following equation:
(t) = 9(h/G)0.5
where (t) is the time, (h) is the difference between the maximum height in feet of the contained liquid and the equilibrium height of liquid when impounded, and (G) is the acceleration of gravity.
2. Impounding and other surfaces
which may be contacted by LNG under conditions described in 980 CMR 10.03(2)(b)
l. and 10.03(2)(b)2. may be insulated. The heat transfer value and application
technique of the proposed insulating material must be satisfactory to the
Department of Public Utilities. The boiling rate of LNG on which (D) is based,
is determined by multiplying .9 times the weighted average value of (KPC)0.5
determined from eight representative experimental tests on the contact surfaces
in the impounding space, where
K = thermal conductivity in (BTU/(HR) (ft) (F°)),
P = density in (1 lb/ft3), and
C = heat capacity in (BTU/(lb) (F°)). The test conditions should vary in terms of the spills' elevation, separate velocity, and quantity. 3. Dispersion distance (D) is determined on the basis that vapor detention space does not exceed:
a. For
conditions described in 980 CMR 10.03(2)(b) l.a. of the preceding section, all
space provided for liquid impoundment and vapor detention outside the component
served; and
b. For conditions
described in 980 CMR 10.03(2)(b)2.a. all space provided for liquid impoundment
and vapor detention outside the component served less the volume of the liquid
that would have entered the impounding space when generating vapor escapes the
vapor detention barriers, assuming liquid to be entering the impounding space
outside the component served at a constant rate over the time period prescribed
by 980 CMR 10.03(2)(c) l.
(d) Calculationof Vapor Dispersion Distance.
The boundary or estimated dispersion distance (D) must be calculated in
accordance with the applicable parts of Appendices A, B, and C of the
publication, "Evaluation of LNG Vapor Control Methods" (American Gas
Association, Arlington, VA., 1974), subject to the following parameters and
other requirements of 980 CMR 10.03:
1.
Average gas concentration in air is 2.0% by volume.
2. Wind speed (w) is 5.0 miles per
hour.
3. Source height (H) is
zero.
4. Source width (L) is
A0.5, where A is the inside area measured across the
top of the impounding space, as in 10.03(l)(d).
5. The Gifford-Pasquill atmospheric stability
category is F (moderately stable).
6. The temperature of the impounding and
storage vessel surface is 47°C.
(e) Additional Methods of Calculation. The
method reference in 980 CMR 10.03(2)(d) shall be the accepted method of
calculation of the vapor dispersion distance. Any interested party may request
a rulemaking procedure to qualify an additional method of calculation for vapor
dispersion. No facility may be evaluated using a new method of calculation
unless that method has been submitted to the Council six months prior to the
filing of the forecast containing the facility proposal, and unless that method
is approved and accepted by the Council prior to the filing of the forecast
containing the facility proposal.
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