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Subpart V

— Standards of Performance for the Phosphate Fertilizer Industry: Diammonium Phosphate Plants

Contents

§60.220 Applicability and designation of affected facility. §60.221 Definitions. §60.222 Standard for fluorides. §60.223 Monitoring of operations. §60.224 Test methods and procedures. §60.220 Applicability and designation of affected facility. (a) The affected facility to which the provisions of this subpart apply is each granular diammonium phosphate plant having a design capacity of more than 15 tons of equivalent P 2 O 5 feed per calendar day. For the purpose of this subpart, the affected facility includes any combination of: reactors, granulators, dryers, coolers, screens, and mills. (b) Any facility under paragraph (a) of this section tha t commences construction or modification after October 22, 1974, is subject to the requirements of this subpart. §60.221 Definitions. As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of thi s part.P age 2 of 7

(a) Granular diammonium phosphate plant means any plant manufacturing granular diammonium phosphate by reacting phosphoric acid with ammonia. (b) Total fluorides means elemental fluorine and all fluoride compounds as measured by reference methods specified in §60.224, or equivalent or alternative methods. (c) Equivalent P 2 O 5 feed means the quantity of phosphorus, expressed as phosphorus pentoxide, fed to the process. §60.222 Standard for fluorides. (a) On and after the date on which the performance test required to be conducted by §60.8 is completed, no owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility any gases which contain total fluorides in excess of 30 g/megagram (Mg) of equivalent P 2 O 5 feed (0.060 lb/ton). §60.223 Monitoring of operations. (a) The owner or operator of any granular diammonium phosphate plant subject to the provisions of this subpart shall install, calibrate, maintain, and operate a f low monitoring

device which can be used to determine the mass flow of phosphorus

- bearing feed material to the process. The flow monitoring device shall have an accuracy of ±5 percent over its operating range.P age 3 of 7

(b) The owner or operator of any granular diammonium phosphate plant shall maintain a daily record of equivalent P 2 O 5 feed by first determining the total mass rate in Mg/hr of phosphorus

- bearing feed using a flow monitoring device meeting the requirements of paragraph (a) of this section and then by proceeding according to §60.224(b)(3). (c) Except as specified in paragraph (d) of this section, T t he owner or operator of any granular diammonium phosphate plant subject to the provisions of this subpart shall install, calibrate, maintain, and operate a monitoring device which continuously measures and permanently records the total pressure drop across the scrubbing system. The monitoring device shall have an accuracy of ±5 percent over its operating range. (d) A n y affected facility as defined in § 60.2 20 ( a ) that commences construction, modification, or reconstruction after [ d ate of p ublication of the final rule in the Federal Register ] is subject to the requirements of this paragraph instead of the requirements in paragraph (c) of this section

. If an absorber is used to comply with § 6 0

. 222, then the owner or operator shall continuously monitor pressure drop through the absorber and meet

the requirements specified in paragraphs (d) ( 1 ) through (d) ( 4 )

of this section. (1) The owner or operator sha ll i nstall, calibrate, maintain, and operate a continuous monitoring system (CMS) thatP age 4 of 7

continuously measures and permanently records the pressure at the gas stream inlet and outlet of the absorber. T he pressure at the gas stream inlet of the absorber may b e measured using amperage on the blower if a correlation between pressure and amperage is established

. (2) The CMS must have an accuracy of ± 5 percent over the normal range measured or 0.12 kilopascals (0.5 inches of water column), whichever is greater. ( 3) The owner or operator shall establish an allowable range for the pressure drop through the absorber. The allowable range is ±20 percent of the arithmetic average of the three test runs conducted during the performance test required in § 60.8.

The Admini strator retains the right to reduce the ±20 percent adjustment to the baseline average values of operating ranges in those instances where performance test results indicate that a source's level of emissions is near the value of an applicable

emissions sta ndard

. However, the adjustment must not be reduced to less than ±10 percent under any instance. (4) The owner or operator shall demonstrate continuous compliance by maintaining the daily average pressure drop through the absorber to within the allowable range established in paragraph (d)(3) of this section. The daily average pressure drop through the absorber for each operating day shall be

calculated using the data recorded by the monitoring system. IfP age 5 of 7

the emissions unit operation is continuous, the oper ating day is

a 24

- hour period. If the emissions unit operation is not continuous, the operating day is the total number of hours of control device operation per 24

- hour period. Valid data points must be available for 75 percent of the operating hours in an operating day to compute the daily average. §60.224 Test methods and procedures. (a) In conducting the performance tests required in §60.8, the owner or operator shall use as reference methods and procedures the test methods in appendix A of this part or other methods and procedures as specified in this section, except as provided in §60.8(b). (b) The owner or operator shall determine compliance with the total fluorides standard in §60.222 as follows: (1) The emission rate (E) of total fluorides shall be

c omputed for each run using the following equation:

where:

E = emission rate of total fluorides, g/Mg (lb/ton) of

equivalent P 2 O 5 feed. C si = concentration of total fluorides from emission point

“i,” mg/dscm (gr/dscf). Q sdi = volumetric flow rate of e ffluent gas from emission

point “i,” dscm/hr (dscf/hr).P age 6 of 7

N = n umber of emission points associated with the

affected facility. P = equivalent P 2 O 5 feed rate, Mg/hr (ton/hr). K = conversion factor, 1000 mg/g (7,000 gr/lb). (2) Method 13A or 13B shall be used to determine the total fluorides concentration (C si ) and volumetric flow rate (Q sdi ) of the effluent gas from each of the emission points. The sampling time and sample volume for each run shall be at least 60 minutes and 0.85 dscm (30 dscf). (3) The equiv alent P 2 O 5 feed rate (P) shall be computed for each run using the following equation:

P=M p R p where:

M p = total mass flow rate of phosphorus

- bearing feed,

Mg/hr (ton/hr). R p = P 2 O 5 content, decimal fraction. (i) The accountability system of §60.223(a) shall be used to determine the mass flow rate (M p ) of the phosphorus

- bearing

feed. (ii) The Association of Official Analytical Chemists (AOAC) Method 9 (incorpor a ted by reference

— see §60.17) shall be used to

determine the P 2 O 5 content (R p ) of the feed. § 6 0.225 Recordkeeping. An affected facility as defined in § 60.220(a) that commences construction, modification, or reconstruction after [ date of publication of the final rule in the Federal Register ]P age 7 of 7

is subject to the requirements of this section. You must maintain the records identified as specified in § 60.7(f) and in paragraphs (a) and (b) of this section. All records required by this subpart must be maintained on site for at least 5 years. (a) Records of the daily average pressure drop through the

absorb er. (b) Records of deviations. A deviation is determined to have occurred when the monitoring data or lack of monitoring data result in any one of the criteria specified in paragraphs (b)(1) and (b)(2) of this section being met. (1) A deviation occurs when the daily average value of a monitored operating parameter is less than the minimum pressure drop, or greater than the maximum pressure drop established in § 60.223(d)(3). (2) A deviation occurs when the monitoring data are not available for at least 75 p ercent of the operating hours in a day.