mid13284 1 particulate

Method Implementation Document (MID 1)

BS EN 13284-1:2002

Stationary source emissions – Determination of low range mass concentration of dust – Part 1: Manual gravimetric method

Environment Agency

April 2003

Foreword The Environment Agency has established its Monitoring Certification Scheme: MCERTS to deliver quality environmental measurements. The scheme provides for the product certification of instruments, the competency certification of personnel and the accreditation of laboratories based on international standards. MCERTS is being extended to cover all regulatory monitoring activities. MCERTS for manual stack-emissions monitoring has been developed in collaboration with the Source Testing Association (STA), the UK trade association representing manual emission monitoring companies, the Scottish Environment Protection Agency (SEPA) and the Environment and Heritage Service, Department of Environment, Northern Ireland. The scheme is split into two components – the certification of personnel and the accreditation of organisations. The term ‘organisation’ is used generically. It includes commercial ‘test houses’, laboratories and industrial operators’ in-house monitoring arrangements. The Agency’s Monitoring Certification Scheme: MCERTS recognises that where necessary standard methods need supplementing by Method Implementation Documents (MIDs) to ensure that they are being implemented consistently. Organisations wishing to include EN 13284-1 in their scope of MCERTS accreditation shall follow the requirements of the Standard and this MID. This document is one of a series of documents that the Agency intends to produce, where required, to supplement standard methods called up by Technical Guidance Note M2. These documents provide details on how the preferred standard methods shall be used for regulatory monitoring under MCERTS. Further information on MCERTS including copies of the performance standards, examination syllabuses and guidance can be obtained from the Agency’s web-site at: www.environment-agency.gov.uk/business/mcerts/ If you have any general questions about MCERTS, please contact: Environment Agency Cameron House White Cross Industrial Estate South Road Lancaster LA1 4XQ

Tel: 01524 842704

Fax: 01524 842709

Contents Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Sampling plane and sampling points 6 Equipment and materials 7 Weighing procedure 8 Sampling procedure 9 Thermal behaviour of dust 10 Validation of results 11 Calculation 12 Performance characteristics of the method 13 Test report Annex A (Normative) Requirements related to the working platform Annex B (Normative) Determination of flow direction with Pitot tubes Annex C (Normative) Methods and rules for determining the positions of sampling points in circular and rectangular ducts Annex D (Informative) Examples of suitable access ports for sampling equipment Annex E (Normative) Proven design of the entry nozzle Annex F (Normative) Summary of requirements Annex G (Informative) Sampling volume, flow rate and duration Annex H (Informative) Examples of weighing bias

Introduction European Standard BS EN 13284-1:2002 (referred to in this document as EN 13284-1) is a reference method for the measurement of low dust concentration in gaseous streams below 50 mg/m3 standard conditions. The Agency’s Monitoring Certification Scheme: MCERTS recognises that where necessary standard methods need supplementing by Method Implementation Documents (MIDs) to ensure that they are being implemented consistently. Organisations wishing to include EN 13284-1 in their scope of MCERTS accreditation shall follow the requirements of the Standard and this MID. This document supplements EN 13284-1. However, it does not re-state all the provisions of EN 13284-1 and organisations are reminded of the need to comply with all the relevant criteria detailed in EN 13284-1. The clause numbers in this document follow those of EN 13284-1 although the text from the standard is not repeated in this document. EN 13284-1 remains the authoritative document and in cases of dispute, the accreditation body will adjudicate on unresolved matters. 1 Scope EN 13284-1 shall be used to measure particulate concentrations below 20 mg/m3. Note: BS ISO9096: 2003 or BS EN 13284-1 should be used for concentrations from 20 – 50 mg/m3. For concentrations from 50 – 1000 mg/m3 BS ISO 9096 should be used. 2 Normative references No additional requirements to EN 13284-1. 3 Terms and Definitions The key for Figure 1 – isokinetic sampling should read as follows: 2 Radius of the bend (minimum 1.5i) 3 Internal diameter I 4 Principle Note: besides detailing the principle of the method this section also contains requirements that must be complied with. 5 Sampling plane and sampling points 5.1 General Details on sampling platforms requirements are provided in Technical Guidance Note M1.

MID 13284-1, version 1, April 03 Page 1 of 8

5.2 Sampling plane The requirement for the location of the sample plane and therefore the position of the sampling ports is based on meeting the flow profile criteria listed in this section. The standard gives a recommendation for sample plane location, this is not a mandatory requirement but a guide which is useful for locating sample ports when the flow profile is unknown. The flow profile should be checked at the required sample points. If requirements (a) (and d) of the standard regarding the angle of flow and velocity cannot be met the sampling location should be changed to one that is suitable. If after consultation with the Agency a suitable sampling location cannot be found then it may be acceptable to carry out the method with an increased number of sampling points. The Agency recommends that the number of sampling points should be double the recommended number of points detailed in section 5.3 of the standard. However, it must be stated in the monitoring report that the sampling carried out is not in full compliance with the standard (see 10.2 of the standard). Section 5.2 (c) of the standard states that the minimum velocity of the stack gas must be larger than 5Pa if a pitot tube is used to carry out the measurement. It is possible to carry out sampling at velocities lower than 5Pa if an anemometer is used, provided that the velocity of the stack gas is above the limit of detection of the device and it has been calibrated within the region of the expected velocity. If local negative flow is present (requirement (d)) then the sampling location is not in compliance with the standard. The option to increase the number of sampling points if there is negative flow is not given in the standard. 5.3 Minimum number and location of sampling points No additional requirements to EN 13284-1. 5.4 Access ports and working platform The standard port that has been commonly installed in the UK is 100mm (4”) diameter. When new ports are to be fitted on existing or new process then it is strongly recommended that they have a minimum diameter of 125mm (see Annex D of the standard). 6 Equipment and materials 6.1 Gas velocity, temperature, pressure and composition measurement devices 6.2 6.2.1 No additional requirements to EN 13284-1. 6.2.2 The key for Figure 3 – Example of in-stack filter sampling system should read as follows:

10g – Bypass control valve 10h – Orifice plate (can be heated)


Two different configurations of the sampling equipment may be used depending on the characteristics of gases to be sampled. The figure below provides a flow chart to determine which type of sampling system to use. Flow chart to determine whether in-stack or out of stack filter is required No

Stack gas bel(i.e. water dro

6.2.3 Titanium parts are n20 ppm. An alternatithese circumstances. 6.2.4 Entry nozzle Paragraph 4 of this sthickness and nozzle0.15mm, unless the 6.2.5 Suction tube No additional requir 6.2.6 Filter holder No additional requir 6.2.7 Filters No additional requir 6.2.8 Suction unit No additional requir

MID 13284-1, versio

Is the expected particulate concentration within the scope of the standard (below 50 mg/m3)?

Yes

ow dew point plets present)

Use in stack filter

Stack gas above dew point

s

ot corrosion resistant in gas concentrations with fluorideve material such as stainless steel, quartz or glass shall

ection provides criteria about the relationship between diameter. When using a 6mm nozzle the wall thicknesnozzle has been validated.

(Out-stack filtration devices)

ements to EN 13284-1.



and gas metering devices


n 1, April 03

Use BS ISO 9096:2003

Determine the temperature of the proces

Use out of stackfilter

contents above be used under

nozzle wall s must be less than

Page 3 of 8

6.3 Dust deposit recovery accessories The dry residue value of the acetone blank must be quoted in the report separately from the overall blank. 6.4 Equipment for conditioning and weighing No additional requirements to EN 13284-1. 7 Weighing procedure 7.1 General aspects Ceramic containers shall be used for weighing the residue of evaporated rinsing solutions. Note CEN document number CEN/TC 264 N 330 provides details of the validation of containers used for weighing the rinsing solutions. CEN tested containers made of different material and recommend that ceramic containers. Copies of this document are available from the STA. 7.2 Pre-sampling conditioning No additional requirement to EN 13284-1. 7.3 Weighing No additional requirement to EN 13284-1. 7.4 Post-sampling treatment of weighed parts No additional requirement to EN 13284-1. 7.5 Post-sampling treatment of the rinsing solutions Note: the following documents are available from the STA regarding additional tests carried out during the validation trials: 1. CEN/TC 264 N 331 - Uncertainty of the procedure for determination of the mass of dust in the rinsing

solutions. 2. CEN/TC 264 N 330 - Evaluation of a procedure for the recovery of dust deposits upstream of the filter. 7.6 Improvement of the weighing procedure No additional requirements to EN 13284-1. 8 Sampling procedure 8.1 General aspects No additional requirements to EN 13284-1. 8.2 Preparation A clean enclosed area shall be used for the preparation and recovery of filters.


Note it is recommended that filters are prepared and recovered at the premises of the monitoring organisation. 8.3 Pre measurements Flow variations in the duct shall be checked at a fixed point at least every 5 minutes while sampling using a Pitot tube or another suitable measurement device. The moisture content shall be determined before sampling. 8.4 Sampling procedure a) A leak check of the sampling equipment shall be carried out by sealing the nozzle and starting the suction device before and after sampling. The leak rate shall be stated in the measurement report. The method described in the standard for checking leaks continuously while monitoring using gas analysers cannot be used to check leaks before and after sampling. Note: an oxygen analyser could be used to measure the stack gas oxygen directly from the stack while another oxygen analyser could measure the exhaust gas from the particulate sampling train. The two reading should be the same if there is no leak in the sample train. However, this only checks leaks on the equipment outside of the gas stream and does not indicate a leak in equipment inside the gas stream, such as an in-stack filter holder. b) the requirements of this section of the standard can be met by either inserting the probe (with the nozzle facing downstream) into the duct and allowing it to equilibrate to the stack conditions or by external conditioning such as pre heating in an oven or using a heat gun. This shall be done for a minimum time of 10 minutes. c) – e) no additional requirements to EN 13284-1. f) Flow variations in the duct shall also be checked while sampling at each sampling point during the sampling exercise. g) – l) no additional requirements to EN 13284-1. 8.5 Recovery of deposits upstream of the filter If the purpose of the measurement is to calibrate a continuous emission monitoring system using prEN*** then the non-weighed parts upstream of the filter shall be recovered after each individual test. The amount of dust recovered from rinsing shall included in the measurement report. 8.6 Overall blank sample The dry residue value of the acetone blank must be quoted in the report separately from the overall blank. 9 Thermal behaviour of dusts Fibreglass filters shall not be used.


10 Validation of results

10.1 General No additional requirements to EN 13284-1.

10.2 Parameters depending on the stationary source No additional requirements to EN 13284-1. 10.3 Leak check No additional requirements to EN 13284-1. 10.4 Isokinetic rate No additional requirements to EN 13284-1. 10.5 Deposits of dust on non-weighed parts upstream the filter. The filter holder shown in annex figure E1 is based on the German VDI 2066 method. If this style of filter holder is used and providing that the deposition is less than 10% compared with the weighed dust of the filter holder then rinsing of the upstream parts are not necessary. However it must be noted that this has to be validated at every different stack location by comparison of the deposits to the dust on the filters on at least 10 samples. 10.6 Overall blank No additional requirements to EN 13284-1. 11 Calculation 11.1 Sampling volumetric flow rate No additional requirements to EN 13284-1. 11.2 Dust concentration No additional requirements to EN 13284-1. 12 Performance characteristics of the method 12.1 General aspects No additional requirements to EN 13284-1. 12.2 Experimental data No additional requirements to EN 13284-1. 12.3 Comments


No additional requirements to EN 13284-1. 13 Test report The report shall include the details stated in Annex H of the MCERTS performance standard for organisations. Annex A (normative) Requirements related to the working platform This annex refers to the use of permanent platforms. If a temporary platform is used it shall meet the requirements of Agency Technical Guidance Note M1 and the STA Hazards Risk and Risk Control in Stack Testing Operations. Annex B (normative) Determination of flow direction with Pitot tubes No additional requirements to EN 13284-1. Annex C (normative) Methods and rules for determining the positions of sampling points in circular and rectangular ducts No additional requirements to EN 13284-1. Annex D (informative) Examples of suitable access ports for sampling equipment Recommended access port design

Key

1. Flange BS 10 - 125 mm (5”)

2. Pipe stub 125 mm (5”)

3. The STA recommend that the pipe stub length should be a minimum of 100 mm from the stack wall

4. Recommendation that a unistrut is fitted vertically to centre line of sample port on the stack wall for positioning of a monorail system



Annex E (normative) Proven design of the entry nozzle Figure E.1 and E.2 in Annex E of the standard are examples of nozzle designs. Providing the bend radius of the nozzle is greater than 1.5 times the diameter of the tube and the straight length before the bend is greater than 30mm other designs can be used, such as gooseneck. Annex F (normative) Summary of the requirements Note when the requirement for sampling location is followed by (recommended) this is informative and is only a recommendation. Annex G (informative) Sampling volume, flow rate and duration No additional requirements to EN 13284-1. Annex H (informative) Examples of weighing bias No additional requirements to EN 13284-1.