Changes

==Scaling==

==Scaling==

Appropriate scaling ensures that performance results from the model tested and verified through ISO 14034 ETV can be confidently applied to other model sizes for the same MTD.  Buyers should ensure to ask vendors to provide sizing data and calculations to confirm that the proposed unit is scaled appropriately.  Verifications conducted in 2023 or later will include information on unit scaling in the publicly available verification statement. A sample scaling calculation is provided here. 

Appropriate scaling ensures that performance results from the model tested and verified through [https://www.iso.org/obp/ui/#iso:std:iso:14034:ed-1:v1:en ISO 14034 ETV] can be confidently applied to other model sizes for the same MTD.  Buyers should ensure to ask vendors to provide sizing data and calculations to confirm that the proposed unit is scaled appropriately.  Verifications conducted in 2023 or later will include information on unit scaling in the publicly available verification statement.

The scaling rules, as stated in the Canadian Procedure, are as follows:  

“The sediment removal rate at the specified SLRs determined for the tested full scale, commercially available MTD may be applied to similar MTDs of smaller or larger size by proper scaling. Scaling the performance results of the tested MTD to other model sizes without completing additional testing is acceptable provided that:

The scaling rules, as stated in the [https://sustainabletechnologies.ca/app/uploads/2023/06/SETV-OGS-PAS-2023-06-01-English-1.pdf Canadian Procedure]<ref>Toronto and Region Conservation Authority, 2023. Canadian Procedure for Laboratory Testing of Oil Grit Separators: A Publicly Available Specification, Toronto, Ontario. https://sustainabletechnologies.ca/app/uploads/2023/06/SETV-OGS-PAS-2023-06-01-English-1.pdf</ref>, are as follows:

1. The maximum treatment SLR prior to the onset of bypass for the similar MTD shall be the same or less than the tested MTD;

2. The claimed sediment removal efficiencies for the similar MTD are the same or lower than the tested MTD at identical SLRs; and

3. The similar MTD is scaled geometrically proportional to the tested unit in all inside dimensions of length and width and a minimum of 85% proportional in depth, where the depth dimension is measured from the outlet pipe invert to the floor of the unit.

If requirements (1), (2) and (3) are not met, then a second full scale, commercially available MTD with a difference in maximum treatment SLR prior to the onset of bypass of at least 250% shall be tested to validate the alternative scaling methodology. Testing of the similar models shall follow the same sediment removal performance testing procedures described in section 5.0. The alternative scaling methodology is deemed to be valid if the sediment removal efficiencies do not differ by more than 2% for SLRs up to 200 L min-1 m-2 , and 3% for SLRs greater than 200 L min-1 m-2 .”

 

"''The sediment removal rate at the specified SLRs determined for the tested full scale, commercially available MTD may be applied to similar MTDs of smaller or larger size by proper scaling. Scaling the performance results of the tested MTD to other model sizes without completing additional testing is acceptable provided that:''

 

# '''''The maximum treatment SLR prior to the onset of bypass for the similar MTD shall be the same or less than the tested MTD;'''''

 

# '''''The claimed sediment removal efficiencies for the similar MTD are the same or lower than the tested MTD at identical SLRs; and'''''

 

# '''''The similar MTD is scaled geometrically proportional to the tested unit in all inside dimensions of length and width and a minimum of 85% proportional in depth, where the depth dimension is measured from the outlet pipe invert to the floor of the unit.'''''<br>

 

   

 

''If requirements (1), (2) and (3) are not met, then a second full scale, commercially available MTD with a difference in maximum treatment SLR prior to the onset of bypass of at least 250% shall be tested to validate the alternative scaling methodology. Testing of the similar models shall follow the same sediment removal performance testing procedures described in section 5.0. The alternative scaling methodology is deemed to be valid if the sediment removal efficiencies do not differ by more than 2% for SLRs up to<br>

 

200 L min^-1 m^-2, and 3% for SLRs greater than 200 L min^-1 m^-2.”

 

The ISO 14034 ETV sediment removal rate data for the tested model at specified surface loading rates may be applied to similar MTDs of smaller or larger size by proper scaling. Scaling the performance results of the tested MTD to other model sizes without completing additional testing is acceptable provided that:

# The claimed sediment removal efficiencies for the similar MTD are the same or lower than the tested MTD at identical surface loading rates; and  

# The similar MTD is scaled geometrically proportional to the tested unit in all inside dimensions of length and width and a minimum of 85% proportional in depth.   

Ensuring the unit is scaled appropriately in all dimensions also helps to ensure that the recommended maintenance intervals for the unit can be achieved.

==Sizing==

==Sizing==