Orifice Plate. Stainless Steel. Flow Data. Herz Valves UK Ltd.

Transcription

1 Stainless Steel Orifice Plate Flow Data In this flow data manual we have endeavoured to make the information as accurate as possible. We cannot accept any responsibility should it be found that in any respect the information is inaccurate or incomplete or becomes so as a result of further developments or otherwise. Herz Valves UK Ltd. Herz Valves UK Ltd. 00 Fax: Website:

2 Technical Data HERZ-Stainless steel orifice plate PN The flow rate can be calculated using the K vs value and a measured signal. March 00 Issue Installation K v = Q K vs = Q P Ps where Kv &Kvs = flow coefficient (m 3 /hr at bar differential) Q = flow rate (m 3 /hr) P = headloss attributable to valve (bar) Ps = differential press across tappings (signal) (bar) Size DN5 DN0 DN00 DN5 DN50 DN00 K vs Values K vs Size DN50 DN0 K vs The pressure loss across the orifice plate can be determined by multiplying the signal by the pressure loss factor. Pressure Loss The pressure loss is always less than measured signal. Size DN5 DN0 DN00 DN5 DN50 DN00 Factor Pressure Loss Factors Size DN50 DN0 Factor Under the Pressure Equipment Directive (PED) these orifice plates have been specified for Group Liquids i.e. non hazardous Sizes DN50 to DN0 are classified as SEP PED Categorisation Herz Valves UK Ltd.

3 Technical Data HERZ-Stainless steel orifice plate PN Orifice Plates can be installed in isolation or close coupled to a globe double regulating valve complying to BS 7350, of the same nominal diameter. March 00 Issue Installation Regardless of installation there must always be a minimum of 5 pipe diameters of straight pipe, without intrusion, upstream of the orifice plate. When used in isolation a minimum of pipe diameters of straight pipe are required downstream of the orifice plate. When close coupled to a double regulating valve no straight pipe is required after the valve. When used in conjunction with a butterfly double regulating valve, a spool piece equivalent to a minimum of pipe diameters is required between the orifice plate and butterfly valve. For more detailed instructions please refer to the Installation, Operation and Maintenance Instructions supplied with the orifice plate. 5D 3D 5D 5D D Once the required flow rate has been calculated, the size of the orifice plate can be determined based on the following: The minimum signal at the design flow rate of kpa. For minimum pressure loss, a maximum signal of.7 kpa, which corresponds to the maximum differential pressure range of a flurocarbon manometer. Sizing Herz Valves UK Ltd.

4 Art. HV70-07 Dim. DN5 0 0 Kvs =

5 Art. HV70-0 Dim. DN0 0 0 Kvs =

6 Art. HV70-09 Dim. DN Kvs =

7 Art. HV70-0 Dim. DN5 0 0 Kvs =

8 Art. HV70 - Dim. DN Kvs =

9 Art. HV70 - Dim. DN Kvs =

10 Art. HV70-3 Dim. DN Kvs =

11 Art. HV70 - Dim. DN0 0 0 Kvs =