ENGINEERING DESIGN GUIDE UNITHERM...

Transcription

1 ENGINEERING DESIGN GUIDE UNITHERM... Preface This Engineering Design Guide is directed to the design engineer as a guide for the use of UNITHERM products and accessories in a heat traced system. Product Design Specifications UNITHERM steam trace tubing products are designed to provide even heating to the tube(s) throughout the entire length of product and to Conversion Factors Absolute Pressure, Lb. Per Sq. In. obtain a thermal insulation configuration which will have the ultimate in efficiency and still produce a final product which is round and small enough to facilitate easy installation. The product design consists of a process tube(s); a tracer tube(s); hydrophobic, inorganic, fibrous glass thermal insulation; and an outer covering of a smooth, continuously extruded, 15ºC black polyvinylchloride jacket mills in thickness. Performance Data The performance data contained in this guide was generated by actual tests under laboratory conditions. Actual values will vary under differing field conditions. MOLLIER CHART Temperature Conversions 1 BTU = FT.LB., 1 KW.HR = BTU C F C F C F Saturation Absolute Saturation Temperature Pressure, Temperature Deg. Fahr. Lb. Per Sq. Deg. Fahr. In To convert from PSI to Bar multiply by.69 To convert from feet to Meters multiply by.348 To convert from inches to Centimeter multiply by 2.54

2 ENGINEERING DESIGN GUIDE FOR TRACE PRODUCTS UNITHERM.. 2 Pre-Insulated Tubing 221/223 Heavy Steam Trace Tubing 222/224 Light Steam Trace Tubing Principal of Operation Unitherm 2 pre-insulated tubing is a thermally insulated steam, gas or liquid transportation line. It is comprised of a process tube; hydrophobic inorganic fibrous glass thermal insulation; and weather protective black 15ºC PVC jacket. This energy efficient surface temperatures of ºF (ºC) or lower at ºF (26ºC) ambient conditions, while transporting ºF (24ºC) PSIG saturated steam. The compact design, thermal efficiency and rugged jacket provide an insulated product with low heat loss, zero maintenance, employee protection and saves up to 5% on installation cost. Alternate jacket materials available for special applications. How to Specify Example: 2-41A49 Unitherm pre-insulated line; (1) 1 /2 O.D. x.49 wall #122 copper process line; hydrophobic inorganic fibrous glass thermal insulation; 15ºC black PVC jacket; MTR*= ºF Principal of Operation Unitherm 221/223 pre-insulated steam trace consists of single and multiple process lines; single tracer line; hydrophobic inorganic fibrous glass thermal insulation; and a black 15ºC PVC jacket. It is designed for heavy tracing of process, sampling and impulse lines to help prevent freezing, to decrease fluid viscosity and protect against low temperature degradation. This highly efficient, compact product is designed to limit the jacket to a nominal surface temperature of ºF (ºC) or lower at ºF (26ºC) ambient conditions, with tracer temperatures at ºF (24ºC) PSIG saturated steam. Alternate jacket materials available for special applications. How to Specify Example: 221-2A21 Unitherm steam trace tubing (1) 1 /4 O.D. x.35 wall 316-Welded S/S process tube; (1) 1 /4 O.D. x.35 wall #122 copper tracer line; hydrophobic inorganic fibrous glass thermal insulation; 15ºC black PVC jacket; MTR*= ºF Principal of Operation Unitherm 222/224 pre-insulated steam trace consists of single and multiple process lines; single tracer line; hydrophobic inorganic fibrous glass thermal insulation; and a black 15ºC PVC jacket. It is designed for heavy tracing of process, sampling and impulse lines to help prevent freezing, to decrease fluid viscosity and protect against low temperature degradation. This highly efficient, compact product is designed to limit the jacket to a nominal surface temperature of ºF (ºC) or lower at ºF (26ºC) ambient conditions, with tracer temperatures at ºF (24ºC) PSIG saturated steam. Higher temperatures designs for tracing applications up to ºF are available. How to Specify Example: 222-2A21 Unitherm steam trace tubing (1) 1 /4 O.D. x.35 wall 316-Welded S/S process tube; (1) 1 /4 O.D. x.35 wall #122 copper tracer line; hydrophobic inorganic fibrous glass thermal insulation; 15ºC black PVC jacket; MTR*= ºF

3 PERFORMANCE CURVES FOR TRACE PRODUCTS Instructions for use of Performance Curves for 221 Family 221-2A21 3A21 A21 3A31 A31 Temperature Distance The following graphs are plots of the process tube temperature versus run length for various steam pressure and ambient 1 Maximum run length to maintain Locate the minimum allowable process tube temperature on the Y-axis. Draw a line horizontally to intersect the lowest expected ambient. Drop a line vertically to intersect the X-axis. The point of maximum run length to maintain 2 The graphs are for one product in a family. For other specific products in the same family, take the given value from the graph and multiply by the factors given in the table at the top of each page. GRAPH III 3ºF 221-2A21 17ºC 3 12 PSIG 15 & 12 PSIG 15 PSIG PSIG PSIG ºF ºF ºF ºF -ºF ºF ºF ºF GRAPH IV 3ºF PSIG 221-2A21 17ºC 3 3, & PSIG 3 PSIG PSIG ---- ºF ºF 2 ºF 3 PSIG 13 2 ºF ºF ºF -ºF ºF ºF ºF -ºF ºF

4 PERFORMANCE CURVES FOR TRACE PRODUCTS Instructions for use of Performance Curves for 223 Family 223-3B31 B31 Temperature Distance The following graphs are plots of the process tube temperature versus run length for various steam pressure and ambient 1 Maximum run length to maintain Locate the minimum allowable process tube temperature on the Y-axis. Draw a line horizontally to intersect the lowest expected ambient. Drop a line vertically to intersect the X- axis. The point of maximum run length to maintain 2 The graphs are for one product in a family. For other specific products in the same family, take the given value from the graph and multiply by the factors given in the table at the top of each page. GRAPH V 3ºF 223-3B31 17ºC 3 12 PSIG 15 & 12 PSIG 15 PSIG PSIG PSIG - F ºF 12 2 ºF ºF ºF ºF ºF ºF GRAPH VI 3ºF PSIG B31 3,& PSIG 3 PSIG PSIG--- 2 ºF ºF PSIG ºF ºF ºF ºF ºF -ºF ºC 17 5

5 PERFORMANCE CURVES FOR TRACE PRODUCTS Instructions for use of Performance Curves for 222 Family 222-2A21 3A21 A21 A31 Temperature Distance The following graphs are plots of the process tube temperature versus run length for various steam pressure and ambient 1 Maximum run Locate the minimum allowable process tube temperature on the Y-axis. Draw a line horizontally to intersect the lowest expected ambient. Drop a line vertically to intersect the X- axis. The point of maximum run 2 The graphs are for one product in a family. For other specific products in the same family, take the given value from the graph and multiply by the factors given in the table at the top of each page. GRAPH VII 7ºC ºF 12 PSIG Process Tube Temperature GRAPH VIII ºF 15 PSIG ºF PSIG ºF 15 PSIG ºF ºF 3 12 PSIG ºF 2 15 PSIG ºF 222-2A21 12 PSIG 15&12 PSIG 1 -ºF Steam 15 PSIG 2 -ºF PSIG 7ºC 3 PSIG PSIG ºF ºF 5 ºF 3 PSIG PSIG ºF ºF ºF 3 3 PSIG PSIG ºF ºF ºF 3 PSIG 222-2A21 1 3, & PSIG 2 3 PSIG -ºF PSIG -- -ºF -ºF

6 PERFORMANCE CURVES FOR TRACE PRODUCTS Instructions for use of Performance Curves for 224 Family 224-3B31 B31 Temperature 1..9 Distance 1..9 The following graphs are plots of the process tube temperature versus run length for various steam pressure and ambient GRAPH IX ºF B31 15 & 12 PSIG Steam 9ºC 7 1 Maximum run Locate the minimum allowable process tube temperature on the Y-axis. Draw a line horizontally to intersect the lowest expected ambient. Drop a line vertically to intersect the X- axis. The point of maximum run 2 The graphs are for one product in a family. For other specific products in the same family, take the given value from the graph and multiply by the factors given in the table at the top of each page. GRAPH X ºF 1 12 PSIG 15 PSIG PSIG ºF ºF 5 15 PSIG ºF 12 PSIG ºF 3 15 PSIG ºF 2 ºF 12 PSIG PSIG -ºF -ºF DISTANCE FROM INLET (FEET) 224-3B31 3, and PSIG PSIG 7 3 PSIG ºF ºF PSIG 5 12 ºF 3 PSIG ºF ºF PSIG ºF PSIG ºF ºF PSIG ºF 1 3 PSIG 9ºC 2 -ºF -ºF -ºF DISTANCE FROM INLET (FEET)