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Tube Material Optious <br />There are two materials that are rypically used in shell and tube rype chillers, carbon steel and <br />stainless steel. Vilter manufacturing said they have never sold a vessel with any other type of <br />tube material. <br />The system will lose approximately 3% to 4% operating efficiency using stainless steel tubes in <br />place of carbon steel tubes due to the heal transfer characteristics o�F the material. However, <br />stainless steel tubes have a lower fouling factor (i.e. slightly less chance to plug or scale). <br />Overall, when comparing heat transfer efficiency and fouling factor, the performance of stainless <br />steel tubes are approximately equal to the perforn�ance of carbon steel tubes. Stainless steel <br />tubes may last slightly longer than carbon steel depending on how well the system is maintained. <br />If the vessel is re-tubed with a different rype of material the vessel with have to be recertified. <br />If a change was inade to stainless steel tubes, the tube sheets in the chiller would also have to be <br />replaced. The total cost of this change is included in Table 2�� Thcre appears to be little if any <br />advantage to re-tubing the chiller with stainless steel material and the cost would be substantial, <br />therefore, it is recommended that the existing carbon steel tubes be replaced with the same <br />material. <br />Cost Estimates for Chiller Options <br />The cost estimates presented in this table are based on carbon steel tube material. Included at the <br />end of the table is the cost to switch from carbon steel to stainless steel tube material. Not <br />included in this table is the cost to dispose of the existing calcium chloride solution that is <br />contaminated with ammonia. This cost could be substantial if it is classified as a hazardous <br />waste. <br />Table 2A. Cost Estimates for Ite-tube the Existing Chiller– Option 2A <br />r Item <br />, 12,4: I ��� il�� �atstia� �h1fler s��3 a'r� ���,�1.II�bts _ ._� <br />i �.�I �SL'f I'I�c7lririiCl-[x <br />Addi�ia,r,�l �mm� ��� ia { 5U�7 �bs]— — — — — —. <br />� R��Piarb� k}��i�rn with c$Ic:um cf�l�r;d� �u��,��+an -- --- <br />G�i'1FiS �Sili[18 i�� C �I7�iri�l i,,�� f.:� �xl � <br />d•�iimaic. J�s�,i r�ti, �i u I�.c���xl �u4cion �'t�nling�nc�+ f �C�'fb *_ <br />I-�]�r_I �k��1771 [��c3 {�L�i�el rti{I irF-I t.'�]sl � <br />'� Engineering ���:1� 1��•�� er• _ � _ <br />'� Total Estimated Project Costs (Re-tu�in� {�ialis���� <br />#See explanation in Cost Estimate seclian of the report <br />� <br />_ �. <br />Cos� <br />– -'�.�+_ j+�. . <br />--.5.3i3Oti9 r� <br />�fi�1�F � <br />� ���J00. <br />_��?8,�40� . <br />... �1�. r0�1 � <br />�2 � •J, I{��] � <br />� ry I.i� Itill <br />S�� <br />� <br />