Chlorine-Specialties - Model C-265 -Pipeline Diffuser

Ordering Procedure for C-265

To order a C-265 pipeline ffiffuser three numbers are involved. (See Table Fig. 1). The first number represents the chlorine solu¬tion pipe size. The second number represents the insert pipe size, The third number represents the pipeline diameter in inches. The two flanges of the diffuser always retain the same relationship to each other and this is the basis of our code numbering system. The user must, however, furnish the flanged insert connection on the pipeline to the dimension shown in Fig. 2 and with a flange that matches the inner flange of the diffuser. For example, the code number of a 2" C-265 diffuser for a 12" pipe is C-265. (2 x 3 x 12). This means the insert is a 3" pipe with a class 150 flange- The inner flange on the C-265 will match this flange while the outer flange is for 2" pipe, All C-265 diffusers are designed to penetrate to the center of the pipeline.

Potable Water vs Wastewater Treatment

Emphasis on adequate mixing is usually greater in wastewater chlorination than for potable water. This is largely due to the fact that wastewater chlorine dosages are 5-8 times those for potable water However it should be pointed out that the diffusers C-265, C-266 and C-267 for pipes flowing full are specifically designed to provide a properly mixed sample in the least amount of lag time for residual control purposes in water supply conduits.

It should also be pointed out that while the open channel diffusers C-365 and C-367 are used primarily in wastewater for efficient disinfection, diffuser C-266 (Fig. 3) is the most satisfactory diffuser for treating raw sewage for odor control. This diffuser can be installed in those cases so that there will be a negligible amount of obstruction to the sewage flow.

The design concept details of these diffusers are fully described in the Handbook of Chlorination Second Ed. by Geo. Clifford White. Van Nostrand Reinhold New York, NY 1986. See Chapter 8 pages 539, 540, 544-551; Chapter 9 pages 662-664 and Appendix pages 1031-1033.

Diffusers as Mixers

In the early years of chlorination, diffusers were designed primar­ily to carry and inject a corrosive chlorine solution to the point of application. However in recent years with extensive use of chlorine for wastewater disinfection it has been demonstrated that diffusers can be designed to perform as a satisfactory mixing device. This is true for both closed conduits and open channels. With this in mind, diffusers furnished by Chlorine Specialties are designed to provide maximum mixing performance based upon more than twenty years experience. It should be pointed out however that local conditions involving hydraulic transients are the responsibility of the design engineer and are beyond our control.

Hydraulic Design Considerations

All CL2S jet diffusers, both the closed conduit and open channel types, are designed to produce a jet velocity of 23-26 ft/sec. This results in a d iff user head loss of about 10 ft of water. The C-265 is not a jet type diffuser. It is used where pipes flowing full up to and including 24 inches in diameter.

Materials of Construction

All of these custom made diffusers are made entirely of PVC, The fittings are heavy socket weld and the pipe is schedule 80 PVC.