6 022 general chemical sanitization procedure for di distribution loops

| Standard Operating Procedure General Chemical Sanitization Procedure for DI Distribution Loops | SOP No.

6.022 | | --- | --- | | | Effective: 03-03-2005 Supersedes: 03-03-2005 Revision Date: 03-03-2005 Page No.: 1 of 6 | | DCR No.: 05009 Revision No.: 0 | |

1 Purpose

1.1 This procedure is to provide a general procedure how to chemical sanitize deionized (DI) distribution loop.

1.2 General equipment in the DI distribution loop include DI storage tank, loop circulation pump, DI bottles, DI post filters, ultra-violet (UV) sterilizer, and final filters.

2 Scope

2.1 This procedure applies to plastic loop.

(e.g. PVC, PP or PVDF) DI distribution

2.2 This procedure does not apply to stainless steel material.

3 Responsibility

3.2 Service technician shall notify customer when to do the sanitization.

3.1 Service technician shall carefully read this sanitizing DI distribution loop.

ough the procedures prior to

3.3 Service technician shall prepare s sanitization.

efficient materials to be used during the

4 Material and Tools

4.1 Safety Glass

4.2 Plastic Gloves

4.3 Regenerated service DI bottles for replacement and make up DI water.

4.4 1% Solution of Minncare $ \textcircled{2} $ Cold Sterilant (Peracetic Acid Solution, pH 3.5)

4.5 1% Minncare $ \textcircled{2} $ Test Strips

4.6 Minncare $ \textcircled{2} $ Residual Test Strips

4.7 pH Sensor or Litmus Paper

4.8 1/4" Tubing or 500 mL Spray Bottle

4.9 15-20 feet of 1" hose and 1" adapters (u barb) and Hose Clamps.

4.10 2 lbs Baking Soda for Neutralization

4.11 5-Gallon Bucket

5 Procedures

5.1 IMPORTANT: Tag all points of use (POU): "DO NOT USE, CHEMICAL SANITIZATION IN PROGRESS" prior to performing the sanitization. Also, notify customer about the sanitization is in progress.

5.2 Turn off UV sterilizer. Verify that the UV is off.

5.3 Turn off loop circulation pump(s). Verify that the pump is off.

5.4 Turn off loop make up water. Veri into storage tank.

that water is not being introduced

5.5 Close DI bottle(s) inlet & outlet isolation valves, then open bleed valves to relive pressure and drain lines.

5.6 In order not to pass chemical sanit bottles by disconnecting DI bottle( them together.

ker through DI bottles, bypass DI inlet & outlet hoses and connecting

5.7 Close DI bottle(s) bleed valves.

5.8 Open DI bottle(s) inlet and outlet isolation valves.

5.9 Slowly open storage tank's drain v low-low level setpoint. Note: DO N Level Setpoint.

ve and drain water 2 inches above OT drain water below Low-Low

5.10 Turn on loop circulation pump. Verify that the pump is running.

5.11 Follow Minncare instruction to add sufficient 1% solution of Minncare $ \textcircled{2} $ Cold Sterilant into storage tank.

5.12 Circulate water with Minncare
cold sterilant for approximately 25 g.

5.13 Add 2 cups of baking soda in a 5-gallon bucket. The baking soda is used to neutralize the 1% Minncare $ \textcircled{2} $ cold sterilant to pH 7.

5.14 Collect sample in the bucket. Sample at points of use by opening user drop valve and test water with 1% Minncare $ \textcircled{2} $ test strip to confirm the loop water contains 1% concentration of Minncare. Note: If necessary, add more Minncare into storage tank to achieve 1% concentration.

5.15 After confirming to achieve 1% Minncare $ \textcircled{2} $ concentration in the loop, record start time of chemical sanitization on form # 6.022.1, Chemical Sanitization.

5.16 If the storage tank does not have spray ball(s), collect 500mL of 1% Minncare $ ^{\circ} $ cold sterilant in a spray bottle and spray the 1% solution to the upper internal surface of storage tank. Be sure to get all internal surfaces of the tank in order to ensure sanitization. Note: If possible, connect a $ \frac{1}{4} $ flexible hose to a nearby sample valve in the loop (possible on loop return, close to tank) and use this to sanitize the upper interior surface of the tank.

5.17 Allow the water to circulate in the loop for approximately 60 minutes.

5.18 Open user drop valve and collect sanitizer in the bucket.

5.19 Test sample with 1% Minncare $ ^{\circ} $ test strip to confirm 1% Minncare $ ^{\circ} $ concentration. Allow the sanitizer pass through user drop valve for 45 seconds to ensure sanitization of points of use and test sample again with 1% Minncare $ ^{\circ} $ test strip.

5.20 After all points of use have been sanitized and complete of 60 minutes of sanitization in the loop, turn on the loop make-up in order to dilute the Minncare solution. Note: if loop make-up rate is slow (e.g. less than 2 GPM, you can feed city water into a DI polish bottle, producing DI water, and add to storage tank.

Note: When adding water by feeding city water through a DI bottle, total organic carbon (TOC) is not being removed from the water.

5.21 Open the loop storage tank's dr & bleed) in valve to maintain the tank level (feed

5.22 Continue the feed & bleed dilution for 1-2 hours.

5.23 Rinse the interior surface of the storage tank with DI water in order to rinse the sanitizer off the tank walls.

5.24 Collect sample at points of use by opening user drop valve with the 5-gallon bucket. Make sure sufficient baking soda has been added into the bucket.

5.25 Test sample at the points of use with Minncare $ ^{\circ} $ residual test strip to confirm the water concentration is less than 1 ppm residual concentration. Note: This may take longer than 1-2 hours.

5.26 When the residual is less than 1 ppm, allow water to flow through user drops for 45 minutes to ensure the sanitizer is flushed from the point.

5.27 Cycle ball valves in DI system to ensure chemical is not held-up in the valve's internal surface.

5.28 Once the Minncare $ ^{\circ} $ residual is less than 1 ppm, drain the storage tank to the low-low level then close the drain valve and turn off the loop circulation pump. Note: The tank should be filled primarily with the make-up system (e.g.revises osmosis system). This will keep the TOC level to a minimum.

5.29 Close DI inlet and outlet valves and break the connection of inlet and outlet hoses.

5.30 Connect inlet hose to inlet port of new (regenerated) DI bottle(s). Slowly open inlet valve and fill water through the regenerated DI bottle(s).

5.31 Until water level appears at the outlet bottle(s), connect DI outlet hose to the regenerated DI bottle(s).

5.32 Open DI bleed valve to flush DI bottle(s) to drain for at least 3 minutes. Note: The loop circulation pump may be needed to accomplish this.

5.33 With the loop circulation pump off, valve off and remove cartridge filter(s) (DI post filter and final filter) and replace with new filters.

5.34 Return all valves to their normal operating position.

5.35 Turn on the loop circulation pump. Verify that the pump is running.

5.36 Turn on the UV sterilizer. Verify that the UV is on.

5.37 After the system has been stabilized for 15 minutes, record the operating conditions on form # 6.022.1, Chemical Sanitization.

5.38 Remove Tag at all points of use. I sanitization.

notify customer about the completion of