15015-CLEAN & FLUSH EXIST PIPING.doc

SECTION 15015 - CLEAN & FLUSH EXISTING PIPING

PART 1 - GENERAL

1.01

SECTION INCLUDES

A. Isolate existing chilled/hot water piping from fan coils, chiller and any other coil or appurtenance that would be damaged during flushing operation.

B. Flush piping twice with mild acidic solution and rinse twice until clear; basically and acidically neutralized to between pH-6.5 to 7.5.

C. Repair any leaks found in any portion of the existing chilled/hot water piping.

1.02

WORKMANSHIP

It is the intent of this project to contract for a completed work, finished in all respects, and accomplished by mechanics skilled in the trades involved and performed in the highest standards of workmanship.

1.03

ENVIRONMENTAL PROTECTION

Do not discharge fuels, oils, pesticides or any other toxic or hazardous substance into the storm or sanitary sewers of the base. Where applicable, use best management practices to control dust and prevent erosion on the construction site.

1.04

JOB CONDITIONS

A. Deliver acidic solution to job site in original nonbroken factory packaged barrels, labeled with manufacturer's density and percent of mixture.

B. The contractor shall be responsible for all existing chilled/hot water piping and shall repair any damage or defect caused by the cleaning process or not.

1.05

FLUSH CHILLED WATER PIPING

A.

Flushing Process shall be as follows:

1. Step I - Flush all piping and components with water until discharge is clear and clean.

2. Note: Isolate all parts of the chilled/hot water piping system that would be damaged by the muriatic acid prior to pumping this weak, buffered solution through the system.

3. Step II - Pump and circulate a 5% solution of muriatic acid through the chilled water piping system for not less than 4 hours. The discharge shall be pumped back into the 55 gallon barrels it was pumped from. Clean all in-line strainers, empty basket strainers, and check the operation of all valves; (clean them as required). (PR, Insure that the converter(s) and the chiller are separated from the chilled/hot water piping system:)

4. Note: This muriatic acid solution shall not be reused in the next flushing.

5. Step III - After strainers are cleaned, flushed the entire system with water and contain in barrels until pH tests shows dilution is between pH-6.5 and 7.5. Then flush to sanitary drain only. Do Not Dump the muriatic acid until it is neutralized to between pH-6.5 and 7.5 in any sanitary drain.

6. Step IV - Repeat steps II and III.

7. Step V - Fill chilled water system after connecting chiller, fan coils and air handlers and all joints have been inspected for leaks. Pressurized systems and bleed out the air.

PART 2 - PRODUCTS

Not Used

PART 3 - EXECUTION

Not Used

END OF SECTION

15015 - 1 of 2 15015-CLEAN & FLUSH EXIST PIPING.doc