Chemical Treatment procedure for HVAC system..

Your question is jumbled and trys to combine too many topics in too small a space.

Are you interesting in cleaning and flushing treatments or on-going chemical treatments?

What is the concern with looping? What kind of tests are you looking for?

What is your location and raw water conditions?

Review this specification, modify it for your needs and send it to a water treatment contractor. The sales representatives are very good at helping out knowledgeable operators!

NC STATE University Construction Guidelines

15189 HVAC Water Treatment

Rev 0 – 07/26/04 Page 1 of 4

15189 HVAC Water Treatment

Part 1: General

1.01 This section sets forth the minimum requirements for HVAC WATER TREATMENT

used on University building renovations or new construction.

1.02 This section includes water-treatment systems for the following:

�� Heating, hot water piping (closed-loop system).

�� Chilled-water piping (closed- loop system).

�� Heating, steam and condensate piping).

�� Condenser water piping (open system).

Part 2: Design Guidelines

2.01 CHEMICAL FEED DESCRIPTION

A. Closed-Loop System: One bypass feeder on each system with (5 gallon size on all

systems with > 1, 000 gallon volume) isolating and drain valves at circulating pumps,

unless otherwise indicated.

B. Closed- Loop Heating Steam and Condensate Piping: Lead-lag switch controls the

sequence of boilers and introduces the chemical to the boiler through an appropriate

chemical feed system.

C. Open- Loop Condenser Water Piping: Chemical feed and bleed control systems with

integrated inhibitor and dual biocide feed

2.02 PERFORMANCE REQUIREMENTS

The water treatment program includes boiler systems, cooling towers, hot water loops,

and chilled water loops. The contractor will provide all chemical products (currently

consisting of oxygen scavenger, scale inhibitor, organic dispersant, alkalinity adjustment,

condensate treatment, fuel oil treatment, combination scale/corrosion inhibitor with

dispersants, non-oxidizing Biocide A&B closed water treatment, and lay-up treatment as

required), along with equipment, and professional consulting services to accomplish the

following:

A. Produce clean heat transfer surfaces which are substantially free of scale, sludge,

deposits, corrosion, pitting and biological growth when treatment is administered in

accordance with vendors directions and recommendations.

B. Reduce fuel and electrical consumption through improved heat transfer efficiency, by

minimizing scale, corrosion, fouling and microbiological growth which create deposits on

heat transfer surfaces.

C. Minimize repair and maintenance costs associated with replacement and cleaning of

equipment due to scale, corrosion, fouling or microbiological activity.

NC STATE University Construction Guidelines

15189 HVAC Water Treatment

Rev 0 – 07/26/04 Page 2 of 4

D. Provide professional, knowledgeable and involved sales/service personnel to ensure

program success.

E. Accurately monitor program results and communicate appropriate recommendations

with quantifiable business oriented justifications.

F. Provide Training to University personnel on the implementation and control of the

program.

2.03 SUBMITTALS

A. Product Data: Include rated capacities; water-pressure drops; shipping, installed, and

operating weights; and furnished products listed below:

�� Pumps

�� Chemical feed and bleed control systems with integrated inhibitor and dual

biocide feed tank.

�� Chemical bypass feeders

�� Chemical water treatment program and MSDS

�� Test equipment

�� Filters

2.04 QUALITY ASSURANCE

Installer Qualifications: Provide an experienced installer who is directed by an authorized

representative of the chemical treatment supplier for both installation and maintenance of

chemical treatment equipment.

3.01 PRODUCTS

A. MANUFACTURERS

Manufacturers: Subject to compliance with requirements and in conjunction with the

existing contracted University HVAC Water Treatment Program, provide products by the

current Chemical Treatment Vendor for the University:

Contact Facilities Operation to obtain the current contracted Vendor.

Every effort must be made to maintain a level of uniformity in chemical formulation to

insure a line of continuity. Deviation from existing formulations that are applied across

the University shall be avoided.

Provisions should be made for the removal for any unused chemicals. In addition,

provisions must be provided for the proper disposal of all empty containers.

B. CHEMICAL TREATMENT TEST EQUIPMENT

�� Test Kit: Furnish all necessary manufacturer recommended equipment and

chemicals for testing and controlling the water treatment. Provide a program for

testing pH, bio-count, chloride, alkalinity, total hardness, and inhibitor.

�� Corrosion Test Coupon Assembly: Constructed of corrosion resistant material,

complete with piping, valves, mild steel and copper coupons. Insure 6 gpm flow

across the coupons. Locate copper coupon downstream from mild steel coupon

NC STATE University Construction Guidelines

15189 HVAC Water Treatment

Rev 0 – 07/26/04 Page 3 of 4

in the test coupon assembly. Analysis of the coupons each 90 days will be

performed at no additional cost to the University.

C. CHEMICALS

Furnish chemicals recommended by water treatment system manufacturer that are

compatible with piping system components and connected equipment.

�� System Cleaner: Liquid compounds with emulsifying agents and detergents to

remove grease and petroleum products. The formulation must be compatible with

the system components.

�� Biocides: Two alternate non-oxidizing micro-biocides with different kill

mechanisms.

�� Closed- Loop, Water piping Chemicals: Contain sequestering agents to reduce

deposits, chemicals to adjust pH , and corrosion inhibitors to protect system

metals.

�� Heating Steam and Condensate Piping Chemicals: Liquid formulations to prevent

deposits, adjust pH and alkalinity, scavenge oxygen, and protect condensate

system components.

�� Open-Loop, Condenser Water Piping Chemicals: Deposit dispersants and

penetrants to inhibit scaling, corrosion inhibitors, and micro-biocides.

3.02 EXECUTION

A. WATER ANALYSIS

Perform an analysis of supply water to determine the type and quantities of chemical

treatment needed to protect from corrosion, deposition, and fouling.

B. Installation

Install treatment equipment level and plumb.

Perform chemical cleaning as recommended by the water treatment supplier. The water

treatment supplier must test and certify in writing that the systems are clean and free of

organic and inorganic contaminants.

3.03 FIELD QUALITY CONTROL

Engage a water treatment service representative to perform startup service.

Inspect field- assembled components and equipment installation, including piping and

electrical connections. Report results in writing.

Inspect piping and equipment to determine that systems and equipment have been

thoroughly chemically cleaned, rinsed, and filled with water, and are fully operational

before introducing chemicals for water treatment system.

Place HVAC water treatment system into operation and calibrate controls during the

preliminary phase of HVAC systems startup procedures.

Test chemical feed piping as follows:

�� Do not enclose, cover, or put piping into operation until it is tested and

satisfactory test results are achieved.

�� Test for leaks and defects. If testing is performed in segments, submit separate

report for each test, complete with diagram of portion of piping tested.

NC STATE University Construction Guidelines

15189 HVAC Water Treatment

Rev 0 – 07/26/04 Page 4 of 4

�� Leave uncovered and unconcealed new, altered, extended, and replaced water

piping until it has been tested and approved. Expose work that has been covered

or concealed before it has been tested and approved.

�� Cap and subject piping to static water pressure of 50 psig above operating

pressure, without exceeding pressure rating of piping system materials. Isolate

test source and allow test pressure to stand for four hours. Leaks and loss in test

pressure constitute defects.

�� Repair leaks and defects with new materials and retest piping until satisfactory

results are obtained.

�� Prepare test reports, including require corrective action.

3.04 DEMONSTRATION

A. Engage a qualified water treatment service representative to train owner's

maintenance personnel to adjust, operate, and maintain HVAC water treatment systems

and equipment.

B. Furnish a one-year service program by a qualified service person, performing

service on a full-time basis. Service calls will be scheduled on a twice a month schedule

coordinate with the University as to the day of the month that service will be performed.

Upon arriving on campus, the service person will contact the University representative.

Upon completion of the service call, a copy of the service report shall be given to the

University's representative. Response to emergency service calls shall be less than 24

hours. The University shall make the equipment available/ accessible to the service

person so as not to cause delays.

C. Train Owner's maintenance personnel on procedures and schedules for starting

and stopping troubleshooting, servicing, and maintaining equipment and schedules.

D. Review manufacturer's safety date sheets for handling of chemicals.

E. Schedule at least 8 hours of training with Owner with at least seven days'

advance notice.