Canada - Purging and Cleaning of Glycol Heating Systems

Description

SECTION 2: PERFORMANCE SPECIFICATIONS - PURGING AND CLEANING A SYSTEM OF
GLYCOL HEATING

1 . Codes and permits

. 1 All work must be done in accordance with the following codes:

- Chapter III - Plumbing of the Quebec Construction Code.
- the Quebec Construction Code, Chapter I.
- the installation code for pressure vessels and equipment.
- the installation code for oil-burning appliances.


2 . Nature of the work

. 1 The heating contractor must provide the material, labour, tools and everything else necessary for the
completion of the following work, but not limited to:

- Purging and cleaning an existing glycol heating system.
- Recovery and handling of the existing glycol solution according to environmental standards.
- Applicable pressure and leak tests.
- Investigation and repair of leaks detected on the existing network.
- Filling and starting and restarting the network.

. 2 This contract includes the proper operation of the heating system including all the accessories required for its perfect operation; all in accordance with the standards, laws and regulations in force and in accordance with the rules of the art and crafts concerned, as well as the specific conditions of each of the trades concerned.

. 3 The contractor shall also provide all work and accessories not specified in the specifications but necessary for the installation and proper operation of the heating system.

. 4 It is the contractor's responsibility to review the plans available to him or to visit the site before submitting his price. No claim for ignorance of site conditions will be accepted.


3 . Descaling, cleaning, water treatment of the existing and new heating network

3 . 1 Bidding procedures

. 1 Shop drawings: Indicate the system diagram, piping configuration and required electrical connections and fittings.

. 2 Product data: indicate chemical processing equipment, chemicals and materials including required electrical characteristics and connections.

. 3 Manufacturer's reports: indicate the start-up of treatment systems once they are in place and operating properly. Indicate the analysis of the system water after cleaning and treatment.

. 4 Delivery, storage and handling: deliver, store and handle in accordance with the manufacturer's written instructions



3 . 2 Operating and maintenance data

. 1 Operation and maintenance data: Include data on chemical feed pumps, agitators and other equipment, including spare parts lists, procedures and treatment programs. Include detailed instructions on testing procedures, including concentrations.

3 . 3 Maintenance services

. 1 Do not include maintenance services, these will be done by the owner.

3 . 4 Equipment

. 1 Provide a sufficient quantity of descaling, cleaning and treatment chemicals for system start-up. Provide analytical reports certifying that corrosion inhibitor and glycol concentrations are in accordance with plans and specifications.

3 . 5 Qualifications

. 1 Manufacturer: A company specializing in the manufacture of the products specified in this section with a minimum of ten years of documented experience. The company must have local representatives, water analysis laboratories and full-time service personnel.

3 . 6 Acceptance standard

. 1 Chem-aqua or approved equivalent.

3 . 7 Products

. 1 chemical products for descaling, cleaning and water treatment for hot water heating, cooled water and glycol networks:

Q ua tic series 6160
Cleaning agent: monoammonium citrate, citric acid

MB - 2 15
B i o ci d e: magnesium nitrate, chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one

C he m - aq ua 11000
Chemical cleaning agents: tripotassium phosphate, 2-phosphonobutane-1,2,4-tricarboxylic acid, potassium salt, 2-phosphonobutane-1,2,4-tricarboxylic acid, potassium salt, tetrapotassium pyrophosphate

. 2 Water treatment chemicals for hot water heating, chilled water and glycol systems.

C he m - aq ua 61502
Cleaning agents: sodium tripolyphosphate, alcohols, c9-11, ethoxylated, alkyl dimethyl benzyl ammonium chloride (c12-18), sodium hydroxide.

C he m - aq ua 888
In corrosion inhibitors: sodium molybdate, sodium tolyltriazole
In scale hibitor: terpolymer
Buffer for ph : borate






3 . 8 Preparation

. 1 Install temporary bag filters on existing and new networks to be cleaned with the suction of pumps used for cleaning. Do not use pumps from building systems, use temporary pumps for cleaning. The contractor will have to make the necessary connections on the piping to clean the networks, even if they are not shown on the plans. Circulate water through existing and new systems for 24 hours and replace the bag filter according to clogging. Pressure gauges must be mounted on pocket filters to allow the detection of any clogging.

. 2 Install all equipment in accordance with the requirements indicated on the detailed drawing.

. 3 Systems must be switched on, filled, started and ventilated before cleaning. Use the water meter to record the capacity of each system.

. 4 Place the terminal control valves in the open position during cleaning.

. 5 Check that the electricity supply is available and adequate.

3 . 9 Descaling and cleaning procedures for existing networks kept

1 . Addition of iron dispersant 6160 at a rate of 7 to 10% of the volume (see with the representative).

2 . Allow to circulate for at least 2 days at 140°F. Do not use the new pumps to circulate water during cleaning.

3 . Purge until the conductivity is comparable to that of city water. Several rinses may be required.

4 . Repeat step 1 to 3 in the case of a network with a high deposition rate.

5 . Fill the network with fresh water and inject biocide Mb-215 (quantity according to the recommendations of the water treatment specialist) and Chem-aqua 11000 to pass through the network (1 Gal. per 1000 usg).

6 . Allow to circulate for 3 days. Purge and flush the network.

3 . 10 Preliminary cleaning and passivation procedures for new networks

. 1 Purge and drain systems to remove all debris.

. 2 Fill and allow full flow through all pipes.

. 3 Add Chem-aqua 61502, concentration as recommended by the Chem-aqua representative in the system water and allow to circulate without charge for at least 24 hours.

. 4 Drain the system thoroughly and monitor the purging process according to Chem-aqua's recommendations.

. 5 Verify that the purge is completed and recorded in a report.


3 . 11 Water treatment and glycol from existing and new networks

. 1 Fill the network with a new glycol solution:

- The glycol will be such as an industrial heat transfer fluid based on ethylene glycol of 42% and 58% water. It must be specially manufactured for heating and air conditioning systems.

- The product must contain corrosion inhibitors (5%) to minimize the corrosive effect of water and glycol on metal surfaces.

- The dilution of the heat transfer fluid must be made with good quality water (distilled or deionized). Use factory pre-mixed product only.

- Acceptable products: solar i (ethylene glycol) distributed by Enersol Inc.


3 . 12 Cleaning of hydronic equipment

. 1 Once the cleaning is complete, the contractor must clean all screens and replace the cartridge filters.
( per new) of the feed reversals.

. 2 For pumps with magnetic rotor, when starting, if the motor is stopped due to overheating, clean the magnetic rotor to remove any ferrous particles that may have stuck to it by electromagnetic fields.


5 . Tests

. 1 The contractor shall, at his own expense, perform all required tests in the presence of the owner and shall notify him at least 24 hours in advance.


6 . Pressure test

. 1 All piping shall be tested in accordance with the Plumbing Code of the Province of Quebec and the Installation Code for Pressure Vessels and Equipment.

. 2 Produce reports attesting that pressure tests have been successfully completed before the systems are put into service. The reports must be signed by the contractor in charge of the tests.

. 3 The contractor will be responsible for providing existing equipment and labour to repair all leaks on existing copper piping.


7 . Addition of quality control tests

. 1 A random inspection (+/- 20% of the buildings) will be done by one of our technicians to validate that the work has been done in the right way.


8 . Inspection

. 1 A visual inspection must be done on our installed equipment to validate that there are no leaks in the systems and that everything is in good condition. A visual inspection report must be completed for each house and submitted to the KMHB manager.

Opportunity closing date

07 August 2019

Value of contract

to be confirmed