OBO Int Code Supplement (OBO-ICS) (Plumbing Code Chapter 6).pdf

2020 OBO PLUMBING CODE UNCLASSIFIED WATER SUPPLY AND DISTRIBUTION

Chapter 6

OBO-ICS 2020 OBO-International Codes Supplements JANUARY 2020 Amendments to the International Plumbing Code United States Department of State UNCLASSIFIED IPC 6 - 1

CHAPTER 6

WATER SUPPLY AND DISTRIBUTION

SECTION 601

GENERAL

Delete the subsection and replace with the following:

601.4 Tests. Refer to Section 312 and OBO-ICS IZC Section 811.

SECTION 602

WATER REQUIRED

Delete the subsection and replace with the following:

602.3 Water supplies from wells. Refer to OBO-ICS IZC Section 811.

Add the following subsection to 602.3.2:

1. Water quantity and pressure analysis. Sources for potable water shall be analyzed to evaluate if reliability is sufficient for the water quantity and pressure identified in OBO-ICS IPC Section 614 and OBO-ICS IFC Section 507.

Refer to OBO-ICS IPC Section 312 for the associated test requirements.

Add the following subsection to 602.3.3:

1. Water quality analysis. Refer to OBO-ICS IPC Section 312 for the associated test requirements.

SECTION 603

WATER SERVICE

Delete the first sentence and replace with the following:

603.1 Size of water service pipe. The water service pipe, consisting of the pipe from the potable water storage tank to, and including the compound potable water distribution loop, shall be sized to supply water to each structure in the quantities and at the pressures required in the OBO Plumbing Code.

Delete the paragraph and replace with the following:

603.2 Separation of water service and site sanitary conveyance. Water service and site sanitary conveyance pipe shall have a minimum horizontal separation of 3 meters. Water service pipe is not permitted to be located in the same trench as any site sanitary pipe. Refer to OBO-ICS IZC Section 811 for additional requirements.

SECTION 604

DESIGN OF BUILDING WATER DISTRIBUTION SYSTEM

Delete the subsection and replace with the following:

United States Department of State UNCLASSIFIED IPC 6 - 2

604.1 General. The design of the water distribution system shall conform to accepted U.S. engineering practice. Methods utilized to determine pipe sizes shall be approved.

Delete the fixture flow rate in the table below and replace with the following, with no change to other rates:

TABLE 604.4

MAXIMUM FLOW RATES AND CONSUMPTION

FOR PLUMBING FIXTURES AND FIXTURE FITTINGS.

PLUMBING FIXTURE OR

FIXTURE FITTING

MAXIMUM FLOW RATE OR

QUANTITY

Urinal Ultra-low-flow: 0.473 liters per flush;

waterless urinals are not permitted

Water Closet 4.8 liters per flush

Add the following to the end of the paragraph:

604.7 Inadequate water pressure. Boost water system pressures to a minimum of 275 kPa and a maximum of 400 kPa provided that at the farthest point and/or the highest point in the water system, a minimum pressure of 172 kPa (25 psi) at peak flow (non-fire-protection demand) is maintained.

United States Department of State UNCLASSIFIED IPC 6 - 3

SECTION 605

MATERIALS, JOINTS AND CONNECTIONS

Revise Tables 605.4 Water Distribution Pipe and Table 605.5 Pipe Fittings to reference the following acceptable materials:

TABLE 605.4 AND TABLE 605.4 WATER DISTRIBUTION PIPE AND PIPE FITTINGS

Application Nominal Diameter (Nominal Pipe Size)

Material Fittings Joints

Water Distribution Pipe and Fittings*

All Type K or L**, seamless copper tube ASTM B88/B88M

Cast copper ASME B16.18** or Wrought copper ASME B16.22

Soldered or Brazed

All Type K or L**, seamless copper tube ASTM B88/B88M

ASTM B75/B75M C12200 or

ASTM B152/B152M C1100

and ASME B16.22** for wrought copper; or per

ASTM B584 copper alloy CDA 836 per ASME B16.18 for cast copper

Roll-groove

All Type K or L**, seamless copper tube ASTM B88/B88M

ASME B16.51

with EPDM sealing element, 1379 kPa (200 psi)

Dual-crimp press-connect

DN 15 (NPS 1/2) thru DN

100 (NPS 4)

Sch. 40 stainless steel, 304, 304L,316 or 316L, ASTM A312 p i p e or ASTM A554 tubing

Stainless steel 304, 304L, 316, or 316L with EPDM sealing element, 1379 kPa (200 psi), ASTM A312 pipe or ASTM A554 tubing

Dual-crimp press-connect

All Sch. 40 stainless steel, 304, 304L, 316, or 316L, ASTM A312 pipe or ASTM A554 tubing

Wrought austenitic stainless steel ASTM A403

Butt or socket welded

All Sch. 40 Chlorinated Polyvinyl Chloride (CPVC) plastic pipe and tubing***; ASTM D2846/D2846M or ASTM

F441/F441M (Sch 40 and 80) or ASTM F442/F442M (SDR-

PR) or CSA B137.6

ASSE 1061 or ASTM D2846/D2846M or ASTM F437 or ASTM F438 (Sch

40) or ASTM F439 (Sch 80) or CSA B137.6

Solvent cement

ASTM F493

Notes

* This table limits materials to be used for water distribution pipe and pipe fittings in Model IPC Tables 605.4 and 605.5. Other piping materials and fittings may be allowed on a project-specific basis, when approved in writing by OBO/PDCS/DE/ME. All pipes and fittings shall be NSF 61 and NSF 372 certified.

** Neither Type L nor cast ASME B16.18 fittings permitted below-ground or in concrete slab.

*** Only allowed in certain areas or transition applications as approved by OBO/PDCS/DE/ME

Add the following to the end of the paragraph:

605.7 Valves. Refer to OBO-ICS IZC Section 811 for valves on pipe associated with the site water distribution system.

United States Department of State UNCLASSIFIED IPC 6 - 4

SECTION 606

INSTALLATION OF THE BUILDING WATER DISTRIBUTION SYSTEM

Replace Subsection 606.1.4 with the following:

606.1.4 Valve locations. Provide full port ball valves on the base of every water riser, at each floor branch, and at each restroom group.

Insert the following subsections:

606.8 Gauges and instrumentation.

1. Provide non-mercury type pipe thermometers on entering and leaving of all water heaters and heat exchangers.

2. Provide pressure gauges on all inlet and outlets of all water heaters, tanks, and the suction and discharge of all pumps.

606.9 Meter. Provide turbine type meter with a total and instantaneous system flow measuring system, with each portion of the system capable of reporting to the central compound building automation system (BAS). The full system shall monitor the following:

A. Compound: Municipal supply and irrigation system.

B. Building - General: Each building shall be capable of reporting on hot water and potable water use to the central compound building automation system (BAS).

C. Office Buildings: Sub-meters indicating instantaneous and system flows outside of the CAA area shall be incorporated as a part of the building automation/control system.

SECTION 607

HOT WATER SUPPLY SYSTEM

Add the following to the end of the subsection:

607.1.2 Tempered water temperature control. Fixtures used for hand-washing shall limit the tempered water to a maximum of 43 degrees C.

607.1.3 Hot water temperature control. Hot water for laundry, culinary purposes, and building maintenance purposes shall be supplied to fixtures and equipment at a maximum of 49 degrees C. Refer to the International Plumbing Code Section 424 for protective shower/bathing faucet temperature requirements.

607.1.4 Dishwashing temperature. Dishwashing equipment shall have heating elements to increase their supplied temperature to 71 degrees C. Confirm required hot water temperature requirement with selected manufacturer.

Residential dishwashers shall comply with NSF-184.

SECTION 608

PROTECTION OF POTABLE WATER SUPPLY

Delete the subsection and replace with the following:

608.7.1 Water supplies from wells. Refer to OBO-ICS IZC Section 811.

Delete the subsection and replace with the following:

United States Department of State UNCLASSIFIED IPC 6 - 5

608.17.4 Connections to automatic fire sprinkler systems and standpipe systems. Refer to OBO-ICS IFC Chapter 9.

Add the following to the end of the paragraph:

608.17.5 Connections to irrigation systems. Refer to OBO-ICS IZC Section 811.

Delete the paragraph and replace with the following:

608.18 Protection of wells. Refer to OBO-ICS IZC Section 811.

Delete the subparagraph and replace with the following:

608.18.1 Well locations. Refer to OBO-ICS IZC Section 811.

SECTION 611

DRINKING WATER TREATMENT UNITS

Add the following to the end of the paragraph:

611.1 Design. If the source water for potable use does not conform to the National Primary Drinking Water Regulations, as well as secondary standards, the system shall be treated to bring that water into conformance with those standards.

1. The design shall address TTHM/DBP removal to less than 0.1 mg/L, Giardia Lambia/Cryptosporidium/Virus/ Coliform/Legionella inactivation, age of treated water to less than 3 days, Chlorine disinfectant residual of between

0.2 and 0.5 mg/L everywhere in the distribution system, and other relevant treatment design in accordance with AWWA Standards and Manuals of Water Supply Practices.

2. Where local water or well water has measured hardness level (Calcium Carbonate) of greater than 170 mg/L, provide water softening system to reduce hardness level to between 50 and 85 mg/L; with a positive Langelier Saturation Index. The magnesium hardness shall be less than 40 mg/L.

3. Reduce the turbitiy to less than 0.5 NTU.

4. Where possible, select physical, adsorption, or ion exchange processes rather than chemical adjustments to limit maintenance complexity.

Add the following section:

SECTION 614

RAW WATER INLET AND POTABLE WATER STORAGE TANKS

614.1 General.

1. Coatings. Tank coatings, including sealing compounds and other materials, shall be certified by NSF Standard No. 61.

2. Primary compound water equipment room. The primary compound domestic water pump(s) and fire pump(s) shall be located in room(s) adjacent to the general water storage tanks. As necessary, the Pump Room shall be provided with stairs and equipment support rail for maintenance personnel to access and service the equipment.

Water Treatment Equipment rooms plan at a scale no less than 1:50 shall be shown on the construction documents indicating adequate clearance and accessibility for maintenance and removal/replacement of all

United States Department of State UNCLASSIFIED IPC 6 - 6 equipment and components. Provide a utility sink, cabinets and counter top adjacent to the utility sink, to accommodate field water quality testing equipment and manuals, reagents, and operational log books.

614.2 Potable water storage. In new compound water supply systems, provide storage for post-treatment potable water.

1. Capacity. The potable water storage capacity shall be adequate to meet peak demand requirements, and shall be no less than the average daily demand.

2. Disinfection. Disinfection shall be maintained as required in section 611.1.1.

614.3 Raw water inlet tank. In new compound water supply systems, provide storage for raw water unless the adequacy and reliability of a back-up well water supply can be certified to meet the quality standards identified in Section 602.

614.3.1 Capacity. The raw water inlet tank shall provide seven day (168 hour) capacity for domestic use. Storage requirements for fire protection are separate; refer to OBO-ICS IFC Chapter 5.

614.3.2 Calculations. The raw water inlet tank capacity shall be based upon the greater of the following:

1. 200 liters/day per desk (based upon total desks as indicated on the project Space Requirements Program).

2. 378 liters/compound resident/day + 76 liters/employee/day + 38 liters/consular visitor/day.

614.3.3 Tank features. Each tank shall include the following features:

1. Level gauge.

2. Overflow drain.

3. Tank drain.

4. Means of access into tank for maintenance, including separate access for ventilation.

5. Circulation or mixing- sufficient to turn the tank over every 48 hours.

6. Disinfection to maintain the residual as required in section 611.1.1.

614.3.4 Tank protection and safety. Tanks shall comply with the following to minimize the possibility of contamination.

1. Vents and overflows shall be protected stainless steel screen to prevent entry by birds, insects and rodents.

2. Vents shall be rain-proofed by using goosenecks or vandal-proof vent caps.

3. Overflows and drainpipes shall have a check valve to prevent tampering with the water supply.

4. Overflows and drainpipes shall not be directly connected to sewers.

5. Top of manholes shall be set at a minimum of 150 mm above the higher of final grade or 100 year flood level.

6. Provide two manholes in the top of each tank, minimum of 1000mm by 1000 mm, for maintenance, ventilation and rescue access. Manholes shall be locked except when in use.

7. Provide additional 1000mm by 1000 mm manhole for confined space ventilation for tanks greater than 8 meters in length.

8. Pipe penetrations shall be protected by pipe sleeves against stormwater infiltration, fuel spillage, or other contamination to the higher elevation of 150 mm above grade or 50 mm above the 100 year flood level.

A. Provide waterproof seal between the pipe sleeve and tank.

B. Provide waterproof seal for the annular space between the pipe and sleeve.

9. Provide a hose bibb located in the vicinity of water tanks for maintenance activities inside tanks.

United States Department of State UNCLASSIFIED IPC 6 - 7

10. Provide electrical outlets with ground fault circuit protection located in the vicinity of water tanks for maintenance activities inside tanks.

614.4 Gravity tanks. Gravity tanks, sized for one-day nominal usage, may be used for residences and small buildings to provide a relatively constant distribution system pressure when the utility system pressure is inadequate or when utility system flow is periodic.

Exception. Gravity tanks are not permitted to be used on office compounds.

END OF CHAPTER IPC-6 AMENDMENTS