HomeMy WebLinkAbout15500.pdfUniversity of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 1 of 10 Rev. 0, 09/15/08
Issued for Construction
SECTION 15500 PIPING MATERIALS AND METHODS 1
2
3
INDEX PAGE 4
5
PART 1. - GENERAL ..................................................................................................................................... 1 6
1.1. GENERAL ................................................................................................................................... 1 7
1.2. DEFINITIONS ............................................................................................................................ 1 8
1.3. QUALITY ASSURANCE ........................................................................................................... 1 9
PART 2. - PRODUCTS ................................................................................................................................... 2 10
2.1. JOINING MATERIALS .............................................................................................................. 2 11
2.2. GENERAL PIPING SPECIALTIES ........................................................................................... 2 12
2.3. PIPE, TUBING, FITTINGS AND MATERIALS ....................................................................... 3 13
2.4. PIPING SYSTEM APPLICATIONS........................................................................................... 3 14
2.5. VALVES ..................................................................................................................................... 3 15
2.6. PIPING SUPPORTS .................................................................................................................... 4 16
PART 3. - EXECUTION ................................................................................................................................. 4 17
3.1. GENERAL ................................................................................................................................... 4 18
3.2. PIPING installation ...................................................................................................................... 5 19
3.3. PIPING QUALITY CONTROL .................................................................................................. 8 20
3.4. PIPING SYSTEM APPLICATIONS TABLE ........................................................................... 10 21
3.5. PIPING DATASHEETS ............................................................................................................ 10 22
23
24
PART 1. - GENERAL 25
26
1.1. GENERAL 27
28
This specification is for piping systems. Attached to this specifica tion are data sheets for the individual 29
piping systems and their components that will be required for the construction. Also attached is a piping 30
applications table that outlines all systems and their design parameters. 31
32
1.2. DEFINITIONS 33
34
Pipe sizes are Nominal Pipe Size (NPS). 35
36
Tube sizes are outside diameter (O.D.) tube size 37
38
1.3. QUALITY ASSURANCE 39
40
Regulatory Requirements: Comply with the provisions indicated in attached individual piping data sheets, 41
or as required under Part 2 - Products of this section. Submit welders' certificates where applicable for 42
piping material. 43
44
Welder's Qualifications: All welders shall be qualified in accordance with applicable code requirements. 45
Qualification shall be made in accordance with ASME B31.3, .9 and, if applicable, the ASME Boiler and 46
Pressure Vessel Code, Section IX, Welding and Brazing Qualifications or AWS B 2.1 Specification for 47
Welding Procedure and Performance Qualification. 48
49
Welding procedures and testing shall comply with the applicable ASME Standard B31 and The American 50
Welding Society, Welding Handbook. 51
52
Soldering and brazing procedures shall conform to ASHRAE 15 Safety Standard for Refrigeration 53
Systems. 54
55
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 2 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
American Society of Mechanical Engineers (ASME) Compliance : Comply with ASME B31.9 for building 1
services piping, ASME B31.5 for refrigeration piping, ASME B31.3 for process piping, and ASME B31.1 2
for power piping. 3
4
Manufacturers Standardization Society of the Valve and Fittings Industry (MSS) Compliance : Comply 5
with the various MSS Standard Practices referenced. 6
7
Valve Identification: Provide valves with manufacturer's name and pressure rating clearly marked on valve 8
body. 9
10
11
PART 2. - PRODUCTS 12
13
All materials to be incorporated into permanent piping systems shall be new, unused, and undamaged 14
unless otherwise specifically permitted in the specifications. 15
16
Model numbers provided in the piping datasheets are for guidance only and are subject to change by 17
vendors. Contractor to submit valves and components based on t he verbiage of the specification body and 18
not necessarily the model numbers provided. 19
20
2.1. JOINING MATERIALS 21
22
Welding Materials 23
24
Comply with Section II, Part C, ASME Boiler and Pressure Vessel Code for welding materials appropriate 25
for the wall thickness and chemical analysis of the pipe being welded. 26
27
Brazing and Soldering Materials 28
29
Refer to individual piping system specifications for brazing and soldering materials appropriate for each 30
respective system. 31
32
Gaskets for Joints 33
34
Refer to individual piping system specifications for appropriate gasket for each respective system. 35
Materials are specified to suit the chemical and thermal conditions of the fluid of the piping system in 36
which installed, which conform to ASME Standard B16.21, and which are totally non-asbestos. 37
38
Bolting 39
40
Refer to individual piping system specifications for appropriate bolting for each respective system. 41
42
Bolting for stainless steel flanges shall be of the same material as the flanges for which they will be used, 43
including all washers and nuts. 44
45
Provide copper based anti-seize compound for nuts and bolts of carbon steel systems. 46
47
2.2. GENERAL PIPING SPECIALTIES 48
49
Refer to other specifications for pipe specialty components. 50
51
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 3 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
1
2.3. PIPE, TUBING, FITTINGS AND MATERIALS 2
3
Refer to the attached table and piping datasheets for pipe specifications indicated on the drawings, or 4
referenced in other specifications. 5
6
2.4. PIPING SYSTEM APPLICATIONS 7
8
Refer to the attached table and piping datasheets for the piping materials to be used for each system, which 9
also correspond to the piping systems indicated on the drawings. 10
11
2.5. VALVES 12
13
General 14
15
Valves shall be suitable for the pressure and temperature ratings of the piping systems in which they wil l be 16
installed. Valves shall be sized to match upstream piping, unless indicated otherwise. Where insulation is 17
indicated or required on piping systems, provide extended valve stems (except for diaphragm valves) 18
arranged to receive insulation. 19
20
Valve bypass and drain connections shall comply with MSS SP-45, unless indicated or specified otherwise. 21
22
Valve end connections shall be as indicated in this specification pipe datasheet or on the drawings. The end 23
connections specified shall comply with the following standards: 24
25
Threaded: Comply with ASME B1.20.1 26
Flanged: Comply with ASME B16.1 for cast iron, ASME B16.5 for steel, and ASME B16.24 for 27
bronze valves. 28
Ferrule: Comply with ASME BPE-Latest Edition. 29
Solder Joints: Comply with ASME B16.18 30
Caution: Where soldered end connections are specified, a solder having a melting point less than 31
840°F shall be used for gate, globe, and check valves, and less than 421°F for ball valves. 32
33
Operators: Provide for non-critical manual valves the following special operator features: 34
35
Non-rising stem valves may be used where headroom prevents full extension of rising stems. 36
37
Hand wheels, fastened to valve stem, for valves other than quarter turn. 38
Lever handles, on quarter-turn valves 6" and smaller, except for plug valves. 39
Provide plug valves with square heads; provide one wrench for every 10 -plug valves. 40
Chain-wheel operators, for valves 2 -1/2" and larger, installed 96" or higher above finished floor 41
elevation. Extend chains to an elevation of 5'-0" above finished floor or platform elevation. This 42
does not apply to skid equipment, module equipment, or critical systems unless indicated on the 43
drawings. 44
Gear drive operators, on quarter-turn valves 8" and larger. This does not apply to skid equipment, 45
module equipment, or critical systems unless indicated on the drawings. 46
47
Valve Selection 48
49
Type of valves to be used are (e.g., diaphragm, ball, gate, plug, butterfly, etc.) indicated on the drawings. 50
Where such indication is not provided, nor indicated elsewhere in this or a ttached specifications, the 51
following valves shall be used for specific systems: 52
53
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 4 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
1
Ball Valves: Gas system piping (A, IA, etc.); 2
o Hydronic system piping 2” and smaller 3
Gate Valves: Plant steam and condensate system piping 4
Globe Valves: Throttling and control valves for all plant steam and hydronic system piping 5
Plug Valves: Natural gas system piping 6
Butterfly Valves: Hydronic system piping greater than 2" 7
8
2.6. PIPING SUPPORTS 9
10
Provide pipe hangers and supports as indicated in Specification 15140, Hangers and Supports. 11
12
13
PART 3. - EXECUTION 14
15
3.1. GENERAL 16
17
Piping Arrangement 18
19
Route piping at right angles or parallel to the skid, module, or building structure, free of sags or bends, and 20
grouped together wherever possible. Locate groups of pipes parallel to each other, spaced to permit 21
applying full insulation and servicing of valves. 22
23
Arrange piping to allow for ease of access to components that will be serviced regularly as part of the 24
intended operation of the equipment, including the removal of filter housings and the calibration of 25
instrumentation. 26
27
Arrange supports and piping directional changes to allow for thermal expansion in the piping systems due 28
to normal temperature changes. Avoid creating, even temporarily, und ue loads, forces, or strains on valves, 29
instrumentation, equipment connections, supports, structural framing, or building components caused by 30
piping connections or supports. 31
32
Provide equipment connections with sanitary clamps, compression end, flanged, or threaded connections, 33
unless otherwise indicated, to allow for complete removal of the equipment without disruption of the 34
connected piping system. 35
36
Install drains at low points in piping mains, risers, and branch lines consisting of valve types per secti on 2.5 37
of this specification and the system datasheets. Provide caps at ends of valves. 38
39
Install air vents at high points of hydronic systems for system air venting, unless otherwise specified. 40
41
Install final piping, unions, and flanges at connections to all equipment and fixtures in such a manner that 42
will permit the complete removal of any fixtures or components, such as coils, tube bundles, or filters 43
without cutting pipe lines. 44
45
Install sensor and other control devices in piping systems where indicated on the drawings. 46
47
P&ID Drawings 48
49
When Process and Instrumentation Diagrams are provided, they shall be adhered to as much as feasible, as 50
they indicate the desired relative locations of piping components and flow paths to achieve the proper 51
process operations. 52
53
54
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 5 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
Construction Floor Plan Drawings 1
2
When Construction Document Floor Plan Drawings are provided, they indicate the general location and 3
arrangement of the piping systems. Location and arrangement of piping layout take into consideration pipe 4
sizing and friction loss, expansion, pump sizing, and other design considerations. To the extent it is 5
practical, install piping as indicated. Refer to piping data sheets, piping applications table and other 6
specifications for additional requirements and for coordination of drawing submittals. Diagonal runs are 7
not permitted, unless expressly indicated on the drawings. 8
9
Conceal all pipe installations in walls, pipe chases, utility spaces, above ceilings, below grade or floors, 10
unless indicated otherwise while maintaining accessibility to piping components that require maintenance 11
or inspection. 12
13
Allow sufficient space above removable ceiling panels to allow for panel removal. 14
15
3.2. PIPING INSTALLATION 16
17
Preparation 18
19
Ream ends of pipes and tubes, and remove burrs. Bevel plain ends of steel pipe. 20
21
Remove scale, slag, dirt, and debris from both inside and outside of piping, tubing, and fittings before 22
assembly. 23
24
Keep all openings in equipment closed during construction, except when actual work is being p erformed on 25
that item or system. 26
27
Drill and deburr all openings for vents, drains, instruments, and other similar connections, which are made 28
after erection of the piping system. 29
30
Fittings 31
32
Make reductions in pipe sizes in horizontal lines using eccentric reducer fittings installed with the straight 33
side down unless indicated otherwise. Reducer orientation must meet/exceed slope criteria. Low point of 34
reducer shall be fully drainable. Vertical lines shall use concentric reducer fittings. 35
36
Use fittings for all changes in direction and all branch connections except where bending is specifically 37
allowed by the specification. Use long radius elbows unless indicated otherwise. 38
39
Branch Take-Offs 40
41
Liquids: Take-off from top, bottom, or side of mains or headers at either 45° or 90° from horizontal plane. 42
Gases: Take-off from top of mains or headers at either 45° or 90° from horizontal plane. 43
Steam: Take off from top of mains at either 45° or 90° from horizontal plane, or as indicated on the 44
drawings. Take off at 45° from horizontal plane is preferred. 45
46
Refer to branch connection tables associated with individual piping system data sheets attached. 47
48
Connections 49
50
General 51
52
Refer to individual piping system data sheets and as indicated above in Part 2 - Products of this section. 53
54
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 6 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
Welded 1
2
Weld pipe joints in accordance with the appropriate ASME B31 Piping Code. Weld pipe joints of exterior 3
water service pipe in accordance with AWWA C206. Remake leaking joints using new materials. Heat 4
sensitive materials such as gaskets, seals, and seats shall be removed from components prior to welding to 5
prevent damage. 6
7
Brazed and Soldered 8
9
Brazed and soldered joints for copper tube and fittings shall be in accordance with the appropriate ASME 10
B31 Piping Code. 11
12
Thoroughly clean tube surface and inside surface of the cup of the fittings, using very fine emery cloth, and 13
prior to making soldered or brazed joints. Wipe tube and fittings clean and apply flux. Flux shall not be 14
used as the sole means for cleaning tube and fitting s urfaces. 15
16
Valves shall be in full open position. Avoid hot spots or overheating the valve. Heat sensitive materials 17
such as gaskets, seals, and seats shall be removed from components prior to soldering to prevent damage. 18
19
Threaded 20
21
Note the internal length of threads in valve ends, and proximity of valve internal seat or wall, to determine 22
how far pipe should be threaded into valve. 23
24
Thread pipe with tapered pipe threads in accordance with ASME B1.20.1. Cut threads full and clean using 25
sharp dies. Ream threaded ends to remove burrs and restore full inside diameter. 26
27
Apply appropriate process service compatible teflon tape or thread compound to external pipe threads 28
(except where dry seal threading is specified). 29
30
Align threads at point of assembly. Assemble joint, wrench tight. Wrench on valve shall be on the valve 31
end into which the pipe is being threaded. 32
33
Flanged 34
35
Weld pipe flanges to pipe ends in accordance with the appropriate ASME B31 Piping Code. Allowance 36
shall be made for shrinkage during welding of nozzle connections so that the stress on equipment is 37
minimized. Clean flange faces and install gaskets. 38
39
Align flange surfaces parallel. Use suitable lubricants on bolt threads. 40
41
Assemble joints by sequencing bolt tightening to make initial co ntact of flanges and gaskets as flat and 42
parallel as possible. Tighten bolts gradually to uniformly compress the gaskets and minimize flange stress. 43
Use a calibrated torque wrench to tighten flange and flange bolts to torque specified by manufacturer. 44
45
Install flanges in piping 2-1/2" and larger where indicated on the drawings, adjacent to each valve, and at 46
the final connection to each piece of equipment. 47
48
Unions 49
50
Install unions in piping 2" and smaller where indicated on the drawings, adjacent to each valve, and at the 51
final connection to each piece of equipment. 52
53
54
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 7 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
Valves 1
2
Locate valves for easy access and provide separate support where necessary. Install valves in horizontal 3
piping with stem at or above the center of the pipe, when possible. In all cases install valve to allow for 4
easy access for operation. Install valves in a position to allow full stem movement. Protect valves that will 5
be welded, soldered or brazed into piping systems from heat damage. 6
7
Install valves and unions for each fixture and equipment item arranged to allow equipment removal without 8
system shut down. A union connection shall be installed as close as possible to each screwed or soldered 9
end valve. 10
11
Install check valves for proper direction of flow and located to ensure that the valve will close freely and 12
positively by gravity. Allow a minimum of five pipe diameters upstream of check valves to minimize 13
chatter and to extend valve life. 14
15
Wafer Check & Duo Check Valves: Horizontal or vertical position, between flanges. 16
17
Lift Check Valve: With stem upright and plumb. 18
19
Dielectric Unions 20
21
Provide dielectric unions with appropriate end connections for the pipe materials in which installed 22
(screwed, soldered, or flanged), which effectively isolate dissimilar metals, prevent galvanic action, and 23
stop corrosion. Dielectric unions are not required for joining stainless steel to carbon steel. 24
25
Strainers 26
27
Refer to hydronic or steam specialties specifications for appropriate strainers for each respective system. 28
29
Provide strainers with ends matching piping system materials. An arrow indicating direction of flow shall 30
be permanently stamped or cast into the strainer body. 31
32
Provide each strainer with threaded nipple and ball valve (brass or bronze for carbon steel strainers, 33
stainless steel for stainless steel strainers) in the blowdown port. Provide a male hose end fitting after 34
blowdown valve if not piped to drain. 35
36
Steam and Condensate Piping Installation 37
38
Install steam supply piping at a uniform grade of 1/4" in ten feet do wnward in the direction of flow, unless 39
otherwise indicated. Install condensate return piping at a uniform grade of 1/2" in ten feet downward in the 40
direction of flow, unless indicated otherwise. 41
42
Install drip legs at low points and natural drainage points in the system, such as at the bottoms of risers, 43
ends of mains, and ahead of pressure regulators, control valves, isolation valves, pipe bends, and expansion 44
joints. On straight runs with no natural drainage points, install drip legs at intervals not exceeding 200 feet 45
where pipe is pitched down in the direction of the steam flow and a maximum of 150 feet where the pipe is 46
pitched up so that condensate flow is opposite of steam flow. 47
48
Size drip legs at vertical risers full size and extend beyond the rise. Size drip legs at other locations same 49
diameter as the main. Provide an 18" drip leg for steam mains smaller than 6". In steam mains 6" and 50
larger, provide drip legs sized 2 pipe sizes smaller than the main, but not less than 4". 51
52
Strainers shall be installed upstream of all control valves and steam traps. Strainers shall be oriented with 53
both flow and blow down branches horizontal and level. 54
55
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 8 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
3.3. PIPING QUALITY CONTROL 1
2
Pressure Testing 3
4
General 5
6
After the completion of all welding, fabrication operations, all piping systems shall be pressure tested using 7
the test procedure as indicated within the attached pipe table and as specified herein. No testing shall be 8
performed without being witnessed by the Owner or the Owner’s representative and the contractor shall be 9
responsible for notifying all party’s 48 hours in advance of the test. All testing procedures shall be 10
approved by the owner prior to the start of the testing procedure. 11
12
Joints shall be un-insulated and exposed for examination during tests. Equipment, instruments and 13
components that are not rated for the test pressure shall be isolated from the piping system during pressure 14
tests. If a valve is used to isolate components, its closure shall be capable of sealing against the test 15
pressure without damage to the isolated component. 16
17
Provide temporary restraints for expansion joints which cannot sustain the reactions due to test pressure. If 18
temporary restraints are not practical, isolate expansion joints from testing. 19
20
Joints at which blinds are inserted to isolate equipment need not be tested. 21
22
In each system to be tested, install relief valves set at a pressure of no more than 1/3 higher than the test 23
pressure to protect against damage by expansion of liquid or other source of overpressure during the test. 24
25
Refer to Piping System Applications Table for type of fluid to be used as the pressure testing medium. 26
Compressed air and/or nitrogen for all pneumatic pressure tests shall be hydrocarbon and moisture free. 27
28
Contractor shall provide a temporary test pump, storage tank and other accessories as required to achieve 29
the test pressures specified where not available on site. 30
31
Soap solutions utilized for visual examination of pneumatically pressure tested piping systems shall be a 32
commercial preparation made specifically for leak detection. 33
34
Test Pressures 35
36
Refer to the attached piping system applications table for the piping system test pressure to be used. Where 37
not indicated, hydrostatic test pressures shall be 150% of th e operating pressure but not less than 100 psig 38
and at least 50 psig greater than the operating pressure, and pneumatic test pressures shall be 12 5% of the 39
operating pressure. 40
41
Test Acceptance 42
43
A test will be considered acceptable when all of the conditions of this specification have been met and the 44
test pressure does not result in a change of more than 2.0% during the stated test duration. Final pneumatic 45
test pressures shall be compensated for variations in temperature. It is required that an Owner d esignated 46
representative be present to witness and sign for test acceptance . 47
48
Provide pressure test documentation including: 49
50
Date of test 51
Identification of piping system tested 52
Test fluid 53
Test pressure 54
Test results 55
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 9 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
1
Hydrostatic Testing Procedure 2
3
1. Fill the piping system with appropriate water from a storage tank or other approved source. 4
Owner or Owner's representative shall approve water quality and source for use with hydrostatic 5
pressure tests. 6
7
2. Bleed the system of air or nitrogen. 8
9
3. Circulate the water through the system using a circulating pump for a period of not less than one 10
hour. 11
12
4. Inspect all piping for leaks during circulation of water. 13
14
5. Slowly close a temporary valve on the discharge side of the piping system. 15
16
6. When the test pressure is obtained at the discharge of the pump, the pump shall be shut down and 17
the discharge valve closed. If the circulation pump is not capable of producing the test pressure 18
required for the piping system, provisions shall be made for pressurizing the water filled sys tem 19
with particulate, moisture and oil free air or nitrogen gas. 20
21
7. Leaks shall be marked and repaired according to the joining methods specified for the piping 22
system being tested. 23
24
8. After leaks are repaired, the entire system shall be tested again as specified above. 25
26
9. Repeat test procedure until the system is proven tight at test pressure to the satisfaction of the 27
Owner or Owner's Representative. 28
29
10. Hydrostatic test pressure shall be maintained for a sufficient length of time to visually determine 30
whether there are any leaks, but not less than 1 hour. The Contractor shall not be required to 31
maintain test pressure in excess of 2 hours after notification of the Owner’s authorized inspector. 32
33
11. If start up is not scheduled to occur within 12 hours after hydrostati c testing, the system shall be 34
completely drained and purged with clean, filtered oil-free, dry air. 35
36
Pneumatic Testing Procedure 37
38
1. Clear the test area of non-essential personnel before bringing the line pressure up to test pressure. 39
The contractor shall take whatever precautions deemed necessary to protect workers and personnel 40
during pneumatic testing. 41
42
2. A pressure relief device shall be provided, having a set pressure not higher than the test pressure 43
plus the lesser of 50 psig or 10% of the test press ure. 44
45
3. A double block and bleed valve arrangement shall be included in the pressurizing line to the 46
system being tested. A test gauge shall be located downstream of the double block valve 47
assembly. 48
49
4. When pneumatic testing over 25 psig, a preliminary chec k at 25 psig shall be made to locate major 50
leaks. Examination of the system may be visual or audible. Visual examinations shall utilize a 51
soap solution in order to detect the leakage. 52
53
5. After the preliminary check, the test pressure shall be increased in steps of 25 psig. If after a 10-54
minute period the pressure is held, proceed to the next pressure. 55
University of North Carolina at Chapel Hill CRB Consulting Engineers, Inc.
Research Resource Facility, Building 3 – Canine Facility RECORD SPECIFICATIONS
SCO ID# 01-05442-02B
CRB Job No. 076670.00 15500 - 10 of 10 Piping Materials and Methods
Rev. 0, 09/15/08
Issued for Construction
1
6. If the pressure is not held, examine the entire system for leakage. Examination of the system shall 2
be visual utilizing a soap solution to detect the leakage. All leaks found shall be marked and 3
repaired after first depressurizing the line. After leaks have been repaired, the pressure test shall 4
be repeated. All leaks which have been repaired shall be visually reexamined, with soap, to assure 5
proper repair. 6
7
7. After the system has been successfully brought up to the test pressure, the pressure shall then be 8
held for a 10-minute period. After this period, the pressure shall be reduced to the design pressure 9
and held for a duration of 24 hours. 10
11
8. Bolting shall not be tightened while systems are being tested above 30 psig. 12
13
Flushing and Cleaning 14
15
General 16
17
Clean and flush piping systems. Remove, clean, and replace strainer screens prior to balancing or 18
commissioning. 19
20
Clean mill scale, grease, and protective coatings from exterior of valves and prepare valves to receive finish 21
painting or insulation. 22
23
Preparation 24
25
Refer to Piping System Applications Table for type of fluid to be used. 26
27
For gas piping systems, hydrocarbon and moisture free air or nitroge n of at least a quality of the Owner’s 28
point of use shall be used to purge system. 29
30
3.4. PIPING SYSTEM APPLICATIONS TABLE 31
32
The attached table indicates the piping material data sheet to be used for each system, applicable code, 33
system service type, design pressure, operating pressure and temperatures, test pressures and cleaning 34
procedures. 35
36
3.5. PIPING DATASHEETS 37
38
Specifications for these piping materials are attached to this specification in datasheet format. 39
40
41
END OF SECTION 42