1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDecember 16, 20051SUBJECT 1821AOUTLINE OF INVESTIGATIONFORTHERMOPLASTIC SPRINKLER PIPE AND FITTINGS FOR LOW PRESSUREDRY PIPE APPLICATIONSIssue No: 1December 16, 2005Summary of TopicsThis is the F
2、irst issue of the Outline of Investigation for ThermoplasticSprinkler Pipe and Fittings for Low Pressure Dry Pipe Applications. Thisoutline covers thermoplastic pipe and fittings for use in low pressuredry pipe sprinkler systems for fire protection service.COPYRIGHT 2005 UNDERWRITERS LABORATORIES IN
3、C.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 16, 2005SUBJECT 1821A2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Units
4、 of Measurement .43 Glossary .4PERFORMANCE4 General 45 Fire Exposure Test 46 Impact Resistance Tests for Low Pressure Dry Systems .56.1 General .56.2 Impact with flat Tup .56.3 Impact with conical shaped tup .67 Temperature Cycling Test 8INSTRUCTIONS8 Installation and Design Manual .8DECEMBER 16, 20
5、05 SUBJECT 1821A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This Outline of Investigation covers thermoplastic pipe and fittings for use in low pressure dry pipesprinkler systems for fire protection service. In add
6、ition to the requirements in the Standard forThermoplastic Sprinkler Pipe and Fittings for Fire Protection Service, UL 1821, the following aresupplemental requirements that also apply to thermoplastic pipe and fittings for use in low pressure drypipe sprinkler systems.2 Units of Measurement2.1 Value
7、s stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.3 Glossary3.1 For the purpose of this outline, the following definitions apply.3.2 LOW PRESSURE DRY SYSTEMS A thermoplastic sprinkler piping system containingcompressed air or nitrogen h
8、aving a gage pressure not greater than 15 psig (103 kPa) intended for usein dry systems.3.3 MINIMUM RATED TEMPERATURE The lowest ambient temperature and associated pressurethat the pipe and fittings are intended to be exposed during use, as specified in the manufacturersdesign and installation instr
9、uctions.PERFORMANCE4 General4.1 Pipe and fitting assemblies representing the sizes, limitations and provisions contained in theinstallation and design manual, shall be subjected to the tests described in Sections57.5 Fire Exposure Test5.1 Pipe and fitting assemblies intended for installation in low
10、pressure dry systems without protectivematerials referenced in UL 1821, Section 13.1.1, shall comply with the Fire Exposure Tests described inthe Standard for Thermoplastic Sprinkler Pipe and Fittings for Fire Protection Service, UL 1821, Section13 except the piping shall be initially pressurized wi
11、th air at 15 +0/-1 psig, (103 +0/-7 kPa) and the watersupply to the piping shall be delayed for the time specified in Table 5.1 after sprinkler operation for theoccupancy hazard intended to be protected.DECEMBER 16, 2005SUBJECT 1821A4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
12、DISTRIBUTION WITHOUT PERMISSION FROM ULTable 5.1Dry system water delivery time delayOccupancy hazard* Water delivery delay, sResidential 15Light 60* As described in NFPA 13, Standard for the Installation of Sprinkler Systems.6 Impact Resistance Tests for Low Pressure Dry Systems6.1 General6.1.1 Repr
13、esentative pipe and fitting assemblies shall not shatter or fragment when impacted on the pipesidewall when tested as specified in 6.1.2, 6.2 and 6.3.6.1.2 The impact testing shall be conducted at a room temperature of 77F (25C) or less within 5minutes of their removal from the conditioning temperat
14、ure, in accordance with the method described inthe Standard Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittingsby Means of a Tup (Falling Weight), ASTM D2444.6.2 Impact with flat Tup6.2.1 Representative pipe and fitting assemblies for each impact value in the mi
15、nimum and maximumdiameter measuring at least 24 inches (61 cm) in length shall be conditioned for a minimum of 16 hoursat the minimum rated temperature.6.2.2 Immediately following conditioning, each pipe and fitting assembly is to be pressurized to 15 +0/-1psig (103 +0/-7 kPa) with air or nitrogen,
16、placed on a steel V block supporting at least 50% of theexposed pipe length between fittings and subjected to an impact using the Tup specified in 6.2.3.6.2.3 The Tup shall be a 2 pounds-mass (0.9 kg) weight in the form of a 1.25 inch (31.7 mm) diametersteel cylinder with a flat impact face having r
17、ounded edges. The impact value is to be 5 foot-pounds (6.75J) for pipe sizes up to and including 1-1/4 inch (25.4 mm) and 7.5 foot-pounds (10.2 J) for pipe sizes largerthan 1-1/4 inch.DECEMBER 16, 2005 SUBJECT 1821A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITH
18、OUT PERMISSION FROM UL6.3 Impact with conical shaped tup6.3.1 Representative pipe and fitting assemblies for each conditioning temperature both in the minimumand maximum diameter measuring at least 24 inches (61 cm) in length shall be conditioned for a minimumof 16 hours at the minimum rated tempera
19、ture, 32F (0C), and 70F (21C).6.3.2 Additional representative pipe and fitting assemblies measuring at least 18 inches (46 cm) shall besubjected to Ultraviolet Light and Water Exposure as specified in the Standard for Thermoplastic SprinklerPipe and Fittings for Fire Protection Service, UL 1821. Aft
20、er the exposure, the samples shall beconditioned for a minimum of 16 hours at the minimum rated temperature.6.3.3 Immediately following conditioning, each pipe and fitting assembly is to be pressurized to 30 +2/-0psig (206 +14/-0 kPa) with air or nitrogen, placed on a steel V block supporting at lea
21、st 50 percent ofthe exposed pipe length between fittings and subjected to an impact using the Tup specified in 6.3.4.6.3.4 The Tup shall be constructed of steel and have a conical shaped tip and smooth surface. Theimpact value is to be sufficient to perforate the pipe sidewall without excessively de
22、forming the pipe duringimpact. A typical mass and tip construction is shown in Figure 6.1.This is generated text for figtxt.DECEMBER 16, 2005SUBJECT 1821A6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 6.1Typical mass and tip construct
23、ionDECEMBER 16, 2005 SUBJECT 1821A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7 Temperature Cycling Test7.1 Representative pipe and fitting assemblies in the maximum diameter shall not leak when subjected tothe temperature cycles and sha
24、ll comply with the Hydrostatic Pressure Test, Section 23 of UL 1821, afterbeing subjected to temperature cycling from the minimum rated temperature to the maximum ratedtemperature.7.2 The assembly of the pipe and fittings shall be in accordance with the installation and design manual.For flexible pi
25、ping products, samples are to be bent to the minimum bending radius specified in theinstallation and design manual.7.3 The pipe and fitting assemblies are to be pressurized with air or nitrogen to 15 +1/- 0 psig (103 +7/-0kPa) at 70 7F, and subjected to temperature cycles of the minimum rated temper
26、ature to the maximumrated temperature to the minimum rated temperature. Each assembly is to be held at each temperaturespecified for a period of 24 hours. A total of 5 complete cycles are to be completed.7.4 The length of exposed pipe between fittings is to have a minimum length of ten times the dia
27、meter ofthe pipe.Exception: Shorter pipe lengths shall be permitted to be used when testing fitting assemblies.INSTRUCTIONS8 Installation and Design Manual8.1 A copy of the installation and design manual shall be provided for use as a reference in theexamination and testing of pipe and fittings.8.2
28、In addition to the information specified in UL 1821, Section 35, the installation and design manualshall reference the information required for proper installation of low pressure dry system piping and shallinclude at least the following items:a) Maximum rated air pressure not exceeding 15 psig;b) M
29、inimum rated temperature for low pressure dry pipe applications;c) Requirements for either air pressure relief or overpressure alarm if the air pressure exceeds15 psig;d) Specifications for air supply compatibility with the piping material; ande) Requirements for pitching of the pipe to allow for system draining.DECEMBER 16, 2005SUBJECT 1821A8
