uniform mechanical code- 2009 chapter 14

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1401.0 General.

The regulations of this chapter shall govern theinstallation of process piping in or in conjunctionwith a building or structure or located upon thepremises.

1402.0 Definitions.

For the purposes of this chapter, certain terms,phrases, words, and their derivatives shall be inter-preted as set forth in this section.

APPROVED. See Section 203.0.

E M E RG E N CY A LA RM S Y S TE M A sys te mintended to provide the indication and warning of

abnormal conditions and summon appropriate aid.EMERGENCY CONTROL STATION An approvedlocation on the premises where signals from emer-gency equipment are received.

FABRICATION AREA (FAB AREA) An areawithin a Group H Occupancy semiconductor fabrica-tion facility and related research and developmentareas in that there are processes involving hazardousproduction materials. Such areas are allowed toinclude ancillary rooms or areas such as dressingrooms and offices that are directly related to the fabarea processes.

HAZARDOUS PROCESS PIPING (HPP) A process

material piping or tubing conveying a liquid or gasthat has a degree-of-hazard rating in health, flamma-

bility, or reactivity of Class 3 or 4, as ranked by theFire Code.

HIGH PURITY PIPING A form of process pipingbut is usually specified for critical clean applicationsin the semiconductor, pharmaceutical, biotech-nology, chemical, fiber optics, food, and dairy indus-tries.

HPM STORAGE ROOM A room used for thestorage or dispensing of hazardous production mate-rial (HPM) and that is classified as a Group H, Divi-

sion 1 or Division 2 Occupancy.NONHAZARDOUS PROCESS PIPING (NPP) Production material piping or tubing conveying aliquid or gas that is not classified as hazardousproduction material piping.

PROCESS PIPING Piping or tubing that conveysliquid or gas, which is used directly in research, labo-ratory or production processes, and that is not regu-lated under the mechanical or plumbing code.

SERVICE CORRIDOR A fully enclosed passageused for transporting hazardous production mate-

rials and purposes other than required exiting.USE (MATERIAL) The placing in action or makingavailable for service by opening or connecting anycontainer utilized for confinement of material,whether a solid, liquid, or gas.

1403.0 Permit.

It shall be unlawful to install, alter, or repair or causeto be installed, altered, or repaired any process mate-rial piping without first obtaining a permit.

Permits for process piping shall show the totalnumber of outlets to be provided for on each system

and such other information as may be required bythe Authority Having Jurisdiction.

Fees for process piping permits are included inTable 1-1.

1404.0 Plans Required.

Plans, engineering calculations, diagrams, and otherdata shall be submitted in one or more sets with eachapplication for a permit. The Authority Having Juris-diction may require plans, computations, and speci-fications to be prepared and designed by an engineerlicensed by the state to practice as such.

When plans or other data are submitted forreview, a plan review fee shall be paid, as providedin Section 115.3.

1405.0 Workmanship.

Process piping shall not be strained or bent, nor shalltanks, vessels, vats, appliances, or cabinets besupported by or develop strain or stress on thepiping.

1406.0 Inspections.

1406.1 General. Upon completion of the installation,alteration, or repair of process piping, and prior to theuse thereof, the Authority Having Jurisdiction shall benotified that such piping is ready for inspection.

Excavations required for the installation ofunderground piping shall be kept open until suchtime as the piping has been inspected and approved.If any such piping is covered or concealed beforesuch approval, it shall be exposed upon the directionof the Authority Having Jurisdiction.

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1406.2 Required Inspections. The AuthorityHaving Jurisdiction shall make the following inspec-tions and shall either approve that portion of thework as completed or shall notify the permit holderwherein the same fails to comply with this code.

1406.2.1 Rough Piping Inspection. This

inspection shall be made after all process pipingauthorized by the permit has been installed andbefore any such piping has been covered orconcealed. This inspection shall include a deter-mination that the piping size, material, andinstallation meet the requirements of this code.

1406.2.2 Final Piping Inspection. This inspec-tion shall be made after all piping authorized bythe permit has been installed and after allportions thereof that are to be covered orconcealed are so concealed. This inspection shallinclude a pressure test, at which time the pipingshall stand a pressure of not less than 1.5 times

the maximum designed operating pressurewhen hydraulic testing is conducted or 110percent when testing is conducted pneumati-cally. Test pressures shall be held for a length oftime satisfactory to the Authority Having Juris-diction, but in no case for less than thirty (30)minutes with no perceptible drop in pressure.HPM drain, waste, and vent piping shall betested in accordance with the Plumbing Code.Tests shall be made in the presence of theAuthority Having Jurisdiction. Necessary appa-ratus for conducting tests shall be furnished bythe permit holder.

1406.3 Other Inspections. In addition to the inspec-tions required by this section, the Authority HavingJurisdiction may require a special inspector, as speci-fied in the Building Code, during installation ofpiping systems. In cases where the work authorizedwas installed in accordance with plans and specifica-tions prepared by an engineer, the Authority Having

Jurisdiction may require a final signed report statingthat the work was installed in accordance with theapproved plans and specifications and the applicableprovisions of this chapter.

1407.0 Piping and Tubing.

1407.1 General. Process piping and tubing shallcomply with this subsection and shall be installed inaccordance with nationally recognized standards.Piping and tubing systems shall be metallic unlessthe material being transported is incompatible withsuch system.

1407.2 Hazardous Process Piping (HPP).

1407.2.1 General. HPP supply piping or tubingin service corridors shall be exposed to view.

HPP piping shall be identified in accordancewith nationally recognized standards to indicatethe material being transported. All liquid HPPpiping shall have an approved means fordirecting any spilled materials to an approvedcontainment or drainage system.

All liquid HPP waste or drainage systemsshall be installed in accordance with thePlumbing Code.

1407.2.2 Installation in Exit Corridors and

Above Other Occupancies. Hazardous processsupply pipe shall not be located within exitcorridors, within any portion of a means ofegress required to be enclosed in fire-resistiveconstruction, or in concealed spaces in or aboveareas not classified as Group H Occupancies,except as permitted by this subsection.

Hazardous production material piping andtubing may be installed within the space defined

by the walls of exit corridors and the floor orroof above, or in concealed spaces above otheroccupancies under the following conditions:

1407.2.2.1 Automatic sprinklers shall beinstalled within the space, unless the spaceis less than six (6) inches (152 mm) in leastdimension.

1407.2.2.2 Ventilation at not less than six (6)air changes per hour shall be provided. Thespace shall not be used to convey air fromany other area.

1407.2.2.3 When the piping or tubing isused to transport HPP liquids, a receptorshall be installed below such piping ortubing. The receptor shall be designed tocollect any discharge or leakage and drain itto an approved location. The one (1) hourenclosure shall not be used as part of thereceptor.

1407.2.2.4 All HPP supply piping andtubing and HPP nonmetallic waste linesshall be separated from the exit corridor andfrom any occupancy other than a semi-conductor fabrication facility classified as aGroup H Occupancy by construction, asrequired for walls or partitions that have afire-protection rating of not less than one (1)hour. When gypsum wallboard is used,

joints on the piping side of the enclosureneed not be taped, provided the joints occurover framing members. Access openingsinto the enclosure shall be protected byapproved fire assemblies.

1407.2.2.5 Readily accessible manual orautomatic remotely activated fail-safe emer-

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gency shutoff valves shall be installed onpiping and tubing other than waste lines atthe following locations:

1407.2.2.5.1 At branch connections intothe fabrication area.

1407.2.2.5.2 At entries into exit corri-

dors . Exce ss f low v alv e s shall beinstalled as required by the Fire Code.

1407.2.2.6 Electrical wiring and equipmentl o ca te d i n t he p i pi n g s pa c e s h a ll b eapproved for Class I, Division 2, HazardousLocations.

Exception: Occasional transversecrossing of the corridors by supplypiping that is enclosed within a ferrouspipe or tube for the width of thecorridor need not comply with Sections1407.2.2.1 through 1407.2.2.6.

1407.3 Special Requirements for HPP Gases.

1407.3.1 General. In addition to other require-ments of this section, HPP gases shall complywith this subsection and the Fire Code.

1407.3.2 Special Provisions.

1407.3.2.1 Excess Flow Control. WhereHPP supply gas is carried in pressurizedpiping, a fail-safe system shall shut off flowdue to a rupture in the piping. Where thepiping originates from outside the building,the valve shall be located outside the

building as close to the bulk source as prac-tical.

1407.3.2.2 Piping and Tubing Installation.Piping and tubing shall be installed in accor-dance with approved standards. Supplypiping for hazardous production materialshaving a health hazard ranking of 3 or 4shall have welded connections throughout,unless an exhausted enclosure is provided.

Exception: Material that is incompatiblewith ferrous piping may be installed innonmetallic piping with approvedconnections.

1407.3.2.3 Gas-Detection System. When

hazardous production material gas is usedor dispensed and the physiological warningproperties for the gas are at a higher levelthan the accepted permissible exposure limitfor the gas, a continuous gas-monitoringsystem shall be provided to detect the pres-ence of a short-term hazard condition. Whendispensing occurs and flammable gases orvapors may be present in quantities inexcess of 20 percent of the lower explosive

limit, a continuous gas-monitoring systemshall be provided. The monitoring systemshall be connected to the emergency controlstation.

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