From a simplistic standpoint, the best pipe size is obviously the smallest size that will accommodate the application at hand. Dec 03, 2012 regulator sizing regulator capacity calculation determine if pin pout than 1. Maxitrol gas appliances regulators should be installed and operated in. Where gas distribution pressure in excess of 1 2 psig 3. Regulator sizing regulator capacity calculation determine if pin pout than 1. This pressure moves gas along the pipe or tubing to the appliance burner. Pressure regulators are used in elevated pressure system installations over 14 inches water column.
Vents exceeding 40 feet 12 192 mm in developed length shall be increased by one nominal pipe size for the entire developed length of the vent pipe. Regulators installed indoors must be vented outside. Install a bug screen on the vent outlet to prevent insects from nesting in the line. Gas technical guidelines and safety information for property. Gas meter piping supplying gas to a building at a pressure in excess of 1 2 psig 3. It will enable you to determine the pipe size for the length of vent piping you have. Cast iron internal relief valve type used on b35r for 34 vent pipe attachment. The required size of the drain shall be determined in accordance with table 710.
Pipe sizing chart liquid propane lp gas flow is given in thousands of btuhr. Under no circumstances shall the relief vent line be combined with another regulator relief vent line. Code, 2006 international mechanical code and 2006 international fuel. In this model, a red indicator ball stays out after relief valve has functioned. Regulator a device whose function is to control pressure in a gas stream installation pipe the pipe work in a consumers premises between the outlet of the meter and the appliances n. To determine the capacity for gases other than natural gas, multiply the values within the. Model pipe size 243121 and 243122 24381 and 24382 2438hp 11. Pipe sizing tables or sizing equations in accordance with section 402. Piping run from a pressureregulating or pressurelimiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system.
Contact your representative for special construction which may be available for certain corrosive gases. The propane pipe and tube sizing feature allows the. Apr 07, 2015 the 325 series regulator with a vent limiter will reduce the pressure to the rated inlet pressure range of the gas appliance regulator. The maximum flow rate of a service regulator is constrained by the gas. The optimum pipe size optimum pipe size denotes the best pipe size. When using a vent limiting device, the regulator must be mounted in a horizontal upright position. The use of metal pipe, metal tubing, pvc meeting the requirements of ul 651 or flexible pipe meeting the requirements of ul 1660. The regulator vent must be piped to the out doors per nfpa 58. Connectors singlewall pipe stovepipe is not recommended for use in type b venting systems. Gas technical guidelines and safety information for. The gas line size will depend on btu rating of the water heater, the other gas appliances, and where they are installed on each branch from the meter and regulator.
Buried service the model 243 regulator is notrecommended for buried service. Nfpa 96, standard for ventilation control and fire protection of commercial. Vent assembl y basement b2497il vent piping may interfere with the vent ing assembly if the piping obstructs the movement of the vent flapper. The gas vent sizing tables are not applicable to outside exposed chimneys or vents below the roofline per nfpa 54. We hope the following charts will help you in your selection of a properly sized regulator. One cubic foot of lp gas 2516 btu this chart refers to low pressure lp, after regulation, standard nominal pressure at the burner for liquid propane gas is 11 of water column. The 325 must be installed at or near the appliance. Emerson has the following recommendations for the installation of vent piping, based on csa b149 natural gas and propane installation code. Where the installation of a vlp will not provide the required 18 clearance from the lower end of the vlp to final outdoor grade, provisions must be made to elevate the vent outlet terminus. Contains stainless steel spiral vent screen plated steel guide vent down for complete water drain. Too low a container pressure means that not enough gas is able to get to the appliance. If gurgling occurs when gas is turned on to a mercury regulator, or there is a release of gas from the regulator vent, notify washington gas at 7037501400 immediately. Figure 2 table 2is used when sizing a singlewall metal vent connector attached to a type b doublewall gas vent. Requirements for vent limiting device specific gravity maximum allowable flow rate, cubic feet per hour cm3s vent limiter for use only with natural, manufactured, mixed gases, and lp gas air mixtures.
Determining total load is the sum of all propane gas used in an installation and is expressed in btus british thermal units. Vent piping for regulators with internal relief valve models 243122 or 24382 must be large enough to vent all relief. Icc digital codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Vent piping should be as short and direct as possible. This document replaces td1 all products purchased and services performed are. In order to properly size the storage container, regulator, and piping. The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The b42 is a spring loaded selfoperated regulator with internal relief option. Chapter 4 gas piping installations international code. Technical standards and specification manual for gas. Use at least the same diameter pipe as vent treat one pipe elbow as 3 ft of straight pipe while planning the installation increase one pipe size for every 10 ft of piping for regulators with an internal relief valve.
Determining the total load is necessary for sizing the tank or cylinders, regulators and piping for an installation. Vent piping vent piping is necessary for many regulator installations but increases the likelihood of harmonic instability in the field. Run vent pipe from the regulator vent connection to a safe place outside. Based solutions to the worldwide natural gas industry. Using that pipe size, determine equivalent length l d of pipe and. The 325 series regulator with a vent limiter will reduce the pressure to the rated inlet pressure range of the gas appliance regulator. Do not attempt to disassemble or repair the regulator.
Gas regulators natural gas equipment pressure gauges. Vent line manifold size and installation requirements background nfpa 54, national fuel gas code, permits regulator vent lines to be manifolded together in accordance with accepted engineering practices. From a realistic standpoint, optimum pipe size can have many meanings with proper consideration of the application. The regulator body size should never be larger than the pipe size, but it may be smaller provided the required flow can be obtained through the smaller regulator body size. The vent diameter must be equal to or greater than the diameter of the regulator outlet vent. Table 1is used when sizing type b doublewall gas vent connected directly to the appliance. The sizing tables included in a listed piping systems manufacturers installation instructions. Gas piping shall be sized in accordance with one of the following.
Maxitrol line pressure regulators are designed primarily for residential and commercial application in natural gas piping systems. Pipe size of each section of the longest pipe run from the point of deliveryto the most remote. Regulator vents are defined by nfpa 54 as the opening in the atmospheric side of the regulator housing permitting the in and out movement of air to compensate for. Capacity charts for gas pressure regulators the capacity of any regulator is not an absolute value, but will vary with the application depending on the prevailing differential. International fuel gas code page 1 of 1 chapter 4 gas piping installations section 410. The maximum flow rate of a service regulator is constrained by the gas pressure differential across the inlet and outlet port. On indoor installations, the vent should be piped outside the building, see figure 2. No vent line no vent line clean 1 black steel pipe for each elbow greater than 4 elbows, subtract 2. There are 28 inches of water in 1 psi, so it is a fairly small amount of pressure pounds per square inch psi used for measuring gas pressure in the distribution system and other areas where pressure exceeds the traditional 7 wc. There are two methods for determining the required pipe size. Remove the screen from the regulator vent connection and connect vent piping from that connection to the outdoors. In the event of a diaphragm rupture, gas escapement is limited to within the ansi standard requirements.
While used primarily for natural gas services, model 243 regulators perform equally well on lpg vapor, air, dry co 2, nitrogen, and other inert gas applications. Regulator installation and maintenance instructions 243. At higher capacities, it is necessary to increase discharge pipe size. The external vent limiter reduces piping costs and the need for costly vent piping for indoor installations and complies. The straightthruflow rv series, size for size, has the highest pressure drop. Definitions gas main underground pipe network for distributing gas throughout the property development gas service underground pipe for conveying gas to premises from the gas main medium pressure the operating pressure in the gas main and service when it exceeds 75mbar. The 12a09, 12a39, or 12a49 vent limiting devices eliminate the need to run vent piping to an outside area.
By looking at this chart, we find that two of the regulators meet the. Outside temperature greatly affects container pressure. Ainformative sizing and capacities of piping and tubing for natural gas 105 b informative sizing and capacities of piping and tubing for propane 141 c informative vent sizing tables for category i natural gas and propane appliances 168 dinformative customers meter and regulator installations 233. Propane pipe and tube sizing the propane pipe and tube sizing feature allows the recommended tube size based on calculations of type of pipe to be used, flow requirement, length of pipe and desired pressure. Ashrae 152007 indicates how to size the relief vents of pressure regulators for refrigerant piping. The double diaphragm with integral vent limiter provides added security. Vent piping for regulators with an internal relief valve models 243122 or 24382 must be large enough to vent all relief. Too low a container pressure means that not enough gas is. This process fluid temperature accuracy required diaphragm and valve plug to change the size of the flow pipe size required end connection style material requirements control line needed. This process fluid temperature accuracy required diaphragm and valve plug to change the size of the flow pipe size required end connection style. All governor regulators are equipped with balanced valve design for improved high outlet pressure accuracy regardless of inlet pressure variation.
This document replaces td1 all products purchased and services performed are subject to sensus terms. In these circumstances additional safety features apply to the design of the meter installation. Venting provisions for pressure regulators have been clarified to require that the regulator be. Solving instability issues in commercial and industrial.
For more information, visit maxitrol appliance pressure regulator and vent limiter. Regulator vents must open downward and be screened to. The n5 vent allows for indoor use without the need to pipe external vent lines. Run vent pipe from regulator vent connection to safe place outside.
Gas service line trench features are also described. Typical natural gas supply regulator and piping configuration. Pressure regulators that require a vent shall be vented directly to the outdoors. Always turn outlet of the vent line downward so as to limit the effects of outdoor weather and debris. As optional accessories, the regulators and opds offer a vent limiting device. Servicemans manual, the industrys original and most used lpgas servicemans manual. Servicemans manual the propane industrys original and most used lp gas manual now available on your mobile phone or tablet. Gas regulator and gas regulator vent outlets upcodes. Vent pipes shall not be less than 1 1 4 inches 32 mm in diameter. Gas pressure regulator venting hvacr engineering engtips.
The appliance type may be either category i draft hoodequipped or fanassisted. Capacity charts for gas pressure regulators the capacity of any regulator is not an absolute value, but will vary with the applica. The size and depth of installation clearance holes or notches for routing the tubing through. This is done by adding the btu input of all appliances being used. Atype b vent lining an exposed masonry chimney is considered to be an enclosed vent system, and these tables may be used. Ainformative sizing and capacities of piping and tubing for natural gas 105 b informative sizing and capacities of piping and tubing for propane 141 c informative vent sizing tables for category i natural gas and propane appliances 168 dinformative customers meter and regulator.
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