EFisher Controls International, Inc. 1996; All Rights Reserved, 9/96 Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc. All other marks are the property of their respective owners. Type 299 Pressure Reducing Regulators Bulletin 71.2:299 D102308X012
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Bulletin 71.2:299
Type 299 Pressure Reducing Regulators
�Fisher Controls International, Inc. 1996; All Rights Reserved, 9/96
Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by FisherControls International, Inc. or Fisher-Rosemount Systems, Inc.All other marks are the property of their respective owners. D
1023
08X
012
Bulletin 71.2:299
D Wide Variety of Applications— Natural gas dis-tribution systems, gas supply to industrial boilers,furnaces, ovens, mixers, plant air service.
D No Atmospheric Bleed— Load-ing pressure bleeds downstreamthrough pilot via bleed restrictionand downstream control line. Nobleed occurs when regulator isshut off.
D Accuracy— Keeps constant inlet pressures to down-stream equipment by accurately controlling distributionsystem pressures at widely varying flow rates and supplypressures for maximum efficiency and best operation, orby eliminating the need for pressure-compensating me-ters by holding a steady pressure to the meter inlet.
Type 299 Pressure Reducing Regulator FeaturesD H ig h -C a p a c ity P re s s u re C o n tro l— Actuator
diaphragm responds quickly to downstreampressure change, causing immediate correc-tion in main valve position. Pilot respondssimultaneously and controls final positioningof main valve. This action permits full mainvalve travel, resulting in higher capacity thancould be obtained without a pilot.
D Economical, Labor-Saving Installation— Supplypressure to pilot is factory-piped directly from inletside of main regulator body, thus requiring noupstream pilot supply line on standard installations.
D Easy to Maintain— Main valve disk and orifice canbe inspected without removing body from pipeline.Easy access two bolt flange permits quick removalof actuator and pilot from body.
D Not an adaptation of existing regulators—New design of intergrated cases and internalregistration ports.
D Rugged Construction—Cast aluminum casings,steel bodies. Two bolt con-nection of the regulator tothe body, no union ring.
D Reusable O-rings At All ServicableJoints— No gaskets.
D Easy RegistrationConversion— Two screwsand O-rings to change inter-nal registration to externalor dual registration.
D Easy Startup—No specialprocedurerequired.
D Fewer Parts— Reduces parts inventory(recommended parts) only one closing spring.
D Highest Quality— Designed andmanufactured to ISO 9001 standards
D Compact in Size— Small envelope because of thebuilt in pilot and internal registration.
INLET
OUTLET
DOWNSTREAMCONTROL LINE
PILOT
2
Bulletin 71.2:299
SpecificationsBody Size And End Connection Styles� 1-1/2-inch, 2-inch NPT screwed or,� 2-inch ANSI Class 125 and 250 flanged
Orifice Sizes and Maximum Allowable Inlet Pres-sure (1)
Pressure Control Accuracy+/– 1% of absolute control pressure
Minimum Differential Pressure For Full Stroke
r c sud w
1.5 psi (0.10 bar)
Maximum Emergency Outlet Pressure (1)
45 psig (3.1 bar)
Flow CoefficientsSee Table 2
Typical Regulating CapacitiesSee Tables 3 to 5
Construction MaterialsActuator Upper Casing: Aluminum (A03800)Actuator Lower Casing: Aluminum (A03800)
1. The pressure/temperature limits in this bulletin and any applicable standard o2. For optinum preformance, a pilot supply regulator may be installed in the pilot3. Only one (a pressure loading regulator or a P590 Series filter) may be ordere
Pilot Spring Case: Aluminum (A03800)Actuator Diaphragm: NitrilePilot Diaphragm: NitrilePilot Inlet Screen: 18–8 stainless steelValve Body: � Cast iron, or � steelOrifice and Valve Stem: Aluminum (A92017)Disk Holder: Aluminum (A92017)/nitrileMain Disk Construction: NitrileMetal Trim Parts For Pilot: � Steel, � stainlesssteel, or � aluminum
Pilot Disk Construction: NitrileO-Rings: NitrileFittings And Tubing: � Steel/stainless steel (std),� brass/copper, or � stainless steel
Approximate Weight21 lbs (9.5 kg)
Temperature Capabilities (1)
–20� to 150�F (–29� to 65.5�C)
Control Line And Pilot Connections:See Figure 5
Additional Options:Three fixed restriction sizes to choose from:.044-inch (1.12 mm) red (std. gain).071-inch (1.80 mm) green (low gain).082-inch (2.08 mm) blue (lower gain)
Pressure loading regulator (3): A Type 67AF withan internal 40 microns filterFilter (3): A P590 Series filter installed in the pilotsupply tubing between main body and pilot
ode limitation should not be exceeded.pply tubing between the main valve and pilot.ith the Type 299, but not both.
Table 1. Outlet Pressure Ranges
MAXIMUM RECOMMENDED OUTLET (CONTROL)PILOT CONTROL SPRING
MAXIMUM RECOMMENDEDPILOT SUPPLY PRESSURE
OUTLET (CONTROL)PRESSURE RANGE Part Number Color Code Free Length
Inches (mm)Wire DiameterInches (mm)
40 psi(1)
(2.8 bar)
3.5 to 6 inches w.c. (9 to 15 mbar)6 to 9 inches w.c. (15 to 22 mbar)9 to 20 inches w.c. (22 to 49 mbar)16 to 40 inches w.c. (40 to 99 mbar)
T13707T0012T13589T00121N3112X00121B413727222
BlackYellowSilverPurple
1.86 (47.2)2.05 (52.0)2.18 (55.4)2.12 (53.8)
0.055 (1.4)0.051 (1.3)0.075 (1.9)0.092 (2.3)
150 psi(10.3 bar)
1 to 3.25 psig (0.07 to 0.14 bar)3.25 to 6 psig (0.14 to 0.41 bar)6 to 16 psig (0.41 to 1.10 bar)16 to 35 psig (1.10 to 2.4 bar)
T13593T0012T13671T0012T13600T0012T13771T0012
Lt. BlueOrangeRedZinc
2.12 (53.8)2.40 (61.1)2.10 (53.3)2.15 (54.6)
0.105 (2.7)0.120 (3.0)0.142 (3.6)0.207 (5.3)
1. Use a pilot supply regulator if actual inlet pressure exceeds 40 psi (2.8 bar).
Table 2. Flow Coefficients and Orifice Diameters
ORIFICE DIAMETER FOR RELIEF SIZING REGULATING C1 C1O CINCH (mm)
O S GWIDE OPEN Cg
GU GCg
C∆P < 10 psi ∆P ≥ 10 psi
1/4 x 3/8 (6.4 x 9.5)3/8 (9.5)
1/2 (12.7)3/4 (19.1)1 (25.4)
1-3/16 (30.2)
53117203437725910
50115200430710885
263030323637
262828303435
3
Bulletin 71.2:299
Figure 3. Operational Schematic of Type 299 Regulator (External Registration)
INLET
OUTLET
DOWNSTREAMCONTROLLINE
B
H
C
AFG
D
E
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE
J
PILOTSUPPLYSCREEN
4
Principle of Operation
Letter keys in this section refers to figure 3 unlessotherwise noted. Fast response and accuracy aremade possible by the amplifying effect of the pilot andby the two-path control system. The function of thepilot is to sense change in the controlled pressure andamplify it into a larger change in the loading pressure.Any changes in outlet pressure act quickly on both theactuator diaphragm and the loading pilot, thus provid-ing the precise pressure control that is characteristic ofa two-path system.
A typical pilot has an approximate gain of 50, whichmeans the outlet pressure needs to droop only 1/50 asmuch as a self-operated regulator in order to obtainthe same pressure differences across the main dia-phragm. Advantages of a pilot operated regulator arehigh accuracy and high capacity.
Upstream or inlet pressure is utilized as the operatingmedium, which is reduced through pilot operation toload the main diaphragm chamber. Tubing connectsthe inlet pressure to the pilot. Downstream or outletpressure registers underneath main diaphragm (E)and on top of pilot diaphragm (F). There are threedifferent versions of registration for the Type 299.
a. Internal registration (screws (J) removed)—Outlet pressure is registered through the throat tothe main diaphragm chamber and then through asmall port (G) to the top of the pilot diaphragm.
b. External registration— The throat is blocked byscrews (J) and a downstream control line is con-nected to the pilot diaphragm chamber which isconnected to the lower main diaphragm chamberby a small port (G).
Bulletin 71.2:299
c. Dual registration (screws (J) removed)— The
lower main diaphragm chamber registers outletpressure through the throat and pilot diaphragmchamber registers downstream pressure by use ofa downstream control line. The port (G) betweenthe chambers is blocked by inserting a screw (J).
In operation, assume the outlet pressure is less thanthe setting of pilot control spring (A). The top side ofpilot diaphragm assembly (F) will have a lower pres-sure than the setting of spring (A). Spring (A) forcesthe diaphragm assembly upward, opening the pilotorifice (C). Additional loading pressure is supplied tothe top side of main diaphragm (E).
This creates a higher pressure on the top side of maindiaphragm (E) than on the bottom side, forcing thediaphragm downward. This motion is transmittedthrough a lever, which pulls the valve disk open, allow-ing more gas to flow through the valve.
When the gas demand in the downstream system hasbeen satisfied, the outlet pressure increases. The in-creased pressure is transmitted through the down-stream control line and acts on top of the pilot dia-phragm (F). This pressure exceeds the pilot springsetting and forces the diaphragm down, closing orifice(C). The loading pressure acting on main diaphragm(E) bleeds to the downstream system through a bleedrestriction (H).
With a decrease in loading pressure on top of maindiaphragm (E), main spring (B) exerts an upward forceon the diaphragm post connected to main diaphragm(E), pulling it upward. This moves the main valve to-ward its seat, decreasing flow to the downstream sys-tem.
Overpressure Protection
Like most regulators, the Type 299 has outlet pressureratings lower than the inlet pressure ratings. Completedownstream overpressure protection is needed if theactual inlet pressure exceeds the outlet pressure rat-ing.
Overpressure protection for internal parts is built intothe main and pilot diaphragms by means of a smallspring on each post. The springs will allow the dia-phragms to move farther on the posts avoiding dam-age to or bending of the valve trim.
Overpressuring any portion of a regulator orassociated equipment may cause leakage, part dam-age, or personal injury due to bursting of pressure-containing parts or explosion of accumulated gas.Regulator operation within ratings does not precludethe possibility of damage from external sources orfrom debris in the pipeline. A regulator should be in-
spected for damage periodically and after any over-pressure condition.
The pilot is provided with a 1/4-inch NPT tappedconnection in the spring case.
Monitoring Systems for Safety
Monitoring regulators serve as overpressure protectiondevices to limit system pressure in the event of openfailure of a working regulator feeding the system. Amethod of using Type 299 regulators in monitoringsystems are as follows:
� Wide Open Monitor— The control line of the up-stream regulator is connected downstream of thesecond regulator (figure 4), so that during normaloperation the monitoring regulator is standing wideopen with the reduction to distribution pressure be-ing taken across the working regulator. Only in caseof open failure of the working regulator does thewide-open monitoring regulator take control at itsslightly higher setting.
The upstream regulator can easily be field convertedor ordered with screws and O-rings in the throat (fig-ure 3). This seals off the path that otherwise would letline pressure ahead of the working regulator inlet try toclose the wide-open monitoring regulator.
Figure 4. Typical Wide-Open Monitor Installations
OPTIONAL PILOTSUPPLY REGULATOR
OPTIONAL PILOTSUPPLY REGULATOR
MINIMUM PIPING ARRANGEMENT THAT REQUIRESWIDE-OPEN MONITOR ALWAYS TO BE UPSTEAM
FLEXIBLE ARRANGEMENT THAT PERMITS WIDE-OPENMONITOR TO BE EITHER UPSTREAM OR DOWNSTREAM
WORKINGREGULATOR
OPTIONAL PILOTSUPPLY REGULATOR
WIDE-OPEN MONITOR
5
Bulletin 71.2:299
Capacity InformationTables 3 to 5 gives Type 299 natural gas regulatingcapacities at selected inlet pressures and outlet pres-sure settings. Flows are in scfh (60�F and 14.7 psia)of 0.6 specific gravity gas at 60�F. To determineequivalent capacities for air, propane, butane, or nitro-gen, multiply the table 6 capacity by the following ap-propriate conversion factor: 0.775 for air, 0.628 forpropane, 0.548 for butane, or 0.789 for nitrogen. Forgases of other specific gravities, multiply the givencapacity by 0.775 and divide by the square root of theappropriate specific gravity. Then, if capacity is de-sired in normal cubic meters per hour (m3/hr) at 0�Cand 1.01325 bar, multiply scfh by 0.0268.
To determine regulating capacities for pressures orconstructions not given in tables 3 to 5, or to deter-mine wide-open capacities for relief sizing at any inletpressure, use the following formula and convert ac-cording to the factors in the preceding paragraph if
necessary:
where: C1 = Cg/Cv (See table 2) Cg = Gas sizing coefficient (see table 2) G = Gas specific gravity (air =1.0) P1 = Regulator inlet pressure, psia ∆P = Pressure drop across regulator, psi Q = Gas flow rate, scfh T = Absolute temperature of gas at inlet, degree
Rankine
Note
Due to boost, the above formula can notbe used to obtain correct regulating ca-pacities for regulators with internal reg-istration.
The published capacities were obtained using inlet andoutlet piping the same size as the regulator body size.
6
Pressure Registration MethodsInternal — use for easiest installation. Capacity issomewhat limited because of droop and /or boost as-sociated with sensing pressure within the body.
External — use for higher capacity and /or upstreamregulator in a monitor set. Capacity is increased be-cause of better registration of pipeline pressure whena control line is used. The alternate 1/2-inch NPT con-
trol line connection can be used for piping conve-nience.
Dual (internal plus external) — use to improve perfor-mance over internal pressure registration when thereis a low flow rate and high pressure drop and a largeorifice (control line must be piped to the primary1/4-inch NPT connection on the the pilot).
InstallationAlthough the actuator and pilot can be mounted in 90�increments relative to the body, the normal installationis with the body in a horizontal run of pipe and the pilothanging vertically from the bottom of the actuator.
Control and vent lines necessary for installation arenot supplied with a Type 299 regulator. Control andvent connection locations are shown in figure 5. Inmany instances good piping practice will require thatoutlet piping be swaged up above the body size to pre-vent excessive pressure drop along the outlet line. Thepiping should be expanded as close to the regulatoroutlet as possible.
Dimensional information also is given in figure 5.
Ordering InformationTo order a particular construction specify the itemslisted below. In addition, any optional constructionsmust be specified.
Application
1. Composition and specific gravity of gas (includingchemical analysis if possible).2. Range of temperatures, flowing inlet pressures(maximum, minimum, nominal), and pressure drops.3. Desired outlet pressure setting.4. Range of flow rates (minimum controlled, maximum,normal).5. Piping size(s).6. Tubing fitting material.
7. Pilot supply regulator or a P590 series filter option.8. Internal or External registration.9. Body material.10. Body end connection.
Construction
Refer to the Specifications on page 3. Carefully re-view each specification and/or referenced tables,specify the desired selection whenever there is achoice to be made.
Bulletin 71.2:299
Table 3. Regulating Capacities For 1-1/2-inch and 2-inch External/Dual Registration in SCFH (60�F and 14.7 psia) of 0.6 SpecificGravity Natural Gas.
OUTLET PRESSURERANGE AND SETTING,
INLET PRESSURE ORIFICE SIZE, Inches (mm)RANGE AND SETTING,
CONTROL SPRINGNUMBER, & COLOR
psig bar 1/4 X 3/8(6.4 X 9.5)
3/8(9.5)
1/2(12.7)
3/4(19.1)
1(25.4)
1-3/16(30.2)
3 5 t 6 i h
2 0.14 760 1560 2700 5490 8170 9940
3 5 t 6 i h
5 0.34 1160 2460 4270 8790 13310 16250
3 5 t 6 i h
10 0.69 1590 3580 6230 13060 20300 24900
3 5 to 6 inches w c15 1.0 1920 4410 7670 16480 27210 33910
Table 3. Regulating Capacities For 1-1/2-inch and 2-inch External/Dual Registration in SCFH (60�F and 14.7 psia) of 0.6 SpecificGravity Natural Gas. (continued)
OUTLET PRESSURERANGE AND SETTING ,
INLET PRESSURE ORIFICE SIZE, Inches (mm)RANGE AND SETTING ,
CONTROL SPRINGNUMBER, & COLOR
psig bar 1/4 X 3/8(6.4 X 9.5)
3/8(9.5)
1/2(12.7)
3/4(19.1)
1(25.4)
1-3/16(30.2)
1 0 3 2 i
5 0.34 1020 2100 3640 7440 11140 13560
1 0 3 2 i
10 0.69 1550 3340 5810 12040 18460 22570
1 0 3 2 i
15 1.0 1920 4360 7580 15990 25050 30760
1.0 to 3.25 psig 20 1.4 2240 5150 8960 19250 31790 396201.0 to 3.25 psig(0.07 to 0.14 bar) 25 1.7 2670 5890 10250 22030 36370 45330( )
Table 3. Regulating Capacities For 1-1/2-inch and 2-inch External/Dual Registration in SCFH (60�F and 14.7 psia) of 0.6 SpecificGravity Natural Gas. (continued)
OUTLET PRESSURERANGE AND SETTING,
INLET PRESSURE ORIFICE SIZE, Inches (mm)RANGE AND SETTING,
TYPE 2992 X 2�INCH NPT BODY5 PSIG OUTLET PRESSURE SETTING1�INCH ORFICET13671T0012 CONTROL SPRING
OU
TLE
TP
RE
SS
UR
E,
PS
IG
OU
TLE
TP
RE
SS
UR
E,
BA
R
10 PSIGINLET
30 PSIGINLET
50 PSIGINLET
FLOW RATE, SCFH OF 0.6 SPECIFIC GRAVITY NATURAL GAS
20 PSIGINLET
60 PSIGINLET
0.48
0.41
0.28
0.21
A6899 / IL
15
Bulletin 71.2:299
Figure 7. Type 299 Dimensions
1/4–18 NPTCONTROL LINECONNECTION
4.9(124)
1/2–14 NPTALTERNATIVECONTROL LINECONNECTION
1/4–18 NPT VENT
5.8(147)
13.7(348)
12.1(307)
8.6(218)
3.1(79)
FILTEROPTION
PILOT SUPPLYFILTER REGULATOROPTION
7.6(193)
7.9(201)
A
4.3(109)
INCH(mm)
BODY A
1–1/2 NPT X 1–1/2 NPT2 NPT X 2 NPT2 IN CLASS 125 FF FLG2 IN CLASS 250 RF FLG
6.12 (155)6.12 (155)10.00 (254)10.50 (267)
T13821–C / IL
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For information, contact Fisher Controls:Marshalltown, Iowa 50158 USACernay 68700 France Sao Paulo 05424 BrazilSingapore 0512
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied,regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.