PRESSURE REGULATORS Types EZH and EZHSO

Transcription

1 PU GUTO Types Z and ZO urope, iddle ast and frica Only

2 Types Z and ZO egulators Pressure egulators Types Z and ZO (pring-to-open) regulators are accurate pilot-operated, pressure-balanced, soft-seated regulators. They are designed for use in high pressure natural gas transmission / city gate stations, large capacity distribution systems and power plant feeds. They provide smooth, reliable operation, tight shutoff and long life. The main benefits are as follows: ong life in severe service applications: The Types Z and ZO utilize a metal plug design to deflect particles and debris away from the soft-seat, which gives enhanced resistance to particle erosion to provide a longer service life. n addition, the Types Z and ZO can be constructed with fluoroelastomer soft parts to extend service life in applications where liquid aromatics are entrained in the gas. igh turn down capability: The oversized diaphragm and unique piloting system of the Types Z and ZO allow for a 100:1 turn down ratio, which will provide superior pressure control in systems with large variations in downstream flow demand. Noise attenuation module: The Types Z and ZO offer an optional Whisper Trim age which is integral to the regulator therefore maintaining the advantages of its compact design. The Whisper Trim age is available on DN 50, 80, 100, 150 and 200. t allows for a noise attenuation up to 8 d. bsolutely no bleed to atmosphere: The Types Z and ZO eliminate nuisance and wasteful bleed gas to atmosphere by utilizing a pilot-operated control system, which bleeds 100% of the gas to the downstream system while the regulator is operating. Wide range of flows coefficients for each body size: The Types Z and ZO offer the possibility of flow reduction ranges according to each body size. This is achieved by simply replacing the standard seat by a reduction seat. ubble tight shutoff: The Types Z and ZO have a knife-edged, metal plug and a soft seat which provides bubble tight shutoff for use in applications where positive shutoff is required. For example: dead-end systems. ccurate pressure control: The Types Z and ZO use the Types PX and /2 pilot system to provide stable and accurate downstream pressure control regardless of load changes or inlet pressure variations. asy maintenance system: top entry design reduces maintenance time. Trim parts can be inspected, cleaned and replaced without removing the body from the pipeline. n innovative system has been designed for the Types Z DN 100, 150 and 200 which allows maintenance to be carried out by a single operator for DN 100 and by two operators for DN 150 and 200. aintenance is carried out by simply removing the top plug, extracting the trim assembly, removing the pad holder and then changing the pad. asy and fast maintenance, no special tools requirement, makes the Type Z ownership low in cost. pring-to-close and spring-to-open versions: Optional positions to choose from in case of main valve diaphragm failure or lack of supply pressure to the pilot. ee table on page 6 for "Failure ode nalysis". urope, iddle ast and frica Only NO (d) Z ND ZO WT TNDD G Z ND ZO WT WP T G FOW T (Nm 3 /h) Noise omparison Diagram Whisper Trim age 2

3 Types Z and ZO egulators Plug Trim assembly Pad holder onfigurations Type Z: Type Z-O2: Type ZO: Type Z DN 100 asy aintenance ystem Pilot-operated pressure reducing regulator for low to high outlet pressure. Type Z pressure reducing regulator with a Type O2 slam-shut device for overpressure or overpressure and underpressure protection. pring-to-open pilot-operated pressure reducing regulator for low to high outlet pressure. Type ZO-O2: Type ZO pressure reducing regulator with a Type O2 slam-shut device for overpressure or overpressure and underpressure protection. urope, iddle ast and frica Only Type Z Type Z-O2 3

4 Types Z and ZO egulators Operation TYP /2 TYP PX/120 TYP PX/120-P TYP PX/120 TYP PX/120-P TYP /2 The pilot-operated Type Z uses inlet pressure as the operating medium, which is reduced through pilot operation to load the actuator diaphragm. Outlet pressure (Pd) opposes the motorization pressure (Pm) in the actuator and also opposes the pilot control spring. Type ZO pring-to-open version uses inlet pressure as the operating medium, which is reduced through pilot operation to load the actuator diaphragm (lower chamber). The upper case of Type ZO actuator is filled with pressure coming from stabilizer filter Type /2. This pressure on the upper chamber of the regulator actuator diaphragm opposes the main spring force that tends to open the regulator. The outlet pressure opposes the pilot control spring. Opening TYP Z GUTO nlet pressure egulator motorization pressure Outlet pressure TYP ZO GUTO tabilized pressure When the outlet pressure (Pd) drops below the setting of the pilot control spring, pilot control spring force on the pilot diaphragm thus opens the pilot valve plug, providing additional motorization pressure (Pm) to the actuator diaphragm. This diaphragm motorization pressure opens the main valve plug, supplying the required flow to the downstream system. ny excess motorization pressure on the actuator diaphragm escapes downstream through the bleed restriction in the pilot. urope, iddle ast and frica Only losing TYP Z - When the gas demand in the downstream system has been satisfied, the outlet pressure (Pd) increases. The increased pressure is transmitted through the downstream control line and acts on the pilot diaphragm. This pressure exceeds the pilot spring setting and moves the diaphragm, closing the orifice. The motorization pressure (Pm) acting on the main diaphragm bleeds to the downstream system through a bleed restriction in the pilot. TYP ZO - When the outlet pressure (Pd) increase over the setting of the pilot spring, the pilot valve disk will be closed, reducing motorization pressure (Pm) to the lower chamber of the regulator actuator diaphragm; the pressure in the upper chamber will force the regulator to close. djustment The adjustment of the regulator is performed by means of the pilot adjusting screw, which causes variation of the compression of the control spring. djustment is performed while the regulator is in operation with the aid of a pressure gauge to monitor downstream pressure. The shut-off valve downstream of the regulator must not be completely closed, it is necessary that a small quantity of gas flows downstream to allow the outlet side to vent when it is necessary to lower the pressure. 4

5 Types Z and ZO egulators Operation onitoring ystem onitoring regulation is overpressure protection by containment, therefore, there is no relief valve to vent to the atmosphere. When the working regulator fails to control the pressure, a monitor regulator installed in series, which has been sensing the downstream and control pressure, goes into operation to maintain the downstream pressure at a slightly higher level than normal pressure. During an overpressure situation, the monitoring system keeps the customer on line. Wide-Open onitoring ystems TYP /2 /2 TYP PX/120 TYP PX/120-P TYP PX/120 TYP PX/120-P urope, iddle ast and frica Only TYP Z ONTO TYP ZO GUTO nlet pressure onitor motorization pressure egulator motorization pressure Outlet pressure tabilized pressure This figure shows an upstream wide open monitor Type Z and a downstream active regulator Type ZO (pring-to-open). n this installation, if the Type ZO no longer controls the outlet pressure, it will remain open, letting the Type Z regulator to reach the required outlet pressure. n case of failure of the Type Z, it will close and protect the downstream system from overpressure condition. 5

6 Types Z and ZO egulators Operation Working onitoring ystem TYP /2 /2 TYP PX/125 TYP PX/125-P TYP PX/120 TYP PX/120-P TYP PX/120 TYP PX/120-P TYP Z ONTO nlet pressure ntermediate pressure TYP ZO GUTO egulator motorization pressure onitor motorization pressure tabilized pressure Outlet pressure n a working monitoring system, the upstream regulator requires two pilots and it is always the monitoring regulator. n this way, both units are always operating and can be easily checked for proper operation. n normal operation, the working regulator controls the outlet pressure of the system. The monitoring regulator s working pilot Type PX/120 or PX/120-P controls the intermediate pressure and the monitor pilot Type PX/125 or PX/125-P senses the system s outlet pressure. f the working regulator fails, the monitoring pilot Type PX/125 or PX/125-P will sense the increase in outlet pressure and take control. The working regulator must be rated for the maximum allowable operating pressure of the system because this will be its inlet pressure if the monitoring regulator fails. lso, the outlet pressure rating of the monitoring pilot Type PX/125 or PX/125-P and any other components that are exposed to the intermediate pressure must be rated for full inlet pressure. Working monitor installations require a Type Z or ZO main valve with a Type PX/120 or PX/120-P working pilot and a Type PX/125 or PX/125-P monitoring pilot for the upstream regulator, and a Type Z or ZO with the appropriate Type PX/120 or PX/120-P pilot for the downstream regulator. urope, iddle ast and frica Only Failure ode nalysis Part Name Failure (Worst ase) ause of Failure ffect Type egulator eaction ode Filter Filter blocked / clogged Dirty gas Decrease of feeding pressure gives decrease of motorization pressure ZO Z Open lose Pilot Disk Pilot cannot be closed Dirty gas (microparticles), sour gas ncrease motorization pressure ZO Z Open Open Pilot ower Diaphragm Pilot cannot control Fabric quality, sour gas Decrease motorization pressure ZO Z Open lose Pilot Upper Diaphragm Pilot cannot feed the regulator Fabric quality, sour gas Decrease motorization pressure ZO Z Open lose egulator Diaphragm Not proper performance of the motorization pressure chamber Fabric quality, sour gas alancing of pressures and charge or discharge of the motorization pressure chamber ZO Z Open lose 6

7 Types Z and ZO egulators Features pplications Technical Features Z and ZO eries regulators are used in reduction, distribution and conveying stations of suitably filtered natural gas. They can also be used for air, propane, butane, PG, city gas, nitrogen, carbon dioxide and hydrogen. llowable pressure P : up to 100 bar nlet pressure P u : 1 to 100 bar et range P d : 1 to 80 bar inimum operating differential pressure Type Z p min : 1 bar Type ZO p min : 3.8 bar (DN 25, 50 and 80) 1.8 bar (DN 100) 1 bar (DN 150 and 200) aximum operating differential pressure Type Z p min : 99 bar Type ZO p min : 96.2 bar Functional Features ccuracy class Type Z : up to ± 1% Type ZO : up to ± 2.5% ock-up pressure class G : up to + 5% lass of lock-up pressure zone Z : up to 5% Operating temperature T : -20 / / 71 (optional) hut-off device aximum operating differential pressure p max : 99 bar esponse time ta : < 1 s urope, iddle ast and frica Only ccuracy class Diaphragm and bellows version G : up to ± 2.5% Piston version G : up to ± 5% et pressure range W du - W do : / 100 bar Flanged connections ame nlet and outlet: DN Flange rating: PN 16 - PN 25 - PN 40 N 150 F - N 300 F - N 600 F aterials ody teel egulator valve plug tainless steel onnecting parts and bottom teel lam-shut valve plug tainless steel ctuator teel egulator plug disc Nitrile or fluorocarbon (FK) egulator / lam-shut orifice tainless steel lam-shut O-rings Nitrile or fluorocarbon (FK) 7

8 Types Z and ZO egulators alculation Procedures ymbols Q = Natural gas flow rate in tm 3 /h P1 = bsolute inlet pressure in bar P2 = bsolute outlet pressure in bar g = Flow rate coefficient 1 = ody shape factor d = elative density of the gas Flow oefficients types ezh nd ezhso Q f g 1 eduction lam-hut (X ody) Without lam-hut ( ody) DN 25 DN 50 DN 80 DN 100 DN 150 DN 25 DN 50 DN 80 DN 100 DN 150 DN , , ,600 25, , , , Types Z and ZO with Whisper urope, iddle ast and frica Only eduction lam-hut ntegrated (X ody) Without lam-hut ( ody) DN 25 DN 50 DN 80 DN 100 DN 150 DN 25 DN 50 DN 80 DN 100 DN 150 DN ,088 Q f g , ,410 19, , ,

9 Types Z and ZO egulators Flow ate Q ub-critical state with: P2 > P1 2 Q = g P1 sine P1-P2 P1 N.. the sine argument is expressed in sexagesimal degree. DN izes ritical state with: P2 Q = g P1 P1 2 For other gases with different densities, the flow rate calculated with the above formulas must be multiplied by the correction factor: F= 0.6 d alculate the required g with the following formula: P1 ub-critical with: P2 > 2 g = P1 sine Q P1 - P2 P1 N.. The sine argument is expressed in sexagesimal degree. ritical state with: P2 P1 2 Q g = P1 Gas elative Density d Factor F ir ity gas utane Propane Nitrogen arbon dioxide ydrogen urope, iddle ast and frica Only N.. The above formulas apply to natural gas flow rate only. f the flow rate value (Q) refers to other gasses, divide it by the correction factor F. von ises (N/mm 2 (Pa)) 5.746e e e e e+002 elect the diameter of the regulator with g higher than calculated value. fter finding the DN of the regulator, check that gas speed on the seat does not exceed 120 m/sec, using the following formula: 3.353e e e e e e e e+001 = Q DN P u 1 + P u = elocity (m/s) = Numerical constant Q = Flow rate under standard conditions (tm 3 /h) DN = egulator nominal diameter (mm) = nlet pressure in relative value (bar) P u dvanced Design Tools 9

10 Types Z and ZO egulators lam-hut Device The optional slam-shut device can provide either overpressure or overpressure and underpressure protection by completely shutting off the flow of gas to the downstream system. The slam-shut has a mechanism box and a manometric device. The manometric device is a spring and diaphragm actuator. ts movement activates the detection stage of the mechanism box. The shutoff is a two-stage process, the detection stage and the power stage. This separation between detection stage and power stage provides maximum precision, alleviating many false trips caused by environmental vibrations. The slam-shut device includes a bypass valve that will allow pressure to be equalized when resetting the device. Once the slam-shut device has been tripped, it must be manually reset. For more information about the Types Z and ZO with a slam-shut device, contact the local ales epresentative or ales Office. pring djustment anges () Type ellows Piston Diaphragm ax. Only in. Only ax. and in. W dso etting (bar) W dsu etting (bar) W dsu etting (bar) P ize box ecommended ange ecommended ange (bar) ax. low pt. possible ax. low pt. ax. high pt. in. low pt. possible in. low pt. in. high pt. in. low pt. possible ax. high pt. 1 (bar) ntervals 1 and Not possible with only (bar) urope, iddle ast and frica Only N OX OTON FO WT P DNG T PN WT WT DOT TPPNG PT NOT NNG D (1) NOT D TDD T OND TG NG FT T TOP T W ND FT W TTNG TOO P W ONNT echanism ox (1) with One anometric ensing Device (1) echanism ox (2) with Two anometric ensing Devices (1 and 2) Type O2 nternal Parts 10

11 Types Z and ZO egulators pplications and onstruction Guide pplication echanism ox anometric ensing Device Overpressure hut-off (OPO) Yes No Yes No Underpressure hut-off (UPO) Yes No Yes No Overpressure hut-off (OPO) and Underpressure hut-off (UPO) Yes No Yes (1) No Overpressure hut-off (OPO) and Underpressure hut-off (UPO) No Yes Yes (2) Yes Overpressure hut-off (OPO), Overpressure hut-off (OPO) and Underpressure hut-off (UPO) No Yes Yes Yes 1. When using one manometric sensing device (1) for both overpressure and underpressure shutoff, make sure that the difference between set pressures falls within the maximum range shown in above table "pring djustment anges". 2. When using two manometric sensing devices (1 and a 2), the 1 can only be used for high trip. ersions of xplosion Proof imit witches lectrical connections ersions nstallment Tightness onnection echanical connections ommon NF NO onnection 0 P 68 Without ap 1/2 NPT 1 xplosion proof P 68 xplosion proof 3 m wire lack lue rown Wires 2 xplosion proof P 65 xplosion proof onnector box explosion proof P explosion proof crewed wiring 3 ntrinsically safe P 68 xplosion proof ntrinsically safe tight-shut connector Welded wiring 3 m NF : Normally losed NO : Normally Open 1 ontact ersion xplosion proof connection with cable and tight-shut packing gland WNG K U N NF --> K/U NO --> K/N TYP /2 TYP PX/120 TYP PX/120-P urope, iddle ast and frica Only WNG WNG TYP Z - O2 K U N K U N NF --> K(3)/U(4) NO --> K(3)/N(5) NF --> K()/U() NO --> K()/N() 2 ontact ersion xplosion proof connection with explosion proof connector box 3 ontact ersion xplosion proof connection with tight-shut connector for intrinsically safe nlet pressure egulator motorization pressure Outlet pressure tabilized pressure 11

12 Types Z and ZO egulators Pilots The Types Z and ZO pressure reducing regulator includes a PX eries pilot mounted on the Types Z and ZO main valve for pressure reducing or wide-open monitoring applications. PX eries pressure reducing pilots have the ability to handle a wide range of set points from 1 to 80 bar: Type PX/120 Outlet pressure range of 0.5 to 42 bar. The Type PX/120 can be used as the pilot on single stage pressure reducing regulators or as the monitor pilot or as the working pilot in wide-open monitor systems. Type PX/120-P Outlet pressure range of 30 to 80 bar. The Type PX/120-P can be used as the pilot on single stage pressure reducing regulators or as the monitor pilot or as the working pilot in wide-open monitor systems. PX/ eries Type PX/125 dentical to the Type PX/120 except the restriction screw is removed. The Type PX/125 can only be used as the monitor override pilot on working monitor applications. Type PX/125-P dentical to the Type PX/120-P except the restriction screw is removed. The Type PX/125-P can only be used as the monitor override pilot on working monitor applications. The Type /2 Pilot supply filter regulator, provides a constant supply pressure to the PX eries pilot that is 3 bar over set pressure. The Type /2is equipped with a 5µ filtering degree filter and is suitable for heating. egulator or onitor Type pplication 1/4 NPT female threaded connections Operating onitor Type egulator onitor llowable Pressure P (bar) et ange W d (bar) PX/120 PX/120 PX/ PX-P/120 PX-P/120 PX-P/ ody and overs aterial teel urope, iddle ast and frica Only The Type /2 pressure pre-reducer must be used with PX/ eries pilots. Type /2 Type llowable Pressure P (bar) upplied Pressure ody and overs aterial / bar + Downstream pressure teel 1/4 NPT female threaded connections ooster alves odel 1/4 NPT female threaded connections llowable Pressure P (bar) et ange W d (bar) PX/ PX-P/ ody and overs aterial teel 12

13 Types Z and ZO egulators xamples of onnections TYP /2 TYP /2 TYP PX/120 TYP PX/120-P TYP PX/120 TYP PX/120-P TYP /2 TYP /2 TYP Z-O2 ONTO TYP Z GUTO Types Z-O2 onitor with O2 lam-hut and Z egulator TYP PX/120 TYP PX/120-P 4 DN TYP PX/120 TYP PX/120-P 6 DN urope, iddle ast and frica Only TYP Z ONTO TYP Z GUTO 4 DN 6 DN Types Z onitor and Z egulator nlet pressure egulator motorization pressure onitor motorization pressure tabilized pressure Outlet pressure To the heating system 13

14 Types Z and ZO egulators Overall Dimensions and Weights K DN 25, 50 and 80 DN 100 and 150 ndicator cover removal clearance J K ndicator cover removal clearance D G G F F DN 25, 50, 80, 100 and 150 J Types Z O2 and ZO O2 (ertical Position) G 25 mm echanism box removal clearance D F 25 mm echanism box removal clearance Types Z O2 and ZO O2 (orizontal Position) D G 25 mm echanism box removal clearance DN Weights, kg 150 / PN / PN 25 / PN For Type ZO O2 version add 1 kg. DN F F D 25 mm echanism box removal clearance Overall Dimensions, mm Diaphragm Piston ellows Diaphragm Piston ellows G urope, iddle ast and frica Only XU Overall Dimensions, mm DN PN 16 PN 25 PN 40 Type PX orizontal Type PX ertical D Type PX orizontal Type PX ertical Type PX orizontal J Type PX ertical K

15 Types Z and ZO egulators Overall Dimensions and Weights DN 25, 50 and 80 DN 100, 150 and 200 K ndicator cover K removal clearance ndicator cover removal ndicator clearance cover K removal clearance J J J K ndicator cover K removal clearance ndicator cover removal ndicator K clearance cover removal clearance DN 25, 50, 80, 100, 150 and 200 J J 115a Types Z and ZO (orizontal Position) Weights, kg DN 150 / PN / PN 25 / PN For Type ZO version add 1 kg. 116a urope, iddle ast and frica Only Types Z and ZO (ertical Position) XU Overall Dimensions, mm DN PN 16 PN 25 PN 40 Type PX orizontal Type PX ertical Type PX orizontal Type PX ertical Type PX orizontal J Type PX ertical K

16 Fisher.com Facebook.com/mersonutomationolutions inkedn.com/company/emerson-automation-solutions Twitter.com/emr_automation urope, iddle ast and frica Only merson utomation olutions mericas ckinney, Texas U T urope ologna 40013, taly T sia Pacific ingapore , ingapore T iddle ast and frica Dubai, United rab mirates T D104253X , 2018 merson Process anagement egulator Technologies, nc. ll rights reserved. 04/18. The merson logo is a trademark and service mark of merson lectric o. ll other marks are the property of their prospective owners. Fisher is a mark owned by Fisher ontrols nternational, a business of merson utomation olutions. The contents of this publication are presented for information purposes only, and while 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. ll sales are governed by our terms and conditions, which are available on request. We reserve the right to modify or improve the designs or specifications of our products at any time without notice. merson Process anagement egulator Technologies, nc does not assume responsibility for the selection, use or maintenance of any product. esponsibility for proper selection, use and maintenance of any merson Process anagement egulator Technologies, nc. product remains solely with the purchaser.