یکشنبه , آذر ۲۵ ۱۳۹۷
Home / شیر قطع کننده اضطراری

شیر قطع کننده اضطراری

Safety Shut Off Valve

                   

REGULATOR SAFETY SHUT OFF                 VALVE

( RSSV )

SM500 Model

 TH.E.CO

TOOS HENGAM ENGINEERING COMPANY

 

Professional In Systems Analysis

 

APPLICATION

The  THECO  Gas Pressure Regulator type SM500 integrated  with  Protection  System is  designed  to  reduce upstream pressure and  protect  equipments  downstream  of  a  pressure  reducing station in  a  gas  distribution  system.It consists  of  a   disk valve  &  closure  valve  complete  with  actuator  and  control  system  supplied  in  a  self contained  and  compact  unit.  It can be installed in pipeline upstream  of  the Cabinet/Flat type pressure  reducing gas station. So it is shut- off valve with regulator and for SM500 series II type there is a facility can be switch by user to regulator shut-off or shut- off device Which ever are necessary. According to this the SM500 regulator safety shut-off valve has two type of designation (type I & II). It regulate  and reduce pressure to desired pressure although if  there is  an  excessive  change  in  pressure  downstream  of  the  station due  to  an  equipment  or  operational  malfunction,  it  will react  by  shutting  off  the supply of  high  pressure  gas, the  pressure  switch  can  sense  either  rising  pressure, falling  pressure(ordered by client) or  both  as  specified .in fact it is regulator equipped with double shut off valves so with huge safety factor

MAIN PARTS

  • Closure Valve
  • Disk Valve
  • Control box (1st actuator)
  • ۲nd Actuator

     TECHNICAL SPECIFICATIONS

PI:UP TO 1600 psig INLET PRESSURE
۳۰۰# TO 600# CLASS RANGE
-۲۰ °C    TO   + ۶۰ °C OPERATING TEMPERATURE
NATURAL GAS,PROPANE,AIR,NITROGEN AND NON – CORROSIVE GASES ACCEPTABLE GASES
+ ۵% RSP & -10% RSP , + 3% SOPSP &

 – ۵%  SOPSP

ACCURACY

 

 

     SIZES & CONNECTIONS

 

DN 50,80,100,150,200,250 SIZES
۲۵ ,۵۱,۷۶,۱۰۲,۱۵۲,۲۰۳,۲۵۴,۳۰۵  Ф ORIFICE DIAMETER(mm)
SEE TABLE BODY LENGTHS
ANSI 300,600 FLANGES

 

    TYPE DESIGNATION

         SM500 I   ۱۰۰ B – 300/60

 

Family

A:300#

B:600#

 SOPSP/SUPSP

Series          DN Size             Pressure Class

I:R.S.S.O.V

II:R.S.S.O.V./S.S.O.V.

DIMENSIONS AND WEIGHT

ANSI300/600 ANSI 600 ANSI 300 NOMINAL SIZE
C D B H WEIGHT(Kg) A L WEIGHT(Kg) A L DN INCHES
۱۹۰ ۳۰۰ ۴۰۰ ۵۶۳ ۲۰ ۱۶۵ ۲۹۲ ۲۶ ۱۶۵ ۲۱۶ ۵۰ ۲″
۱۹۰ ۳۰۰ ۴۰۰ ۵۸۵ ۳۰ ۲۱۰ ۳۵۶ ۳۰ ۲۱۰ ۲۸۳ ۸۰ ۳″
۱۹۰ ۳۰۰ ۴۰۰ ۶۱۸ ۴۷ ۲۷۳ ۴۳۲ ۴۸ ۲۵۴ ۳۰۵ ۱۰۰ ۴″
۱۹۰ ۳۰۰ ۴۰۰ ۶۶۰ ۸۶ ۳۵۶ ۵۵۹ ۸۰ ۳۱۸ ۴۰۳ ۱۵۰ ۶″
۱۹۰ ۳۰۰ ۴۰۰ ۶۹۰ ۱۲۴ ۴۱۹ ۶۶۰ ۱۱۵ ۳۸۱ ۵۰۲ ۲۰۰ ۸″
۱۹۰ ۳۰۰ ۴۰۰ ۷۳۴ ۱۸۶ ۵۰۸ ۷۸۷ ۱۷۵ ۴۴۵ ۵۶۸ ۲۵۰ ۱۰″
۱۹۰ ۳۰۰ ۴۰۰ ۷۶۰ ۲۱۸ ۵۵۹ ۸۳۸ ۲۷۰ ۵۲۱ ۶۴۸ ۳۰۰ ۱۲″

MATERIALS

Material Part Name
C.S. BODY
St. St. 304 ,Al, CS ACTUATORs SSV
St .St./ AL CONTROL MECHANISM
 STAINLESS STEEL / AL/ ZINC COATED STEEL INTERNAL PARTS
NBR RUBBER/ VITON SEALS
NBR RUBBER RAINFORCED / BUNA N DIAPHRAGM
St. St. A17.4 RG. Disc
C.S. (Galvanized ) Spring
A216-WCB OR A351-CF8 Slam Shut Disk
C.S. Body Closure Valve
Brass Adjusting Screw
St. St. Name Plate
St. St. CONTROL BOX ACTU.

SPARE   PART

The spare parts are included as below table for each SM500:

QTY PART NUMBER Material Part Name ITEM
۱ ۹۰۰۰۰۵۷A NBR RUBBER RAINFORCED / BUNA-N DIAPHRAGM ۱
۱ ۹۰۰۰۰۵۸A NBR RUBBER/ VITON ORIFICE SEAT ۲
۱ ۹۰۰۰۰۵۹A BUNA-N ORIFICE O-RING ۳
۱ ۳۰۰۰۰۴۸A BUNA-N     SLEEVE ۴
۸ ۳۰۰۰۰۳۳A BUNA-N MANIFOLD O-RING ۵

IMPORTANT NOTES

Control Box:

 -The Regulator safety shut off valve SM500 series II can be switching by user to   regulator shut off   valve and shut off valve device separately.

-The pressure can be regulated by a regulator installed in the control box .

 -The pressure switch can sense either rising pressure.

-On  reaching  of  a  rising  pressure or  signal(SOPSP)  the  system  will  close the  pipeline valve very smoothly  and fast  .  

– The system is double shut off for more safety.

 – The system is contained within a stainless steel lockable box .  

 – Inlet gas system is filtered through a cartridge filter.

 – The  gas  pressure  is  then  controlled  via  a  pressure control valve  to  the  set     pressure.

-The outlet gas pressure is monitored using a pressure indicator  .

– The  hand lever valves  are  fitted  with  a  pressure  control  valve to  protect  equipment  on  the  output  side  of the  shut off valve

CALCULATION

To arrive at the correct Regulator Safety Shut-Off valve size, the KG characteristic should be read from the table below using the differential pressure between Pa and Pb  to obtain  maximum flow rate under standard condition Qp(MSCF).

In case of overcritical relief, the following formula applies:

Qp       =          Partial open valve capacity (SCFH), Standard cubic feet per hour

Nominal Diameter(Inches) KG
۲ ۱۹
۳ ۳۷
۴ ۶۷
۶ ۱۰۲
۸ ۱۶۱
۱۲ ۳۶۵

 

Pa        =          Upstream pressure

Pb        =          Downstream pressure

KG      =          Constant Value

G         =          Specific gravity of gas

  • SUBCRITICAL FLOW

 

 

Pa  = ۳۸۹٫۷۳ psia (375.00 psig + 14.73 psia)

Pb  =  ۵۹٫۷۳ psia (45.00 psig + 14.73 psia)

DP  = ۳۳۰ psi

KG  = ۶۴ (۲ inch valve From above table)

G   = ۰٫۶۴ sp. gr.

Qp  = ۲۱۲٫۴ MSCF

 

 

 

 

Safety Shut off Valve

Its system provides a fast and accurate response to flow rate variation.

The following accessories ease the use of SM500:

  • Manual shut-off button for emergency closing
  • Double shut-off valve
  • Easy to substitute Safety shut off valve or Regulator / Shut off valve optional device together

Actuator:

 Special equipments to control gas flow on the system. if gas pressure passed from restriction limitation automatically actuator disconnect the flow. so actuator is connected between gas source, regulator and shut off valve

Closure valve:

It contains two major parts, closure body and closure valve you can see these part in picture below .

Closure valve control by an actuator(1st actuator) is basically work such as pneumatic valve to control ultimate gas flow .

Disk valve:

 Disk valve is also another basically part in Safety Shut Off Valve because of more safety in shut off action, Disk valve place inside of body too, so if any valve has a problem another valve cover its duty.

to conform between different components of system .Disk valve is including three major part include Disk , Valve Body and Rod.

       Regulator Safety Shut Off Valve Function -Series II (ARSALAN)

Regulator:

THECO SM500 gas pressure regulator is designed to maintain outlet pressure at a constant level by equalizing fluctuations in inlet pressure or gas consumption. Under zero-flow condition, the control element is required to shut tightly. As the figure shows, the control element will open whenever the outlet pressure declines because of, for instance, an increase in consumption, while it will close whenever the outlet pressure increases. The energy needed for operating the control element is tapped directly from the flow of gas; auxiliary energy is not required.

The outlet pressure is registered by the comparator diaphragm of regulator .nominal outlet pressure is adjusted by manipulating the control spring.

If the outlet pressure drops below the set value because of an increase in consumption or for any other reason control pressure goes up. This causes the control element to open further, so that the outlet pressure rises again.

If the outlet pressure builds up beyond the set value, the control pressure goes down.                              

S.S.O.V Function

As soon as pressure rises beyond the set limit, the actuators command to switching valves to close and finally the governor is closed.

It recommended to use this type of regulator shut off valve in pressure reducing station Flat type.

Regulator Safety Shut Off Valve Function -Series I (PARNIAN)

 

Theco recommended regulator safety shut off valve series I to use in pressure reducing station cabinet type.

 

 

Installation

Before installing the pressure regulator in the piping, the following must be checked:

  • The upstream and downstream flanges must be parallel and the pressure regulating unit must be capable of being fitted without undue stress.
  • The upstream piping must be cleaned from all impurities (sand, welding slag, etc.)
  • The pressure regulator must not be visibly damaged.
  • The inlet and outlet chambers of the Regulator shut off valve must be perfectly

Clean.

  • the switch of shut off/regulator should be distinguished according to desired specifications and Gas station position.

After these checks have been made, the unit can be installed in the piping, making sure that the direction of gas flow corresponds to the arrow on the regulator shut off valve’s body .We recommend performing installation with the valve body in horizontal alignment.

Commissioning

R.S.S.O.V. SM500 series II (ARSALAN) 

The THECO SM500 has two commissioning according to the two optional device

  1. Safety Shut off Valve Mode
  • open the sensing line valves (No.6&7) then open the main valve. note that first you must slowly open drain valve before Safety shut off valve to prevent any pressure fluctuation.
  • Open the By-pass valve (No. 3) to have an equalized pressure at both sides of safety shut off valve.

 

  • Close the regulator switching valve (No.1).
  • Open the shut off switching valve (No.2).
  • Turn the valve button (No .4) to left, according to stainless steel user guide plate installed in the control box.
  • Turn the control valve handle (No. 5) to left in the middle of box according to stainless steel user guide plate installed in the control box.

Now the safety shut off valve is ready to be in service.

 

  1. B) Regulator Safety Shut off Valve Mode

 

  • Open the sensing line valves(No.6&7) then open the main valve. note that first you must slowly open drain valve before Safety shut off valve to prevent any pressure fluctuation.
  • Open the regulator switching valve (No. 1).
  • Close the shut off switching valve (No. 2).
  • Turn the button (No.4) to left, according to name plate user guide plate installed in the control box.
  • Turn the Control valve (No. 5) handle to left in the middle of box according to stainless steel user guide plate installed in the control box.

Now the Regulator safety shut off valve is ready to be in service.

While shutting off the gas line happened, it is possible for operator to start up regulator according to this procedure after solving the problems that almost occur in regulators.

R.S.S.O.V. SM500 series I

For THECO SM500 series I commissioning are according to the below explanation.

  • Open the sensing line valves (No.4&5) then open the main valve. note that first you must slowly open drain valve before Safety shut off valve to prevent any pressure fluctuation.
  • Turn the control valve button (No.1) to left, according to stainless steel user guide plate installed in the control box.
  • Turn the control valve handle (No.2) to left in the middle of box according to stainless steel user guide plate installed in the control box.

Now the regulator safety shut off valve is ready to be in service.

While shutting off the gas line happened, it is possible for operator to start up Regulator according to this procedure after solving the problems that almost occur in regulators.

 Professional in systems analysis         

                                                         P.O.Box : 91895-139

Tel/Fax :(+98 511) 6228988-9  

Web : www.theco.ir

E-mail : info@theco.ir

 

TH.E.CO

 

قالب وردپرس