یکشنبه , آذر ۲۵ ۱۳۹۷
Home / شیر اطمینان اسپرینگ

شیر اطمینان اسپرینگ

Safety pilot valve

Safety Relief Valve

TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
SAFETY RELIEF VALVE
( SRV )
(LS-SS)Model
TH.E.CO
TOOS HENGAM ENGINEERING COMPANY
Professional In Systems Analysis
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
INLET BODY
BODY
CAP
BONNET
ADJUSTING SCREW NUT ADJUSTING SCREW ASSEMBLY
PIN
SPINDLE
SPRING PRESSURE
SPRING GUIDE DISC SPLIT RING
SECURING RING
GUIDE
Safety Relief Valve (Spring Loaded):
A spring loaded safety valve includes a control device which admits the pressurized
medium to a supplemental loading system which consists of a spring housing which
serves as a cylinder for a spring retainer which serves as a supplemental loading piston
that is arranged about two adjustable sleeves which are arranged around the valve stem
and which control the response pressure and the supplemental loading of the valve
spring.
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
How to Order
Numbering System
۵۲
۲
.
۲۵۴
۱ Type 52: Spring Loadedپ]Soft Seat
Type53: Spring Loadedپ] Metal Seat
Type 72: Pilot پ]Operated(VP10)
Soft Seat
Type 82: Pilotپ]Operated(HP10)
Soft Seat
۲ Material Code
۲پ]Stainless Steel
۳ پ]Carbon Steel
۳ Valve Code
Identifies orifice size and body
material, refer to table پgarticle
numbersپh
۱-Article
۵۲۲٫۲۵۴
۱ ۲ ۳
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
For Example: 522.254-66-V65-V69
Please state unit in Psig
Please refer to table
پgAvailable
connectionsپh on page 10.
Please state one option
code for each inlet and
outlet.
۲-Set Pressure 3-Connection
۶۶ Psig V65 V69
Set Pressure Connections
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
“““““““““““““““““““
Natural Gas
API 526
[SCMH] based on set pressure plus 10 % overpressure. Capacities at 30 psig
and bellow are based on 3 psig overpressure.
Relieving Pressure = Set Pressure + Over Pressure + Atmospheric Pressure
Capacity[SCMH] Relieving
Pressure(Psia)
Orifice Diameter (in)
۰٫۳۷۴ ۰٫۵ ۰٫۶۲۵ ۰٫۸ ۱
۱۵ ۵۹ ۱۰۵ ۱۶۵ ۲۷۰ ۴۲۲
۲۰ ۷۹ ۱۴۱ ۲۱۹ ۳۶۰ ۵۶۳
۳۰ ۱۱۸ ۲۱۱ ۳۳۰ ۵۴۰ ۸۴۴
۴۰ ۱۵۷ ۲۸۱ ۴۴۰ ۷۲۱ ۱۱۲۶
۵۰ ۱۹۷ ۳۵۲ ۵۵۰ ۹۰۰ ۱۴۰۷
۶۵ ۲۵۶ ۴۵۸ ۷۱۴ ۱۱۷۲ ۱۸۳۰
۸۰ ۳۱۵ ۵۶۳ ۸۸۰ ۱۴۴۲ ۲۲۵۲
۸۷ ۳۴۳ ۶۱۲ ۹۵۷ ۱۵۶۸ ۲۴۵۰
۱۰۰ ۳۹۳ ۷۰۴ ۱۱۰۰ ۱۸۰۲ ۲۸۱۵
۱۰۵ ۴۱۴ ۷۴۰ ۱۱۵۴ ۱۸۹۲ ۲۹۵۷
۱۲۵ ۴۹۲ ۸۸۰ ۱۳۷۴ ۲۲۵۲ ۳۵۲۰
۱۵۰ ۵۹۱ ۱۰۵۶ ۱۶۵۰ ۲۷۰۳ ۴۲۲۴
۱۷۵ ۶۸۹ ۱۲۳۱ ۱۹۲۴ ۳۱۵۳ ۴۹۲۷
۲۰۰ ۷۸۸ ۱۴۰۸ ۲۲۰۰ ۳۶۰۴ ۵۶۳۰
۲۲۵ ۸۸۶ ۱۵۸۴ ۲۴۷۵ ۴۰۵۴ ۶۳۳۴
۲۵۰ ۹۸۵ ۱۷۶۰ ۲۷۵۰ ۴۵۰۵ ۷۰۳۹
۲۷۵ ۱۰۸۳ ۱۹۳۵ ۳۰۲۴ ۴۹۵۵ ۷۷۴۳
۳۱۷ ۱۲۴۸ ۲۲۳۱ ۳۴۸۶ ۵۷۱۲ ۸۹۲۸
۳۵۰ ۱۳۷۸ ۲۴۶۳ ۳۸۵۰ ۶۳۰۶ ۹۸۵۴
۴۰۰ ۱۵۷۵ ۲۸۱۵ ۴۴۰۰ ۷۲۰۷ ۱۱۲۶۱
۶۰۰ ۲۳۶۲ ۴۲۲۳ ۶۵۹۸ ۱۰۸۱۱ ۱۶۸۹۲
۱۰۰۰ ۳۹۳۸ ۷۰۳۸ ۱۰۹۹۷ ۱۸۰۱۸ ۲۸۱۵۴
۱۱۰۰ ۴۳۳۲ ۷۷۴۲ ۱۲۰۹۷ ۱۹۸۲۰ ۳۰۹۷۰
۱۲۰۰ ۴۷۲۵ ۸۴۴۶ ۱۳۱۹۷ ۲۱۶۲۲ ۳۳۷۸۵
Safety Relief Valve
Capacities Metric Unit NATURAL GAS
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
Design of Safety Relief Valve
The development of a new series of API safety relief valves is only possible following extensive
investigation into fluid flows. This paper describes how a new method of پgFlow force پ] Characteristic پ] Measurementپh facilitated extensive review of the quality of the shape of all parts
in the flowing area and enabled parts to be optimized. Further, a worldپ]class test facility enabled
verification of the required characteristics for a larger range of pressures and sizes than needed
for an ASME certification. In addition to these measurements, special flow calculations provided
information about local fluid dynamics. Components in the flow area could therefore be
optimized with high accuracy. This has resulted in a new series of API safety relief valves with
ASME and TUV certification, providing significant advantages for end users.
Relation between flow force and spring
force is very important to designing
safety relief valve In these pictures you
can find some diagram that can help us to
choose suitable spring insafety relief
valve.
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
We can also simulate fluid flow inside of
safety relief valve by a suitable C.F.D method
An essential role in this optimization process
was played by numerical calculations of the
flow field in the safety valve with a CFD
program system according to the Finite Volume
Method. The calculations were carried
out for threeپ]dimensional compressible and
nonپ]compressible flow. The procedure was
carefully checked by means of flow shapes
known from the literature. Finally, these calculations
were confirmed very well by comparison
with experiments with compressible
supercritical flow at a plane valve model.
In figure 10 flow inside of safety relief valve
simulated by finite element method .in finite
element suitable grid is very important and
you can see this grid in picture.
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
Design Reliving System:
Safety valve series are proved with air, saturated steam and Natural Gas in accordance with the
requirements of ASME VIII in the course of a product approval. These tests are carried out on behalf of
ASME by the National Board (NB) in Columbus, Ohio, in the USA. The results are published for every
safety valve in the soپ]called پgRed Bookپh with the title پgPressure Relief Device Certificationsپh. This
document gives information which safety valves are certified with which pressure range and for which
flow quantities, e.g. according to the requirements of ASME VIII or of the size of the current nozzle
diameter do and the allowed discharge coefficient Kd, respectively. There are only very few
manufacturers worldپ]wide who cover the performance range of the API 526 with their safety valve
program, have the approval according to ASME VIII and are certified in accordance with the National
Board and may identify every API safety valve with the UV Stamp and the indication NB on the
nameplate. After the Bopp & Reuther API 526 safety valve series Si 81/83/84 (Figure 1) was approved
in this manner in 1995 the same series was also TUV type test approved with the type test approval
mark BKZ 1006 [3]. This TUVپ]approval also permits utilization of this safety valve according to the API
Standard in systems where a TUV approval is required.
Relief system is more than a safety relief valve or rupture disk, it includes:
۱پ]backup relief device
۲پ]line leading to relief device
۳پ]environmental conditioning of relief device
۴پ]discharge piping/header
۵پ]blowdowndrum
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
CALCULATIONS
Determine Relief Vent Area
GAS AND VAPOR SIZING:
.. ..
..پم……
۱٫۷۵……..۱….
A: minimum required effective discharge area, square inches.
C: variable factor, depending upon ratio of specific heats(k=Cp/Cv).
Kd: Effective coefficient of discharged =0.975 when a pressure relief valve is installed with or
without a rupture disk in combination.
Kb: Capacity correction factor due to back pressure for conventional and pilot operated
valves use a value for Kb equal to 1.0
M: Molecular weight og the gas or vapor obtained from standard tables
P1:Relieving pressure in pounds per square inch absolute. this is Set pressure +Over
pressure + Atmospheric pressure.
T:absolute temperature of the fluid at the valve inlet(F+460)
Z: Compressibility factor. Use Z=1.0 If valve is unknown
G: specific gravity of the gas and vapor at flowing conditions.
Q: Required relieving capacity in standard cubic feet per minute.
Z: Compressibility factor. Use Z=1.0 If valve is unknown
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
Sizing Correction Factor and Multipliers
Flow Factor for Vapors and Gases . Kb for Back Pressure Exceeding Critical
Back Pressure generally has no effect on the set pressure or flow capacity of THECO pilot
operated pressure relief valves except when flow is expected to be subcritical (absolute
back pressure exceeds 55% of the absolute relieving pressure).in this case the flow
correction factor Kb must be applied. If the ratio of absolute back pressure
Note: Consult the factory for back pressure greater than 70% of set pressure.
Pb/P1 = Back pressure percentage = …….. ……………. ………. …. …… …. ………………
…………………. ………. …………………….. …. …… …. ………………
EXAMPLE for determination of flow factor Kb:
Set Pressure = 150 Psig
Back Pressure = 100 Psig
Pb/P1 = Back Pressure Percentage = *100 =64% ……………
……………………
where Pb/P1 = 64% , Kb= 0.98
LIQUID SIZING
A = ..پم..
……………..پمƒ¢..
A: minimum required effective discharge area, square inches.
Q:Required relieving capacity in gallons per minute at flowing temperature.
ĢP : Differential pressure (PSI). this is the set pressure + overpressure . back pressure
Kv = Flow correction factor due to viscosity of the fluid at flowing condition.
Note: The minimum required effective orifice area shall be determined in accordance with
API 526 ,part I.
Pb/P1 Kb
۵۵ ۱٫۰۰
۶۰ ۰٫۹۹۵
۶۲ ۰٫۹۹
۶۴ ۰٫۹۸
۶۶ ۰٫۹۷
۶۸ ۰٫۹۶
۷۰ ۰٫۹۵
TOOS HENGAM ENGINEERING COMPANY
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
General Safety Guidelines
. For reliability and proper operation of a
safety valve it is necessary to assure proper
handling,storage, installation and
maintenance.
.When working at a safety valve which is
under pressure eye and ear protection must
be used. If the outlet of the valve leads to the
environment make sure that enough space is
protected so that nobody will be affected by
the blowing valve.
. Do not stand in front of the outlet!
. Before taking a safety valve off the vessel or
the pipe make sure that the pressure system is
absolutely pressureless.
. Does the safety valve work in high
temperature service let it cool down before
disassembly.
. On customers request safety valves can be
equipped with a test gag to block the valve.
This is only a test device. Never operate a
pressure system with a blocked safety valve.
. Only original THECO spare
parts must be used for maintenance and
repair.
Delivery Condition
. The safety valves delivered by THECO have
been tested in the factory, adjusted to the
required set pressure and sealed.
. The agreed guarantee expires if the seal is
removed without authorization by THECO
disclaims liability for work which is not
carried out by THECO staff. Even if it
has been carried out according to this
document.
Installation
. The inlet pipe to the safety valve must be
free of dirt like slivers, welding beads etc.. The
fluid to be discharged must be free of solids.
Otherwise the sealing surfaces will be
damaged which results in valve unپ]tightness.
. Remove protective caps from the inlet and
outlet flanges of the valve before installation!
Recommendation for installation:
Mounting of valve spindle in vertical
Position.
Maintenance
Check
. In regular time intervals the test of the set
pressure and the control of the smooth
running inside the guidance of the movable
parts must be carried out.
.The time interval depends on the operating
conditions and has to be defined by the
operator, at the latest, however, at the test of
the related pressure vessel.
Adjustment of the Set Pressure
. The safety valve is sealed against
unauthorized modification of the set pressure.
An adjustment of the set pressure may only be
carried out by well trained staff with the
presence of an inspector (contact the
manufacturer). The set pressure may be
adjusted within certain limits according to the
definition of THECO
Procedure
. Remove the seal between the bonnet and the
cap. Unscrew the cap Release the groove nut
Turning of the pressure screw clockwise
increases the set pressure, turning counter
clockwise decreases the set pressure.
THECO SAFETY RELIEF VALVE CATALOGUE
Doc.No.:THC109پ]۰۰
TOOS HENGAM ENGINEERING COMPANY
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