Rego ESV Series User manual

112
Emergency
Shutdown Valves
RegO® E ergency Shutdown Valves (ESVs)
Why and how they should be used for Bobtail Filling
and Transport Unloading.
General Information
The primary purpose of Emergency Shut-Off Valves in bobtail filling
and transport unloading is to allow quick shut-off of liquid and vapor
flow in the event there is an accidental pull-away of a truck or a hose
rupture, both of which could cause a fire.
A system using Emergency Shut-Off Valves will not prevent some
spillage of liquid and vapor, but the total system should be constructed
so this spillage will be kept to a minimum.
Section 2-4.5.4 Emergency shutoff valves shall be approved and
incorporate all the following means of closing:
(a) Automatic shutoff through thermal (fire) actuation. When fusible
elements are used they shall have a melting point not exceeding 250°
F. (121° C).
(b) Manual shutoff from a remote location.
(c) Manual shutoff at the installed location.
This provision sets for the basic criteria for the emergency shutoff
valve, a key valve in the protection of many liquid transfer operations.
Actuating means for remote control may be electrical, mechanical or
pneumatic.
Many systems use a pneumatic system where the tubing itself acts as
a fusible element releasing the pressure holding the valve open. With
respect to the feature of manual shutoff at the installed location, it is
recommended that this valve be operated occasionally. Also, the sys-
tem should be tested periodically to determine that it will function
properly.
Section 3-2.7.9 on new installations, and by December 31, 1980 on
existing installations, (1) stationary single container systems of over
4,000 gal. (15.1 m3) water capacity, or (2) stationary multiple con-
tainer systems with an aggregate water capacity of more than 4,000
gal. (15.1 m3) utilizing a common or manifolded liquid transfer line,
shall comply with 3-2.7.9 (a) and (b).
(a) When a hose or swivel type piping 1½” or larger is used for liquid
transfer or a 1¼” or larger vapor hose or swivel type piping is used in
this service (excluding flexible connectors in such liquid and vapor
piping), and emergency shutoff valve complying with 2-4.5.4 shall be
installed in the fixed piping of the transfer system within 20 ft (6m) of
lineal pipe from the nearest end of the hose or swivel type piping to
which the hose or swivel type piping is connected. The preceding
sizes are nominal. Where the flow is only in one direction, a backflow
check valve may be used in lieu of an emergency shutoff valve if
installed in the fixed piping down-stream of the hose or swivel type
piping, provided the backflow check valve has a metal-to-metal seat or
a primary resilient seat with a secondary metal seat not hinged with
combustible material. When either a liquid or vapor line has two or
more hoses or swivel type piping of the sizes designated, either an
emergency shutoff valve or a backflow check valve shall be installed
in each leg of the piping.
(1) Emergency shutoff valves shall be installed so that the tempera-
ture sensitive element in the valve, or a supplemental temperature
sensitive element [250° F. (121° C) maximum] connected to actuate
the valve, is not more than 5 ft. (1.5 m) from the nearest end of the
hose or swivel type piping connected to the line in which the valve is
installed.
(b) The emergency shutoff valve(s) or backflow check valve(s) speci-
fied in 3-2.7.9 (a) shall be installed in the plant piping so that any
break resulting from a pull will occur on the hose or swivel type piping
side of the connection while retaining intact the valves and piping on
the plant side of the connection. This may be accomplished by use of
concrete bulkheads or equivalent anchorage or by the use of a weak-
ness or shear fitting. Such anchorage is not required for tank car
unloading.
This can be accomplished either by making possible, quick action by
the driver or plant personnel in closing the valves by manual remote or
pneumatic remote actuation; or in case of a pull-away, by automatic
closing of the liquid valve by means of a cable connected to the liquid
hose.
By minimizing the presence of liquid and vapor, the chance of a fire or
explosion will be reduced. In case of a fire, thermal links at the valves
or at other appropriate locations could close the valves and prevent
further release of liquid and vapor.
The valve closing systems will be discussed later in this section. The
user should decide which system is most appropriate, depending on
the piping configuration and the general layout of the filling/-unloading
area.
ESV Application for Bobtail Loading and Transport Unloading
A very important function of the typical LP-Gas storage plant is to
transfer LP-Gas into bobtails for delivery to customers. How efficient-
ly and rapidly these bobtails can be filled often determines the number
of customers that can be served each day, as well as how many bob-
tails are required to satisfactorily serve all customers. Therefore, the
selection of an ESV for the bobtail liquid loading line should be done
with care so as to maximize efficiency in filling and have year-round
dependability.
The RegO® 2” liquid ESV (6016) has a full open port so that the
restrictions of flow would be no more than you would expect through
an equivalent length of 2” schedule 80 pipe. To improve the overall effi-
ciency of the system, the valve was also designed as an operating
valve so it could replace an existing globe or angle valve already
installed at the end of the fixed piping. Thus, installing a RegO® ESV
could actually result in a more efficient pumping operation than the
existing system.
Equally important in the consideration of an ESV is its performance in
an emergency, especially bobtail pull-aways. According to the PGA,
it is the bobtail filling transfer process that produces almost 99% of all
bulk plant accidents and fires. Therefore, when selecting the proper
ESV for bobtail filling, also consider the dependability of performance,
and simplicity of operation and maintenance.
The RegO® ESV clearly indicates to the operator its open or closed
position. It allows full manual control by the operator and provides
means for remote operation in emergencies from either in front of the
valve or in the rear.
o complicated systems of pulleys and cables are necessary since
direct, straight pulls will close the valve. Means are even provided to
secure a length of cable to the transfer hose so as to produce an
automatic closing in the event the driver pulls away without discon-
necting the hose.
FPA Provisions (1986)
The pertinent provisions of FPA Pamphlet 58, as they apply to
Emergency Shut-Off Valves and how they are to be installed, are as fol-
lows:
These provisions have been interpreted by the ational Propane Gas
Association as to how bobtail filling and transport unloading stations
should be configured. The diagrams shown here are in essential con-
formance with PGA Bulletin 128-77.
LP-Gas E ergency Shut-Off Valves (ESV’s)

113
Emergency
Shutdown Valves
RegO® E ergency Shutdown Valves (ESVs)
LP-Gas E ergency Shut-Off Valves (ESV’s)
Installation Compliance with FPA Requirements
A valve that is approved as an ESV may be installed in the fixed piping
up to a distance of 20 feet (along the pipe) from the point where the
transfer hose is attached to the fixed piping.
However, when the ESV is located more than five feet from the end of
the fixed piping, an additional fusible element must be installed within
five feet of the point of attachment of the hose, and be connected to
the ESV valve in such a manner that it will cause the ESV to close in
the event of a fire.
The ideal location of the ESV is as close to the end of the fixed piping
as possible. This position eliminates the need for an additional fusible
element and cable, and it may also permit the elimination of a restric-
tive valve already installed at the end of the fixed piping.
To this point, our comments have been principally concerned with
ESV protection of the liquid line at bulk plants because this is the
area of greatest potential danger in the event of a pull-away or hose
rupture.
However, regulations also require an ESV in the vapor transfer line
when the vapor hose is 1¼” or larger. A helpful rule of thumb in deter-
mining whether or not an ESV control valve is required in your vapor
system is this: If the vapor flow is out of the storage tank, an ESV is
required. ESV systems are designed to protect the storage tank con-
tents against uncontrolled release.
Therefore, a bobtail loading system could use a 1¼” or larger back
pressure check valve in the vapor system since the flow of vapor is
always from the bobtail being filled back to the storage tank. To
improve transfer rates, the use of the RegO® 6586D back check valve
at this location would provide protection at minimum pressure drop.
If the bobtail vapor line is also used when unloading transports, then
the RegO® 6010 ESV should be used. The 6010 provides thermal
protection, manual closing and a remote emergency closing system
similar to the RegO® 2” liquid ESV, 6016.
Remote Control Systems
Usually in transfer loading operations, the valve handles and cables
are located in close proximity to the area of greatest potential danger
during an emergency. Therefore, each bobtail filling system or trans-
port unloading system should have installed in it at least one readily
accessible, alternate remote operating device.
Figure 2
RegO® E V’s with Remote Pneumatic
and Transfer Hose Cable Release
ystems Typical Installation
6010, 6016, 6024 E Vs

114
Emergency
Shutdown Valves
RegO® E ergency Shutdown Valves (ESVs)
1-1⁄4" Swing-Check ESV for Bulk Plants
Designed for installation in liquid or vapor transfer lines at LP-Gas or
Anhydrous Ammonia bulk plants to provide for quick shut-off of liquid or
vapor flow in the event of an accidental pull-away, line break, or hose
rupture.
2" & 3” Swing-Check ESVs for Bulk Plants
Designed for installation in liquid transfer lines at LP-Gas or Anhydrous
Ammonia bulk plants to provide for quick shut-off of liquid or vapor
flow in the event of an accidental pull-away, line break, or hose rupture.
Part Number For Use With: Inlet and Outlet
Connections
Liquid Flow Capacity at 10
PIG Drop (GPM)
6016 LP-Gas 2” F- PT 711 (LP-Gas)
AA6016 H32” F- PT 640 ( H3)
6024 LP-Gas 3” F- PT 1325 (LP-Gas)
AA6024 H33” F- PT 1173 ( H3)
UL
®
6024
6016
6010
Part Number For Use With Inlet and Outlet
Connections
Accessories Liquid Flow Capacity @ 10 P IG
Pressure Drop (GPM)
Remote Pneumatic Close Remote Pneumatic Open/Close
6010 LP-Gas 1¼” F. PT 6016-60D 6016-60C 259
AA6010 H31¼” F. PT 233
6016-60C
6016-60D
Part Number Description For Use With
6016-60D Remote Pneumatic Close
6010, AA6010, 6016, AA6016,
6024, AA6024
6016-60C Remoter Pneumatic Open/Close
6016-RA Rotary Remote Actuator
Swing-Check ESV Accessories
6016-RA

115
Emergency
Shutdown Valves
RegO® E ergency Shutdown Valves (ESVs)
ESV Pneu atic Controls
RegO® Emergency Shut-Off Valves modified for remote pneumatic
shutdown operation retain all the operating features of the standard
valves.
Once equipped with pneumatic cylinders and then pressurized, the
pneumatic cylinder piston rod disengages from a striker plate, allowing
the ESV to be manually opened and the striker plate to act as a latch
and hold the valve open. Release of the control system pressure for
any reason closes the ESV for fail-safe operation.
Features
Convenience
• Closes the liquid and vapor ESV from a convenient remote loca-
tion.
• Independent closed loop system allows the ESV to be pneumati-
cally charged, but opened or closed manually or with cable con-
trols to conserve pressurized gas.
Reliability
• Independent closed loop system will continue to hold pressure
and close ESV in an emergency - even if supply pressure is cut
off.
ecurity
• Any loss of pressure from the control line, such as accidents or the
line melting from fire, automatically shuts down the liquid and
vapor ESV.
• ESV must be reset after automatic shutdown.
UL
®
6016 with 6016-60D Remote Close Actuator
7605PN-50 Pneumatic Remote Control Kit
Control kit with components for connecting and charging the pneu-
matic controls from a source of compressed gas (air or nitrogen) to a
RegO® liquid or vapor ESV. Includes charging valves with low pres-
sure indicator, operating valves, 100 feet of ¼” plastic tubing and tube
fittings.
7781AFPN-1 Cylinder assembly kit to convert 7781AF ESVs to pneumatic shutdown.
6016-60D Cylinder assembly kit to convert 6016 ESVs to pneumatic shutdown.
7605PN-50 Pneumatic remote shutdown system kit, complete with 100’ of tubing, fittings, 1 charging valve assembly and 1 remote shutdown valve assembly
7605APN-8A Extra shutdown valve assembly
R A-PT AE 100’ roll of ¼” pneumatic tubing.
7605AP-16 ¼” tubing tee, with nuts.