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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
Before installation these instructions must be read fully and understood
Product warranty
Emerson warrants its Penberthy products
as designed and manufactured to be free
of defects in the material and workmanship
for a period of one year after the date of
installation or eighteen months after the date
of manufacture, whichever is earliest. Emerson
will, at its option, replace or repair any products
which fail during the warranty period due to
defective material or workmanship.
Prior to submitting any claim for warranty
service, the owner must submit proof of
purchase to Emerson and obtain written
TABLE OF CONTENTS
Product warranty ................................................ 1
1 About the manual .......................................... 2
2 Introduction ................................................2-3
2.1 Features and specifications................... 2
2.2 Design ratings ........................................ 2
2.3 Application data ...................................... 3
3 Inspection and performance confirmation .. 3
3.1 Receiving inspection .............................. 3
3.2 User's rating inspection ......................... 3
4 Installation ..................................................... 4
4.1 Mounting ................................................. 4
4.2 Sight glass installation........................... 4
4.3 Guard rod installation ............................ 4
5 Operation ....................................................... 4
5.1 Pre-operational check ........................... 4
5.2 Hydrostatic test ...................................... 4
5.3 Operating ................................................ 4
6 Maintenance ...............................................4-5
6.1 Preventative maintenance ..................... 5
6.2 Maintenance procedures ....................... 5
7 Removal - disassembly - reassembly ......5-6
7.1 Disassembly ........................................... 5
7.2 Reassembly ............................................ 6
8 Disposal at end of useful life ........................ 6
9 Telephone assistance ................................... 6
10 Exploded parts diagram ................................ 7
Tables and figures
Table 1 Design ratings .................................... 2
Table 2 Tubular glass ratings ......................... 3
Figure 1 Exploded parts diagram .................... 7
authorization to return the product. Thereafter,
the product shall be returned to Emerson, with
freight paid.
This warranty shall not apply if the product has
been disassembled, tampered with, repaired or
otherwise altered outside of Emerson's factory
or if it has been subject to misuse, neglect or
accident.
The responsibility of Emerson hereunder is
limited to repairing or replacing the product
at its expense. Emerson shall not be liable
for loss, damage or expenses related directly
or indirectly to the installation or use of
its products, or from any other cause or
for consequential damages. It is expressly
understood that Emerson is not responsible
for damage or injury caused to other products,
buildings, personnel or property, by reason of
the installation or use of its products.
This is Emerson’s sole warranty and in lieu of
all other warranties, expressed or implied which
are hereby excluded, including in particular all
warranties of merchantability or fitness for a
particular purpose.
This document and the warranty contained
herein may not be modified and no other
warranty, expressed or implied, shall be made
by or on behalf of Emerson unless made in
writing and signed by the company's general
manager or director of engineering.
valves.emerson.com © 2017 Emerson. All rights reserved. VCIOM-04036-EN 17/05
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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
1 ABOUT THE MANUAL
This manual has been prepared as an aid and
guide for personnel involved in installation or
maintenance. All instructions must be read and
understood thoroughly before attempting any
installation, operation or maintenance.
SAFETY INSTRUCTIONS
Emerson does not have any control over the
manner in which its gagecock set is handled,
installed or used and Emerson cannot and does
not warrant or guarantee that a gagecock set
is suitable or compatible for the user's specific
application.
WARNING
Failure to follow any instruction could possibly
result in a malfunction of the gagecocks, resulting in
leakage, severe physical injury or property damage.
2 INTRODUCTION
2.1 Features and specifications
Penberthy Series N6 gagecocks are supplied in
pairs (upper and lower) that house each end of
a transparent sight glass tube. This gagecock/
glass combination forms a gage that indicates
liquid level as well as liquid characteristics
accurately.
Standard features of Series N6 gagecocks
in non steam-water applications are: a ball
check shut-off to stop leakage of contained
fluid in case of accidental gage glass breakage,
integral bonnet, drain cock and handwheel.
Series N6 gagecocks are not suitable for
steam-water applications unless they are
furnished with one of the following optional
features:
1. Non-automatic gagecocks - ball checks
removed from both upper and lower
gagecocks.
2. Automatic gagecocks - vertical rising
ball check and ball inspection plug in
the lower gagecock in conjunction with a
steam cleaner in the lower gagecock stem.
The upper gagecock is equipped with a
horizontal ball check and a leaky ball seat
formed in the body.
WARNING
Under no circumstances should Series N6
gagecocks be used for steam-water applications
unless they are equipped with one of the above
optional features. Use of standard Series N6
gagecocks without these features may result in
sudden release of pressure, leakage of contained
fluid, severe physical injury or property damage.
2.2 Design ratings at maximum and minimum
operating temperatures (see Table 1)
To determine the maximum allowable working
pressure for a specific temperature within the
design limits stated below, the user should
refer to relevant technical data sheets or, when
provided, the specifically stated design limits
ona product proposal.
SAFETY INSTRUCTIONS
Under most circumstances, Series N6 gagecocks
are not recommended without the ball check
shut-off. Gagecocks without the ball check
shut-off feature will not stop leakage of contained
fluid in the event of accidental tubular glass
breakage. However, in circumstances where
the fluid being gaged tends to surge in a rapid
manner, the ball checks could tend to give a
false level reading or seat accidentally.
TABLE 1 - DESIGN RATINGS AT MAXIMUM AND MINIMUM OPERATING TEMPERATURES
Body material Glass packing material Maximum allowable working pressure Maximum steam pressure
Bronze Rubber (standard) 200 psig (1.38 mPa) at -20°F ( -29°C) to + 100°F (38°C)
190 psig (1.31 mPa) at +200°F ( 93°C)
Bronze PTFE (optional) 200 psig (1380 mPa) at -20°F ( -29°C) to + 100°F
125 psig ( 860 mPa) at +400°F (204°C)
NOTE
Pressure/temperature ranges in above table are subject to the limitations of the tubular glass. See Table 2.
125 (825 mPa)
125 (825 mPa)
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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
TABLE 2 - TUBULAR GLASS - RATINGS
⅝" (16 mm) AND ¾" (19 mm) OD
Vessel tappings Ctr. To Ctr.
distance In
NPS DN psig (mPa) psig (mPa) psig (mPa) psig (mPa) psig (mPa) psig (mPa)
10 (254) 410 (2.83) 600 (4.14) 340 (2.34) 310 (2.14) 345 (2.38) 275 (1.90)
15 (381) 385 (2.65) 600 (4.14) 310 (2.14) 280 (1.97) 325 (2.24) 265 (1.83)
20 (508) 355 (2.45) 600 (4.14) 285 (1.97) 265 (1.83) 315 (2.17) 260 (1.79)
25 (635) 300 (2.07) 580 (4.00) 260 (1.79) 250 (1.72) 300 (2.07) 250 (1.72)
30 (762) 275 (1.90) 550 (3.80) 230 (1.59)
35 (889) 240 (1.65) 500 (3.45) 200 (1.38)
40 (1016) 210 (1.45) 420 (2.90) 180 (1.24)
45 (1143) 200 (1.38) 360 (2.48) 170 (1.17)
50 (1270) 180 (1.24) 340 (2.34) 160 (1.10)
55 (1397) 150 (1.03) N/A 140 (0.97)
60 (1524) 140 (0.97) N/A 120 (0.83)
65 (1651) 125 (0.86) N/A 100 (0.69)
70 (1778) 100 (0.69) N/A 90 (0.62)
N/A - Not available
High pressure Heavy wall Red line High pressure Heavy wall Red line
Up to 150° F (66°C) From 150° F (66°C) thru 400° F (204°C)
2.3 Application data
Note: for specific application data, within the
above ranges, the user should consult the
product proposal for the specific model and
size gagecock set, or should request the supply
of the applicable technical data sheet.
WARNING
Under no circumstances should these design
ratings or application data be exceeded.
Exceeding design ratings or application data may
cause severe physical injury or property damage.
3 INSPECTION AND PERFORMANCE
CONFIRMATION
3.1 Receiving inspection
On receipt of gagecock set, check all
components carefully for damage incurred in
shipping. If damage is evident or suspected,
do not attempt installation. Notify the carrier
immediately and request a damage inspection.
3.2 User’s rating inspection
The user should confirm that:
1. The gagecock set model number and
pressure/temperature rating stamped on
nameplate (163) conforms to the description
on the user’s purchase order.
2. The operating conditions described in
the purchase order agree with the actual
operating conditions at the installation site.
3. The actual operating conditions at the
installation site are within the application
data shown on the applicable technical
data sheet or product proposal referred to
previously.
4. The materials of construction of the
gagecocks are compatible with both
the contained fluid and the surrounding
atmosphere in the specific application.
SAFETY INSTRUCTIONS
If the size, model or performance data of the
gagecock set as received does not conform with
any of the criteria above, do not proceed with
installation. Contact an authorized Penberthy
distributor for direction.
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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
4 INSTALLATION
Installation should only be undertaken by
qualified, experienced personnel who are
familiar with this equipment and have read
and understood all of the instructions in this
manual.
The user should refer to relevant technical
data sheets or product proposal to obtain
dimensional information for the specific size
and model of gagecock set.
4.1 Mounting
1. Prior to actual installation, turn handwheel
or lever of each gagecock clockwise until
stem closes against seat.
2. Mount upper and lower gagecocks to vessel
using PTFE tape on all male tapered pipe
thread connections.
3. Tighten vessel connections to a pressure
tight joint making certain that sight glass
connections are aligned vertically and to
vessel centers as called for on application
specification.
4.2 Sight glass installation
1. Turn upper gagecock counterclockwise
(approx. ⅛ turn).
2. Loosen glass packing nut to insure there is
no compressive force on glass packing.
3. Insert sight glass in upper gagecock sight
glass connection.
4. Tighten upper gagecock to original position
while holding sight glass in position with
upward force to insure its clearing of lower
sight glass connection. Check vertical
alignment of gagecocks.
5. Loosen glass packing nut on lower
gagecock and pull glass down into lower
gagecock sight glass connection to a
positive stop.
6. Tighten upper and lower glass packing nuts.
Note: in some circumstances, it may be
necessary to remove glass packing nut,
glass packing gland and glass packing, and
mount them on sight glass prior to insertion
of glass in upper and lower gagecock
bodies. See Figure 1 for proper assembly
sequences.
4.3 Guard rod installation
Guard rods (two required) are assembled
downward through upper gagecock with
swaged portion on rods at the top. Bottoms of
rods are positioned into respective holes in the
lower gagecock.
5 OPERATION
5.1 Pre-operational check
1. Assure that all installation procedures have
been completed.
2. Check to determine that all connections are
pressure tight.
5.2 Hydrostatic test
1. Take all precautions necessary to handle
the possibility of leakage during the test.
2. Hydrostatic pressure test all installations to
100 psig (690 kPaG) and correct any leakage
before proceeding.
5.3 Operating
Gagecock assemblies should be brought
into service slowly. The tubular glass used in
Penberthy gagecocks is tempered and can
stand minimal thermal shock and mechanical
stress.
To avoid excessive thermal shock or
mechanical stress on the tubular glass, the
connecting gagecocks should be opened
slightly and the tubular glass temperature and
pressure allowed to equalize slowly with the
vessel.
If the gagecocks are furnished with ball checks,
the gagecocks must be opened all the way after
the pressure and temperature have equalized
to permit operation of the automatic ball check
in the event of tubular glass breakage.
6 MAINTENANCE
Maintenance should only be undertaken by
qualified, experienced personnel who are
familiar with this equipment and have read and
understood all the instructions in this manual.
During system shut down, the gagecocks
should be left open to permit the gage to lose
pressure and cool with the rest of the system.
Failure to leave the gagecocks open during
system shut down will trap high pressure fluid
in the gage.
WARNING
Do not proceed with any maintenance unless the
gage has been relieved of all pressure or vacuum,
has been allowed to reach ambient temperature,
and has been drained or purged of all fluids.
Failure to follow any instructions could result in
severe personal injury or property damage.
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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
6.1 Preventative maintenance
The user must create maintenance schedules,
safety manuals and inspection details for each
specific installation of a gagecock set.
For purposes of maintenance on all
installations, the gagecocks should be
evaluated regularly for signs of:
1. Leakage around stem area.
2. Internal stem leakage.
3. Leakage around stuffing box connection.
4. Internal or external corrosion.
The user must determine an appropriate
maintenance schedule necessary for his or her
specific application upon evaluation of their own
operating experience. Realistic maintenance
schedules can only be determined with full
knowledge of the services and application
situations involved.
6.2 Maintenance procedures
1. Stem packing leakage can often be stopped
by tightening the stem packing nut. If
leakage persists, the stem packing should
be replaced by following steps 'a' through
'f' of Disassembly and 'a' through 'f' of
Reassembly instructions.
2. Signs of an internal stem leak is an
indication of a worn or damaged stem or
seat.
a. To replace the stem, follow disassembly
steps a through 'f' and reassembly steps
'a' through 'f'.
b. To renew the seat surface, follow
Disassembly steps 'a' through 'f'. Renew
seat by using a fine lapping compound
and a mandrel with the same size,
shape and seat angle as the stem. Flush
gagecock body clean and reassemble
by following steps 'a' through 'f' of
Reassembly.
Note: Series N6 gagecocks have an integral
seat. The gagecock body must be replaced
when the seat becomes worn or damaged
beyond repair.
3. Signs of leakage around the stuffing box
indicate worn out glass packing or improper
compression of glass packing. To replace
glass packing, follow Disassembly steps
'a', 'b' and 'g' through 'l' and Reassembly
steps 'a', 'b' and 'g' through 'm'. In the event
of improper compression, leakage can be
stopped by tightening the gage coupling nut.
4. Signs of internal or external corrosion could
be an indication of a misapplication. An
investigation should immediately be carried
out to determine the cause of the problem.
It is the user's responsibility to choose a
material of construction compatible with
both the contained fluid and the surrounding
atmosphere in the specific application.
5. For broken sight glass replacement, follow
Disassembly steps 'a', 'b' and 'g' through
'l' and Reassembly steps 'a', 'b' and 'g'
through 'm'.
SAFETY INSTRUCTIONS
New glass packing must be used when replacing
glass.
7 REMOVAL - DISASSEMBLY - REASSEMBLY
WARNING
Do not proceed with the disassembly of a gage
unless the gagecock has been relieved of all
pressure or vacuum, has been allowed to reach
ambient temperature, and has been drained
or purged of all fluids. Failure to follow any
instructions could result in severe personal injury
or property damage.
7.1 Disassembly
a. Close upper and lower gagecocks.
b. Open draincock and allow gagecocks to
drain.
c. Remove handwheel screw, nameplate and
handwheel or lever from stem.
d. Loosen and remove stem packing nut.
e. Remove stem by turning counterclockwise,
along with stem packing and stem packing
retainer.
f. Slip the stem packing and stem packing
retainer off the stem.
g. Remove guard rods if present.
h. Loosen glass packing nuts on both upper
and lower gagecocks.
i. Slide sight glass upward into upper
gagecock until bottom of tubular glass
clears the stuffing box connection on the
lower gagecock.
j. While holding the tubular glass in this
upward position, rotate upper gagecock
counterclockwise (approx. ⅛ turn) to allow
clearance to remove sight glass from upper
gagecock.
k. Remove sight glass from upper gagecock.
l. Remove glass packing nuts, glass packing
glands and glass packing from both the
upper and lower gagecocks.
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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
7.2 Reassembly
a. Refer to exploded view Figure 1.
b. Prepare for installation of new packing by
cleaning all packing chambers and glands
of upper and lower gagecocks.
c. Slip packing retainer on stem and install
new packing.
d. Thread stem assembly into gagecock by
turning clockwise until stem seats and then
back off one turn.
e. Assemble stem packing nut and tighten in
place.
f. Assemble handwheel or lever, nameplate,
and handwheel screw on stem and tighten
securely into place.
g. Replace glass packing nut, glass packing
gland and new glass packing on each end of
tubular glass.
h. With upper gagecock turned ⅛ turn
counterclockwise from vertical, insert
one end of sight glass into stuffing box
connection in upper gagecock to sufficient
depth to insure a clearance of lower
gagecock glass packing nut.
i. Tighten upper gagecock to original position
holding sight glass in place with upward
force to insure its clearing lower sight glass
connection. Check vertical alignment of
gagecocks.
j. Slide sight glass down into lower gagecock
sight glass connection to a positive stop.
k. Tighten glass packing nuts.
l. Close both gagecocks by turning handwheel
or lever clockwise until stem seats.
m. Replace guard rods.
Refer to Section 5 for operation of gagecock
when returned to service.
9 TELEPHONE ASSISTANCE
If you are having difficulty with your SeriesN6
gagecock, contact your local Penberthy
distributor. You may also contact the factory
direct at (956) 430-2500 and ask for an
applications engineer. So that we may assist
you more effectively, please have as much of
the following information available as possible
when you call:
Model #
Name of the company from whom you
purchased your gagecock
Invoice # and date
Process conditions (pressure, flow rates,
tankshape, etc)
A brief description of the problem
Trouble shooting procedures that failed
If attempts to solve your problem fail, you may
request to return your gagecock to the factory
for intensive testing. You must obtain a Return
Authorization (R.A.) number from Emerson
before returning anything. Failure to do so will
result in the unit being returned to you without
being tested, freight collect. To obtain an R.A.
number, the following information (in addition
to that above) is needed:
Reason for return
Person to contact at your company
'Ship-to' address
There is a minimum charge for evaluation
of non-warranty units. You will be contacted
before any repairs are initiated should the cost
exceed the minimum charge. If you return a
unit under warranty, but it is not defective, the
minimum charge will apply.
8 DISPOSAL AT END OF USEFUL LIFE
Penberthy gagecocks are used in a variety of
fluid applications. By following the appropriate
federal and industry regulations, the user
must determine the extent of preparation and
treatment the gagecock must incur before its
disposal. A Material Safety Data Sheet (MSDS)
may be required before disposal services
accept certain components.
Metal, glass and polymers should be recycled
whenever possible. Refer to order and
relevant technical data sheets for materials
ofconstruction.
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PENBERTHY SERIES N6 GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
10 EXPLODED PARTS DIAGRAM
FIGURE 1
PARTS LIST
Item Description
40 Rod
48 Glass
37 Nut, glass packing
35 Retainer, glass packing
34 Packing, glass
11 Body
15 Ball
17 Stem
18 Retainer, stem packing
25 Packing, stem
26 Nut, stem packing
28 Handwheel
163 Nameplate
100 Screw
RECOMMENDED SPARE PARTS
Item Description Min. qty.
18 Retainer, stem packing 2
25 Packing, stem 2
26 Nut, stem packing 1
34 Packing, glass 2
35 Retainer, glass packing 2
37 Nut, glass packing 1
48 Glass 1
Recommended maximun quantities should provide
spare parts for 10% of the gagecocks in service.
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