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PENBERTHY SERIES N7 GAGECOCKS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Before installation these instructions must be read fully and understood
TABLE OF CONTENTS
Product warranty ................................................ 1
1 About the manual..................................... 2
2 Introduction ............................................. 2
2.1 Features and specifications ........................ 2
2.2 Design ratings at max. and min.
operatingtemperatures .............................. 3
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 ............................................ 5
6.1 Preventative maintenance ........................... 5
6.2 Maintenance procedures ............................ 5
6.3 Removal - disassembly - reassembly ........ 5
7 Disposal at end of useful life ................... 6
8 Telephone assistance .............................. 6
9 Exploded parts diagram .......................... 7
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
authorization to return the product. Thereafter,
the product shall be returned to Emerson with
freight prepaid.
This warranty shall not apply if the product has
been disassembled, tampered with, repaired
or otherwise altered outside of the Emerson
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
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.
related
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.
Table of figures
Table 1 - Design ratings ................................... 2
Table 2 - Tubular glass ratings ........................ 3
Figure 1 - Mounting ............................................ 4
Figure 2 - Exploded parts diagram ................... 7
valves.emerson.com
© 2017 Emerson. All Rights Reserved. VCIOM-04075-EN 17/05
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PENBERTHY SERIES N7 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 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 for or
compatible with the user’s specific application.
WARNING
Failure to follow any instruction could possibly
result in a malfunction or failure of the gagecock
resulting in leakage causing serious personal injury
or property damage.
2 INTRODUCTION
2.1 Features and specifications
Penberthy Series N7 tubular glass gagecocks
are supplied in pairs (upper and lower) and are
designed to 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.
Important: Under most circumstances,
SeriesN7 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 gauged
tends to surge in a rapid manner, the ball
checks could tend to give a false level reading
or could seat accidentally.
Series N7 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.
Standard features of N7 gagecocks in non
steam-water applications are: a ball check
shut-off to stop leakage of contained fluid in
case of accidental tubular glass breakage,
integral bonnet, integral drain cock and
handwheel.
TABLE 1 - DESIGN RATINGS
Body material Model Glass packing Maximum allowable working pressure Maximum steam pressure
Bronze N7A Neoprene
Bronze N7B Neoprene
Iron N7A Neoprene
Iron N7B Neoprene
316 Stainless
Steel & Steel
N7A and
N7B
®
(Standard) 200 psig [1380 kPaG] at -20° F [-29°C] to +100° F [38°C]
®
(Optional) 200 psig [1380 kPaG] at -20° F [-29°C] to +100° F [38°C]
Teflon
®
(Standard) 400 psig [2760 kPaG] at -20°F [-29°C] to + 100°F [38°C]
®
(Optional) 400 psig [2760 kPaG] at -20°F [-29°C] to + 100°F [38°C]
Teflon
®
(Standard) 500 psig [3450 kPaG] at -20°F [-29°C] to +100°F [38°C]
®
(Optional) 500 psig [3450 kPaG] at -20°F [-29°C] to +100°F [38°C]
Teflon
®
(Standard) 500 psig [3450 kPaG] at -20°F [-29°C] to +100°F [38°C]
®
(Optional) 500 psig [3450 kPaG] at -20°F [-29°C] to +100°F [38°C]
Teflon
®
Neoprene
Teflon® (Optional) 500 psig [3450 kPaG] at -20°F [-29°C] to +500°F [260°C] 350 [2410 kPaG]
(Standard) 500 psig [3450 kPaG] at -20°F [-29°C] to +300°F [149°C] 350 [2410 kPaG]
165 psig [1140 kPaG] at +300°F [149°C]
125 psig [860 kPaG] at +400°F [204°C]
335 psig [2310 kPaG] at +300°F [149°C]
250 psig [1720 kPaG] at +400°F [204°C]
375 psig [2590 kPaG] at +300°F [149°C]
250 psig [1720 kPaG] at +450°F [232°C]
375 psig [2590 kPaG] at +300°F [149°C]
250 psig [1720 kPaG] at +450°F [232°C]
125 [860 kPaG]
125 [860 kPaG]
250 [1720 kPaG]
250 [1720 kPaG]
350 [2410 kPaG]
350 [2410 kPaG]
350 [2410 kPaG]
350 [2410 kPaG]
Pressure/temperature ranges in above table are subject to the limitations of the tubular glass.
See Table 2.
Teflon® and Neoprene® are registered trademarks of E. I. duPont de Nemours and Company.
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PENBERTHY SERIES N7 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
Inches [mm] psig [kPaG] psig [kPaG] psig [kPaG] psig [kPaG] psig [kPaG] psig [kPaG]
10 [254] 410 [28 30] 60 0 [4140] 340 [2340] 310 [2140] 345 [2380] 275 [1900]
15 [381] 385 [2650] 60 0 [4140] 310 [2140] 280 [1930] 325 [2240] 265 [1830]
20 [508] 355 [2450] 60 0 [4140] 285 [1970] 265 [1830] 315 [2170] 260 [1790]
25 [635] 300 [2070] 580 [4000] 26 0 [1790 ] 250 [1720] 300 [2070] 250 [1720]
30 [762] 27 5 [19 00] 550 [3790] 2 30 [159 0]
35 [889] 240 [1650] 500 [3450] 20 0 [13 80]
40 [1016] 210 [1450] 420 [2900] 180 [1240]
45 [1143 ] 200 [1380] 360 [24 80] 170 [1170]
50 [1270] 180 [124 0] 340 [2340] 16 0 [110 0]
55 [1397] 150 [103 0] N/A 140 [970]
60 [1524] 140 [970] N/A 120 [830]
65 [1651] 12 5 [860] N/A 100 [690]
70 [1778] 100 [690] N /A 90 [620]
High pressure Heavy wall Red line High pressure Heavy wall Red line
N/A - Not Available
Up to 150°F (66°C) From 150° F (66°C) thru 425°F (218°C)
WARNING
Under no circumstances should N7 gagecocks be
used for steam-water applications unless they are
equipped with one of the optional features. Use
of standard N7 gagecocks without these features
can result in sudden release of pressure causing
serious personal injury or property damage.
2.2 Design ratings at maximum and minimum
operating temperatures
To determine the maximum allowable working
pressure for a specific temperature within the
design limits stated in Table 1, the user must
refer to applicable technical data sheets, or
when provided, the specifically stated design
limits on a product proposal.
2.3 Application data
Note: For specific application data, within the
above ranges, consult the product proposal for
the specific model and size gagecock set, or
request the supply of the applicable technical
data sheet.
WARNING
Never exceed these design ratings or application
data limits. Exceeding design ratings or
application data limits can cause serious personal
injury or property damage.
3 INSPECTION & PERFORMANCE
CONFIRMATION
3.1 Receiving inspection
Upon receipt of a 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 is to confirm:
1. That the gagecock set model number and
pressure/temperature rating stamped on
nameplate (163) conform to the description
on the user’s purchase order.
2. That the operating conditions described in
the purchase order agree with the actual
operating conditions at the installation site.
3. That 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 above.
4. That the materials of construction of the
gagecocks are compatible with both the
contained fluid and surrounding atmosphere
in the specific application.
Important: 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 N7 GAGECOCKS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4 INSTALLATION
Use only qualified, experienced personnel who
are familiar with this equipment and thoroughly
understand all the instructions in this manual
for the installation of this equipment. 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
the stem closes against the seat.
2. Mount upper and lower gagecocks to vessel
using PTFE tape, or equivalent, on all
male pipe thread connections as shown in
Figure1.
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 the
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 up into upper gagecock
sight glass connection.
4. Tighten upper gagecock to its original
position while holding sight glass 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
sight glass connection to a positive stop.
6. Tighten upper and lower glass packing nuts.
5 OPERATION
5.1 Pre-operational check
1. Check 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.
2. Hydrostatic pressure test installation to at
least 100 psig (690 kPaG) or gage limit and
correct any leakage before proceeding.
5.3 Operating
WARNING
Gagecock assemblies should be brought into
service slowly to avoid excessive shock or stress
on the tubular glass. Rapid pressurization of a
gagecock assembly can cause glass breakage
with resulting sudden release of pressure causing
serious personal injury or property damage.
To avoid excessive thermal shock or
mechanical stress on the tubular glass, the
connecting gagecocks should be opened
slightly and the gage 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 gage failure.
FIGURE 1
Tape
1-2
threads
Direction of
wrap
Note: In some circumstances, it may be
necessary to remove glass packing nut, glass
packing retainer and glass packing, and mount
them on sight glass prior to insertion of glass
into upper and lower gagecock bodies. See
Figure 2 for proper assembly sequence.
4.3 Guard rod installation
Guard rods (four required) are assembled
downward through the upper gagecock with
swaged portion on rods at the top. Bottom of
rods are positioned into respective holes in the
lower gagecock.
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PENBERTHY SERIES N7 GAGECOCKS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
6 MAINTENANCE
Use only qualified, experienced personnel who
are familiar with this equipment and
understand all the instructions in this manual
for all maintenance thoroughly.
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 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 do so can cause serious
personal injury or property damage.
6.1 Preventative maintenance
Create maintenance schedules, safety manuals
and inspection details for each specific
installation of a gagecock set.
For maintenance purposes on all installations,
check gagecocks regularly for signs of:
1. leakage around stem area.
2. an internal stem leak.
3. leakage around stuffing box connections.
4. internal or external corrosion.
Upon evaluation of your own operating
experience, determine an appropriate
maintenance schedule necessary for the specific
application. Realistic maintenance schedules
can only be determined with full knowledge of
the services and application situation 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 steps 'a' through 'f' of
Reassembly.
2. Signs of internal stem leak is an indication
of a worn or damaged stem or seat.
A. To replace stem, follow Disassembly
steps 'a' through 'f' and Reassembly
steps 'a' through 'f'.
B.
To renew 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 N7 gagecocks have an integral
seat. Gagecock body must be replaced when
seat becomes worn or damaged beyond repair.
3. Signs of leakage around the stuffing
box indicates 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
'n'. In the event of improper packing
compression, leakage can be stopped by
tightening glass packing nut.
4.
It is the user’s responsibility to choose a
material of construction compatible with
both the contained fluid and surrounding
atmosphere in the user’s specific application.
If internal or external corrosion are present,
an investigation must be carried out
immediately by the user as to the cause of
the problem, including consulting with an
authorized Penberthy distributor.
5. For broken sight glass replacement, follow
Disassembly steps 'a', 'b' and 'g' through
'l', and Reassembly steps 'a', 'b' and 'g'
through 'n'.
Important: New glass packing must be used
when replacing glass.
6.3 Removal - Disassembly - Reassembly
WARNING
Do not proceed with the disassembly of a gagecock
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 comply can cause
serious personal injury or property damage.
1. Disassembly
a. Close upper and lower gagecocks.
b. Open drain cock 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 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 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 , glass packing and glass
packing retainers from both upper and
lower gagecocks.
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PENBERTHY SERIES N7 GAGECOCKS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
2. Reassembly
a. Refer to exploded view Figure 2.
b. Prepare for installation of new packing
by cleaning all packing chambers and
glands of upper and lower gagecocks.
c. Slip stem packing retainer (18) on stem
(17) and install new stem packing (25).
d. Thread stem assembly into gagecock by
turning clockwise until stem seats and
then back off one turn.
e. Assemble stem packing nut (26) and
tighten in place.
f.
Assemble handwheel (28) or lever (261),
nameplate (163) and handwheel screw
(100) on stem and tighten securely into
place.
g. Replace glass packing nut (37), glass
packing gland (36), new glass packing
(34) and glass packing retainers (35) on
each end of tubular glass (48).
h. Insert glass packing retainer (35A) into
stuffing box of lower gagecock.
i. 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 clearance of
lower glass packing nut.
j. Tighten upper gagecock to original
position while holding sight glass in place
with upward force to insure its clearing
lower sight glass connection. Check
vertical alignment of gagecocks.
k. Slide sight glass down into lower
gagecock sight glass connection to a
positive stop.
l. Tighten glass packing nuts.
m. Close both gagecocks by turning
handwheel or lever clockwise until stem
seats.
n. Replace guard rods (40).
8 TELEPHONE ASSISTANCE
If you are having difficulty with your Series
N7 gagecocks, contact your local Penberthy
distributor. You may also contact the factory
direct at (956) 430-2500 and ask for an
applications specialist. 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 the N7 gagecocks
- Invoice # and date
- Process conditions (pressure, flow rates, tank
shape, etc)
- A brief description of the problem
- Troubleshooting procedures that failed
If attempts to solve your problem fail, you may
request to return your N7 gagecocks 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.
3. Refer to Section 4 'Installation' and
Section5 'Operation of gagecock' when
returning to service.
7 DISPOSAL AT END OF USEFUL LIFE
Penberthy Series N7 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 N7 gagecocks
must incur before their 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
applicable technical data sheets for materials
of construction.
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PENBERTHY SERIES N7 GAGECOCKS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
9 EXPLODED PARTS DIAGRAM
FIGURE 2
PARTS LIST
Ref # Item
11 Body
14 Retainer, ball
15 Ball
17 Stem
18 Retainer, stem packing
25 Packing, stem
26 Nut, stem packing
28 Handwheel
34 Packing, glass
35 Retainer, glass packing
35A Retainer, glass packing
36 Gland, glass packing
37 Nut, glass packing
40 Rod
47 Stem, drain
48 Glass
100 Screw
163 Nameplate
261 Lever
RECOMMENDED SPARE PARTS
Ref. no. Item Min. qty.
18 Retainer, stem packing 2
25 Packing, stem 4
26 Nut, stem packing 1
34 Packing, glass 2
35 Retainer, glass packing 2
35A Retainer, glass packing 1
37 Nut, glass packing 1
48 Glass 1
Note: Part No. 35A Retainer, glass packing, on
lower gagecock only.
Recommended maximum quantities should
provide spare parts for 10% of the gagecocks
in service.
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