PENBERTHY SERIES M WELD PAD FLAT GLASS GAGES
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 System description .................................. 2
3. Available models ........................................2-3
3.1 Design ratings .......................................... 3
4. Inspection ...................................................... 4
4.1 Glass inspection ....................................... 4
4.2 User's rating inspection .......................... 4
5. Installation ..................................................5-7
5.1 Preparation and disassembly prior
to welding ................................................. 4
5.2 Reassembly prior to welding with
steel spacer .............................................. 5
5.3 Welding ..................................................... 5
5.4 Disassembly-reassembly after welding 6
5.5 Nut torquing ............................................. 6
5.6 Belleville washers (optional) ................... 6
5.7 Differential thermal expansion ............... 7
5.8 Mirror viewing .......................................... 7
6. Operation ....................................................... 7
6.1 Hydrostatic test ........................................ 7
7. Maintenance ...............................................7-8
7.1 Maintenance procedures ........................ 8
7.2 Troubleshooting ....................................... 8
8. Removal - disassembly - reassembly ......8-9
8.1 Disassembly ............................................. 8
8.2 Inspection of glass seating surfaces ...... 9
8.3 Reassembly .............................................. 9
9. Disposal at end of useful life ........................ 9
10. Telephone assistance ................................... 9
11. Exploded parts diagrams ............................ 10
Tables and figures
Table 1 Design ratings .................................... 3
Table 2 Bolt torque values .............................. 6
Figure 1 Nut loosening sequence .................... 5
Figure 2 Nut tightening sequence ................... 5
Figure 3 Tack weld pad ..................................... 5
Figure 4 Bead weld pad .................................... 5
Figure 5 Belleville washer position.................. 6
Figure 6 Exploded parts diagram (TMW) ....... 10
Figure 7 Exploded parts diagram (RMW) ...... 10
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 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.
Emerson.com/FinalControl © 2017 Emerson. All rights reserved. VCIOM-04041-EN 18/06
PENBERTHY SERIES M WELD PAD FLAT GLASS GAGES
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 gage is handled, installed or
used and Emerson cannot and does not warrant
or guarantee that a gage is suitable or compatible
for the user's specific application.
WARNING
Contained fluids may be pressurized and can exit
vessel connections unexpectedly due to apparatus
or material failure. Safety glasses should be
worn when installing a weld pad liquid level gage.
Failure to follow instructions could result in
serious physical injury or property damage.
2 INTRODUCTION
Penberthy weld pad liquid level gages are
used to allow direct visualization of liquid level
in vessels. By peering through the glass, it is
possible to monitor color, clarity and level of
a gas/liquid interface. Gages are available in
varying lengths and configurations (flat pad or
radius pad). Visual indication can be enhanced
by using reflex glass. Weld pad liquid level
gages are mounted directly to the tank or
vessel to be measured.
2.1 System description
Penberthy weld pad gages comprise six basic
components. Each component may vary
slightly, depending on the desired physical and
mechanical properties for the gage. Use the
exploded parts view in Section 11 as additional
reference material.
Chamber: provides a pressure retaining
metallic surface for weld attachment to the
tank or vessel. Vessel chamber surface can be
radiused to match tank or vessel curvature.
Slot(s) are machined into the chamber to
provide direct visualization of the process fluid.
Gaskets: seal the gap and prevent leakage
between the chamber and the glass. Gaskets
are available in a variety of materials for
compatibility with the media in the gage.
Glass: allows for visual observation of the
process fluid in the chamber.
Cushion: acts as a protective buffer between
the glass and the cover. For proper sealing,
cushions must be as hard or harder than the
gasket material.
Cover: protects the glass assembly from
external hits and provides a flat, rigid surface
that is used to compress the gage assembly
evenly.
Bolting: compresses the components between
the covers and weld pad chamber.
Shield: (optional on transparent gages) used
to prevent the process media from contacting
the glass.
3 AVAILABLE MODELS
Penberthy medium pressure weld pad
(SeriesM) liquid level gages are designed for
applications other than steam/water. Weld pad
gages are frequently used in applications
where: 1) the contained liquid is not appropriate
for small diameter plumbing connections
(e.g., highly viscous liquid or large solid
particles) or 2) where the gage is installed in a
severe vibration environment.
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PENBERTHY SERIES M WELD PAD FLAT GLASS GAGES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
3.1 Design ratings at maximum and minimum operating temperatures
TABLE 1
Model RMW reflex and model TMW transparent
Gasket
material
®
(standard) or
Grafoil
non-asbestos
Top-chem 2000
25% glass filled PTFE 1-9 650 psig (4480 kPa) at -20°F (-29°C) to 100°F(38°C)
Buna N (NBR) 1-9 300 psig (2070 kPa) at -20°F (-29°C) to 100°F(38°C)
®
Viton
Teflon
PCTFE/(Kel-F
0.063" (1.6 mm) thick
®
(FKM) 1-9 300 psig (2070 kPa) at -20°F (-29°C) to 100°F(38°C)
®
(PTFE) 1-9 300 psig (2070 kPa) at -20°F (-29°C) to 100°F(38°C)
®
) shields
Glass
size
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1-9 300 psig (2070 kPa) at -20°F (-29°C) to 100°F(38°C)
Wetted parts material steel or stainless steel w/B7 bolting
-20°F (-29°C) to 100°F (38°C) 600°F (316°C)
2000 psig (13790 kPa)
1850 psig (12760 kPa)
1700 psig (11720 kPa)
1550 psig (10690 kPa)
1400 psig (9650 kPa)
1250 psig (8620 kPa)
1100 psig (7580 kPa)
950 psig (6550 kPa)
800 psig (5520 kPa)
2000 psig (13790 kPa)
1850 psig (12760 kPa)
1700 psig (11720 kPa)
1550 psig (10690 kPa)
1400 psig (9650 kPa)
1250 psig (8620 kPa)
1100 psig (7580 kPa)
950 psig (6550 kPa)
800 psig (5520 kPa)
150 psig (1030 kPa) at 500°F (260°C)
225 psig (1550 kPa) at 250°F (121°C)
180 psig (1240 kPa) at 400°F (204°C)
150 psig (1030 kPa) at 500°F (260°C)
180 psig (1240 kPa) at 400°F (204°C)
1480 psig (10200 kPa)
1375 psig (9480 kPa)
1260 psig (8690 kPa)
1145 psig (7890 kPa)
1035 psig (7140 kPa)
925 psig (6380 kPa)
810 psig (5580 kPa)
700 psig (4830 kPa)
590 psig (4070 kPa)
100 psig (690 kPa) at 500°F (260°C)
Note: lower temperatures are possible with metallic material variation, (e.g., 316/316L stainless
construction, Grafoil
®
gaskets/cushions useable to -325°F [-198°C]).
The pressure and temperature ratings may deviate from Table 1 if the gasketing materials of
construction and/or bolting are other than those specified. Higher and/or lower temperature
ratings are available with different materials of construction.
To determine the maximum allowable working pressure for a specific temperature within the
design limits stated in the table, the user should refer to relevant technical data sheets or, when
provided, the specifically stated design limits on a product proposal.
Note: under no circumstances should shields be used in reflex style gages. Installation of shields
in reflex style gages will keep the liquid from coming in contact with the refractive prisms, thereby
prohibiting visualization of the liquid level in the gage.
DANGER
NEVER exceed these design ratings or application data. Exceeding design ratings or application data
may result in mechanical failure of gage components resulting in death, serious personal injury and
property damage.
NOTE
Grafoil® is a registered trademark of Graftech.
Top Chem 2000® is a registered trademark of Klinger.
PCTFE (Formerly known as Kel-F®, a registered trademark of 3M) is manufactured by Daikin.
Viton® and Teflon® are registered trademarks of E.I. du Pont de Nemours and Company.
3
PENBERTHY SERIES M WELD PAD FLAT GLASS GAGES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4 INSPECTION
On receipt of a weld pad liquid level gage, 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.
Penberthy standard 1 section MW weld pad
gage consists of: (1) chamber, (1) gasket, (1)
borosilicate flat glass, (1) rubber band, (1)
cushion, (1) cover, (1) washer, (1) nameplate
and (6-14) bolting sets, depending on the size.
4.1 Glass inspection
The self stick caution tape was applied at the
factory to protect the glass during shipping,
handling and installation. Do not remove
the tape from the glass until all installation
procedures have been completed, except
during receiving inspection to inspect glass
momentarily for shipping damage. Glass that
is not protected will be vulnerable to dust, grit,
tools and any other objects which may scratch,
chip or break the glass.
WARNING
DO NOT use glass that is chipped or even slightly
scratched. Glass surface defects weaken the
glass, which may result in glass breakage and
fluid loss under pressure resulting in serious
personal injury or property damage.
4.2 User’s rating inspection
The user should confirm that:
1. The Series MW weld pad liquid level gage
model and assembly number stamped on
the nameplate conform 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 relevant technical data
sheet or product proposal referred to
previously.
4. The materials of construction of the gage
are compatible with the surrounding
atmosphere in the specific application.
5 INSTALLATION
Installation should only be undertaken
by qualified, experienced personnel who
are familiar with equipment of this type.
They should have read and understood all of
the instructions in this manual. The user should
refer to the relevant technical data sheet
or product proposal to obtain dimensional
information for the specific size and model of
weld pad liquid level gage.
The number of different types of weld pad liquid
level gage installations is too great to detail
adequately in an installation manual. Therefore,
it is the user's responsibility to assure that
knowledgeable installation personnel plan
and carry out the installation in a safe manner
following local, national and international
welding codes. The following procedures are
some of the installation guidelines that should
be employed:
5.1 Preparation and disassembly prior to
welding
Secure a workbench longer than the liquid level
gage, and sufficiently wide to lay out parts as
they are removed. If the weld pad chamber is
radiused, additional blocks may be required
to prevent the weld pad from rolling during
disassembly.
The Emerson factory assembles weld pad gage
nuts finger tight: 1) to prevent compression
'set' of gaskets and cushions and 2) to contain
assembly components and avoid loss of
separate pieces during shipment. Cushions,
glass, shields (if any) and gaskets can be
re-installed after welding in this instance only
because the gage has not been torqued at
assembly.
WARNING
Extreme care must be taken to avoid damage
tocushions, glass, shields (if any) and gaskets.
If any of these items are damaged in any way,
it could result in glass breakage with sudden
release of contained fluid causing serious
physicalinjury or property damage.
SAFETY INSTRUCTIONS
If the size, model or performance data of the
liquid level gage as received does not conform
with any of the criteria above, do not proceed with
installation. Contact an authorized Penberthy
distributor for assistance. The incorrect gage can
result in unacceptable performance and potential
damage to the gage.
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