Valve Concepts 3000 SERIES User manual

INSTALLATION, OPERATION AND MAINTENANCE MANUAL IOM-3400
10-20
SECTION I
I. 3000 SERIES DESIGN AND FUNCTION
Model 3400
Pressure Relief Vent
Models 3100 through 3600 Pressure and /or Vacuum
Vents are used for the normal venting requirements.
Normal venting is defined as venting required
because of operational requirements (i.e. filling and
emptying the tank) or atmospheric changes. Models
3700 and 3800 Emergency Relief Vents are used to
meet venting required when an abnormal condition,
such as an external fire or such as ruptured internal
heating coils, exist either outside or inside the tank.
All of these devices are sized in accordance with API
Standard 2000. Improperly specified relief vents may
result in structural damage to the tank or system and
can cause severe personal injury or death.
Figure 1 illustrates the operation of the Pressure/
Vacuum Relief Vent under overpressure conditions.
As the tank pressure increases as a result of product
being pumped into the tank and/or because of thermal
expansion of the product and vapors, the pressure
pallet remains closed until the set pressure of the
vent is reached. When the tank pressure reaches the
pressure setting of the vent, the pressure pallet lifts
allowing the tank pressure to bleed off.
Figure 2 illustrates the operation of the Pressure/
Vacuum Relief Vent under vacuum conditions.
As the tank pressure decreases as a result of product
being pumped out of the tank and/or because of
thermal contraction of the product and vapors, the
vacuum pallet remains closed until the set vacuum of
the vent is reached. When the tank vacuum reaches
the vacuum setting of the vent, the vacuum pallet lifts
allowing air to be drawn into the tank.
MODEL P V DESCRIPTION
3100 P V Vent to Atmosphere
3200 P V Vent to Header
3300 V Top Mounted
3400 P Vent to Atmosphere
3500 P Vent to Header
3600 V Side Mounted
3700 P Emergency/Manhole Cover
3800 P Emergency/Top Guided Relief
Figure 1 - Pressure Relief Figure 2 - Vacuum Relief
ISO Registered Company

2IOM-3400
CAUTION
DO NOT attempt to remove the vent from the tank or
process vessel without first bleeding all pressure from
the system. ALTERNATIVE MEANS OF PRESSURE
RELIEF MUST BE PROVIDED WHEN THE VENT IS OUT
OF SERVICE.
III. INSPECTION AND STORAGE
The pressure/vacuum relief vent is carefully packaged
to prevent damage or contamination during shipping.
Inspect the equipment when it is received and report
any damage to the carrier immediately. The vent
should be stored with all the protective flange covers
CAUTION
DO NOT change pressure ratings by adding additional
weights to the pallet assembly without consulting
Cashco Inc. or your VCI representative.
The 3000 Series Vents are designed to mate to a
flange. Torque guidelines are provided in Table 1. The
Vents are NOT rated for full flange pressure and do
not require high bolting torque.
Before installing the 3000 Series Vent, remove all
packing materials from inside and outside the vent. If
loading weights were shipped separate from the vent,
make sure to install on the appropriate pallet.
WARNING
The vent must be installed in a vertical position as
shown in Figure 1. The tank nozzle on which the vent
is mounted should have the same nominal diameter as
the venting device. It is recommended that the tank
nozzle flange face be within 1 degree of horizontal for
best performance of the venting device.
II. SAFETY WARNINGS
Tank or system protection is the primary function of
the weight loaded Pressure and/or Vacuum Relief
Vent. It must be selected to meet the total pressure
and vacuum flow requirements within the Maximum
Allowable Working Pressure and Vacuum of the
system on which it is installed. Consult API Standard
2000 for tank protection sizing procedures. Improperly
specified relief vents may result in structural damage
to the tank or system and can cause severe personal
injury or death.
When Pipe-Away relief vents are used, back
pressure in the header system will affect the set point
of weight loaded vents by the amount of the header
pressure. Maximum possible header pressure must
be considered when sizing the pressure relief vent.
SECTION II
SECTION III
in place. Make sure that any loading weights that
might have been shipped separately, to protect the
vent during shipping, are accounted for and stored
with the vent. These weights, when required, will be
installed during installation. See Section IV.
SECTION IV
IV. INSTALLATION
NOTE: Wipe down the Seat Ring and Diaphragm
when all the packing materials have been removed.
Inspect the gasket seating surface of the tank nozzle
flange. It must be clean, free of scratches, corrosion,
tool marks and flat.
FRP and Aluminum vents are furnished with flat
faced flanges. It is recommended that they be
installed on mating flat face flanges with a full faced
gasket. If the flat face of the vent is sealing against
a raised face steel flange, a spacer or filler ring must
be used to fill the annular space of the raised face
steel flange.
Make sure the gasket is suitable for the application
and is in good condition.

3
IOM-3400
Fiberglass flanges 2 inch to 12 inch require the use
of a full-face 150 lb. gasket. For full face gaskets,
we recommend the use of a 1/8-inch Gortex gasket.
Center the gasket within the bolt circle of the tank
flange and carefully set the vent on the flange nozzle
and align the bolt holes.
NOTE: At installation, the vent valve should be care-
fully lifted into position using the lifting brackets (2)
on the body.
All stud threads must be lubricated to obtain proper
torque results. A washer should be used under each
stud nut.
Install the studs, washers and nuts and tighten nuts
hand tight. Check proper alignment of flange faces.
Misalignment of flange faces will cause bending
stresses at the flange and flange joint and damage
may result. Correct any misalignment prior to
applying torque to nuts.
All nuts must be tightened in proper sequence and
equal increments. Proceed through the tightening
sequence until the recommended torque is attained.
Recheck the torque on each bolt in the same
sequence as bolts previously tightened may have
relaxed through the torque sequence.
WARNING
Minimum clearance between tank roof and vacuum
inlet port must be at least equal to the vents’ nomi-
nal flange bore. Tank nozzle bore must be greater
than or equal to vent inlet flange bore. Inlet and out-
let piping loads must be supported by appropriate
structural supports, NOT by the vent body.
*Blind tapped holes only (Models 3100, 3200, and 3300). Use standard ASME stud length for other holes.
TABLE 1
All Torque Requirements Are Dependant On Gasket Material
Bolt Torque and Stud Specifications - ASME #150 Flange Connections
MOUNTING
FLANGE
BOLT
TORQUE -
Ft. lbs.
NUMBER
BOLTS
TOTAL
STUD SPECIFICATIONS
FLAT FACE THREAD UNC STUD LENGTH *QUANTITY *
2” 20 4 5/8” - 11 2.50” 2
3” 20 4 5/8” - 11 2.75” 2
4” 20 8 5/8” - 11 2.75” 4
6” 30 8 3/4” - 10 3.00” 4
8” 30 8 3/4” - 10 3.00” 4
10” 30 12 7/8” - 9 3.50” 6
12” 30 12 7/8” - 9 3.50” 6
Bolt Torque and Stud Specifications for FRP Flanges Drilled to ASME #150 Flange Connections
MOUNTING
FLANGE
BOLT TORQUE -
Ft. lbs.
NUMBER
BOLTS
TOTAL
STUD SPECIFICATIONS
THREAD UNC STUD LENGTH *QUANTITY *
2”
47
4 5/8” - 11 2.50” 2
3” 4 5/8” - 11 2.75” 2
4” 8 5/8” - 11 2.75” 4
6” 83 8 3/4” - 10 3.00” 4
8” 8 3/4” - 10 3.00” 4
10” 134 12 7/8” - 9 3.50” 6
12” 12 7/8” - 9 3.50” 6
CAUTION
The lifting brackets should only be used for lifting the
vent valve into place and should NOT be used for any
other purpose.

4IOM-3400
V. MAINTENANCE
Tank or system protection is the primary function
of the weight loaded Pressure and/or Vacuum
Relief Vent. As a safety device, it is very important
that maintenance/inspection be done on a regular
interval. Maintenance should only be done by a
qualified technician. Valve Concepts recommends
that all service be performed at the factory or a
factory authorized repair center. For information on
repair centers in your area, please contact factory.
To Dis-assemble: Remove the weatherhood wing
nuts (7) and washers (72) and lift off weatherhood
(17) and bug screen (27).
Inspect weatherhood, and bug screen for corrosion,
damage, or product build up. Clean with a suitable
solvent, replace if necessary.
Remove pallet (4) assembly, including any loading
weights (18) that may be on the pallets (4).
Clean and inspect pallet assembly. Inspect the
diaphragm (5) and replace if necessary.
To Replace Diaphragms: Place stem (10) in a vise
with threaded end up. Remove cotter pin (61), nut
(23), lock-washer (19) and washer (24).
Lift up to remove diaphragm plate (6) and diaphragm
(5). NOTE: Apply TFE paste to threads of the stem
and around hole on the pallet (4).
Install new diaphragm (5). Re-install diaphragm
plate (6), washer (24), lock-washer (19) and tighten
nut (23) on stem. Insert cotter pin (61) through hole
in stem and secure.
Inspect and clean seat ring (3). Check seat surface
for any nicks, corrosion, pitting or product build up.
Seat surfaces must be clean and smooth for vent to
perform properly.
To Remove Seat Ring/Gasket: Rotate bolts (11)
CCW and remove. Remove supports (16), spacers
(69) (Use flats on the supports and rotate CCW.)
Mark the location of supports on the seat ring (3) for
reference at re-assembly.
Lift up to remove seat ring (3) and gasket (13).
Inspect supports (16) and inside of the body cavity
(1) for any corrosion or product build up. Clean if
necessary.
Apply TFE paste to both sides of new gaskets and
install in body (1).
Re-assemble vent in reverse order, making sure
that the pallet and loading weights are in their proper
location. Tighten bolts (11) and supports (16) to 15
ft. lbs. (20.3 Nm). When installing the weatherhood,
ensure the stem (10) is inserted in the stem guide.
WARNING
When assembling the vent, ensure that the stem is
straight and fits into the guide in the weatherhood.
If the stem is cocked at an angle, pallet lift may be
completely blocked. An over-pressure can occur. This
can cause a tank failure, severe personal injury and
material damage.
SECTION V

5
IOM-3400
SECTION VI
VI. TEST PROCEDURE
To Calculate Weight of Pallet Assembly:
Table 2 shows the pallet weight per unit of pressure
or vacuum setting. The total pallet assembly weight
is determined by multiplying the desired set point (in
the appropriate units) by the incremental weight per
unit listed in Table 2.
For Example:
4” Model 3404 CS - if the desired setting is 5 oz/in2
Table 2 shows that for a 4” vent, the pallet would
weigh 2.05 lb per oz/in2
So the pallet assembly for a 5 oz/in2setting would
weigh: 2.05 lbs/oz/in2x 5.0 oz./in2- 10.25 lbs
Valve Concepts allows a deviation from this
theoretical weight of ± 3.0%.
To Determine Diaphragm/Seat Leakage:
After both pallets’ weight has been determined and
verified for the required setting, reassemble the vent
and mount on a Tank Vent Test Stand and slowly
raise the pressure at the flow rate per API Standard
2000.
ACCEPTANCE CRITERIA:
The pressure gauge shall maintain a pressure equal
to or greater than 75% of set pressure for a one min-
ute period while the specified flow rate is maintained.
Note: Valve Concepts acceptance criteria meets or
exceeds the requirements of API. API 2521 states
that if the rate of leakage does not exceed ½ SCFH
for 6 inch size and smaller, 5 SCFH for 8 inch to 16
inch, or 20 SCFH for larger than 16 inch, at 75% of
set point, then a vent is considered satisfactory for
all practical purposes.
A test report should be completed for each vent. The
report should indicate the total pallet weight and the
pressure achieved at the Test Flow Rate for both
pressure and vacuum. Other general information
such as serial number, model number, material of
construction, set pressure and vacuum, etc. should
be included in the report.
The test report should be kept with the Valve Main-
tenance Records.
TABLE 2
Nominal Pallet Assembly Weight Per Unit of Pressure lbs (kg)
SET Point
Units
VALVE SIZE
2” VTA 2” PV 3” 4” 6” 8” 10” 12”
Lb (kg) Lb (kg) Lb (kg) Lb (kg) Lb (kg) Lb (kg) Lb (kg) Lb (kg)
1.0 oz/in20.25 (0.11) 0.55 (0.25) 0.93 (0.42) 2.05 (0.93) 3.50 (1.59) 5.45 (2.47) 7.71 (3.50) 9.17 (4.16)
1.0 in WC 0.15 (0.07) 0.32 (0.14) 0.54 (0.24) 1.18 (0.53) 2.03 (0.92) 3.15 (1.43) 4.46 (2.02) 5.30 (2.40)
1.0 mbar 0.13 (0.06) 0.13 (0.06) 0.22 (0.10) 0.48 (0.22) 0.81 (0.37) 1.26 (0.57) 1.79 (0.81) 2.13 (0.97)
Line Size 10 mil 20 mil 30 mil 40 mil
2” VTA 7.00 34.00 40.00 n/a
2” P/V 4.50 23.50 33.00 40.00
3” P/V 3.50 18.00 25.00 40.00
4” P/V 2.25 12.00 17.00 40.00
6” P/V 1.75 9.25 13.25 40.00
8” P/V 1.75 7.50 10.50 40.00
10” P/V 1.25 6.25 8.75 40.00
12” P/V 1.00 5.75 8.00 40.00
TABLE 3
Maximum Pressure Setting in oz/in2Vs. Diaphragm mil

6IOM-3400
SECTION VII
NEW REPLACEMENT UNIT:
Contact your local Cashco, Inc., Sales Representa-
tive with the Serial Number, Product code and the
pressure setting. With this information they can pro-
vide a quotation for a new unit including a complete
description, price and availability.
VII. ORDERING INFORMATION
NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR
To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stamped
on the metal name plate and attached to the unit. This information can also be found on the Bill of Material
(“BOM”), a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
PARTS "KIT" for FIELD REPAIR:
Contact your local Cashco, Inc., Sales Repre-
sentative with the Serial Number and Product
code. Identify the parts and the quantity required
to repair the unit from the “BOM” sheet that
was provided when unit was originally shipped.
NOTE: Those part numbers that have a quantity indi-
cated under "Spare Parts" in column "A” reflect
minimum parts required for inspection and re-
build, - "Soft Goods Kit". Those in column “B”
include minimum trim replacement parts needed
plus those "Soft Goods" parts from column "A".
If the "BOM" is not available, refer to the cross-
sectional drawings included in this manual for
part identification and selection.
A Local Sales Representative will provide
quotation for appropriate Kit Number, Price
and Availability.
CAUTION
Do not attempt to alter the original construction of any
unit without assistance and approval from the factory.
All proposed changes will require a new name plate
with appropriate ratings and new product code to
accommodate the recommended part(s) changes.

7
IOM-3400
MODEL 3400 PRESSURE RELIEF VENT
ITEM NO. METAL BODY PART LIST FRP BODY PART LIST
1 Body Body
3 Seat Ring Seat Ring
4 Pallet Pallet
5 Diaphragm Diaphragm
6 Diaph Retaining Plate - Pressure
7 Weather Hood Nut Weather Hood Nut
10 Pressure Pallet Stem Integral Part of Item 4
11 Seat ring Bolts Not Required
13 Seat Ring Gasket Not required
16 Weather Hood Support Weather Hood Support
17 Weather Hood Assembly Weather Hood Assembly
18 Weight Weight
19 Lock Washer Not Required
23 Pallet Nut/Bolt Pallet Nut/Bolt
24 Plain Washer Not Required
27 Outlet Screen Not Required
31 Pipe Plug Not Required
42 Stiffener Plate Not Required
61 Cotter Pin Not Required
69 Stud Spacer Not Required
72 Washer Not Required

8IOM-3400
ADDENDUM - A
TIGHTENING SEQUENCE FOR FLANGE BOLTING
GUIDELINES FOR BOLTED FLANGE JOINT ASSEMBLY ACCORDING TO ASME PCC-1 SPECS
STEP LOADING
Install Hand tighten. Check flange gap around circumference for uniformity. If the gap is not reasonably
uniform, make the appropriate adjustments by selective tightening before proceeding.
Round 1 Tighten to 20% to 30% of target torque. Check flange gap around circumference for uniformity. If
the gap is not reasonably uniform, make the appropriate adjustments by selective tightening before
proceeding.
Round 2 Tighten to 50% to 70% of target torque. Check flange gap around circumference for uniformity. If
the gap is not reasonably uniform, make the appropriate adjustments by selective tightening before
proceeding.
Round 3 Tighten to 100% of target torque. Check flange gap around circumference for uniformity. If the gap is
not reasonably uniform, make the appropriate adjustments by selective tightening.

9
IOM-3400
Gasket seating surfaces for tank nozzle flange must be clean, free of scratches,
corrosion, tool marks and flat. Use either a full faced or ring gasket for steel and
stainless steel raised face flanges.
FRP and Aluminum vents are furnished with flat faced flanges. It is recommended
that they be installed on mating flat face flanges with a full faced gasket. If the flat
face of the vent is sealing against a raised face steel flange, a spacer or filler ring
must be used to fill the annular space of the raised face steel flange.
Refer to Gasket Dimension Table.
Ensure that the gasket material is suitable for the service. Make sure that the
gasket is compressed evenly and the flanges are not distorted. Utilizing proper
torquing techniques will ensure a tight seal and prevent leakage around the
gasket. See preceding page.
NOTE: Incorrect positioning and/or selection of gasket(s) between the flanges
will cause bending stresses at the flange that may damage the flange joint
as bolting is tightened. This is more likely to occur with aluminum or cast iron
materials.
RECOMMENDATIONS FOR PROPER GASKET INSTALLATION
Correct Installation
Correct Installation
Incorrect Installation
Full Faced Gasket
Spacer and
Full Faced Gasket
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right
to modify or improve the designs or specifications of such product at any time without notice.
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any
Cashco, Inc. product remains solely with the purchaser.

10 IOM-3400
Cashco, Inc. declares that the products listed in the table below has been found to comply with the Essential Health and
Safety Requirements relating to the design and construction of products intended for use in potentially explosive atmospheres
given in Annex II of the ATEX Directive 2014/34/EU and given in Schedule 1 of The Equipment and Protective Systems
Indented for Use in Potentially Explosive Atmospheres Regulations 2016. Compliance with the Essential Health and Safety
Requirements has been assured by compliance with EN ISO 80079-36:2016 and EN ISO 80079-37:2016. The product will
be marked as follows:
II 2 G
Ex h IIB T6... T1 Gb
1000ATEXR1 X
The ‘X’ placed after the technical file number indicates that the product is subject to specific conditions of use as follows:
1. The maximum surface temperature depends entirely on the operating conditions and not the equipment itself. The
combination of the maximum ambient and the maximum process medium temperature shall be used to determine the
maximum surface temperature and corresponding temperature classification, considering the safety margins described
prescribed in EN ISO 80079-36:2016, Clause 8.2. Additionally, the system designer and users must take precautions to
prevent rapid system pressurization which may raise the surface temperature of system components and tubing due to
adiabatic compression of the system gas. Furthermore, the Joule-Thomson effect may cause process gases to rise in
temperature as they expand going through a regulator. This could raise the external surface temperature of the regulator
body and the downstream piping creating a potential source of ignition. Whether the Joule-Thomson effect leads to
heating or cooling of the process gas depends on the process gas and the inlet and outlet pressures. The system
designer is responsible for determining whether the process gas temperature may raise under any operating conditions.
2. Where the process medium is a liquid or semi-solid material with a surface resistance in excess of 1GΩ, special
precautions shall be taken to ensure the process does not generate electrostatic discharge.
3. Special consideration shall be made regarding the filtration of the process medium if there is a potential for the process
medium to contain solid particles. Where particles are present, the process flow shall be <1m/s (<3.3 ft/s) in order to
prevent friction between the process medium and internal surfaces.
4. Effective earthing (grounding) of the product shall be ensured during installation.
5. The valve body/housing shall be regularly cleaned to prevent build up of dust deposits.
6. Regulators must be ordered with the non-relieving option (instead of the self-relieving option) if the process gas they are
to be used with is hazardous (flammable, toxic, etc.). The self-relieving option vents process gas through the regulator
cap directly into the atmosphere while the non-relieving option does not. Using regulators with the self-relieving option
in a flammable gas system could create an explosive atmosphere in the vicinity of the regulator.
7. Tied diaphragm regulators with outlet ranges greater than 7 barg (100 psig) should be preset to minimize the risk that
improper operation might lead to an outboard leak and a potentially explosive atmosphere.
8. All equipment must only be fitted with manufacturer’s original spare parts.
9. Ensure that only non-sparking tools are used, as per EN 1127-1, Annex A.
ATEX DIRECTIVE 2014/34/EU and THE EQUIPMENT AND PROTECTIVE SYSTEMS INTENDED FOR USE IN
POTENTIALLY EXPLOSIVE ATMOSPHERES REGULATIONS 2016
IOM ADDENDUM:

11
IOM-3400
Cashco, Inc.
P.O. Box 6
Ellsworth, KS 67439-0006
PH [phone]
Fax. # [phone]
www.cashco.com
email: [email protected]
Printed in U.S.A. 3400-IOM
Cashco GmbH
Handwerkerstrasse 15
15366 Hoppegarten, Germany
PH [phone]
Fax. No. [phone]
www.cashco.com
email: [email protected]
Cashco do Brasil, Ltda.
Rua Bonifácio Cubas, 389.
Cep 02731-000 – Vila Albertina - São Paulo - SP
PH [phone]
Fax. No.
www.cashco.com
email: [email protected]
REGULATORS
PRODUCT
31-B, 31-N
1164, 1164(OPT-45)
1171, 1171(OPT-45), 1171(CRYO)
2171, 2171(OPT-45), 2171(CRYO), 3171
1465, 3381, 3381(OPT-45), 3381(OPT-40)
4381, 4381(OPT-37), 4381(CRYO), 4381(OPT-45), 5381
MPRV-H, MPRV-L
PBE, PBE-L, PBE-H
CA-1, CA-2
CA1, SA1, CA4, SA4, CA5, SA5
DA2, DA4, DA5, DA6, DA8
DA0, DA1, DAP, SAP
SLR-1, SLR-2, PTR-1
ALR-1, ULR-1, PGR-1
BQ, BQ(OPT-45), BQ(CRYO)
123, 123(CRYO), 123(OPT-45), 123(OPT-46G)
123-1+6, 123-1+6(OPT-45), 123-1+6(OPT-46G), 123-1+6+S, 123-1+6+S(OPT-40)
1000HP, 1000HP(OPT-37), 1000HP(OPT-45), 1000HP(OPT-45G), 1000HP(CRYO)
1000HP-1+6, 1000HP-1+8, 1000LP, 1000LP(OPT-45), 1000LP(OPT-46G)
6987
8310HP, 8310HP-1+6, 8310HP-1+8, 8310LP, 8311HP, 8311LP
345, 345(OPT-45)
BA1/BL1, PA1/PL1
C-BPV, C-PRV, C-CS
D, D(CRYO), D(OPT-37), D(OPT-20), D(OPT-45)
DL, DL(LCC), DL(OPT-45)
BR, BR(CRYO)
HP, HP(LCC), HP(OPT-45), HP(OPT46G), HP-1+6+S(OPT-40), HP-1+6+S
P1, P2, P3, P4, P5, P7
B2, B7
POSR-1, POSR-2
5200P, 5300P
135
NW-PL, NW-SO
CG-PILOT
FG1
CONTROL
VALVES
RANGER, 987, PREMIER
964, 521, 988, 988-MB, 989
2296/2296HF
SCV-30, SCV-S
TANK
BLANKETING
8700, 8910, 8920, 8930, 8940
2100, 2199
3100, 3200, 3300, 3400, 3500, 3600, 3700
1078, 1088, 1100, 1049
5100, 5200, 5400 ,5500
4100, 4200, 4300, 4400, 4500, 4600
MISC 764P/PD, 764-37, 764T