Corken B166 Instruction manual

Installation, Operation
& Maintenance Manual
Models B166 and T166 External Automatic
Bypass Valves
Model B166 External
Automatic Bypass Valve
Model T166 External
Automatic Bypass Valve
Solutions beyond products...
Warning: (1) Periodic inspection and maintenance of Corken products is essential. (2) Inspection, maintenance and installation of Corken products
must be made only by experienced, trained and qualied personnel. (3) Maintenance, use and installation of Corken products must comply with
Corken instructions, applicable laws and safety standards (such as NFPA Pamphlet 58 for LP-Gas and ANSI K61.1-1972 for Anhydrous Ammonia).
(4) Transfer of toxic, dangerous, ammable or explosive substances using Corken products is at user’s risk and equipment should be operated
only by qualied personnel according to applicable laws and safety standards.
ORIGINAL INSTRUCTIONS IH100G

Warning
Install, use and maintain this equipment according to Corken’s instructions and all applicable federal, state, local laws
and codes. Periodic inspection and maintenance is essential.
Corken One Year Warranty
CORKEN, INC. warrants that its products will be free from defects in material and workmanship for a period of one
year from date of installation, provided that the warranty shall not extend beyond twenty-four (24) months from the date
of shipment from CORKEN. If a warranty dispute occurs, the DISTRIBUTOR may be required to provide CORKEN
with proof of date of sale. The minimum requirement would be a copy of the DISTRIBUTOR’S invoice to the customer.
CORKEN products which fail within the warrant period due to defects in material or workmanship will be repaired or
replaced at CORKEN’s option, when returned, freight prepaid to CORKEN, INC., 3805 N.W. 36th St., Oklahoma City,
Okla homa 73112.
Parts subject to wear or abuse, such as mechanical seals, blades, piston rings, valves and packing, and other parts
showing signs of abuse, neglect or failure to be properly maintained are not covered by this limited warranty. Also,
equipment, parts and accessories not manufactured by CORKEN but furnished with CORKEN products are not
covered by this limited warranty and the purchaser must look to the original manufacturer’s warranty, if any. This limited
warranty is void if the CORKEN product has been altered or repaired without the consent of CORKEN.
All implied warranties, including any implied warranty of merchantability or fitness for a particular purpose, are
expressly negated to the extent permitted by law and shall in no event extend beyond the expressed warrantee period.
CORKEN DISCLAIMS ANY LIABILITY FOR CONSEQUENTIAL DAMAGES DUE TO BREACH OF ANY WRITTEN OR
IMPLIED WARRANTY ON CORKEN PRODUCTS. Transfer of toxic, dangerous, flammable or explosive substances
using CORKEN products is at the user’s risk. Experienced, trained personnel in compliance with governmental and
industrial safety standards should handle such substances.
Important notes relating to the European Union (EU) Machinery Directive
Pumps delivered without electric motors are not considered as machines in the EU Machinery Directive. These pumps
will be delivered with a Declaration of Incorporation. The fabricator of the machinery must assure and declare full
compliance with this Directive before the machine in which the pump will be incorporated, or of which it is a part, is
put into service.
Contacting the Factory
Before you contact the factory, note the model number and serial number of your pump. The serial number directs
us to a file containing all information on material specifications and test data applying to your specific pump. When
ordering parts, the Corken service manual or Operations, Installation and Maintenance (IOM) manual should be
consulted for the proper part numbers. ALWAYS INCLUDE THE MODEL NUMBER AND SERIAL NUMBER WHEN
ORDERING PARTS.
The model and serial numbers are shown on the nameplate of the unit. Record this information for future reference.
Model No.
Serial No.
Date Purchased
Date Installed
Purchased From
Installed By
2

Table of Contents
APPLICABLE NOTICES FOR ATEX 2014/34/EU CONFORMITY........................................4
FEATURES OF THE B166 EXTERNAL AUTOMATIC BYPASS VALVE ...................................5
CHAPTER 1—INSTALLATION OF THE B166 EXTERNAL AUTOMATIC BYPASS VALVE ...................5
1.1 Operation of the B166 External Automatic Bypass Valve............................................5
FEATURES OF THE T166 AUTOMATIC EXTERNAL BYPASS VALVE ...................................7
CHAPTER 2—INSTALLATION OF THE T166 AUTOMATIC EXTERNAL BYPASS VALVE ...................7
2.1 Operation of the T166 Automatic External Bypass Valve............................................7
APPENDICES
A. Model Number Identification Code and Available Options ...........................................9
B. Specifications ............................................................................10
C. Performance .............................................................................10
D. Outline Dimensions ........................................................................11
E. Parts Details .............................................................................13
3

Applicable Notices for ATEX
2014/34/EU Conformity
Product Type:
Corken Liquid Transfer Bypass Valves
Model Covered:
T16 6 O N LY
Intended Application:
The bypass valve models covered by this manual conform to
the European Union ATEX 2014/34/EU Directive for explosive
gas atmospheres and transfer of liquefied gases such as
Liquefied Petroleum Gas, anhydrous ammonia, freons, etc.
Possible Misuse Warning:
The designated bypass valve models must only be
installed in systems designed for its intended use, similar
to the examples presented in this manual.
ATEX Classification:
Group II; Category 2; G; Temperature Class T4 – T5
These products are classified under the ATEX directive
as Equipment – Group II – Category 2 – equipment is
intended for use in areas where explosive atmospheres
caused by gases or vapors (G) may be present. The
surface Temperature Class rating is a range between T4
275°F (135°C) and T5 212°F (100°C).
Nameplate:
Training Instructions:
Instructions for the safe application and use of this product
are provided in this manual. Read this manual completely
prior to installation and use of this product. Only qualified
and properly trained personnel should be allowed to install,
operate, and maintain this equipment.
Mechanical Ignition Sources:
The bypass valve is installed as part of an assembly including
the pump and the entire system must be grounded to prevent
possible electrostatic discharge. Installation and adjustment
guidelines are provided in this manual and are to be followed
for the proper operation and performance of the valve.
Sound Levels:
These products are reactionary devices used in pumping
systems. Sound levels are highly dependent upon the
application, product being pumped, and installation. When
operating in the system the valves should have a noise
level no higher than 80 dBA.
Piping Forces and Moments:
Maximum Allowable Nozzle Forces and Moments
Note: Piping systems should be designed according to
standard engineering practice and applicable national
and local codes. NO piping induced forces or moments
are recommended for Corken T166 bypass valves.
X—Horizontal (perpendicular to valve discharge port)
Y—Vertical
Z—Horizontal (parallel to valve discharge port)
Fx = Fy = Fz = 42 lb (19 kg)
Mx = My = Mz = 70 ft•lb (10 kg•m)
Notice!
Corken bypass valves should only be installed in LPG
& NH3systems that have been designed by qualified
engineering personnel and operated and maintained
by qualified technicians. The system must conform to
all applicable local and national regulations and safety
standards (specifically, LPG systems must conform to
NFPA 58). This manual must be kept with the bypass
valves and be reviewed before installing, operating or
performing any maintenance work.
Warning!
Do not attempt to open the pump or bypass valve until you
have bled off the pressure. High pressure in the system
can cause personal injury and/or property damage.
Please note: if the system contains a meter, the differential
valve will keep liquid under pressure in the pump, meter
and piping even after the hose has been emptied.
File number ATEX and
machinery
directive
Explosion
protection
ATEX Directive
2014/34/EU marking
Equipment classified
as Group II—Catagory 2
Explosion gas
atmosphere high level
Surface temperature
range T4
(135°C) 275°F
4

Features of the B166 External
Automatic Bypass Valve
The CORKEN B166 external bypass valve is a patented,
dual purpose, automatic priming and differential valve
designed for high-pressure volatile liquid service. This valve
may be used with stable liquids as well.
The B166 external bypass valve was also designed to work
in conjunction with CORKEN’s Coro-Flo®regenerative
turbine pumps but may be used with centrifugal pumps and
others as well.
To ensure optimum performance of the external bypass
valve and the entire pumping system, follow the instructions
in this manual.
Chapter 1—Installation of the B166
External Automatic Bypass Valve
Proper installation of the CORKEN B166 external bypass
valve ensures optimum performance of the pump and
external bypass valve. Install the B166 external bypass
valve on the discharge side of the pump in either a vertical
or horizontal position. All CORKEN Coro-Flo®turbine
pumps have a 3/4" NPT opening in the discharge nozzle for
piping this valve. When using other pump designs without a
3/4" NPT opening, a tee must be installed in the discharge
line. The discharge piping of the bypass valve should
connect to the vapor section of the supply tank using an
excess flow valve and not a back check valve. Do not
connect the outlet piping of the external bypass valve
to the inlet piping of the pump. A typical installation
is shown in Figure 1.1. The recommended pipe sizes for
discharge lines are given in the table below. For distances
of 50 feet or more, the next larger pipe size should be used.
Pipe Sizes for Discharge Line
Flow Rate Pipe Size by Model Number
B166B-.75 B166B -.1
Up to 30 GPM 3/4" —
Up to 40 GPM —1"
1.1 Operation of the B166 External
Automatic Bypass Valve
Stationary Applications:
The differential pressure setting of the B166 external
bypass valve is adjustable. The range of differential
pressure depends on the size of the spring installed in
the bypass valve. When the bypass valve ships from
the CORKEN factory, a tag identifying the spring size
is attached to the valve bonnet. The table below shows
the part number and differential pressure range for each
spring. All of the springs are interchangeable with each
valve size.
Valve Model Spring Number Differential Pressure
(PSIG)
B166
113 8 25–60
1193 50–150
1193 100–225
1313
After the external bypass valve has been installed, it must
be set properly.
1. Install liquid-filled pressure gauges equipped with a
needle valve or snubber in the following locations:
a. Pump discharge gauge port or inlet side of the
bypass valve.
b. Supply tank and/or pump suction.
2. Attach an ammeter to a motor lead of the electric motor.
Figure 1.1: Typical installation. Figure 1.2: B166 with priming function.
Delivery line
shut-off or
pressure build
up is so high
that valve
opens and
relieves
capacity back
into supply
tank.
Liquid from
supply tank
seeking its
level in pump
and bypass
piping.
No circulation
- all pump
capacity
going to
delivery.
INLET
LIQUID VAPOR VAPOR and/or LIQUID
INLET INLET
OUTLETOUTLETOUTLET
FIG. 1 Relieving Operation
OPEN
FIG. 2 Pumping Operation
CLOSED
FIG. 3 Priming Operation
OPEN
Discharge line
5

3. Loosen the locknut on the B166 external bypass valve
and decrease the pressure to the lowest setting by
turning the adjusting screw counterclockwise until
spring tension is no longer present.
4. Make sure the shut-off valves on pump discharge line
and bypass return line are in a fully open position.
5. Record the pressure indicated on the gauge mounted
to the 1/4" NPT discharge opening of the pump.
6. Fully open the outlet valve of the supply tank. Start
pumping at a normal delivery rate and circulate the
liquid back to the supply tank using the discharge line.
7. Slowly close the shut-off valve located on pump
discharge line so all of the liquid flows through the
B166 external bypass valve. Record the pressure
indicated on the gauge mounted to the 1/4" NPT
discharge opening of the pump.
8. Slowly increase the pressure setting of the B166
bypass valve by turning the adjusting screw clockwise
and watch the pressure gauge. When the pressure
stops increasing or just before it drops back to
the starting pressure, record the highest pressure
indicated on the gauge mounted to the 1/4" NPT
discharge opening of the pump and turn off the pump.
9. Decrease the pressure setting of the B166 external
bypass valve again by turning the adjusting screw
counterclockwise two to three turns.
10.Re-start the pump and increase the pressure setting
of the B166 external bypass valve by turning the
adjusting screw clockwise. The final pressure setting
should be 5–10 psi (0.3–0.69 bar) under the pressure
indicated in step 8 listed above; however, depending
on your pump model, the final pressure should not
exceed 100–125 psi (6.9–8.6 bar) higher than the
starting pressure.
EXAMPLE: The starting pressure is 125 psi (8.6
bar). After starting the pump it increases to 150 psi
(10.3 bar) and adjusts to a maximum pressure of 235
psi (16.2 bar) before dropping back to the starting
pressure of 125 psi (8.6 bar). Since the final pressure
setting should be 5–10 psi (0.3–0.69 bar) below the
maximum pressure of 235 psi (16.2 bar), the bypass
should be set at 225–230 psi (15.5–15.9 bar) and
locked in position using the locknut.
NOTE: This may be higher than the full load amperage
(FLA) or service factor amperage (SFA) of the motor.
If the pump operates in a continuous duty application,
the final pressure setting of the external bypass should
be set just below the FLA or SFA.
11. Once a satisfactory pressure adjustment has been
achieved, attach the “tamper-proof” seal furnished
with the B166 external bypass valve to prevent
unauthorized adjustments.
12.Open the shut-off valve located on the pump discharge
line downstream of the B166 external bypass valve
and continue pumping as needed.
WARNING: Do not adjust the external bypass
valve beyond the range of the spring being used.
NOTE: On Anhydrous Ammonia and LP-Gas
installations, follow the guidelines provided
by Underwriter’s Laboratories, Inc. and NFPA
Pamphlet # 58.
Notice!
1. If the automatic external bypass valve is sized and set
correctly, the manual or hand operated bypass valve–
if applicable–should remain in the closed position
during normal operation. Keeping the manual or hand
operated bypass valve closed ensures the automatic
external bypass valve functions in normal operations.
2. Annual inspection and testing of the pump’s internal
relief valve–if applicable–and the automatic external
bypass valve are recommended. For testing
procedures refer to the adjustment procedures listed
in this manual.
6

Figure 2.1: Typical installation.
Features of the T166 Automatic
External Bypass Valve
The CORKEN T166 external bypass valve is designed
for use with truck pumps. It controls the pump
discharge pressure and bypasses excess liquid back
to the truck tank.
This bypass valve can also be used in stationary
applications utilizing sliding vane pumps.
Chapter 2—Installation of the T166
Automatic External Bypass Valve
Proper installation ensures optimum performance of the
pump and external bypass valve. Install the T166 external
bypass valve on the discharge side of the pump in either
a vertical or horizontal position. The discharge piping of
the bypass valve typically connects to the vapor section
of the truck tank using a back check valve. A typical truck
installation is shown in Figure 2.1. The recommended
pipe size for the discharge line is given in the table below.
For distances of 50 feet or more, the next larger pipe size
should be used.
Stationary applications with internal relief valves:
When the T166 external bypass valve is used for vapor
venting, the piping should be the same size used with the
B166 external bypass valve.
To ensure optimum performance of the external bypass
valve and the entire pumping system, follow the instructions
in this manual.
Pipe Size for the Discharge Line
Flow Rate Pipe Size by Model Number
T166 -1.25 T166-1.5
Up to 80 GPM 1-1/4" —
Up to 100 GPM —1-1/2"
2.1 Operation of the T166
Automatic External Bypass Valve
Truck Applications:
The differential pressure setting of the B166 external bypass
valve is adjustable. The range of differential pressure
depends on the size of the spring installed in the bypass
valve. When the bypass valve ships from the CORKEN
factory, a tag identifying the spring size is attached to the
valve bonnet. The table below shows the part number
and differential pressure range for each spring. All of the
springs are interchangeable with each valve size.
Valve Model Spring Number Differential Pressure
(PSIG)
T166
113 8 25–60
1193 50–150
1193 100–225
1313
1. Install liquid-filled pressure gauges equipped with a
needle valve or snubber in the following locations:
a. Pump discharge gauge port or Inlet side of the
bypass valve.
b. Supply tank and/or pump suction.
Bypass Valve
Pump
7

2. Connect the delivery hose to the receiving/storage
tank or delivery tank port for recirculation.
3. All shut-off valves on the pump discharge line and
bypass return line should be in a fully open position.
4. Fully open the outlet valve of the supply tank and start
pumping at a normal delivery rate. Make sure the
direction of the rotating shaft follows the directional
arrow located on the pump casing.
5. If the pump has an internal relief valve, check the
pressure setting by slowly closing the shut-off valve in
the bypass return line.
6. Slowly close the shut-off valve located on the
pump’s discharge line while observing the pressure
gauge on the pump’s discharge port. As the internal
relief valve begins to open, the differential pressure
typically drops. It is important to record the peak
differential pressure (the difference between inlet
and outlet pressure) before the internal relief valve
opens. After circulation starts to flow through
the internal relief valve, the pressure will drop
significantly due to vaporization.
NOTE: The internal relief valve on the Z-Series
truck pumps is pre-set at the factory and not
adjustable in the field.
7. After the setting of the internal relief valve is confirmed,
open the shut-off valves located on the pump discharge
line and the bypass return line and resume normal
operation of the pump.
8. To confirm the setting for the T166 external bypass
valve, slowly close the shut-off valve in the pump’s
discharge line and record the pressure shown on the
gauge. The difference between the pump’s discharge
pressure and the tank pressure (before pumping) is
the setting of the external bypass valve.
9. If the pump is equipped with an internal relief valve,
the T166 external bypass valve should be set 20–25
psi (1.38 to 1.72 bar) below the setting of the pump’s
internal relief valve. Following this guideline ensures
the liquid does not recirculate through the internal
relief valve and eliminates the possibility of erratic
“hunting” between the two valves.
10.Reopen the shut-off valve in the pump’s discharge line
and resume normal operation of the pump. Record the
pressure shown on the gauge. The difference between
the pump’s discharge pressure and the tank pressure
(before pumping) is the normal operating pressure of
the system.
11. If possible, the setting of the T166 external bypass
valve should be 15 psi (1.03 bar) higher than the normal
operating pressure of the piping system. An operating
pressure near the external bypass valve setting may
cause the liquid to recirculate unnecessarily.
12.Adjust the pressure setting of the T166 external
bypass valve if necessary. The external bypass valve
can be adjusted by loosening the locknut and turning
the adjusting screw.
a. To increase the pressure setting, loosen the locknut
and turn the adjusting screw clockwise.
b. To decrease the pressure setting, loosen the locknut
and turn the adjusting screw counterclockwise.
13.Once a satisfactory pressure adjustment has
been achieved, attach the “tamper-proof” seal
furnished with the external bypass valve to prevent
unauthorized adjustments.
Notice!
1. If the external automatic bypass valve is sized and set
correctly, a manual or hand operated bypass valve–
if applicable–should remain in the closed position
during normal operation. Keeping the manual or hand
operated bypass valve closed ensures the external
automatic bypass valve operates in a normal capacity.
2. Annual inspection and testing of the internal relief
valve–if applicable–and the external automatic bypass
valve are recommended. For testing procedures refer
to the adjustment procedures listed in this manual.
8

1
Registered trademark of the DuPont company.
Base Model B166B-.75 B166B-1 T166-1.25 T166-1.5
Inlet 3/4" NPT 1" NPT 1-1/4" ANSI 1-1/2" ANSI
Outlet 3/4" NPT 1" NPT 1-1/4" ANSI 1-1/2" ANSI
Maximum flow rate (gpm) 30 40 80 100
Ship weight
lb (kg) 9 (4.1) 9 (4.1) 9 (4.1) 9 (4.1)
Springs
25–60 psig differential range No charge option A
50–150 psig differential range No charge option B
100–225 psig differential range No charge option C
O-ring
Material
Buna-N Standard A
Neoprene®1 No charge option B
Viton®1 No charge option D
Ethylene propylene No charge option G
Kalrez®1 No charge option K
Flanges Threaded body, no flanges Standard U
Appendix A—B166 and T166 Model Number and Identification Code
Appendices
A. Model Number Identification Code and Available Options
9
Model Number
Base X X X

Appendix B—Specifications
Specification B166 T166
Inlet 3/4", 1" 1-1/4", 1-1/2"
Outlet 3/4", 1" 1-1/4", 1-1/2"
Differential pressure range
psi (bar) 25–225 (1.7–15.5) 25–225 (1.7–15.5)
B166 Patented vapor recovery system keeps the pump primed at all times and minimizes wear.
T166 Opens gradually as the pressure builds up to modulate the flow. Continuous internal bleed assists in
eliminating vapors.
B166 Combination bypass and priming valve
Flows up to 40 gpm (9.1 m3/hr)
T166 High pressure build-up valve
Flows are 30 to 100 gpm (6.8 to 22.7 m3/hr)
B166 Used with small cylinder filling pumps and
aerosol propellant feed pumps.
T166 Used with truck pumps and multi cylinder
filling pumps.
Part Model Standard Material Optional Material
Valve body B166, T166 Ductile iron: ASTM 536, 60-40-18
Valve bonnet B166, T166 Ductile iron: ASTM 536, 60-40-18
O-rings B166, T166 Buna-N
Neoprene®1, Viton®1,
Ethylene propylene,
Kalrez®1
Spring B166, T166 Music wire/chrome silicon
Adjusting screw gasket B166, T166 1010 hot rolled steel
Spring guide B166, T166 8620 A322 ASTM steel
Relief Valve B166, T166 17-4 PH stainless steel
1
Registered trademark of the DuPont company.
Material Specifications
Operating Specifications
Features & Benefits
Equipment Type Applications
B. Specifications
C. Performance
Appendix C—Models B166 and T166 Performance Curves
B166 Performance Curve T166 Performance Curve
�
�
10

Appendix D—Outline Dimensions for Model B166
All dimensions are in inches (centimeters).
D. Outline Dimensions
1.438
(3.7)
1.750
(4.4)
1.375
(3.5)
1.375
(3.5)
2.105
(5.3)
7.9 2 6
(20.1)
3/4" NPT
3/4" NPT
11

Appendix D—Outline Dimensions for Model T166
All dimensions are in inches (centimeters).
8-3/32
(20.52)
1-5/16
(3.33)
2-7/16
(6.19)
1-5/16
(3.33)
1-5/16
(3.33)
1-5/16
(3.33)
Pipe tap options
T166-1.25: 1-1/4"NPT
T166-1.5: 1-1/2"NPT
12

Appendix E—Parts Details for Models B166B-.75 and B166B-1
O-ring Code
ABuna-N
BNeoprene®a
DViton®a
GEthylene
propylene
KKalrez®a
E. Parts Details
17
13
12
11
10
89
14
15
16
5
6
7
4
Bolt torque
25 ft•lbs
3
2
1
Ref.
No. Part No. Description Qty
1. 2911 Adjusting screw 1
2. 7101-037NC01A Hex nut 1
3. 2732 Center head bolt gasket 1
4. 7002-037NC087A Socket head bolt 4
5. 1134 Bonnet 1
6. 1136 Spring seal 1
7. 2-217bO-ring 1
8. 1138 Relief spring (25–60 psi) 1
1193 Relief spring (50–150 psi) 1
9. 1193 Relief springs (100–225 psi) 1
1313 1
10. 1251 Valve 1
Ref.
No. Part No. Description Qty
11. 1139 Ball spring (standard) 1
2035cBall spring (heavy duty)
12. 1137 Ball 1
13. 2-224bO-ring 1
14. 3442 Pipe plug 1
15. 7012-006SF025C Pan HD phillip 6-32 x 1/4"-
Type F SS 2
16. 2030 Nameplate 1
17. 1200 3/4" Body (B166B-.75) 1
1200-1 1" Body (B166B-1) 1
a
Registered trademark of the DuPont company.
b
_ denotes O-ring code. See chart above.
c
Used with relief springs 1193 and 1313 (100–225 psi).
13

a
Registered trademark of the DuPont company.
b
_ denotes O-ring code. See chart above.
Appendix E—Parts Details for Models T166-1.25 and T166-1.5"
Ref.
No. Part No. Description Qty
1. 2911 Adjusting screw 1
2. 7101-037NC01A Head head nut—3/8-16 1
3. 2732 Center headbolt gasket — Steel 1
4. 1134 Bonnet 1
5. 7002-037NC087A Socket head—3/8-16 X 7/8",
gr 8 4
6. 1136 Spring seal 1
7. 2-217_bO-ring 1
8. 1138 Spring (25 to 60 psi) 1
1193 Spring (50 to 150 psi) 1
9. 1193 Spring (100 to 225 psi) 1
1313 1
Ref.
No. Part No. Description Qty
10. 2215 Valve 1
11. 2-224_bO-ring 1
12. 1320-2 Body—T166–1-1/4" 1
1320-3 Body—T166–1-1/2" 1
13. 7012-006SF019E Pan head Phillip - 6-32
X3/16"-TYP 2
14. 2216 Nameplate 1
15. 3442 Pipe plug–1/4 NPT 1
1
2
3
4
13
14
15
6
7
5
8
9
10
11
12
O-ring Code
ABuna-N
BNeoprene®a
DViton®a
GEthylene
propylene
KKalrez®a
14

15

Printed in the U.S.A.
September 2016
CORKEN, INC. • A Unit of IDEX Corporation
3805 N.W. 36th St., Oklahoma City, OK 73112
Phone [phone] • Fax [phone]
Visit our website at http://www.corken.com
or e-mail us at [e-mail]
Solutions beyond products...
@CorkenInc