Siemens Milltronics C-40 Manuale utente

Instruction Manual October 2003

C-40

milltronics

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Safety Guidelines

Warning notices must be observed to ensure personal safety as well as that of others, and to

protect the product and the connected equipment. These warning notices are accompanied

by a clarification of the level of caution to be observed.

Qualified Personnel

This device/system may only be set up and operated in conjunction with this manual.

Qualified personnel are only authorized to install and operate this equipment in accordance

with established safety practices and standards.

Warning: This product can only function properly and safely if it is correctly transported,

stored, installed, set up, operated, and maintained.

Note: Always use product in accordance with specifications.

Instruments Inc.2003.AllRights ReservedDisclaimer of Liability

This document is available in bound version and in

electronic version. We encourage users to

purchase authorized bound manuals, or to view

electronic versions as designed and authored by

Siemens Milltronics Process Instruments Inc.

Siemens Milltronics Process Instruments Inc. will

not be responsible for the contents of partial or

whole reproductions of either bound or electronic

versions.

While we have verified the contents of

this manual for agreement with the

instrumentation described, variations

remain possible. Thus we cannot

guarantee full agreement. The

contents of this manual are regularly

reviewed and corrections are included

in subsequent editions. We welcome

all suggestions for improvement.

Technical data subject to change.

MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments Inc.

Contact SMPI Technical Publications at the following address:

Technical Publications

Siemens Milltronics Process Instruments Inc.

1954 Technology Drive, P.O. Box 4225

Peterborough, Ontario, Canada, K9J 7B1

Email: techpubs@siemens-milltronics.com

For the libraryof SMPI instruction manuals, visitour Web site: www.siemens-milltronics.com

7ML19985DQ61 Milltronics C-40 – INSTRUCTION MANUAL EN-1

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Milltronics C-40 Solids Flowmeter

Milltronics C-40 solids flowmeter is a low- to medium-capacity flowmeter designed to

NFPA Code 8503 requirements for pulverized coal and coke. It is designed specifically for

applications where the possibility of material combustion or explosion exists. The C-40

flowmeter is equipped with an ILE-37 sensing head and is suitable for material flowrates

up to 40 t/h. The standard sensing head fiberglass cover is replaced by a hinged steel

cover.

The C-40 solids flowmeter is capable of containing an explosion generating an internal

pressure of 50 psi. Upset conditions generating up to 10 psi can be tolerated when a PTFE

inner gasket is used. In normal operation, the internal pressure must be less than 1 psig.

The flowmeter sensing head LVDT output signal is processed by the flowmeter integrator

(ordered separately) to:

• monitor material flow

• maintain accurate material inventory

The following components are included with each Milltronics C-40 flowmeter:

• C-40 flowmeter housing and flowguide

• ILE-37 sensing head (factory mounted)

• spare damping fluid and filler bottle

To complete the Milltronics C-40 flowmeter system, the following parts must be ordered

separately:

• stainless steel sensing plate

• electronic flowmeter integrator

• LVDT Conditioner Card in NEMA 4 enclosure

• calibration weights

material infeed

material

discharge

impact force

sensing plate

flowguide

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Specifications

Product

• fine powder to 12 mm (1/2”)

Product Temperature

• -40 to 65 °C (-40 to 150 °F)

Ambient Temperature

• -40 to 65 °C (-40 to 150 °F)

Accuracy

• ± 1% of full scale

Repeatability

•±0.2%

Operating Range

• 0 to 0.5 t/h (0.6 STPH) min.

• 0 to 40 t/h (44 STPH) max (to suit application)

Construction

• painted mild steel flowguide and housing

• sensing plate (to suit application)

• ILE-37 sensing head

Classification

• NFPA code 8503

Approvals

• ILE-37: CSA Class I, Groups C and D, Class II Groups E, F, and G

Options

• Alumina Ceramic abrasion resistant sensing plate lining

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Installation

Install the Milltronics C-40 flowmeter in an area that is suitable for the system

classification rating. Maintain sufficient clearance to permit:

• sensing plate installation and removal

• opening the sensing head cover for calibration purposes

Ensure the flowmeter inlet and outlet mounting surface are free from vibration.

Installation Procedure

1. Position the flowmeter into the desired location.

2. If necessary, shim the mounting brackets to establish level in both planes.

3. Fasten the housing discharge to the downstream material chute.

4. Fasten the flowguide to the material infeed chute.

5. Refer to the ILE-37 sensing head instruction manual for levelling, sensing plate

installation, and interconnection instructions.

Note: Ensure sufficient mechanical support is provided for the flowmeter and

chutework for all operating conditions.

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Applications

The operational performance and maintenance requirements of a flowmeter application

are directly related to the care and consideration given to material flow patterns.

Material Feed

The following material in-feed characteristics are considered ideal:

• material velocity is constant and relatively low

• material flowrate is uniform (not pulsing)

• air flow through the flowmeter is negligible

• flowguide is always 1/6 to 1/2 full during operation

In cases where material cannot be gravity fed from an elevated bin to the flowmeter,

choose a mechanical feeding device that provides the most consistent material flow.

Most coal scale applications require an airlock on the flowmeter infeed and discharge; in

such cases, rotary airlock feeders can provide the airlock. Install a screw conveyor just

before the flowguide to modulate the heavily pulsing discharge of the infeed rotary

feeder. For best results, overfeed the screw conveyor, maintaining a constant plugged

screw condition.

For high or variable velocity feeder material discharges, employ a

reverse flowguide

transition

s. (Refer to

Feeder / Flowguide Transition,

page 5.)

For slight to moderate material pulsing at a frequency greater than one pulse per second,

use a heavier flowmeter sensing head range spring and/or viscous damper fluid as

compensation.

For heavily pulsing feeder discharges, at a frequency less than one pulse per second,

consult your local Siemens Milltronics representative,

or visit www.siemens-milltronics.com.

rotary airlock feeder

pneumatic supply

rotary airlock feeder

C-40 coal scale

screw conveyor

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Screw Conveyor

Rotary Airlock Feeder

Feeder/Flowguide Transition

Short pitch and/or double flight screws are

preferred, reducing the batch size (and increasing

the frequency) of the material discharge pulses.

Alternatively, the flights of a standard screw may

be cut back, ending before the discharge opening.

Consider a reverse flowguide transition for

operating speeds above 40 rpm.

Rotary airlock feeders provide an air seal between

the upstream and/or downstream process and the

flowmeter. This may be required if:

• the material is pneumatically conveyed

• flowmeter/process isolation is required

Best results are obtained from rotary feeders with

more vanes, operating at higher speeds.

Consider a reverse flowguide transition for

operating speeds above 10 rpm.

reverse flowguide transition

reverses the

direction of the bin or feeder material discharge

before the material enters the flowmeter

flowguide. Reversing direction forces the material

into a desirable flow pattern instead of permitting

material to be flung from the feeder directly into

the flowguide. This transition is especially

important for high or variable speed feeders.

forward flowguide transition

keeps the material

flowing in the same direction between the bin or

feeder discharge and the flowguide. This transition

is acceptable for a low and constant velocity

feeder. If a forward flow guide transition must be

used for a high or variable speed feeder

application, install a baffle plate.

short pitch

double flight

baffle

plate

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Dogleg

Short/Long Fall Chutes

A dogleg may be used to reduce material velocity

and the detrimental effect of variable material

velocity. The dogleg is especially important when a

long fall chute must be used. If the material is

abrasive, the chute should be lined with an

abrasion-resistant material.

A material in-feed chute where the bin or feeder

discharge to flowmeter flowguide fall is less than

0.6 m (2 ft) is referred to as a

short fall chute.

This

chute is ideal because material velocity caused by

gravity is minimal. The chute centerline and angle

should coincide with that of the flowguide for a

distance greater than or equal to the flowguide

diameter (before the flowguide inlet).

long fall chute

describes a material in-feed

where the bin or feeder discharge/flowguide fall is

more than 0.6 m (2 ft). The long fall chute is less

desirable than the short fall chute, as material

velocity is increased. Increased material velocity

increases flowmeter component abrasion. Greater

distances after chute angle changes (to settle

material into desirable flow patterns) are also

required.

< 0.6 m (2 ft.)

> 0.6 m (2 ft.)

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In-Feed/Discharge Air Pressure

Maintenance

Upset conditions with high pressure generation may cause the sensing head’s internal

components to be contaminated by powder. In this case, the inner gasket may leak or

rupture. It may therefore be necessary to replace the inner gasket, clean out the sensing

head area, and replace the damping fluid. Refer to the instruction manual 7ML19985CW01

for ILE-37 side mount sensing head information.

All Siemens Milltronics manuals are available for free download at www.siemens-

milltronics.com.

If a material in-feed/discharge differential air

pressure is anticipated and rotary airlock feeders

are not used, the in-feed and discharge chutes

should be vented to a common dust collector. A

tuning gate may be installed in each chute to

balance the air pressure. If a dust collector is not

used, an air bypass chute may be installed

between the flowmeter in-feed and discharge

chutes.

to common dust collector

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Dimensions

Installation Notes

• Built to withstand 50 psi internal pressure (NFPA code 8503).

• Ensure sufficient mechanical support is provided for the flowmeter and chutework

for all operating conditions.

• The discharge centerline must be plumb. Shim if necessary.

C-40 Dimensions

Size Max Flowrate

at bulk density

AB(number

of holes)

CDEFG H J

250 mm

(10”)

40 t/h at

0.4 t/m3(25 pcf)

362mm

(14.25”)

12 25 mm

(1”)

225mm

(10.02”)

406mm

(16”)

15° 1250mm

(49.21”)

225mm

(8.86”)

1257mm

(49.50”)

150 mm

(6”)

10 t/h at

0.4 t/m3(25 pcf)

241mm

(9.5”)

822 mm

(0.875”)

154mm

(6.07”)

279mm

(11”)

22.5° 1250mm

(49.21”)

225mm

(8.86”)

1257mm

(49.50”)

"A"

VIEW "A" - "A"

"A"

infeed flange

junction box

405mm

(16”)

915mm

(36”)

60° 45°

15°

13 mm (0.5”) rod

minimum allowance for

sensing plate installation

discharge

13 mm

(0.5”) rod

minimum allowance for

sensing head access 557mm

(21.9”)

257mm

(10.1”)

12 holes

25 mm

(1”) dia.

4 holes

19 mm

(.75”) dia.

15°

9.5 mm (.38”) typ.

76 mm (3”)

152mm

(6”)

305 mm

(12”)

13 mm (0.5”)

51 mm (2”)

152 mm (6”)

586 mm

(23.1”)

215 mm

(8.5”)

483 mm

(19”)

432mm

(17”) 305mm

(12”)

For the infeed flange:

A = bolt circle diameter

B = number of holes

C = size of holes

D = inside diameter

E = outside diameter

292 mm

(11.5”)

Indice

Lingue:

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