SECTION 11650E DETAIL BIOSOLIDS THERMAL DRYING SYSTEM LIQUID RING COMPRESSOR

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 11650E

DETAIL BIOSOLIDS THERMAL DRYING SYSTEM LIQUID RING COMPRESSOR


PART 1 GENERAL

1.1 SECTION INCLUDES:

A. Liquid Ring Compressor:
1. Dryer Off Gas Compressor: P-11-10.

B. Major Components for Each Compressor:
1. Liquid ring compressors.
2. Motors.
3. Water separator (T-11-10).
4. Equipment base.
5. Accessories.
6. Electrical controls.

1.2 SYSTEM DESCRIPTION

A. The dryer off-gas compressor will be used to compress and pump odorous air from the off-gas system from the biosolids dryer to the aeration basins.

1.3 REFERENCES

A. See General Specification Section 11650, Solids Thermal Drying System – General.

1.4 DESIGN REQUIREMENT

A. See General Specification Section 11650, Solids Thermal Drying System – General.

B. General Requirements:
1. Suitable for use with Dryer System Off Gas.
2. Discharge pressure , psig: 8.
3. Capacity, scfm: 300.
4. Inlet gas conditions: -2 to 8-inches of W.C. pressure, 95°F, and fully saturated.
5. Seal Water Temperature: 50° to 70°F.
6. Typical Dry-gas Constituent Mix:
a. Nitrogen: 78% by weight.
b. Oxygen: 21% by weight.
c. Carbon Dioxide: 1% by weight.
d. Volatile Organic Compounds: Small amounts.
e. Other Impurities: Small amounts.
7. Compressor(s) will be used to compress off gas from low pressure (1 in. wc vacuum) system to aeration basin at 8.0 psig pressure.
8. Each compressor and all components shall be completely assembled, factory engineered, skid-mounted package.

C. Performance Requirements:
1. Maximum allowable gas discharge temperature of 150°F at design load.
2. Maximum allowable unloaded brake horsepower, 25% full load.
3. Maximum allowable variation from specified performance criteria on volume and brake horsepower, ±3%.
4. Motor Horsepower: 40.

1.5 SUBMITTALS

A. See General Specification Section 11650, Solids Thermal Drying System - General:
1. Product Data: Manufacturer's specifications for units showing dimensions, weights, capacities, ratings, performance characteristics, gauges, color and finish of materials, and installation instructions.
2. Complete assembly and installation drawings showing unit dimensions, construction details, and field connection details.
3. Descriptive information on material and equipment furnished.
4. Electrical data including electric motor data, electrical requirements for power supply and ladder type wiring diagrams.
5. Performance data including:
a. Flow.
b. Pressure.

B. Test Reports: Submit [independently certified] performance test results in report form showing conformance with ASME PTC-9 under the provisions of Division 1.

C. Submit certificates of proper installation and operator training under the provisions of Division 1.

1.6 OPERATION AND MAINTENANCE DATA

A. See General Specification Section 11650, Solids Thermal Drying System - General.

1.7 DELIVERY, STORAGE AND HANDLING

A. See General Specification Section 11650, Solids Thermal Drying System - General.

1.8 QUALITY ASSURANCE

A. See General Specification Section 11650, Solids Thermal Drying System - General.

1.9 EQUIPMENT SUPPLIER'S QUALIFICATIONS:

A. See General Specification Section 11650, Solids Thermal Drying System - General.

1.10 PAYMENT SCHEDULE

A. See General Specification Section 11650, Solids Thermal Drying System – General.

PART 2 PRODUCTS

2.1 ACCEPTABLE EQUIPMENT SUPPLIERS

A. Komline-Sanderson, Peapack, NJ.
1. The contract documents are based on this equipment.

B. Andritz Separation Inc., Arlington, TX.
1. Bidders proposing to offer Andritz Separation as the Equipment Supplier shall incorporate in the price all additional costs for and be responsible for layout, piping, plumbing, mechanical, HVAC, structural, instrumentation and control, electrical, and all other changes to the Work required to incorporate the proposed equipment into the Work.

C. Or Equal.

2.2 GENERAL

A. See General Specification Section 11650, Solids Thermal Drying System – General.

2.3 METAL FABRICATION

A. See General Specification Section 11650, Solids Thermal Drying System – General.

2.4 EQUIPMENT

A. Motor:
1. Furnish motor compatible with the driven equipment herein. Motors shall be furnished as specified in Section 11338, and shall conform to the detailed requirements herein:
2. Motor nameplate horsepower: See design requirements.
a. Type drive: Variable speed Inverter Duty Rated.
b. Nominal (synchronous) motor rpm: 1800.
c. Motor mounting: Horizontal.
d. Enclosure: NEMA 7 Explosion Proof.
e. Power: 460 volt, 3 phase, 60 Hz.
f. The motor shall have NEMA B starting torque and low starting current. The motor shall not be overloaded beyond the nameplate rating under any normal conditions encountered.
g. Motor to be provided with Klixon bimetal opening contact type overload temperature sensor in each phase winding. Sensors shall open when motor temperature exceeds manufacture recommended operation temperature and shall automatically reset when motor temperature reaches safe operating temperature. Sensors to be connected in series, with each sensor located in the hottest spot of the phase windings.

B. Mechanical Drive:
1. Direct: Neoprene sleeved flexible couplings, Woods, Rexnord or equal with OSHA approved guard.

C. Compressors:
1. Oil-free, single stage, non-pulsating, positive displacement, rotary, water sealed, liquid ring type with single acting casing for compression power efficiency.
a. Compressor shall have a 1-piece cast rotor with 2 port plates in a single stage design with easily adjustable internal clearances. Compressor shall have mechanical shaft seals. All gaskets shall be Teflon.
b. Compressor shall have 2-in. 150 lb flanged inlet and discharge connections.
c. Bearings:
1) Anti-friction bearings with a minimum bearing life of 10 years.
2) Provide an idle end bearing with a fixed design for thrust loading.
d. Compressor shall have design a working pressure of 30 psig and a hydro pressure of 45 psig. Compressor shall have an operating pressure of 0-22 psig.
e. Mount each compressor and motor on fabricated steel base plate. Motor and compressor shall have coupled drive.
f. Furnish each compressor with inlet manifold, discharge manifold, and

D. Compressor Base:
1. Construction: Minimum 3/8-inch thick fabricated steel or cast iron.
2. Provide common compressor base and motor mounting.
3. Factory mount complete compressing unit including motor, compressor, water separator, and accessories.
4. Provide grout holes.

2.5 ACCESSORIES

A. Each compressor system shall be furnished with compressor manufacturer’s recommended accessories including, but not limited to the following:
1. Inlet and discharge check valve.
2. Water separator.
3. Gas pressure relief valve.
4. Compressor recycle line valve.
5. Gas pressure gauges.
6. Low and high pressure switches.
7. Seal line solenoid valve.
8. Seal line strainer.
9. Seal line pressure control valve.
10. Seal line flow sensor.
11. Seal line pressure gauge.
12. Seal line flow switch low.
13. Flow control valve

B. Check Valves: Provide check valves for inlet and discharge piping of each compressor. Check valves shall be suitable for use in digester gas. Inlet check valves shall be Varec 211 Series, or equal.

C. Water Separators:
1. Provide water separator for each compressor.

2. Install separator on compressor discharge piping for removing compressor seal water.
3. Fabricate out of 316 stainless steel, with stainless steel internals.
4. Design, constructed, and stamped in accordance with ASME, Section 8.
5. Design minimum working pressure of 15 psig.
6. 316 Stainless steel ball float valve.
7. Gauge glass.
8. 1-in. drain connection.
9. Provide automatic water level control utilizing Level Control Valve (LCV-11-10) and High Level Switch (LSH-11-10).

D. Gas Pressure Relief Valves:
1. Provide pressure relief valve with each compressor. Relief shall be piped to compressor suction.
2. Pressure relief valve and associated piping shall be sized by compressor manufacturer.
3. Valves shall be suitable for use with digester gas.
4. Valves shall be Fischer Figure 289H, or equal.

E. Provide line strainer for removing impurities from seal water to each unit.

F. Seal Line Pressure Control Valves (PCV-11-10):
1. W3 water supply pressure is approximately 50 to 90 psig at gas compressor room. Reduce pressure to flow and pressure requirements of gas compressor.

G. Seal Line Flow Indicators (FI-11-10):
1. Provide flow indicators in seal water feed limits to provide local indication of rate of seal water flow. Indicator shall rotameter with glass tube, Type 316 stainless steel end fittings and float.

H. Shutoff ball valves.
1. Provide V300 ball valves as specified in Specification Section 15100 VALVES for seal water (W3) isolation.

I. Flow Valves (FV-11-10):
1. Provide V1010 solenoid valves as specified in Specification Section 15100 VALVES for seal water (W3) control (120 Vac).

J. Flow Control Valves:
1. Provide V220 needle disc type globe valves as specified in Specification Section 15100 VALVES for controlling rate of seal water flow to compressor.

K. Piping:
1. 2-inch and smaller: 316 stainless steel, schedule 40, threaded.
2. Over 2-inch: 316 stainless steel, schedule 10, butt-welded.

2.6 FABRICATION

A. Tolerances: Factory-align couplings to within ±0.006 in. misalignment tolerance.

2.7 FINISHING

A. Shop and Field Painting: Conform to Section 09900, and the following requirements:
1. Verify compatibility of shop prime and field paint.
2. Finish all non-stainless steel and reinforced fiberglass surfaces as follows:
a. Submerged Surfaces: Conform to Section 09900, System No. 2.
b. Non-Submerged Surfaces: Conform to Section 09900, System No. 5.

2.8 INSTRUMENTATION AND CONTROL

A. Flow Switch Low (FSL-11-10):
1. Provide thermal dispersion flow switch.
2. 24 Vdc power supply.
3. NEMA 4X, 7 & 9 enclosure.
4. Single pole, single throw, 10 amp 120Vac contact.
5. Provide all mounting hardware.

B. Motor High Temp Switch (TSH-11-10-1):
1. Klixon (See motor spec).

C. Pressure Gauges (PI-11-10):
1. See Specification Section 15135 METERS AND GAUGES.
2. Provide snubber and isolation valve for each gauge.

D. Water Separator Level Indicator (LI-11-10):
1. Provide visual indication of water level in tank.

E. Adjustable Frequency Drives Controlled Speed Drives:
1. Not furnished with this section.


PART 3 EXECUTION

3.1 INSTALLATION

A. In accordance with Drawings, shop drawings and manufacturer's instructions.

B. Install unit level on unit foundation. Shim unit as required to level and anchor in-place.

C. Field align couplings to within ±0.002 in. misalignment tolerance.

3.2 TESTS:

A. Conduct OWNER-witnessed factory performance tests in accordance with ASME PTC-1 and PTC-9.

B. Notify ENGINEER and OWNER not less than 7 days before testing of time and location of test.

C. Equipment shall not be accepted unless test report and results are found to be in compliance with these Specifications.

3.3 MANUFACTURER'S SERVICES

A. See General Specification Section 11650, Solids Thermal Drying System - General.

B. Minimum service requirements:
1. Installation: As required for proper installation.
2. Start-up and field testing: One (1) eight (8) hour day (not necessarily consecutive) on site.
3. Operator training: One half day on site.

C. Service to Repair Defective Work: Provide during one-year warranty period under the provisions of General Conditions.


END OF SECTION