HDP Series (80-1,500 CFM)
High Pressure Regenerative Dryers 300 -10,000 PSIG
Next’s HPD Regenerative Desiccant dryers are designed for reliable treatment of compressed air in a high-pressure range from 300 to 10000+ psig / 20 to 689+ bar and offer 26+ models from 80 to 1500 CFM. Next’s HPD high-pressure twin tower desiccant dryer series are engineered to dry compressed air and gasses for sensitive high-pressure applications. The HPD series dryers come in five different pressure classes: 300 psig / 20 bar, 1500 psig / 100 bar, 3600 psig / 250 bar, 5000-10000 psig / 350-689 bar with pressure dew points of -40 ° F to -100 °F / -40 ° C to -7.3 °C. The HPD series comes standard with High-Pressure Pre & Post mounted filtration, accompanied by an advanced 4.6 HMI Touch Screen Controller. Construction includes a rugged welded coated steel twin tower design and high-pressure 316 stainless steel control air tubing on select HPD models.
The HPD series comes standard with High-Pressure Pre & Post mounted filtration, accompanied by an advanced 4.6 HMI Touch Screen Controller. Construction includes a rugged welded coated steel twin tower design and high-pressure 316 stainless steel control air tubing on select HPD models.
- HPD 300 Series (80-1500 CFM) @ 300 PSIG / 20 Barg
- HPD 1500 Series (100-500 CFM) @ 1,500 PSIG/100 Barg
- HPD 3600 Series (100-500 CFM) @ 3,600 PSIG/250 Barg
- HPD 5000 -10000 Series (100-500 CFM) @ 5,000-10000 PSIG/350-689 Barg
HDP Series Features
- Mounted Filtration
- NHDC-2300, 4.6 HMI -Touch Screen Controller
- UL, CUL, Electrical Certifications
- High Pressure non-lubricated Inlet Valves
- Tower Pressure Relief Valves
- Purge Adjustment Valve
- Purge Flow indicator
- Horizontal Purge exhaust mufflers
- Tower Pressure Gauges
- Stainless steel Desiccant Strainers
- Counter-Current Re-pressurization
- Nema-12 Electrical enclosure
- ASME VIII Certified (300 psig)
- Field adjustable Drying Cycle time (6,10,15 min)
- Stainless Steel Control Air Tubing (1500+ Psig Series)
- Separate Drain and Fill port
- Fail Safe Design
- Common Alarm Contact
NHDC-2300 Controller
- 4.6 Color touch screen HMI interface
- Energy management system
- Main display shows the following information
- Dewpoint
- Drying, Regenerating, and Repressurizing Side
- Time Remaining for each state
- Outputs 10+
- Digital Dewpoint Trend
- Alarm status
- Alarm log
- Process History
- Energy Savings
- Filter maintenance indicator
- Modbus TCP communication
- Remote Start Stop
Operating Voltage
- 110, 115 V / 1 PH / 50-60 HZ
- 230/208/220 V / 1 PH / 50-60 HZ –(Optional)
- 24 V DC- (Optional)
Pressure Vessel Certification
- ASME VIII, CRN
(300 Psig series) All Provinces
Control Panel Certification
- UL & CUL
- CSA- (Optional)
Pre & Post Filtration Microns
- Pre-Filtration grade 0.01 μm
- Post-Filtration grade 1 μm
- Secondary-Post Filtration 1 μm (Optional)
Electrical Enclosure Rating
- NEMA 12
Average Purge Air*
- 3-15%
Outlet Pressure Dew Point
- -40° F / ° C
- -100 ° F / -73° C (Optional)
Min/Max inlet air temperature ° F / ° C
- 40/120 ° F
- 4.4/48 ° C
Max Operating Pressure
- 300 Psig / 20 Bar
- 1500 Psig / 100 Bar
- 3600 Psig / 250 Bar
- 5000-10000 Psig / 350-689 Bar
Model HDP Series Dryers
Additional Flows and Pressures available upon request.
HDP Optional Features
(If an option is not listed please contact our sales team to accommodate any additional options. )
ALTERNATE VOLTAGES:
- ALT-V-1: 208-230 VOLTS / 1 PHASE / 50-60 HZ
- ALT-V-2: 24 VOLT DC
- ALT-V-3: 12 VOLT DC
- PC: PNEUMATIC CONTROL
ELECTRICAL ENCLOSURE:
- N4 NEMA 4: ELECTRICAL ENCLOSURE
- N4X-P NEAMA 4X: POLYCARBONATE ELECTRICAL ENCLOSURE
- N4X NEMA 4X: STAINLESS STEEL ELECTRICAL ENCLOSURE
- N7 NEMA 7: EXPLOSION PROOF
ELECTRICAL ENCLOSURE CONTROLLER:
- ALT-C-1 NHDC-2201: (DIGITAL CONTROLLER)
- ALT-C-3 NHABC: (ALLEN BRADLEY INTERFACE)
- ALT-C-4 NHSC: (SIEMENS INTERFACE)
CONDENSATE DRAIN:
- EFD: EXTERNAL FLOAT DRAIN
- EZLD: ELECTRONIC ZERO LOSS DRAIN
- PZLD: PNEUMATIC ZERO LOSS DRAIN
- HPTD: HIGH PRESSURE TIMER DRAIN
DEW POINT & DIGITAL MONITORING:
- DCC+DDP: DEMAND CYCLE CONTROL
- DDPM-40: DIGITAL DEW POINT MONITOR (-40° F/ -73° C)
- DDP-40: DIGITAL DEW POINT SENSOR (-40° F/°C)
- DDP-100: DIGITAL DEW POINT SENSOR (-100° F/ -73° C)
- FTS: FAILURE TO SWITCH ALARM
- DCA: DRY CONTACT ALARM
- ESS: EMERGENCY STOP SWITCH
- RSS: REMOTE START / STOP
BYPASS:
- 3VBP: THREE VALVE BYPASS
- 9VBP: NINE VALVE BYPASS
FILTRATION:
- DPF DUAL PRE FILTER
- DAF: DUAL AFTER FILTER
- SP-F: SPECIAL FILTER CONFIGURATION
- FS: FILTER SKID
- RSS: REMOTE START / STOP
PACKAGES:
- LAP: LOW AMBIENT PACKAGE
- SZ: SUBZERO PACKAGE
- RS: RENTAL SKID
CONSTRUCTION:
- NYM: NO YELLOW METAL
- SP-DIM: SPECIAL – DIMENSION
- CSA: CANADIAN STANDARDS ASSOCIATION
- CRN: CANADIAN REGISTRATION NUMBER (3000+ CFM)
- BTS: BUILT TO SUIT
- IOPG: INLET-OUTLET PRESSURE GAUGE
- IOTG: INLET-OUTLET TEMPERATURE GAUGE
- TTG: TANK MOUNTED TEMPERATURE GAUGE
- VMI: VISUAL MOISTURE INDICATOR
- SST: STAINLESS STEEL CONTROL AIR TUBING
- CR: CONTROL LINE PRESSURE REGULATOR
- EPH: ELECTRICAL PANEL HEATER
- AC: AFTERCOOLER
- TAG: STANDARD STAINLESS STEEL ID TAGS
- MGP: MARINE GRADE 2 PART EPOXY PRIMER & PAINT
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Next’s HPD Regenerative Desiccant dryers are designed for reliable treatment of compressed air in a high-pressure range from 300 to 10000+ psig / 20 to 689+ bar and offer 26+ models from 80 to 1500 CFM. Next’s HPD high-pressure twin tower desiccant dryer series are engineered to dry compressed air and gasses for sensitive high-pressure applications. The HPD series dryers come in five different pressure classes: 300 psig / 20 bar, 1500 psig / 100 bar, 3600 psig / 250 bar, 5000-10000 psig / 350-689 bar with pressure dew points of -40 ° F to -100 °F / -40 ° C to -7.3 °C. The HPD series comes standard with High-Pressure Pre & Post mounted filtration, accompanied by an advanced 4.6 HMI Touch Screen Controller. Construction includes a rugged welded coated steel twin tower design and high-pressure 316 stainless steel control air tubing on select HPD models.
Principle of Operation
The NEXT HPD series is extremely simple and efficient in design, it uses dry compressed air for regeneration. The hard, attrition resistant activated alumina is contained in dual towers. While the compressed air is being dried in one tower the desiccant in the other tower is reactivated.
For regeneration of the desiccant, a small amount of the dried air (from the drying tower is expanded to near atmospheric pressure in the regenerating tower. The dry air becomes super dry on expansion and readily absorbs the moisture from the saturated desiccant bed.
Because they require neither heat nor blower and utilize up draft drying and counter flow regeneration.
HPD series offers maximum reliability. An HMI and PLC control the entire drying and regeneration process. Replacement of desiccant every few years is about the only maintenance cost.
Due to their low initial cost and low maintenance cost, HPD dryers are generally used whenever sufficient compressed air capacity is available with the need of higher pressures.
Overview
Next Air & Gas Performance Advantages
The performance of any desiccant dryer depends on the quality of its key components. Next Air & Gas uses the best available valves, controllers and desiccant. With accurately designed and sized components, the dryers are manufactured to provide you with years of trouble-free operation.
State of the Art PLC with Touch Screen Interface
The entire drying/ regeneration cycle is controlled by a Micro-Logix programmable logic controller (PLC), among the most reliable controllers available. The plc is supplied with a 4.6″ touch screen HMI display which, among other items, will provide the operator with the following information.
- 4.6 Color Touchscreen HMI Interface
- Energy Management System
- Main Display Provides Multiple “at a glance” Data Points:
- Dew Point -OP+
- Drying, Regenerating, and Repressurizing Side
- Time Remaining for Each State
- Alarm Status
- Process History
- % Energy Savings
- Filter Maintenance Indicator
- Modbus TCP Communication
- Remote Start Stop
- Outputs 10+
- Digital Dew Point Control Dew Point Trend
Pressure Vessels
HPD desiccant vessels have been designed with a wide diameter for a large cross- sectional flow area. This results in a low flow velocity which minimizes both pressures drop across the bed and attrition of the desiccant itself. The Vessels incorporate the flowing additional features:
- Stainless steel inlet and outlet air diffusers for even flow distribution
- Stainless steel bed support on units above 1,500 scfm
- Desiccant fill and drain ports
- 1/16” corrosion allowance
- Operating pressure gauge on each vessel
Pressure relief Valve on each vessel.
Digital Dewpoint Transmitters Optimize Operations
NEXT’s FAN-500 and 510 are the ideal dew point sensors for monitoring dew point changes for our desiccant dryers. If your needs include a set dew point of -40° F or -100° F, NEXT’s range of dew point sensors has it covered.
- Modbus-RTU Interface
- Higher Resolution of Sensor Signal Through Improved Evaluation Electronics
- Integrated Display (Fan-500)
- Pressure-tight up to 5,000 psig./350 Bar (special version)
- Extreme Long-Term Stability
- Quick Response Time
Quality Desiccant Media
Next Air & Gas uses a mixture of adsorption media in its heatless range of desiccant dryers to achieve consistent dewpoint. Activated Alumina, Molecular Sieve and Silica Gel are used in varying ratios depending on the application. The long lasting, high crush strength media has a very high surface/volume ratio. Beaded activated alumina is used as the adsorption media in heated desiccant dryers. The beads exhibit a very high internal surface area and high moisture separation efficiency. Each lot of desiccants is thoroughly tested for density, moisture content, abrasion resistance, surface area, mesh size and granule strength to assure that it meets strict design requirements.
Actuator Valves for Precise Control
These versatile, high-pressure ball valves are used by Next Air & Gas to provide you with precision control and complete bubble-tight shut off. The digitally controlled actuators provide an easy PLC interface and feature fast response time. The bi-directional trunnion style design ensures optimal performance up to 20,000 psig. Rugged and reliable, these valves are designed to provide years of trouble-free service.
Angle Body Piston Valve
These high-performance, 2-way direct acting valves are designed for reliability and durability. They utilize a profiled disc in conjunction with a high-resolution compact positioner and linear feedback potentiometer to provide precise proportional flow. The stainless-steel internals and a tough fiber composite actuator body, along with the use of oversized bearing and Viton® seals, make it possible to consistently provide smooth piston movement for years of trouble-free service. Angle body valves are used to control depressurization of the regenerating vessel and to control the dry purge air flow during the cooling phase of the process. Angle body valves offer high flow rates and long service life in compact, economical packages.
PREMIUM PLEATED & WRAPPED COMPRESSED AIR FILTERS
Next offers superior filtration from 1 micron to 0.01 micron, and connections from ½” NPT to 10” FLG. Next Filters are engineered to be efficient under any parameter. Next elements offer a durable element construction with an efficient drain layer to ensure continued performance after optimal element change periods.
