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Nitrogen Quality Report

Booster pump room

Written By: Shane Egner Owner of Egnergy

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Executive Summary

The purpose of this report is to convey the results of two weeks of monitoring the incoming nitrogen gas for booster compressors located in the combined puff area. The report will show the minimum, maximum, average, and standard deviation for the following values: dew point, gas temperature, ambient temperature and pressure.

1: Introduction

An Engineer requested that the quality of the incoming nitrogen for the booster compressors be monitored for a period of two weeks at one hour intervals. The data collection device used has the capabilities to take a reading every 3 seconds, so that is the sample interval that was used. Egnergy performed the monitoring through a sub-contract with CEMSA. Egnergy is an energy optimization and engineering company located in San Antonio, TX. The owner of Egnergy, Shane Egner, is the person responsible for providing the analysis. Shane’s qualifications can be found in figures 1 and 2.

2: Methodology

Dew Point Meter:

The nitrogen pressure dew point was monitored using a Shaw model SDT Dewpoint Transmitter installed at the inlet of booster pump DX2 (S/N CPP900073). The dewpoint transmitter was calibrated March 27 2014. The calibration certificate can be seen in figure 3. The dew point transmitter was installed in the system using a sample cell with a flow rate of 3-5 CFM. The range of the dew point meter is from - 100° C to 0° C with corresponding meter output from 4 – 20 mA. The dewpoint transmitter was connected to the data logger using a 12 VDC power supply in a powered loop configuration. Dew Point is recorded every 3 seconds in units of °C.

Pressure Transducer:

The nitrogen pressure was measured using an Ashcroft Pressure transducer part number G27M0205F2200#G-#4177 installed in at the inlet of booster pump DX1 (S/N CPP900074. The data sheet for the pressure transducer can be found in figure 4. The pressure transducer has a range of 0 – 200 PSIG (0 – 14.6 KG/CM2) with a corresponding meter output from 0 – 5 VDC. The pressure transducer is connected to the logger using a 12 VDC power supply for excitation voltage. Pressure is recorded every 3 seconds in units of KG/CM2.

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Ambient Temperature:

Ambient temperature of the compressor room was measured using a TMC20-HD air/water temperature sensor. The sensor monitored the temperature of the ambient air in °C and was recorded every 3 seconds. The temperature sensor is a plug and play model for the data logger. Data sheets for the TMC20-HD can be found in figure 5.

Gas Temperature:

The temperature of the nitrogen gas was measured using a TMC6-HE flat tip temperature sensor for mounting on pipe. The sensor monitored the temperature of the gas in °C and was recorded every 3 seconds. The temperature sensor is a plug and play model for the data logger. Data sheets for the TMC6-HE can be found in figure 6.

Data Logger:

The measurements for temperature, pressure, and dew point were recorded every 3 seconds using an Onset UX120-006M S/N 10503509. The data is read and graphed through Onset’s software called HOBOware. A free trial version of the software can be downloaded here: http://www.onsetcomp.com/products/software/bhw-pro-dld. This free trial can be used to look at the raw data file included with the electronic version of this report.

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

3: Results

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

** Numbers in red were not calculated in maximum and minimum values due to sensor power loss

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

4: Discussion

The graph of the full length of the report clearly shows the dew point trends with both ambient and gas temperature with little effect from pressure. This is counterintuitive because dew point does not vary with temperature, only pressure. The dew point fluctuations must be coming from the point of nitrogen generation.

5: Conclusions

It is obvious from the data collected from April 3, 2014 through April 20, 2014 that the dew point fluctuates with both ambient and gas temperature. What is not clearly visible from this data is the reason for the fluctuation. Pressure dew point of a gas does not change with a change in temperature, but changes with a change in pressure. It would be interesting to see the dew point during the winter when the ambient temperature drops below freezing. This report meets the specifications set forth by the engineer for monitoring of the nitrogen booster system.

6: Recommendations

It is the recommendation of the author that the same report be generated at the point of generation of the nitrogen. This should be completed at the entrance and the exit of the nitrogen generator to be able to pinpoint the reason for the fluctuation of the dew point of the nitrogen.

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Figure 1

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Figure 2

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Figure 3

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Model G2 Pressure Transducer

Cable

Connection

Hirschmann

Connection

Metri-Pack

Connection

Flying Lead

Connection

LOOK FOR THIS

AGENCY MARK ON

OUR PRODUCTS

APPLICATONS

The G2 pressure transducer combines performance with value to meet the demanding needs of the original equip- ment manufacturer in applications found in:

•Off-road Equipment

•Construction Machinery

•Performance Racing

•Railroad/Transportation

•Compressor Control

•HVAC and Refrigeration

•Agricultural Implements

•Process Automation and Control

•Hydraulic & Pneumatic Sensing

•Pump Monitoring

FEATURES

•1% Total Error Band Accuracy

•Broad Temperature Capability

•All-welded pressure construction

•High EMI/RFI rating

•Ranges 30 psi through 20,000 psi

•IP 67 Ingress rating

•Diagnostic rails

The Ashcroft® Type G2† pressure transducer has been specifically designed with the high volume OEM in mind.

A ±1% Total Error Band accuracy is accom- plished by marrying a high performance ASIC to a very stable, field proven polysilicon thin film pressure sensor. The sensor is electron beam welded to a pressure fitting of stainless steel, which provides excellent overpressure capability and outstanding durability in the presence of shock and vibration.

The circuitry is held within an internal cage and housed in an enclosure of reinforced Nylon.

TOTAL ERROR BAND (TEB)

Error limits of all points (0-100% of range)

	2.0%
	1.5%
of span)	1.0%
	0.5%
	0.0%
(%
Error	-0.5%
	-0.5%

	-1.0%
	-1.5%
	-2.0%
	-2.0%

-60	-40	-20	0	20	40	60	80	100	120	140
		Ambient Temperature (C)						Pos Error Limit
								Neg Error Limit

	All specifications are subject to change without notice.
	All sales subject to standard terms and conditions.
BULLETIN G2	© 2013 Ashcroft Inc., Rev. 08/13

PERFORMANCE SPECIFICATIONS

Ref. Condition 21°C ±1°C (72°F ±2°F)

Accuracy:

Total Error Band includes combined effects of temper- ature, non-linearity (Terminal Point Method), hysteresis, non repeatabilty, zero offset and span setting errors

±1% of Span: From –20 to 85ºC (–4 to 185ºF)

±1.5% of Span: From –40 to –20ºC (–40 to –4ºF) ±1.5% of Span: From 85 to 125ºC (185 to 257ºF)

Note: Static accuracy ±0.25% of span BFSL (Best Fit Straight Line Method); includes non-linearity, hysteresis and non-repeatable effects at reference temperature 72°F (21°C)

Stability: Less than ±0.25% span/year Durability: Tested to 50 million cycles

ENVIRONMENTAL SPECIFICATIONS

Temperature:
Compensated	–40 to 125°C	(–40 to 257°F)
Operating	–40 to 125°C	(–40 to 257°F)
Storage	–40 to 125°C	(–40 to 257°F)

Humidity: 0 to 100% R.H., no effect

FUNCTIONAL SPECIFICATIONS

Select from over 25 pressure ranges starting at 30 psi and running through 20,000 psi gauge. Compound (vacuum & pressure) ranges are also available, see “To Order” on back.

Overpressure (F.S.):	Proof		Burst
750 psi & below	200%	F.S. 1000% F.S.
1500 psi	200%	F.S.	500% F.S.
3000 psi	200%	F.S.	500% F.S.
5000 psi	150%	F.S.	500% F.S.
7500 psi	120%	F.S.	500% F.S.
10,000 psi	120%	F.S.	240% F.S.
20,000 psi	120%	F.S.	240% F.S.

Vibration: Random vibration (20 g) over tempera- ture range (–40° to 125°C). Exceeds typical MIL. STD. requirements

Shock: 100gs, 6 ms

Drop Test: Withstands 1 meter on concrete 3 axis

Response Time: Less than 1 msec

Warm-up Time: Less than 500 msec typical Position Effect: Less than ±0.01% span, typical

ELECTRICAL SPECIFICATIONS

Output Signals Available:		Supply
		Supply
Voltage Output	Excitation	Current
0-5 Vdc, 3 wire	9-36 Vdc	5mA
0-10 Vdc, 3 wire	14-36 Vdc	5mA
1-5 Vdc, 3 wire	9-36 Vdc	4mA
1-6 Vdc, 3 wire	9-36 Vdc	4mA
0.5-4.5Vdc, 3 wire	9-36Vdc	4mA
Ratiometric Output:
0.5-4.5 Vdc, 3 wire	5 Vdc ±0.5 Vdc	3.5mA
Current Output:
4-20mA, 2 wire	9-36 Vdc

Reverse Polarity & Miswired Protected: Yes Insulation Breakdown Voltage: 100 Vac

Insulation Resistance: Greater than 100 megohms at 100 Vdc

CE Marked: Per DoC

EMC Directive 2004/108/EC

IEC/EN 61326-1:Edition 1.0 Industrial

IEC/EN 61326-2-3:Edition 1.0 Annex BB Industrial PED Directive

Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA Tel: 203-385-0648 • Fax: 203-385-0408

email: [email protected] • www.ashcroft.com

Figure 4

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

Figure 5

Soplo Combinado nitrogen booster incoming gas quality report

Egnergy

19718 Ranch Meadow

San Antonio, TX 78258

210-560-6568

TMCx-HE Temperature Sensor

For use with HOBO® U12 and UX120-006M data loggers and ZW data

nodes

Specifications

Measurement Range	-40° to 100°C (-40° to 212°F)
Accuracy with U12	±0.25°C from 0° to 50°C (±0.45°F from 32° to
	122°F), insert probe 2.3 cm (0.9 inches)
	minimum; see Plot A
Accuracy with ZW	±0.21°C from 0° to 50°C (±0.38°F from 32° to
	122°F), insert probe 2.3 cm (0.9 inches)
	minimum; see Plot B

Accuracy with	±0.15°C from 0° to 70°C (±0.27°F from 32° to
UX120-006M	158°F), insert probe 2.3 cm (0.9 inches)
	minimum; see Plots C & D
Resolution with U12	0.03° at 20°C (0.05° at 68°F); see Plot A

Resolution with ZW	0.02°C at 25°C (0.04°F at 77°F); see Plot B
Resolution with	0.002° at 25°C (0.003° at 77°F); see Plots C &
UX120-006M	D
Drift	<0.1°C (<0.2°F) per year
Response time in air	2 min. typical to 90% in air moving 1 m/sec
	(2.2 mph)
Response time on a pipe	Typically 2 times faster than the TMCX-HD.
	Typically less than 1 minute to 90%.
Housing	Copper-plated sensor tip

Dimensions	0.9 x 5.8 cm (0.38 x 2.30 inches)

Weight	34 g (1.1 oz)

Plot A: U12 Accuracy/Resolution

Plot C: UX120-006M Accuracy

Plot D: UX120-006M Resolution

Items Included:

•2 tie wraps

•1 #6 screw

•Thermal compound

Mounting the Sensor

Use a small amount of the enclosed thermal compound between the flat part of the sensor tip and the surface where the sensor is being deployed to enhance the contact between the two.

Sensor mounted on pipe using two tie wraps:

Place thermal compound here between the sensor and

the tube

Tie Wraps

Sensor mounted on wall using #6 screw:

Plot B: ZW Accuracy/Resolution	#6 screw	Place thermal
		compound here
		between the sensor
		and the wall

		© 2012–2013 Onset Computer Corporation
		13099-F MAN-TMC6-HE