This simple, turnkey Membrane type Nitrogen Generator provides a cost-effective means for on-site gas generation. It is based on using the latest membrane technology to separate nitrogen from the other gases contained in air. Holtec offers one of the most efficient and durable Nitrogen Generation Systems on the market.

The Nitrogen Generator uses one or more permeable hollow fiber type membrane modules to separate compressed air into a high-pressure nitrogen product stream and a low-pressure oxygen enriched waste stream. Typical feed air pressure is 125 psig/8.6 barg. Operation at higher pressure will increase the product flow. Typical product purity for our systems is 97%. Product flow rate for the same system will be higher with better nitrogen recovery if if a higher oxygen content can be accepted in the nitrogen product. Systems are available with a product purity up to 99.9% nitrogen.

Generators are supplied as complete systems, ready for hookup to a compressed air supply, and it includes air filters and controls for automatic operation. Start up is at the flip of a switch and maintenance is limited to changing filters every three to twelve months. Each Nitrogen Generator comes pre-tested and fine tuned to meet the customer specified nitrogen flow rate and purity.

Holtec Gas Systems (Holtec) offers an affordable alternative to high-pressure nitrogen bottles or liquid nitrogen and our nitrogen generators have proven to be very popular and reliable for many applications. Producing your nitrogen in a Holtec Membrane Nitrogen Generator reduces the nitrogen cost and eliminates the hassles and safety issues you have with high-pressure nitrogen bottles or liquid nitrogen.

The specifications for some of our standard systems for production of 97% nitrogen (3% O₂) when operated at 125 psig / 8.6 barg pressure are as follows:

Model no.	HMN-7	HMN-14	HMN-21	HMN-35	HMN-70	HMN-105	HMN-140	HMN-175
N2 Flow, Nm3/h	4.6	9.3	13.9	23.7	47.4	71.1	94.8	118.5
N2 Flow, SCFH	173	346	519	884	1,769	2,653	3,537	4,421
Size, in. L x W x H	24" 12" 48"	24" 12" 48"	24" 12" 48"	36" 12" 60"	36" 12" 60	48" 16" 72"	60" 16" 72"	72" 16" 84"
Size, mm. L x W x H	610 305 1219	610 305 1219	610 305 1219	914 305 1524	914 305 1524	1219 406 1829	1524 406 1829	1829 406 2134

(Consult Holtec for other purities and flow rates ranging from about 0.5 to 5,000+ Nm³/h.)

Standard Holtec HMN-7/14/21, HMN-35 and HMN-70 membrane nitrogen generators with oxygen analyzers and digital heater controls are shown below from left to right in the three left pictures. A custom made HMN-35 membrane nitrogen generator mounted on a tank for easy site installation is shown below in the right picture. Holtec's scope of supply included a high-pressure booster compressor w. control system and a feed air compressor (not shown).