Ingersoll Rand MM350-2S Air Filter Element 47742051001 | OEM Compressor Part

Product Overview

47742051001 is the intake air filter element for the Ingersoll Rand MM350-2S two-stage rotary screw air compressor. It installs inside the external air filter housing, upstream of the airend intake. Ambient air passes through the element first; dust, sand, and fibers are retained on the media surface and within its depth, so only clean air reaches the two-stage airend.

Why the duty matters: the MM350-2S is a 350 kW two-stage machine delivering 64.1 m³/min at 8.5 bar(g). Intake volume is proportionally large, so the element must handle a high airflow per unit time — which is why its media area and structural rigidity differ from filters used on smaller machines.

Filter condition directly affects airend life. Unfiltered air lets hard particles accelerate rotor and bearing wear and contaminates the downstream separator element, oil filter, and lubricant. Severe clogging reduces intake volume, lowering discharge capacity and raising specific power. For continuous-duty machines in this class, one unplanned stop costs far more than the filter itself.

Key Specifications

• Part number: 47742051001
• Product: Air filter element
• Brand: Ingersoll Rand
• Application: MM350-2S two-stage rotary screw compressor (350 kW)
• Machine discharge: 64.1 m³/min @ 8.5 bar(g)
• Type: Dry pleated element
• Filtration rating: 5–10 μm
• Service interval: 2,000 hours or 3 months

Technical Parameters

Filtration Performance

• Filtration rating: 5–10 μm
• Filtration efficiency: ≥98% for particles ≥5 μm
• Filter class: intake air filters are characterized per ISO 5011 by efficiency, restriction, and dust-holding capacity — not by the EN 779 HVAC classification

Flow and Restriction

• Rated airflow: matched to MM350-2S intake volume (64.1 m³/min @ 8.5 bar discharge)
• Initial pressure drop: approx. 0.5–1.0 kPa (approx. 50–100 mmH₂O)
• Alarm / final restriction: per the machine intake restriction indicator or controller vacuum alarm
• Restriction vs. energy: each 1 kPa rise in intake restriction increases machine energy consumption by roughly 1%

As intake restriction rises, intake pressure and density fall, and the machine must work harder to hold set discharge pressure and flow. Based on theoretical compression-ratio calculation at 0.8 MPa discharge and 101.3 kPa atmospheric:

• 0 kPa restriction (new element): compression ratio 8.90 — baseline
• 2 kPa: ratio 9.08 — approx. +2.0%
• 4 kPa: ratio 9.26 — approx. +4.1%
• 6 kPa: ratio 9.45 — approx. +6.2%

For a 350 kW machine running 8,000 hours per year, energy drift from new to heavily clogged can reach roughly 6% — electricity cost far exceeding the price of a filter set. This is why large machines should be serviced by restriction reading, not by calendar alone.

Construction and Materials

• Media: imported wood-pulp filter paper (industry-common HV or Ahlstrom grades)
• Media weight: approx. 130 g/m²
• Support: galvanized steel perforated inner core and outer guard
• End caps: metal (galvanized steel) bonded with polyurethane adhesive
• Seal: face seal ring, oil-resistant rubber
• Bonding: polyurethane (PU) hot-melt adhesive

Operating and Service Limits

• Operating temperature: −10 to +100 °C
• Relative humidity: ≤80% RH, no condensation
• Media burst strength: approx. 200–400 kPa (per ISO 2758)
• Collapse resistance: element must withstand machine intake alarm differential without collapse
• Special features: no flame-retardant, anti-static, or special coating claims for this part number
• Service life: 2,000 hours or 3 months, whichever comes first; in high-dust environments replace when restriction enters the alarm zone
• Shelf life: approx. 2–3 years, unopened, dry and ventilated storage

Standards

• Applicable product standard: ISO 5011 (intake air filters for engines and compressors — performance testing: efficiency, restriction, dust-holding capacity)
• Commonly cited test standards: ISO 2941 / 2942 / 2943 / 3723 / 3724 / 3968
• Note: the ISO 29xx / 37xx series are hydraulic filter test methods. If a supplier can only cite hydraulic standards, request ISO 5011 data or the OEM specification sheet.

Maintenance and Installation Steps

External filter housings on large two-stage machines are sizable; allow 30–40 minutes and use two people.

1. Shut down, confirm zero pressure, lock out/tag out. Isolate main power, lock out, and open the receiver drain to relieve pressure. Confirm the controller shows 0 pressure and no residual air flow.
2. Open the air filter housing. Release the end-cap latches or bolts in a diagonal sequence. Check the cap for distortion and latches for seizure. Support large caps before releasing the final fastener.
3. Remove the old element and inspect. Pull the element straight out; use lifting assistance given its size and weight. Uniform gray-brown dust loading is normal. Oily residue indicates oil carryover upstream and should be investigated. Ruptured media, debonded end caps, or a flattened seal mean immediate replacement.
4. Clean the housing interior. Wipe the inner walls, base, and sealing face with a dry, lint-free cloth. Do not blow compressed air into the housing — it drives dust into the intake. Confirm no loose dust and a flat, pit-free sealing face. In humid climates, check for condensate at the base.
5. Verify the new element and install. Compare mounting diameter, overall height, and seal dimensions and type against the old part. Seat the element fully with the seal contacting evenly and no trapped material. The element should be centered, with uniform seal compression around the face.
6. Refit and tighten the end cap. Tighten latches or bolts evenly in a diagonal sequence. The gap between cap and housing should be uniform with no visible skew.
7. Start up and verify. Restore power and run the machine for 5–10 minutes, then read intake restriction. Restriction should sit within the new-element baseline range, with no abnormal whistling at the intake (which typically indicates an unseated element or uncompressed seal). Record date, running hours, and restriction reading.

Non-negotiable rule: never start the machine before the element is properly seated. Running without an element, or with an uncompressed seal, sends unfiltered air straight into the two-stage airend and can cause irreversible wear in a short time.

Frequently Asked Questions

Which machines use 47742051001?
The Ingersoll Rand MM350-2S two-stage rotary screw compressor — 350 kW, 8.5 bar(g), 64.1 m³/min discharge. It belongs to the SSR two-stage 350 kW platform.

Is this the same air filter as the ML350-2S or MH350-2S?
The SSR 350 kW two-stage platform is divided by discharge pressure into four models: ML (7.5 bar), MM (8.5 bar), MH (10 bar), and MXU (14 bar). This part corresponds to the MM350-2S. Whether other pressure ratings share the same filter configuration must be confirmed against the machine nameplate and the parts manual supplied with the unit.

How often should it be replaced?
The recommended interval is 2,000 hours or 3 months, whichever comes first. A more accurate approach is to read intake restriction and replace when it enters the alarm zone. In dusty sites, replace by restriction rather than waiting for the calendar.

Can I blow it clean and reuse it?
No. This is a dry, single-use element designed not to be washed or re-blown. Compressed air only removes surface dust; embedded fine particles stay in the media, and back-blowing pressure can fracture fibers or distort pleats, creating invisible bypass paths. A cleaned element may look fine while no longer performing.

Why is timely replacement critical on this machine?
The MM350-2S is a 350 kW continuous-duty unit. Each 1 kPa of intake restriction adds roughly 1% energy consumption; from new to heavily clogged, energy drift can reach about 6%. At 8,000 running hours per year, that electricity cost far exceeds a filter set. Unfiltered air also contaminates the two-stage airend, separator element, and lubricant — making this one of the highest-return maintenance items.

How do I confirm the filter will fit?
Three steps: (1) confirm the machine nameplate reads MM350-2S; (2) measure the old element's mounting diameter and overall height and compare with the new part; (3) if the old element is gone, provide the model marking on the air filter housing and we will cross-check against the machine.

What else should be checked at the same time?
Intake hose and clamps (cracks, aging, looseness), housing sealing face, intake restriction indicator (does the needle return correctly), and the oil filter and separator element on the same interval. Bypass leakage is as harmful as running without a filter, so hose inspection is not optional.

Is this in stock and what is the lead time?
Regular stock items ship within 24 hours. Approximate transit: Southeast Asia 3–7 days, Middle East 7–10 days, Africa and Latin America 10–18 days, Russia/Belarus 10–15 days. Confirm against current stock and sailing schedules at the time of inquiry.

Is it a genuine part?
47742051001 is the Ingersoll Rand OEM part number. Always order by the part number itself — it is the only unambiguous identifier. Do not order based solely on "fits a 350 kW machine" or visual similarity.

Why are dimensions not listed?
This is a newer 11-digit part number, and no reliable published dimensional data is available. To avoid supplying an incorrect size, we do not publish estimated values. Measure the old element's outer diameter, mounting bore, and overall height before ordering, or contact us for cross-check assistance.

Compatible Machine

This element fits the MM model within the Ingersoll Rand SSR two-stage 350 kW platform.

• MM350-2S — 350 kW, 8.5 bar(g), 64.1 m³/min — the machine covered on this page

Other pressure ratings on the same platform, listed for identification and to help avoid mis-purchase:

• ML350-2S — 7.5 bar(g), 69.2 m³/min — low-pressure version
• MH350-2S — 10 bar(g), 59.5 m³/min — high-pressure version
• MXU350-2S — 14 bar(g), 50.2 m³/min — extra-high-pressure version

The SSR two-stage 350 kW platform uses integrated gear drive and digital control; typical machine dimensions are approximately 4000 × 1930 × 2146 mm with a net weight of about 7,600 kg, making it a large continuous-duty industrial unit. Filter configuration for other pressure ratings must be confirmed against the machine nameplate — this page makes no fitment claim for those models.

• This product corresponds to MM350-2S.
• If your machine is an ML350-2S, MH350-2S, or MXU350-2S, provide the nameplate model and we will verify the correct filter part number separately.
• If nameplate data is unclear, reading the part number on the old element is the most reliable confirmation.

Related Components

In the MM350-2S intake and lubrication system, the following items share the same service interval or should be inspected at the same time. For specific part numbers, refer to the parts manual supplied with the machine.

• Oil filter element — main oil circuit; removes wear debris and sludge, protecting the two-stage airend and bearings. Replace on the same interval as the air filter; check the housing seal face for weeping after replacement.
• Separator element — inside the separator tank; separates oil mist from compressed air and returns oil. Inspect the return line for blockage during replacement, as poor return flow directly raises oil carryover.
• Intake restriction indicator / intake vacuum alarm — on the filter housing or controller; the authoritative reference for replacement timing. Check needle return and sensing line condition; if failed, revert to a conservative interval.
• Intake hose and clamps — between the filter housing and airend intake; ensure no leakage or unfiltered-air bypass. Check for cracks, aging, and looseness — bypass leakage is as harmful as no filter.
• Housing sealing face and end cap — ensure reliable sealing once the element is compressed. Check for pitting, corrosion, or cap distortion.
• Lubricant — airend lubrication system; two-stage machines are demanding on oil quality. Test and change per machine requirements and avoid mixing grades.
• Air filters for other pressure ratings on the platform — part numbers for ML350-2S / MH350-2S / MXU350-2S. Distinguish by machine model when stocking or quoting; do not assume interchangeability by power rating.

Grouped replacement recommendation: on large two-stage machines, schedule the air filter, oil filter, and separator element in a single shutdown to avoid staggered intervals and repeated downtime. In dusty sites, add a high-dust pre-filter — pre-filter cost is far below the main element and replacement is faster.