Hoerbiger Oil Wiper Packing

The OT oilwiper packing: oil tight

A new solution for a common problem: oil leakage Why do conventional oil wiper packings often leak, leading to high crosshead lubricant consumption?

The most common reasons for leaking oil wiper packings: ■

Old machines with worn rods and housings

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Increased crankcase oil splash due to old machines worn bearings

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Poor crankcase and cross-head design with excessive oil splash

■

Poor wiper housing design with insufficient oil drainage

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Crankcase pressurisation and pressure pulsations

■

Poor wiper ring quality

Conventional design

OT design

■

Poor conformability of ring to rod,

The majority of oil leakage is over the

The volume of oil entering the housing

ring contact pressure

top of the wiper rings. This occurs due

is minimised by the nonmetallic throttle

Incorrect ring side clearance leading

to the strong garter springs which cause

ring sticking to the front face of the

to rings pumping or jamming

the wiper rings to grip the piston rod

wiper housing through “oil sticktion”.

■

Incorrect wiper ring design

and reciprocate with the rod. Therefore

Combined with this the OT wiper rings

■

Rod dynamics, rod run-out and

large amounts of oil are pumped into

are designed to have a much smaller

excessive vibrations

the housing. Conventional wiper rings do

radial height than conventional rings

not conform to the piston rod due to the

allowing the rings to conform to the

typically large radial height of metallic

piston rod ensuring optimal scraping of

Good performance of non-lube

material, hence the rings can not scrape

the oil from the piston rod surface.

pressure packings, especially for

oil efficiently.

■

An efficient seal means: ■

processes that must be totally oil-free ■

Greater reliability and reduced machine shutdowns

■

Substantial cost savings due to reduction in oil recycling

A new design providing far greater efficiency, leading to lower crankcase oil consumption HOERBIGER’s answer: OT oil wiper packing utilises the effect of oil viscosity to stick the throttle ring to the container. The new design enables optimum rod conformability even when the rod is tapered or out-of-round.

Oil sticktion

OT design adapts to

Prevents the majority of oil from

any piston rod

entering the housing, limiting

Reduced stiffness of ring

the volume of oil that the oil

sections allow conformability

wiper rings should scrape.

to piston rod

Efficient wiper edges

Easily retrofitted

Single scraping edge designed

To existing housings

to provide optimum scraping performance. Extremely simple to assemble Increased reliability

Due to 2 piece design

Results in reduction of machine shutdowns. HY material All non-metallic rings Essential cost savings

manufactured from special

Through considerable

HY material

reduction in purchase, disposal and recycle costs.

Environmentally friendly Reduction in volume of oil disposal.

Registered trademark

The advantages of the OT oil wiper packing at a glance ✔

Very efficient seal – zero or minimal oil leakage, especially for processes where oil free service is required

✔

The OT design offers the greatest potential to conform to out-of-round piston rods

✔

Easily fitted to existing housings

✔

2 piece design makes assembly simple

✔

Cost reduction due to oil savings

✔

Reduction of disposal and recycling of oil

✔

Environmentally friendly due to reduced volume of disposal

✔

Solves leakage problems on all configurations of compressor

The application range

■

Not process specific: applicable for all services

■

Rod diameters range from 13 mm up to 250 mm

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Suitable for new and existing compressors

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Suitable for all compressor configurations (horizontal, vertical, “V” and “W” etc)

■

all RPM’s

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OT wiper rings can be manufactured in various materials, standard material being bronze but this can be changed for sour gas applications e.g. where H2S is present

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Already installed in more than 200 different compressor models        F        0        2        G        A        D        1        3        E        1        1        8        U        1        A

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