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1 09/97 CB-257

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LB161 LPG / NH3 Compressor This presentation is a simplified description of the disassembly of a Blackmer LB161. The current production model is the LB161B (August 1997). – PowerPoint PPT presentation

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Title: 1 09/97 CB-257


1
LB161 LPG / NH3 Compressor
This presentation is a simplified description of
the disassembly of a Blackmer LB161. The current
production model is the LB161B (August 1997).
The largest difference affecting disassembly is
in the oil pump. The current oil pump is self
reversing and is not shown in this
presentation Select one of the following
Hilites Only
Detailed Text
2
LB161 LPG / NH3 Compressor
3
LB161 LPG / NH3 Compressor
  • The LB161 compressor is suitable for many
    applications, but the most common is the transfer
    and vapor recovery of liquefied gases such as
    propane, butane, and anhydrous ammonia. The
    non-lubricated cylinder design of the LB161
    allows the transfer of these products without
    contamination of the products and is capable of
    transferring up to 90 gallons per minute (340
    lpm). Typically the LB161 is driven by a 5 or
    7.5 HP driver in the 650 to 800 rpm range.

4
LITERATURE
  • Be sure you have the proper literature before
    starting work on the compressor. Locate the
    parts list and Installation, Operation and
    Maintenance instructions. In addition, you may
    have received additional instruction sheets with
    your machine that further describe such items as
    valves and packing.
  • Literature is available on the web at
  • blackmercompressor.com
  • or from your Blackmer distributor.

5
Tools
  • The tools normally required for small machine
    service will be adequate. A small strap wrench
    is useful as well as a good spanner. The Blackmer
    spanner p/n 790316 has 1/4 pins and is used for
    piston removal. Blackmer wrench p/n 790535 may
    be used for the valve hold down screws. A flat
    scraper and inside snap ring pliers are also
    needed.
  • Blackmer offers a complete tool kit which has all
    of the hand tools necessary to dismantle the
    machine.
  • On larger machines a small hoist might be needed
    for one man to do the job, depending on the
    environment. Generally, two men can handle the
    disassembly of any Blackmer machine.

6
Nameplate
  • On the side of every Blackmer compressor is a
    nameplate which doubles as an access opening for
    inspecting the piston rod.
  • The nameplate will show the compressors model
    number, serial number, ID number, and oil
    capacity.
  • The compressor ID is a coded number that fully
    describes the compressors construction.
  • Make certain that you have these identifying
    numbers when you call your Blackmer distributor
    for parts or service assistance.

7
LB161 Compressor
  • Blackmer offers a variety of LPG transfer
    compressors.
  • The LB162 is similar to the LB161 shown in this
    presentation but has two seals separated by a
    distance piece on each piston rod.
  • Larger models are
  • LB361 / LB362 15 bhp (11 kw)
  • LB601 / LB602 40 bhp (30 kw)
  • LB942 50 bhp (37 kw)

8
Pressure Gauges
  • Blackmer compressors are typically fitted with a
    pressure gauge on both the suction and discharge.
    The gauges are fitted with a pulsation dampener
    to eliminate much of the vibration of the gauge
    needle making it easier to read and extending the
    life of the pressure gauge.
  • Both suction and discharge pressure gauges should
    be installed on every compressor.

9
Valve Caps and Hold Down Screws
  • Remove the valve caps to access the valves.
  • After the valve caps have been removed, the
    valve hold down screws can be removed with a
    spanner wrench (such as a Blackmer p/n 790316 or
    790535).
  • Note the O-ring under each cap these should be
    replaced rather than reused. Older models will
    have a metal gasket instead of an O-ring under
    the valve cap.

10
Valves
  • With the hold down screws removed, the valve
    post, valve and gasket may be taken out.
  • A liquid relief device in the suction valve post
    helps protect the compressor in case liquid
    enters the cylinder area. It consists of a ball
    and spring relief valve which will allow liquid
    to be returned to the suction piping if
    necessary.
  • The discharge valve is held in place by a solid
    post.
  • Make certain the valve gaskets are removed with
    each valve as they may be difficult to see in the
    head. The valve gaskets are normally aluminum
    and must be replaced when the valves are removed.

11
Cylinder Head
  • To remove the cylinder head, unbolt the two
    center head bolts from the top of the head and
    the four head bolts from the corners of the head.
    The two center head bolts have metal gaskets
    which are normally not reusable. After the
    cylinder head bolts have been removed, the head
    may be lifted from the cylinder.

12
Head O-rings and Piston Nut
  • The head is sealed to the cylinder with four
    O-rings (usually Buna-N). O-rings seal each
    cylinder and both center head bolts and are not
    normally reusable.
  • The piston nut is removed with an adjustable
    spanner. This spanner has two 1/4 pins which
    fit into holes in the top of the piston nut. Note
    the nylon locking device on the piston nut.

13
Piston Removal
  • Once the piston nut has been removed, the spanner
    is used to unscrew the piston from the rod.
    Under each piston is a thick washer and one, or
    more, shims. These shims adjust the height of
    the piston in the cylinder. This is referred to
    as the deck height. Unless a major part has
    been changed, the deck height should not need
    adjustment. Changing the piston, crosshead
    assembly, cylinder body, main bearings or
    crankshaft may require adjustment of the deck
    height.
  • Rotate the crankshaft to bring the other piston
    to top-dead-center for removal. Each piston is
    fitted with three piston rings. Each ring has a
    stainless steel expander between it and the
    piston. Install each piston ring with the bevel
    on the inside facing up. The ring and expander
    gaps should be staggered at 180 intervals during
    installation.

14
Cylinder
  • With the pistons removed, the cylinder can be
    unbolted and removed to gain access to the
    packing boxes. Two O-rings seal the bottom of the
    cylinder.
  • Notice the passage in the bottom of the cylinder
    between the bores. This allows gas to move from
    one cylinder to the other as the pistons move up
    and down.

15
Packing Box Removal
  • The packing boxes are secured by a hold down
    screw which is removed with the same adjustable
    spanner that was used on the piston nut and
    piston. Note that the hold down screw also has a
    nylon insert that keeps it in place.
  • The packing boxes may now be lifted off the rod.
    O-rings seal the bottom side of the packing boxes.

16
Packing Box disassembly
  • To remove the seals (packing) from the box
  • Remove the top snap ring with a pair of inside
    snap ring pliers. Depress the spring with a
    screwdriver handle to make this operation easier.

17
Rod Seals
  • With the snap ring removed, the top washer,
    spring, middle washer, seal rings, bottom washer
    and retainer ring can all be removed.
  • The seal consists of three types of rings. One
    ring is a male ring, next a series of V-rings,
    then a female ring.
  • On LB161 compressors, the spring and male ring
    will be at the top and the female ring will be at
    the bottom.

18
Piston Rod Inspection
  • The piston rods and the top on the crossheads are
    visible through the opening when the nameplate is
    removed.
  • The crosshead guide is secured to the crankcase
    by six bolts.

19
Crankcase and Crosshead
  • With the crosshead guide removed, the crosshead /
    piston rods are visible. The flat gasket on top
    of the crankcase may require the use of a flat
    scraper to remove completely.
  • The oil dipstick is located in the access cover.
    On current models, it is located adjacent to the
    access cover. The oil viscosity and capacity are
    found in the Instruction Manual.

20
Crosshead Connecting Rod Removal
  • Removal of the crankcase access cover and gasket
    permits access to the connecting rods. After the
    bottom cap of the connecting rod has been
    removed, the piston rod / crosshead and the top
    half of the connecting rod may be lifted off from
    above.

21
Crosshead and Connecting Rod
  • The connecting rod and crosshead assembly are
    separated by removing the wrist pin in a bench
    press. Note that the wrist pin has a plastic
    retainer plug on each end.
  • The piston rod is permanently secured to the
    crosshead at the factory and no attempt should be
    made to separate them. Final machining is done to
    the assembled crosshead / rod which precludes
    their reassembly once separated. The grooves in
    the crosshead are lubrication channels.
  • The small end of the connecting rod has a bronze
    bushing and is lubricated via and internal port
    running the length of the connecting rod.

22
Crosshead and Connecting Rod (contd)
  • A precision insert split shell bearing is located
    at the big journal end. Tabs on the bearing
    shells fit into slots in the rod and bearing cap.
    These retain the shells and align the oil feed
    holes.
  • The LB161 uses a bronze bushing on a steel wrist
    pin at the small end of the conrod. The oil
    admission hole in the bearing or bushing must
    align with the oil supply hole in the connecting
    rod small end. When the bronze wrist pin
    bushing is replaced, it must be honed to final
    dimension after being pressed into the connecting
    rod
  • The rod and cap are matched sets, do not mix.
    Match marks must align when assembling bearing
    cap to connecting rod.

23
Oil Pressure adjustment, Strainer
  • The oil pressure adjustment screw includes an
    O-ring, lock nut, spring and ball. Turn the
    screw inward (clockwise) to increase the oil
    pressure setting.
  • The oil pickup tube with washers, O-ring and
    strainer fits in the crankcase under the bearing
    carrier. If any foreign material is noticed in
    the strainer, its source should be quickly
    identified to prevent reoccurrence of the
    problem.
  • The pipe plug next to the oil pickup tube opening
    is the crankcase oil drain.
  • Some units will be fitted with an external oil
    filter (not shown).

24
Oil Pump
  • This photo shows the oil pump used in the LB161.
    The LB161B uses a different pump.
  • Remove the oil pump cover and O-ring to withdraw
    the oil pump. Notice the small O-ring on the
    pump shaft and the bronze bushing in the bearing
    carrier.
  • The oil pump cover can be installed with either
    left or right rotation arrow visible. When
    installing the cover, make sure that the arrow at
    the TOP of the cover indicates the desired
    rotation direction.

25
Bearing Carrier
  • The photo shows the bearing carrier / oil pump
    used in the LB161. The LB161B uses a different
    style.
  • The entire bearing carrier / oil pump assembly,
    with gasket, can be removed intact. This allows
    the crankshaft to be removed.
  • Note the slot in the end of the oil pump drive
    shaft. This slot must align with the drive tang
    in the end of the crankshaft during installation.

26
Crankshaft Removal
  • Remove the crosshead and connecting rod
    assemblies to proceed with the crankshaft
    removal. Notice the lubrication holes on the
    bearing journals. Also note the spray nozzles on
    the crankshaft. The spray nozzles lubricate the
    crosshead guide and the main roller bearings.
  • The top of the crankcase is fitted with a
    breather which prevents entry of foreign material
    into the crankcase but allows the release of
    crankcase pressure.

27
Bearing Cover Plate
  • The bearing cover plate is on the flywheel side
    of the crankcase. Behind this plate are a series
    of shims which adjust the preload on the main
    bearings. These shims are normally reusable and
    the shim thickness will not have to be adjusted
    unless the crankshaft and / or main bearings are
    replaced. The bearing cover plate also contains
    a crankshaft oil seal.

28
End ofPresentation
1809 Century Avenue Grand Rapids, MI, USA
49503 Ph 616-241-1611 Fax 616-241-3752 www.black
mer.com
29
LB161 LPG / NH3 Compressor
30
LB161 LPG / NH3 Compressor
  • Liquid transfer / vapor recovery of
  • propane
  • butane
  • anhydrous ammonia
  • Transfer without contamination
  • Up to 90 GPM
  • (340 lpm)
  • Usually driven by 5 or 7.5 HP driver at 650 to
    800 rpm

31
LITERATURE
  • Have the proper literature at hand
  • Parts lists
  • Installation, Operation and Maintenance manual
  • For literature
  • blackmercompressor.com
  • Call your Blackmer distributor

32
Tools
  • Use standard tools for small machines
  • Blackmer adjustable spanner with 1/4 pins (p/n
    790316)
  • Blackmer valve hold down screw wrench (790535)
  • Inside snap ring pliers
  • Blackmer tool kit available

33
Nameplate
  • Model number
  • Serial number
  • I.D. number
  • Defines construction
  • Oil capacity
  • Rod inspection access

34
LB161 Compressor
  • Other Models Available
  • LB162 double-seal
  • LB361 / LB36215 bhp (11 kw)
  • LB601 / LB60240 bhp (30 kw)
  • LB942 50 bhp (37 kw)

35
Pressure Gauges
  • Always install!
  • Suction Discharge
  • Pulsation dampener- extends gauge life makes it
    easier to read.

36
Valve Caps and Hold Down Screws
  • Cap O-ring (or metal gasket)
  • Screws are removed with spanner

37
Valves
  • Liquid relief device - ball spring
  • Post
  • Valves
  • Valve gaskets - usually aluminum
  • Always replace gaskets

38
Cylinder Head
  • Two center head bolts have metal gaskets

39
Head O-rings and Piston Nut
  • Head O-rings - not normally reusable
  • Remove piston nut with 1/4 pin spanner
  • Piston nut has nylon locking insert

40
Piston Removal
  • Use spanner to unscrew piston
  • Washer and shims adjust piston deck height
  • Piston rings have expanders
  • Bevel on inside of the ring faces up
  • Install rings and expanders with staggered gaps

41
Cylinder
  • Two O-rings seal the cylinder to the crankcase
  • Under-piston channel between bores

42
Packing Box Removal
  • Remove hold down screw with spanner
  • Hold down screw has nylon locking insert
  • O-rings seal bottom of packing box

43
Packing Box disassembly
  • Depress spring with screwdriver
  • Remove retainer ring with inside snap ring pliers

44
Rod Seals
  • Female packing ring on bottom
  • V - ring type
  • Male packing ring on top
  • Spring is on top of the packing

45
Piston Rod Inspection
  • Piston rods and tops of the crossheads are
    visible through the nameplate opening

46
Crankcase and Crossheads
  • Gasket between crankcase and guide
  • Oil level dipstick

47
Crosshead Connecting Rod Removal
  • Access cover and gasket
  • Remove lower bearing caps, lift crosshead and
    connecting rod assembly

48
Crosshead and Connecting Rod
  • Plastic retainer plugs
  • Connecting rod has cast-in oil channel, big end
    to small end
  • Connecting rod is Ductile Iron
  • Cast iron crosshead
  • Dont remove piston rod from crosshead

49
Crosshead and Connecting Rod (contd)
  • Wrist pin is pressed into the crosshead
  • Wrist pin bushing is pressed in and honed to the
    proper bore
  • Bushing oil hole must align with connecting rod
    feed hole
  • Split bearings on the crankend
  • Keep rod caps on the correct rod - use match marks

50
Oil Pressure adjustment, Strainer
  • Oil pressure adjustment screw and lock nut
  • Clean the oil strainer
  • Oil drain plug
  • External oil filter on some units

51
Oil Pump
  • May be installed for either rotation direction
  • The top arrow indicates rotation direction
  • Rotate cover 180 for opposite rotation direction

52
Bearing Carrier
  • Carrier and oil pump are removed as an assembly
  • Slot in carrier fits into tang at crankshaft end

53
Crankshaft Removal
  • Pressure lubrication holes at the journal
    bearings
  • Oil spray nozzles on the crankshaft for the
    crossheads
  • Crankcase breather vent

54
Bearing Cover Plate
  • Located at flywheel end
  • Shims adjust main bearing preload
  • Cover contains crankshaft oil seal

55
End ofPresentation
1809 Century Avenue Grand Rapids, MI, USA
49503 Ph 616-241-1611 Fax 616-241-3752 www.black
mer.com
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