Information
Threads
BSP
BSP thread form stands for British Standard Pipe and is common in Australia and the commonwealth countries. It is based on trade size rather than actual diameter which can lead to some confusion when measuring ports.
There are two types of BSP threads;- BSPP - Female & male thread are both (also known as G)- BSPT - Female thread is parallel and the male thread is tapered (also know as R/Rp) (the female thread can also be tapered it is then Rc, these are fairly rare to find). Within BSPT it is also common to call the female thread BSPP (parallel) and the male BSPT (tapered) even though they are both technically a BSPT thread form (the female would be parallel and the male would be tapered).
Both threads have the same pitch, angle (55 degrees) and shape (rounded peaks and valleys).
The below table gives the major and minor diameter for each BSP Trade Thread Size. The minor diameter may be ever so slightly smaller than what is in the table depending upon where it has been manufactured to in the thread gauge.
Trade Size
Threads per inch
Pitch
Major Diameter
Minor Diameter
Gage Length
Inch
mm
Inch
mm
Inch
Mm
Inch
mm
1/8
28
0.0357
0.907
0.383
9.728
0.3372
8.565
0.1563
3.97
1/4
19
0.0526
1.337
0.518
13.157
0.4506
11.445
0.2367
6.012
3/8
19
0.0526
1.337
0.656
16.662
0.5886
14.95
0.25
6.35
1/2
14
0.0714
1.814
0.825
20.955
0.7336
18.633
0.3214
8.164
3/4
14
0.0714
1.814
1.041
26.441
0.9496
24.12
0.375
9.525
1
11
0.0909
2.309
1.309
33.249
1.1926
30.292
0.4091
10.391
1 ¼
11
0.0909
2.309
1.65
41.91
1.5336
38.953
0.5
12.7
1 ½
11
0.0909
2.309
1.882
47.803
1.7656
44.846
0.5
12.7
2
11
0.0909
2.309
2.347
59.614
2.2306
56.657
0.625
15.875
2 ½
11
0.0909
2.309
2.96
75.184
2.8436
72.227
0.6875
17.463
3
11
0.0909
2.309
3.46
87.884
3.3436
84.927
0.8125
20.638
4
11
0.0909
2.309
4.45
113.03
4.3336
110.073
NPT
NPT stands for National Pipe Thread and is an American standard thread. It may also be reffered to as MPT , MNPT or NPT (M) for male external threads and FPT, FNPT or NPT(F) for female interal threads. A thread sealant must always be used to achieve a leak free seal (except for NPTF). It is also based on Trade Size rather than actual diameter (similar to BSP in this regard).
Both threads have the same pitch, angle (60 degrees) and shape (flat peaks and valleys).
The below table gives the Threads Per Inch, Pithc and Major Diameter for NPT Threads.
Trade Size
Threads per inch
Pitch
Major Diameter (O.D)
Inch
mm
Inch
mm
1/8
27
0.03704
0.94082
0.405
10.29
1/4
18
0.05556
1.41122
0.54
13.72
3/8
18
0.05556
1.41122
0.675
17.15
1/2
14
0.07143
1.81432
0.84
21.34
3/4
14
0.07143
1.81432
1.05
26.67
1
11 ½
0.08696
2.20878
1.315
33.4
1 ¼
11 ½
0.08696
2.20878
1.66
42.16
1 ½
11 ½
0.08696
2.20878
1.9
48.26
2
11 ½
0.08696
2.20878
2.375
60.33
2 ½
8
0.125
3.175
2.875
73.03
3
8
0.125
3.175
3.5
88.9
4
8
0.125
3.175
4.5
114.3
BSP vs NPT
NPT threads are common in the United States and a few other countries, BSP threads (also know as the R subset according to ISO 7) are widely used in many other countries.
BSPT -British Standard Pipe TaperBSPP -British Standard Pipe Parallel (G)NPT -National Pipe TaperNPS -National Pipe StraightR - External taper (ISO7)Rp - Internal Parallel (ISO7/1)Rc - Internal Taper (ISO 7)Rs - External ParallelWhile the actual specified outside diameters of American National Pipe differ slightly from those of British Standard Pipe, either thread may reliably be cut onto a pipe of its respective trade size. BSPT equivalent is NPT and BSPP’s equivalent is NPS.
Never swap threads if it is a high pressure application.
NPT/NPS and BSP threads are not compatible due to the differences in their thread forms, and not just the fact that most sizes have a different pitch. NPT/NPS threads have a 60° angle and have flattened peaks and valleys (Sellers thread form) where as BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form).
NPT and BSP thread pitches (threads per inch) are listed below. To determine pitch, use a thread gauge or count the number of threads that fall into a 1" span.
Trade Size
Pitch (Threads per Inch)
NPT/NPS
BSP
1/8
27
28
1/4
18
19
3/8
18
19
1/2
14
14
¾
14
14
1
11 ½
11
1 ¼
11 ½
11
1 ½
11 ½
11
2
11 ½
11
2 ½
8
11
3
8
11
3 ½
8
11
4
8
11
5
8
11
6
8
11
How to Measure Threads
To identify the trade size of the thread, first it must be determined whether the thread is tapered or parallel. This is done by measuring the first, fourth/fifth and last full thread. If the diameter increases from first thread to the last thread on a male thread or decreases from first to last thread on a female thread, then the thread is classified as a tapered thread (such as BSPT). If the diameter stays the same from the first to last thread then the thread is classified as a parallel thread (BSPP).
Once it is known whether the thread is parallel or tapered, it can be measured to determine it’s trade size. This trade size will not directly represent what is measured, ie. ½" BSP does not equal ½” measured.
For a parallel thread, any thread can be used to measure for its trade size, and for a tapered thread the fourth or fifth full thread is used. This measurement can then be referenced against a thread table to match it to its trade size.
Note: Dimensions may differ slightly between measurement and dimensions of the trade sizes due to variances in tolerances in measuring and manufacturing.
This information is product of Lifesaving Equipment. If you have any question or would like to use please email use info@lifesavingequipment.co.nz or click here
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Whether you're boating, swimming, or just enjoying a day by the water, safety should always be your top priority. Water activities can be a lot of fun, but they also come with risks that can be minimized with the right precautions. In this guide, we'll share essential water safety tips to help you and your loved ones stay safe while having a great time. # 1. Wear a Life Jacket: Don’t Leave Shore Without It Life jackets are essential for everyone on the water, regardless of age or swimming ability. Make sure each person on board has a properly fitting life jacket that meets safety standards. Even strong swimmers can face unexpected challenges, like strong currents or sudden weather changes. Wearing a life jacket significantly increases your chances of survival in an emergency. # 2. Know the Weather: Plan Ahead Before heading out on the water, always check the weather forecast. Sudden storms, high winds, and rough waters can turn a fun day into a dangerous situation. If the forecast looks uncertain, it's best to reschedule your plans. While on the water, keep an eye on the sky and be prepared to head back to shore if conditions start to change. # 3. Never Swim Alone: The Buddy System Swimming with a buddy is one of the simplest and most effective safety measures you can take. Whether you're at the beach, in a pool, or in a lake, always swim with a friend. In case of an emergency, having someone nearby can make all the difference. This rule is especially important for children, who should always be supervised by a responsible adult. # 4. Stay Sober: Alcohol and Water Don’t Mix Alcohol consumption is a major factor in many water-related accidents. It impairs judgment, balance, and reaction time, making it dangerous whether you're swimming, boating, or participating in water sports. To ensure your safety and the safety of others, avoid alcohol while on or near the water. # 5. Learn Basic Water Rescue Skills: Be Prepared to Help In an emergency, knowing how to perform basic water rescues can save lives. Enroll in a CPR and water safety course to learn these critical skills. If you see someone in trouble, call for help and try to assist from a safe distance, using a flotation device or extending a pole or rope. Avoid putting yourself at risk by jumping into the water unless you're trained in water rescue. # 6. Understand Rip Currents: Know How to React Rip currents are powerful, narrow channels of water that can pull swimmers out to sea. If you find yourself caught in a rip current, don’t panic. Swim parallel to the shore until you’re out of the current, then swim back to safety. Trying to fight the current by swimming directly to shore can exhaust you and lead to dangerous situations. Educate yourself and your family about rip currents before heading to the beach. # 7. Keep an Eye on the Kids: Constant Supervision Children can get into trouble quickly around water, so they require constant supervision. Designate a water watcher – an adult who is responsible for keeping an eye on the kids at all times. This person should avoid distractions like phones, reading, or alcohol while on duty. Remember, even shallow water can be dangerous for young children, so never leave them unattended. # 8. Use Sunscreen and Stay Hydrated: Protect Your Health Spending time in the sun and on the water increases your risk of sunburn and dehydration. Apply waterproof sunscreen with a high SPF at least 30 minutes before heading out, and reapply every two hours, especially after swimming or sweating. Drink plenty of water to stay hydrated, and take breaks in the shade to avoid heat exhaustion or sunstroke. # 9. Know Your Limits: Don’t Overestimate Your Abilities Whether you're swimming, boating, or participating in water sports, it's important to know your limits. Avoid venturing too far from shore, especially if you're not a strong swimmer. Don’t push yourself too hard or take unnecessary risks. It’s better to stay within your comfort zone and enjoy your time on the water safely. # 10. Equip Your Boat: Be Prepared for Emergencies If you're boating, ensure your vessel is equipped with all the necessary safety gear, including life jackets, a first-aid kit, a fire extinguisher, flares, and a working radio or communication device. Before setting off, inform someone on land about your plans and expected return time. Regularly maintain your boat to ensure it's in good working condition, and familiarize yourself with basic navigation and emergency procedures. Conclusion Water activities are a wonderful way to relax, have fun, and connect with nature. However, safety should always come first. By following these water safety tips, you can enjoy your time on the water while minimizing risks. Remember, a little preparation and awareness can go a long way in preventing accidents and ensuring that everyone has a safe and enjoyable experience.
The Ultimate Guide to Outboard Maintenance: Keep Your Engine Running Smoothly
Owning an outboard motor opens up a world of adventures on the water, but it also comes with the responsibility of proper maintenance. Regular upkeep not only ensures your motor’s longevity but also enhances performance and reliability. In this guide, we'll walk you through the essential steps for outboard maintenance to help you keep your engine in top shape.
# 1. Regular Inspection: Catch Problems Early
The first step in maintaining your outboard motor is a routine inspection. Before and after every trip, give your engine a once-over to check for any visible issues. Look for signs of wear, loose bolts, and corrosion. Inspect the propeller for any dents or damage that might affect performance. Catching problems early can save you from costly repairs down the line.
# 2. Change the Engine Oil: Keep It Running Smoothly
Just like with your car, regular oil changes are critical for your outboard motor. Depending on your engine, you'll need to change the oil every 50-100 hours of use or at least once a year. Always use high-quality marine-grade oil and follow the manufacturer’s guidelines. Don't forget to replace the oil filter as well!
# 3. Flush the Engine: Prevent Corrosion
Flushing your outboard engine after every use is vital, especially if you operate in saltwater. Salt, sand, and other debris can build up inside the cooling system, leading to corrosion and reduced performance. To flush the engine, connect it to a freshwater source using a flushing kit or muffs, and run the motor for about 10-15 minutes. This simple step can significantly extend your engine's lifespan.
# 4. Check and Replace the Spark Plugs: Ensure Reliable Ignition
Spark plugs play a crucial role in the performance of your outboard motor. Over time, they can become fouled or worn, leading to poor engine performance or difficulty starting. Inspect your spark plugs regularly and replace them if necessary. It's a good practice to keep a spare set on hand for quick replacements.
# 5. Inspect the Fuel System: Keep Fuel Flowing Smoothly
Your outboard motor relies on a clean and efficient fuel system to operate correctly. Regularly inspect the fuel lines, primer bulb, and fuel tank for signs of wear or leaks. Replace any damaged components immediately. Also, be sure to use fresh fuel and add a fuel stabilizer if you're storing the boat for an extended period. A clogged or dirty fuel filter should also be replaced to prevent engine issues.
# 6. Propeller Care: Optimize Performance
Your propeller is essential for optimal performance, so it deserves regular attention. Check the propeller for nicks, bends, or other damage that could affect your engine’s efficiency. If you notice any issues, consider repairing or replacing the propeller. Additionally, remove the propeller periodically to check for fishing line or other debris that may have wrapped around the prop shaft, which can cause serious damage if left unattended.
# 7. Gearcase Maintenance: Protect the Lower Unit
The gearcase, or lower unit, is a critical part of your outboard motor, housing the gears that drive the propeller. To keep it in good working condition, you should regularly check the gear oil for water intrusion, which indicates a seal failure. Change the gear oil at least once a year, and inspect the seals for wear. Replacing worn seals promptly can prevent costly repairs.
# 8. Battery Care: Ensure Reliable Starts
A well-maintained battery is essential for starting your outboard motor and powering your boat's electrical systems. Keep the battery terminals clean and free of corrosion, and ensure the battery is fully charged before heading out on the water. If your boat sits unused for an extended period, consider using a trickle charger to maintain the battery's charge.
# 9. Winterize Your Outboard: Protect It During the Off-Season
If you live in a region with cold winters, properly winterizing your outboard motor is essential. This involves draining the fuel system, changing the oil, flushing the engine, and applying a fogging oil to the cylinders to prevent corrosion. Additionally, store your outboard in a dry, cool place, and cover it to protect it from dust and moisture.
# 10. Follow the Manufacturer’s Guidelines: Stay on Track
Finally, always refer to your outboard motor’s manual for specific maintenance schedules and guidelines. Each engine model may have different requirements, and following the manufacturer’s recommendations will help you avoid potential issues and maintain your warranty.
Conclusion
By following these outboard maintenance tips, you can keep your engine running smoothly and reliably for years to come. Regular care and attention to detail will not only enhance your boating experience but also protect your investment. Remember, a well-maintained outboard motor is key to enjoying worry-free days on the water.