1. Ahemman no gyinapɛn ahorow .
Imperial steel pipe no, ahenkurow "DN" no na ɛkyerɛ. Nkɛntɛnso ahorow bi ne DN15 (afiri a ne kɛse yɛ nsateakwaa 4), DN20 (afiri a ne kɛse yɛ nsateakwaa 6), DN25 (afiri a ne kɛse yɛ nsateakwaa 1), DN32 (afiri a ne kɛse yɛ nsateakwaa 1 a ne kɛse yɛ nsateakwaa 2), DN40 (afiri a ne kɛse yɛ nsateakwaa 1.5), DN50 (afiri a ne kɛse yɛ nsateakwaa 2), DN65 (2.5-inch paipu (4-inch pipe (afiri a ne kɛse yɛ nsateakwaa 5), DN150 (afiri a ne kɛse yɛ nsateakwaa 6), DN200 (afiri a ne kɛse yɛ nsateakwaa 8), ne DN250 (afiri a wɔde yɛ aduru a ne kɛse yɛ nsateakwaa 10). Sɛ nhwɛso no, DN25 (25 mm) nsu paipu ne Imperial 1-inch paipu, a wɔsan frɛ no 8-inch pipe a ɛwɔ Liberation Army no anim no yɛ pɛ. DN15 nsuo paipu ne ahemman 1/2-inch paipu, a wɔsan frɛ no 4-inch pipe a ɛwɔ Liberation Army no anim no yɛ pɛ. Sɛ nhwɛso no, DN20 nsu paipu yɛ 3/4" Britania gyinapɛn, a wɔsan frɛ no 6-inch pipe ansa na ahofadi kuw no aba.
2. Amanaman ntam gyinapɛn ahorow .
International standard steel pipe no gyina inch biako a wɔkyekyɛ mu nketenkete so. Nneɛma a ɛfa ho no bi ne nsateakwaa 1/8, 1/4, ne 3/8, a ɛne nsu afiri a wɔtaa frɛ no nsateakwaa 1 ne 7 yɛ pɛ. Wɔda ne kɛse nketewa adi sɛ 1/16, 1/32, ne 1/64, a ɛda so ara wɔ nsateakwaa mu. Sɛ wobetumi atew denominator ne numerator no so (sɛ nhwɛso no, numerator no yɛ 2, 4, 8, 16, anaa 32) a, ɛsɛ sɛ wɔtew so.
3. dade paipu kɛse ho akontaabu .
Mu duru akontabuo nsusuiɛ a ɛfa dadeɛ paipu ahodoɔ ho no gu ahodoɔ. Wɔ ase hɔ no, Miagoo de nsusuwii ahorow pii a wɔtaa bu ho akontaa a wɔtaa de bu akontaa no bɛba tiawa:
Dadeɛ a ɛyɛ kurukuruwa (kg)=0.00617 x diameter x diameter x tenten;
Square dadeɛ mu duru (kg)=0.00785 x afã tɛtrɛtɛ x afã tɛtrɛtɛ x tenten;
Dadeɛ mu duru a ɛyɛ tratraa (kg)=0.00785 x kɛseɛ x frame x tenten.